Library Functions Manual

NAME¶

dialog - widgets and utilities for the dialog program

SYNOPSIS¶

cc [ flag ... ] file ... -ldialog [ library ... ]
or
cc $(dialog-config --cflags) file ... $(dialog-config --libs) ]

#include <dialog.h>

Dialog is a program that will let you present a variety of questions or display messages using dialog boxes from a shell script. It is built from the dialog library, which consists of several widgets as well as utility functions that are used by the widgets or the main program.

DESCRIPTION¶

This manpage documents the features from <dialog.h> which are likely to be important to developers using the widgets directly. Some hints are also given for developing new widgets.

Here is a dialog version of Hello World:

int main(void)
{
	int status;
	init_dialog(stdin, stdout);
	status = dialog_yesno(
			"Hello, in dialog-format",
			"Hello World!",
			0, 0);
	end_dialog();
	return status;
}

DEFINITIONS¶

Exit codes (passed back to the main program for its use) are defined with a "DLG_EXIT_ prefix. The efined constants can be mapped using environment variables as described in dialog(1), e.g., DLG_EXIT_OK corresponds to $DIALOG_OK.

Useful character constants which correspond to user input are named with the "CHR_" prefix, e.g., CHR_BACKSPACE.

Colors and video attributes are categorized and associated with settings in the configuration file (see the discussion of $DIALOGRC in dialog(1)). The DIALOG_ATR(n) macro is used for defining the references to the combined color and attribute table dlg_color_table[].

The dialog application passes its command-line parameters to the widget functions. Some of those parameters are single values, but some of the widgets accept data as an array of values. Those include checklist/radiobox, menubox and formbox. When the --item-help option is given, an extra column of data is expected. The USE_ITEM_HELP(), CHECKBOX_TAGS, MENUBOX_TAGS and FORMBOX_TAGS macros are used to hide this difference from the calling application.

Most of the other definitions found in <dialog.h> are used for convenience in building the library or main program. These include definitions based on the generated <dlg_config.h> header.

DATA STRUCTURES¶

All of the global data for the dialog library is stored in a few structures: DIALOG_STATE, DIALOG_VARS and DIALOG_COLORS. The corresponding dialog_state, dialog_vars and dlg_color_table global variables should be initialized to zeros, and then populated with the data to use. A few of these must be nonzero for the corresponding widgets to function. As as the case with function names, variables beginning with "dialog_" are designed for use by the calling application while variables beginning with "dlg_" are intended for lower levels, e.g., by the dialog library.

DIALOG_STATE¶

The state variables are dialog's working variables. It initializes those, uses them to manage the widgets.

.all_subwindows¶

This is a linked list of all subwindows created by the library. The dlg_del_window function uses this to free storage for subwindows when deleting a window.

.all_windows¶

This is a linked list of all windows created by the library. The dlg_del_window function uses this to locate windows which may be redrawn after deleting a window.

.aspect_ratio¶

This corresponds to the command-line option "--aspect-ratio". The value gives the application some control over the box dimensions when using auto sizing (specifying 0 for height and width). It represents width / height. The default is 9, which means 9 characters wide to every 1 line high.

.finish_string¶

When set to true, this allows calls to dlg_finish_string to discard the corresponding data which is created to speed up layout computations for the given string parameter. The gauge widget uses this feature.

.getc_callbacks¶

This is set up in ui_getc.c to record windows which must be polled for input, e.g., to handle the background tailbox widget. One window is designated as the foreground or control window.

.getc_redirect¶

If the control window for DIALOG_STATE.getc_callbacks is closed, the list is transferred to this variable. Closing all windows causes the application to exit.

.had_resize¶

This is set to TRUE in dlg_will_resize or dlg_result_key when KEY_RESIZE is read, to tell dialog to ignore subsequent ERRs.

.no_mouse¶

This corresponds to the command-line option "--no-mouse". If true, dialog will not initialize (and enable) the mouse in init_dialog.

.output¶

This is set in the dialog application to the stream on which the application and library functions may write text results. Normally that is the standard error, since the curses library prefers to write its data to the standard output. Some scripts, trading portability for convenience, prefer to write results to the standard output, e.g., by using the "--stdout" option.

.output_count¶

This is incremented by dlg_does_output, which is called by each widget that writes text to the output. The dialog application uses that to decide if it should also write a separator, i.e., DIALOG_STATE.separate_str, between calls to each widget.

.pipe_input¶

This is set in init_dialog to a stream which can be used by the gauge widget, which must be the application's standard input. The dialog application calls init_dialog normally with input set to the standard input, but optionally based on the "--input-fd" option. Since the application cannot read from a pipe (standard input) and at the same time read the curses input from the standard input, it must allow for reopening the latter from either a specific file descriptor, or directly from the terminal. The adjusted pipe stream value is stored in this variable.

.screen_height¶

The text-formatting functions use this for the number of rows used for formatting a string.

It is used by dialog for the command-line options "--print-text-size" and "--print-text-only".

.screen_initialized¶

This is set in init_dialog and reset in end_dialog. It is used to check if curses has been initialized, and if the endwin function must be called on exit.

.screen_output¶

This is set in init_dialog to the output stream used by the curses library. Normally that is the standard output, unless that happens to not be a terminal (and if init_dialog can successfully open the terminal directly).

.screen_width¶

The text-formatting functions use this for the number of columns used for formatting a string.

It is used by dialog for the command-line options "--print-text-size" and "--print-text-only".

.separate_str¶

This corresponds to the command-line option "--separate-widget". The given string specifies a string that will separate the output on dialog's output from each widget. This is used to simplify parsing the result of a dialog with several widgets. If this option is not given, the default separator string is a tab character.

.tab_len¶

This corresponds to the command-line option "--tab-len number". Specify the number of spaces that a tab character occupies if the "--tab-correct" option is given. The default is 8.

.text_height¶

The text-formatting functions set this to the number of lines used for formatting a string.

It is used by dialog for the command-line options "--print-text-size" and "--print-text-only".

.text_only¶

Dialog uses this in the command-line option "--print-text-only".

The text-formatting functions (dlg_print_text, dlg_print_line, and dlg_print_autowrap) check this to decide whether to print the formatted text to dialog's output or to the curses-display.

Also, dlg_auto_size checks the flag, allowing it to be used before init_dialog is called.

.text_width¶

The text-formatting functions set this to the number of columns used for formatting a string.

It is used by dialog for the command-line options "--print-text-size" and "--print-text-only".

.trace_output¶

This corresponds to the command-line option "--trace file". It is the file pointer to which trace messages are written.

.use_colors¶

This is set in init_dialog if the curses implementation supports color.

.use_scrollbar¶

This corresponds to the command-line option "--scrollbar". If true, draw a scrollbar to make windows holding scrolled data more readable.

.use_shadow¶

This corresponds to the command-line option "--no-shadow". This is set in init_dialog if the curses implementation supports color. If true, suppress shadows that would be drawn to the right and bottom of each dialog box.

.visit_items¶

This corresponds to the command-line option "--visit-items". Modify the tab-traversal of the list-oriented widgets (buildlist, checklist, radiobox, menubox, inputmenu, and treeview) to include the list of items as one of the states. This is useful as a visual aid, i.e., the cursor position helps some users.

The dialog application resets the dialog_vars data before accepting options to invoke each widget. Most of the DIALOG_VARS members are set directly from dialog's command-line options:

DIALOG_VARS¶

In contrast to DIALOG_STATE, the members of DIALOG_VARS are set by command-line options in dialog.

.ascii_lines¶

This corresponds to the command-line option "--ascii-lines. It causes line-drawing to be done with ASCII characters, e.g., "+" and "-". See DIALOG_VARS.no_lines.

.backtitle¶

This corresponds to the command-line option "--backtitle backtitle". It specifies a backtitle string to be displayed on the backdrop, at the top of the screen.

.beep_after_signal¶

This corresponds to the command-line option "--beep-after". If true, beep after a user has completed a widget by pressing one of the buttons.

.beep_signal¶

This corresponds to the command-line option "--beep". It is obsolete.

.begin_set¶

This is true if the command-line option "--begin y x" was used. It specifies the position of the upper left corner of a dialog box on the screen.

.begin_x¶

This corresponds to the x value from the command-line option "--begin y x" (second value).

.begin_y¶

This corresponds to the y value from the command-line option "--begin y x" (first value).

.cancel_label¶

This corresponds to the command-line option "--cancel-label string". The given string overrides the label used for “Cancel” buttons.

.cant_kill¶

This corresponds to the command-line option "--no-kill". If true, this tells dialog to put the tailboxbg box in the background, printing its process id to dialog's output. SIGHUP is disabled for the background process.

.colors¶

This corresponds to the command-line option "--colors". If true, interpret embedded "\Z" sequences in the dialog text by the following character, which tells dialog to set colors or video attributes:

0 through 7 are the ANSI codes used in curses: black, red, green, yellow, blue, magenta, cyan and white respectively.
Bold is set by 'b', reset by 'B'.
Reverse is set by 'r', reset by 'R'.
Underline is set by 'u', reset by 'U'.

The settings are cumulative, e.g., "\Zb\Z1" makes the following text bright red. Restore normal settings with "\Zn".

.column_separator¶

This corresponds to the command-line option "--column-separator". Dialog splits data for radio/checkboxes and menus on the occurrences of the given string, and aligns the split data into columns.

.cr_wrap¶

This corresponds to the command-line option "--cr-wrap". If true, interpret embedded newlines in the dialog text as a newline on the screen. Otherwise, dialog will only wrap lines where needed to fit inside the text box. Even though you can control line breaks with this, dialog will still wrap any lines that are too long for the width of the box. Without cr-wrap, the layout of your text may be formatted to look nice in the source code of your script without affecting the way it will look in the dialog.

.cursor_off_label¶

This corresponds to the command-line option "--cursor-off-label". If true, place the terminal cursor at the end of a button instead of on the first character of the button label. This is useful to reduce visual confusion when the cursor coloration interacts poorly with the button-label text colors.

.date_format¶

This corresponds to the command-line option "--date-format string". If the host provides strftime, and the value is nonnull, the calendar widget uses this to format its output.

.default_button¶

This is set by the command-line option "--default-button. It is used by dlg_default_button.

.default_item¶

This corresponds to the command-line option "--default-item string". The given string is used as the default item in a checklist, form or menu box. Normally the first item in the box is the default.

.defaultno¶

This corresponds to the command-line option "--defaultno". If true, make the default value of the yes/no box a No. Likewise, treat the default button of widgets that provide “OK” and “Cancel” as a Cancel. If --no-cancel was given that option overrides this, making the default button always “Yes” (internally the same as “OK”).

.dlg_clear_screen¶

This corresponds to the command-line option "--clear". This option is implemented in the main program, not the library. If true, the screen will be cleared on exit. This may be used alone, without other options.

.erase_on_exit¶

This corresponds to the command-line option "--erase-on-exit". If true, remove the dialog widget on program exit, erasing the entire screen to its native background color, and place the terminal cursor at the lower left corner of the screen.

This is useful for making the window contents invisible at the end of a series of dialog boxes. It can also be used at earlier stages of a series of invocations of dialog, if the series may be aborted before it is fully completed.

.exit_label¶

This corresponds to the command-line option "--exit-label string". The given string overrides the label used for “EXIT” buttons.

.extra_button¶

This corresponds to the command-line option "--extra-button". If true, some widgets show an extra button, between “OK” and “Cancel” buttons, or “Yes” and “No” buttons.

.extra_label¶

This corresponds to the command-line option "--extra-label string". The given string overrides the label used for “Extra” buttons. Note: for inputmenu widgets, this defaults to “Rename”.

.formitem_type¶

This is set by the command-line option "--passwordform" to tell the form widget that its text fields should be treated like password widgets.

.help_button¶

This corresponds to the command-line option "--help-button". If true, some widgets show a help-button after “OK” and “Cancel” buttons, i.e., in checklist, radiolist and menu boxes, or the “Yes” and “No” buttons for the yesno box.

If --item-help is also given, on exit the return status will be the same as for the “OK” button, and the item-help text will be written to dialog's output after the token “HELP”. Otherwise, the return status will indicate that the Help button was pressed, and no message printed.

.help_file¶

This corresponds to the command-line option "--hfile string". The given filename is passed to dialog_helpfile when the user presses F1.

.help_label¶

This corresponds to the command-line option "--help-label string". The given string overrides the label used for “Help” buttons.

.help_line¶

This corresponds to the command-line option "--hline string". The given string is displayed in the bottom of dialog windows, like a subtitle.

.help_status¶

This corresponds to the command-line option "--help-status". If true, and the the help-button is selected, writes the checklist or radiolist information after the item-help “HELP” information. This can be used to reconstruct the state of a checklist after processing the help request.

.help_tags¶

This corresponds to the command-line option "--help-tags". If true, dlg_add_help_formitem and dlg_add_help_listitem use the item's tag value consistently rather than using the tag's help-text value when DIALOG_VARS.item_help is set.

.input_length¶

This is nonzero if DIALOG_VARS.input_result is allocated, versus being a pointer to the user's local variables.

.input_menu¶

This flag is set to denote whether the menubox widget implements a menu versus a inputmenu widget.

.input_result¶

This may be either a user-supplied buffer, or a buffer dynamically allocated by the library, depending on DIALOG_VARS.input_length:

If DIALOG_VARS.input_length is zero, this is a pointer to user buffer (on the stack, or static). The buffer size is assumed to be MAX_LEN, which is defined in <dialog.h>.
When DIALOG_VARS.input_length is nonzero, this is a dynamically-allocated buffer used by the widgets to return printable results to the calling application.

Certain widgets copy a result to this buffer. If the pointer is NULL, or if the length is insufficient for the result, then the dialog library allocates a buffer which is large enough, and sets DIALOG_VARS.input_length. Callers should check for this case if they have supplied their own buffer.

.insecure¶

This corresponds to the command-line option "--insecure". If true, make the password widget friendlier but less secure, by echoing asterisks for each character.

.in_helpfile¶

This variable is used to prevent dialog_helpfile from showing anything, e.g., if F1 were pressed within a help-file display.

.iso_week¶

This corresponds to the command-line option "--iso-week". It is used in the calendar widget to tell how to compute the starting week for the year:

by default, the calendar treats January 1 as the first week of the year.
If this variable is true, the calendar uses ISO 8601's convention. ISO 8601 numbers weeks starting with the first week in January with a Thursday in the current year. January 1 may be in the previous year.

.item_help¶

This corresponds to the command-line option "--item-help". If true, interpret the tags data for checklist, radiolist and menu boxes adding a column whose text is displayed in the bottom line of the screen, for the currently selected item.

.keep_tite¶

This is set by the command-line option "--keep-tite" to tell dialog to not attempt to cancel the terminal initialization (termcap ti/te) sequences which correspond to xterm's alternate-screen switching. Normally dialog does this to avoid flickering when run several times in a script.

.keep_window¶

This corresponds to the command-line option "--keep-window". If true, do not remove/repaint the window on exit. This is useful for keeping the window contents visible when several widgets are run in the same process. Note that curses will clear the screen when starting a new process.

.last_key¶

This corresponds to the command-line option "--last-key".

.max_input¶

This corresponds to the command-line option "--max-input size". Limit input strings to the given size. If not specified, the limit is 2048.

.no_hot_key¶

This corresponds to the command-line option "--no-hot-list".

Some widgets (buildlist, checklist, inputmenu, menu, radiolist, treeview) display a list for which the leading capital letter in each entry is accepted as a hot-key, to quickly move the focus to that entry.

Setting this variable to TRUE disables the feature.

.no_items¶

This corresponds to the command-line option "--no-items". Some widgets (checklist, inputmenu, radiolist, menu) display a list with two columns (a “tag” and “item”, i.e., “description”). This tells dialog to read shorter rows from data, omitting the “list”.

.no_label¶

This corresponds to the command-line option "--no-label string". The given string overrides the label used for “No” buttons.

.no_lines¶

This corresponds to the command-line option "--no-lines. It suppresses line-drawing. See DIALOG_VARS.ascii_lines.

.no_nl_expand¶

This corresponds to the command-line option "--no-nl-expand". If false, dlg_trim_string converts literal "\n" substrings in a message into newlines.

.no_tags¶

This corresponds to the command-line option "--no-tags". Some widgets (checklist, inputmenu, radiolist, menu) display a list with two columns (a “tag” and “item”, also known as “description”). The tag is useful for scripting, but may not help the user. The --no-tags option (from Xdialog) may be used to suppress the column of tags from the display.

Normally dialog allows you to quickly move to entries on the displayed list, by matching a single character to the first character of the tag. When the --no-tags option is given, dialog matches against the first character of the description. In either case, the matchable character is highlighted.

Here is a table showing how the no_tags and no_items values interact:

Widget	Fields Shown	Fields Read	.no_items	.no_tags
buildlist	item	tag,item	0	0*
buildlist	item	tag,item	0	1
buildlist	tag	tag	1	0*
buildlist	tag	tag	1	1
checklist	tag,item	tag,item	0	0
checklist	item	tag,item	0	1
checklist	tag	tag	1	0
checklist	tag	tag	1	1
inputmenu	tag,item	tag,item	0	0
inputmenu	item	tag,item	0	1
inputmenu	tag	tag	1	0
inputmenu	tag	tag	1	1
menu	tag,item	tag,item	0	0
menu	item	tag,item	0	1
menu	tag	tag	1	0
menu	tag	tag	1	1
radiolist	tag,item	tag,item	0	0
radiolist	item	tag,item	0	1
radiolist	tag	tag	1	0
radiolist	tag	tag	1	1
treeview	item	tag,item	0	0*
treeview	item	tag,item	0	1
treeview	tag	tag	1	0*
treeview	tag	tag	1	1

*: Xdialog does not display the tag column for the analogous buildlist and treeview widgets. Dialog does the same on the command-line. However the library interface defaults to displaying the tag column. Your application can enable or disable the tag column as needed for each widget.

.nocancel¶

This corresponds to the command-line option "--no-cancel". If true, suppress the “Cancel” button in checklist, inputbox and menu box modes. A script can still test if the user pressed the ESC key to cancel to quit.

.nocollapse¶

This corresponds to the command-line option "--no-collapse". Normally dialog converts tabs to spaces and reduces multiple spaces to a single space for text which is displayed in a message boxes, etc. It true, that feature is disabled. Note that dialog will still wrap text, subject to the --cr-wrap option.

.nook¶

This corresponds to the command-line option "--no-ok. Dialog will suppress the “ok” (or “yes”) button from the widget.

.ok_label¶

This corresponds to the command-line option "--ok-label string". The given string overrides the label used for “OK” buttons.

.pause_secs¶

When set, force dlg_set_timeout to use 10 milliseconds rather than using the DIALOG_VARS.timeout_secs value.

.print_siz¶

This corresponds to the command-line option "--print-size". If true, each widget prints its size to dialog's output when it is invoked.

.quoted¶

This corresponds to the command-line option "--quoted. Normally dialog quotes the strings returned by checklist's as well as the item-help text. If true, dialog will quote all string results.

.reorder¶

This corresponds to the command-line option "--reorder. By default, the buildlist widget uses the same order for the output (right) list as for the input (left). If true, dialog will use the order in which a user adds selections to the output list.

.separate_output¶

This corresponds to the command-line option "--separate-output". If true, checklist widgets output result one line at a time, with no quoting. This facilitates parsing by another program.

.single_quoted¶

This corresponds to the command-line option "--single-quoted". If true, use single-quoting as needed (and no quotes if unneeded) for the output of checklist's as well as the item-help text. If this option is not set, dialog uses double quotes around each item. The latter requires occasional use of backslashes to make the output useful in shell scripts.

.size_err¶

This corresponds to the command-line option "--size-err". If true, check the resulting size of a dialog box before trying to use it, printing the resulting size if it is larger than the screen. (This option is obsolete, since all new-window calls are checked).

.sleep_secs¶

This corresponds to the command-line option "--sleep secs". This option is implemented in the main program, not the library. If nonzero, this is the number of seconds after to delay after processing a dialog box.

.tab_correct¶

This corresponds to the command-line option "--tab-correct". If true, convert each tab character of the text to one or more spaces. Otherwise, tabs are rendered according to the curses library's interpretation.

.time_format¶

This corresponds to the command-line option "--time-format string". If the host provides strftime, and the value is nonnull, the timebox widget uses this to format its output.

.timeout_secs¶

This corresponds to the command-line option "--timeout secs". If nonzero, timeout input requests (exit with error code) if no user response within the given number of seconds.

.title¶

This corresponds to the command-line option "--title title". Specifies a title string to be displayed at the top of the dialog box.

.trim_whitespace¶

This corresponds to the command-line option "--trim". If true, eliminate leading blanks, trim literal newlines and repeated blanks from message text.

.week_start¶

This corresponds to the command-line option "--week-start". It is used in the calendar widget to set the starting day for the week. The string value can be

a number (0 to 6, Sunday through Saturday using POSIX) or
the special value “locale” (this works with systems using glibc, providing an extension to the locale command, the first_weekday value).
a string matching one of the abbreviations for the day of the week shown in the calendar widget, e.g., “Mo” for “Monday”.

.yes_label¶

This corresponds to the command-line option "--yes-label string". The given string overrides the label used for “Yes” buttons.

WIDGETS¶

Functions that implement major functionality for the command-line dialog program, e.g., widgets, have names beginning "dialog_".

All dialog boxes have at least three parameters:

title: the caption for the box, shown on its top border.
height: the height of the dialog box.
width: the width of the dialog box.

Other parameters depend on the box type.

dialog_buildlist¶

implements the "--buildlist" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int list_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
char ** items: is an array of strings which is viewed either as a list of rows

tag item status

: or

tag item status help

: depending on whether dialog_vars.item_help is set.

int order_mode: is reserved for future enhancements

dialog_calendar¶

implements the "--calendar" option.

const char * title: is the title on the top of the widget.
const char * subtitle: is the prompt text shown within the widget.
int height: is the height excluding the fixed-height calendar grid.
int width: is the overall width of the box, which is adjusted up to the calendar grid's minimum width if needed.
int day: is the initial day of the week shown, counting zero as Sunday. If the value is negative, the current day of the week is used.
int month: is the initial month of the year shown, counting one as January. If the value is negative, the current month of the year is used.
int year: is the initial year shown. If the value is negative, the current year is used.

dialog_checklist¶

implements the "--checklist" and "--radiolist" options depending on the flag parameter.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int list_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
int items: is an array of strings which is viewed either as a list of rows

tag item status

: or

tag item status help

: depending on whether dialog_vars.item_help is set.
flag: is either FLAG_CHECK, for checklists, or FLAG_RADIO for radiolists.

dialog_dselect¶

implements the "--dselect" option.

const char * title: is the title on the top of the widget.
const char * path: is the preselected value to show in the input-box, which is used also to set the directory- and file-windows.
int height: is the height excluding the minimum needed to show the dialog box framework. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.

dialog_editbox¶

implements the "--editbox" option.

const char * title: is the title on the top of the widget.
const char * file: is the name of the file from which to read.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.

dialog_form¶

implements the "--form" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int form_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
int items: is an array of strings which is viewed either as a list of rows

Name NameY NameX Text TextY TextX FLen ILen

: or

Name NameY NameX Text TextY TextX FLen ILen Help

: depending on whether dialog_vars.item_help is set.

dialog_fselect¶

implements the "--fselect" option.

const char * title: is the title on the top of the widget.
const char * path: is the preselected value to show in the input-box, which is used also to set the directory- and file-windows.
int height: is the height excluding the minimum needed to show the dialog box framework. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.

dialog_gauge¶

implements the "--gauge" option. Alternatively, a simpler or customized gauge widget can be set up using dlg_allocate_gauge, dlg_reallocate_gauge, dlg_update_gauge and dlg_free_gauge.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int percent: is the percentage to show in the progress bar.

dialog_inputbox¶

implements the "--inputbox" or "--password" option, depending on the value of password.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
const char * init: is the initial value of the input box, whose length is taken into account when auto-sizing the width of the dialog box.
int password: if true, causes typed input to be echoed as asterisks.

dialog_helpfile¶

implements the "--hfile" option.

const char * title: is the title on the top of the widget.
const char * file: is the name of a file containing the text to display. This function is internally bound to F1 (function key “1”), passing dialog_vars.help_file as a parameter. The dialog program sets that variable when the --hfile option is given.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.

dialog_menu¶

implements the "--menu" or "--inputmenu" option depending on whether dialog_vars.input_menu is set.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int menu_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
int items: is an array of strings which is viewed either as a list of rows

tag item

: or

tag item help

: depending on whether dialog_vars.item_help is set.

dialog_mixedform¶

implements the "--mixedform" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int form_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
int items: is an array of strings which is viewed either as a list of rows

Name NameY NameX Text TextY TextX FLen ILen Ityp

: or

Name NameY NameX Text TextY TextX FLen ILen Ityp Help

: depending on whether dialog_vars.item_help is set.

dialog_mixedgauge¶

implements the "--mixedgauge" option

const char * title: is the title on the top of the widget.
const char * cprompt: is the caption text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int percent: is the percentage to show in the progress bar.
int item_no: is the number of rows in items.
int items: is an array of strings which is viewed as a list of tag and item values. The tag values are listed, one per row, in the list at the top of the widget.

: The item values are decoded: digits 0 through 9 are the following strings

0: Succeeded
1: Failed
2: Passed
3: Completed
4: Checked
5: Done
6: Skipped
7: In Progress
8: (blank)
9: N/A

: A string with a leading "-" character is centered, marked with "%". For example, "-75" is displayed as "75%". Other strings are displayed as is.

dialog_msgbox¶

implements the "--msgbox" or "--infobox" option depending on whether pauseopt is set.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int pauseopt: if true, an “OK” button will be shown, and the dialog will wait for it to complete. With an “OK” button, it is denoted a “msgbox”, without an “OK” button, it is denoted an “infobox”.

dialog_pause¶

implements the "--pause" option.

const char * title: is the title on the top of the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int seconds: is the timeout to use for the progress bar.

dialog_prgbox¶

implements the "--prgbox" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget. If empty or null, no prompt is shown.
const char * command: is the name of the command to execute.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int pauseopt: if true, an “OK” button will be shown, and the dialog will wait for it to complete.

dialog_progressbox¶

implements the "--progressbox" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget. If empty or null, no prompt is shown.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.

dialog_rangebox¶

implements the "--rangebox" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget. If empty or null, no prompt is shown.
int height: is the desired height of the widget. If zero, the height is based on the screen size.
int width: is the desired width of the widget. If zero, the height is based on the screen size.
int min_value: is the minimum value to allow.
int max_value: is the maximum value to allow.
int default_value: is the default value, if no change is made.

dialog_tailbox¶

implements the "--tailbox" or "--tailboxbg" option depending on whether bg_task is set.

const char * title: is the title on the top of the widget.
const char * file: is the name of the file to display in the dialog.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int bg_task: if true, the window is added to the callback list in dialog_state, and the application will poll for the window to be updated. Otherwise an “OK” button is added to the window, and it will be closed when the button is activated.

dialog_textbox¶

implements the "--textbox" option.

const char * title: is the title on the top of the widget.
const char * file: is the name of the file to display in the dialog.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.

dialog_timebox¶

implements the "--timebox" option. See dlg_auto_size for layout using height and width parameters.

const char * title: is the title on the top of the widget.
const char * subtitle: is the prompt text shown within the widget.
int height: is the desired height of the box.

If zero, the height is based on the screen size.
If greater than zero, the requested height is added to the minimum box size.

int width: is the desired width of the box.

If zero, the height is based on the screen size.
If greater than zero, the requested width is constrained by the minimum box size and the width of the buttons.

int hour: is the initial hour shown. If the value is negative, the current hour is used. Returns DLG_EXIT_ERROR if the value specified is greater than or equal to 24.
int minute: is the initial minute shown. If the value is negative, the current minute is used. Returns DLG_EXIT_ERROR if the value specified is greater than or equal to 60.
int second: is the initial second shown. If the value is negative, the current second is used. Returns DLG_EXIT_ERROR if the value specified is greater than or equal to 60.

dialog_treeview¶

implements the "--treeview" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int list_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
char ** items: is the list of items, contain tag, name, and optionally help strings (if dialog_vars.item_help is set). The initial selection state for each item is also in this list.
int flag

flag: is either FLAG_CHECK, for checklists (multiple selections), or FLAG_RADIO for radiolists (a single selection).

dialog_yesno¶

implements the "--yesno" option.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.

UTILITY FUNCTIONS¶

Most functions that implement lower-level functionality for the command-line dialog program or widgets, have names beginning "dlg_". Bowing to longstanding usage, the functions that initialize the display and end it are named init_dialog and end_dialog.

The only non-widget function whose name begins with "dialog_" is dialog_version, which returns the version number of the library as a string.

A few functions are prefixed "_dlg_", because they are required for internal use, but not intended as part of the library application programming interface.

Here is a brief summary of the utility functions and their parameters:

dlg_add_callback¶

Add a callback, used to allow polling input from multiple tailbox widgets.

DIALOG_CALLBACK *p: contains the callback information.

dlg_add_callback_ref¶

Like dlg_add_callback, but passes a reference to the DIALOG_CALLBACK as well as a pointer to a cleanup function which will be called when the associated input ends.

DIALOG_CALLBACK **p: points to the callback information. This is a reference to the pointer so that the caller's pointer can be zeroed when input ends.
DIALOG_FREEBACK func: function to call when input ends, e.g., to free caller's additional data.

dlg_add_help_formitem¶

This is a utility function used enforce consistent behavior for the DIALOG_VARS.help_tags and DIALOG_VARS.item_help variables.

int *result: this is updated to DLG_EXIT_ITEM_HELP if DIALOG_VARS.item_help is set.
char **tag: the tag- or help-text is stored here.
DIALOG_FORMITEM *item: contains the list item to use for tag- or help-text.

dlg_add_help_listitem¶

This is a utility function used enforce consistent behavior for the DIALOG_VARS.help_tags and DIALOG_VARS.item_help variables.

int *result: this is updated to DLG_EXIT_ITEM_HELP if DIALOG_VARS.item_help is set.
char **tag: the tag- or help-text is stored here.
DIALOG_LISTITEM *item: contains the list item to use for tag- or help-text.

dlg_add_last_key¶

Report the last key entered by the user. This implements the --last-key command-line option, using dialog_vars.last_key.

int mode: controls the way the last key report is separated from other results:

-2: (no separator)
-1: (separator after the key name)
0: (separator is optionally before the key name)
1: (same as -1)

dlg_add_quoted¶

Add a quoted string to the result buffer (see dlg_add_result). If no quotes are necessary, none are used. If dialog_vars.single_quoted is set, single-quotes are used. Otherwise, double-quotes are used.

char * string: is the string to add.

dlg_add_result¶

Add a string to the result buffer dialog_vars.input_result.

char * string: is the string to add.

dlg_add_separator¶

Add an output-separator to the result buffer dialog_vars.input_result. If dialog_vars.output_separator is set, use that. Otherwise, if dialog_vars.separate_output is set, use newline. If neither is set, use a space.

dlg_add_string¶

Add a quoted or unquoted string to the result buffer (see dlg_add_quoted) and dlg_add_result), according to whether dialog_vars.quoted is true.

char * string: is the string to add.

dlg_align_columns¶

Copy and reformat an array of pointers to strings, aligning according to the column separator dialog_vars.column_separator. If no column separator is set, the array will be unmodified; otherwise it is copied and reformatted.

: Caveat: This function is only implemented for 8-bit characters.

char **target: This is the array to reformat. It points to the first string to modify.
int per_row: This is the size of the struct for each row of the array.
int num_rows: This is the number of rows in the array.

dlg_allocate_gauge¶

Allocates a gauge widget. Use dlg_update_gauge to display the result.

const char * title: is the title string to display at the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int percent: is the percentage to show in the progress bar.

dlg_asciibox¶

returns its parameter transformed to the corresponding "+" or "-", etc., for the line-drawing characters used in dialog. If the parameter is not a line-drawing or other special character such as ACS_DARROW, it returns 0.

chtype ch: is the parameter, usually one of the ACS_xxx constants.

dlg_attr_clear¶

Set window to the given attribute.

WINDOW * win: is the window to update.
int height: is the number of rows to update.
int width: is the number of columns to update.
chtype attr: is the attribute, e.g., A_BOLD.

dlg_auto_size¶

Compute window size based on the size of the formatted prompt and minimum dimensions for a given widget.

Dialog sets dialog_state.text_height and dialog_state.text_width for the formatted prompt as a side-effect.

Normally dialog writes the formatted prompt to the curses window, but it will write the formatted prompt to the output stream if dialog_state.text_only is set.

const char * title: is the title string to display at the top of the widget.
const char * prompt: is the message text which will be displayed in the widget, used here to determine how large the widget should be.

: If the value is NULL, dialog allows the widget to use the whole screen, i.e., if the values referenced by height and/or width are zero.

int * height: is the nominal height. Dialog checks the referenced value and may update it:

if the value is negative, dialog updates it to the available height of the screen, after reserving rows for the window border and shadow, as well as taking into account dialog_vars.begin_y and dialog_vars.begin_set.
if the value is zero, dialog updates it to the required height of the window, taking into account a (possibly) multi-line prompt.
if the value is greater than zero, dialog uses it internally, but restores the value on return.

int * width: is the nominal width. Dialog checks the referenced value and may update it:

if the value is negative, dialog updates it to the available width of the screen, after reserving rows for the window border and shadow, as well as taking into account dialog_vars.begin_x and dialog_vars.begin_set.
if the value is zero, dialog updates it to the required width of the window, taking into account a (possibly) multi-line prompt.
if the value is greater than zero, dialog uses it internally, but restores the value on return.

int boxlines: is the number of lines to reserve in the vertical direction.
int mincols: is the minimum number of columns to use.

dlg_auto_sizefile¶

Like dlg_auto_size, but use a file contents to decide how large the widget should be.

const char * title: is the title string to display at the top of the widget.
const char * file: is the name of the file.
int * height: is the nominal height.

: If it is -1, use the screen's height (after subtracting dialog_vars.begin_y if dialog_vars.begin_set is true).
: If it is greater than zero, limit the referenced value to the screen-height after verifying that the file exists.

int * width: is the nominal width.

: If it is -1, use the screen's width (after subtracting dialog_vars.begin_x if dialog_vars.begin_set is true).
: If it is greater than zero, limit the referenced value to the screen-width after verifying that the file exists.

int boxlines: is the number of lines to reserve on the screen for drawing boxes.
int mincols: is the number of columns to reserve on the screen for drawing boxes.

dlg_beeping¶

If dialog_vars.beep_signal is nonzero, this calls beep once and sets dialog_vars.beep_signal to zero.

dlg_boxchar¶

returns its chtype parameter transformed as follows:

if neither dialog_vars.ascii_lines nor dialog_vars.no_lines is set.
if dialog_vars.ascii_lines is set, returns the corresponding "+" or "-", etc., for the line-drawing characters used in dialog.
otherwise, if dialog_vars.no_lines is set, returns a space for the line-drawing characters.
if the parameter is not a line-drawing or other special character such as ACS_DARROW, it returns the parameter unchanged.

dlg_box_x_ordinate¶

returns a suitable x-ordinate (column) for a new widget. If dialog_vars.begin_set is 1, use dialog_vars.begin_x; otherwise center the widget on the screen (using the width parameter).

int width: is the width of the widget.

dlg_box_y_ordinate¶

returns a suitable y-ordinate (row) for a new widget. If dialog_vars.begin_set is 1, use dialog_vars.begin_y; otherwise center the widget on the screen (using the height parameter).

int height: is the height of the widget.

dlg_buildlist¶

This is an alternate interface to the buildlist widget which allows the application to read the list item states back directly without putting them in the output buffer.

const char * title: is the title string to display at the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int list_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
DIALOG_LISTITEM * items: is the list of items, contain tag, name, and optionally help strings (if dialog_vars.item_help is set). The initial selection state for each item is also in this list.
const char * states: This is a list of characters to display for the given states. Normally a buildlist provides true (1) and false (0) values, which the widget displays as "*" and space, respectively. An application may set this parameter to an arbitrary null-terminated string. The widget determines the number of states from the length of this string, and will cycle through the corresponding display characters as the user presses the space-bar.
int order_mode: is reserved for future enhancements
int * current_item: The widget sets the referenced location to the index of the current display item (cursor) when it returns.

dlg_button_count¶

Count the buttons in the list.

const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.

dlg_button_key¶

If a key was bound to one of the button-codes in dlg_result_key, fake a button-value and an “Cancel” key to cause the calling widget to return the corresponding status.

See dlg_ok_buttoncode, which maps settings for ok/extra/help and button number into exit-code.

dlg_button_layout¶

Make sure there is enough space for the buttons by computing the width required for their labels, adding margins and limiting based on the screen size.

const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.
int * limit: the function sets the referenced limit to the width required for the buttons (limited by the screen size) if that is wider than the passed-in limit.

dlg_button_sizes¶

Compute the size of the button array in columns.

const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.
int vertical: is true if the buttons are arranged in a column rather than a row.
int * longest: Return the total number of columns in the referenced location.
int * length: Return the longest button's columns in the referenced location.

dlg_button_to_char¶

Find the first uppercase character in the label, which we may use for an abbreviation. If the label is empty, return -1. If no uppercase character is found, return 0. Otherwise return the uppercase character.

Normally dlg_draw_buttons and dlg_char_to_button use the first uppercase character. However, they keep track of all of the labels and if the first has already been used in another label, they will continue looking for another uppercase character. This function does not have enough information to make that check.

const char * label: is the label to test.

dlg_button_x_step¶

Compute the step-size needed between elements of the button array.

const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.
int limit: is the maximum number of columns to allow for the buttons.
int * gap: store the nominal gap between buttons in the referenced location. This is constrained to be at least one.
int * margin: store the left+right total margins (for the list of buttons) in the referenced location.
int * step: store the step-size in the referenced location.

dlg_calc_list_width¶

Calculate the minimum width for the list, assuming none of the items are truncated.

int item_no: is the number of items.
DIALOG_LISTITEM * items: contains a name and text field, e.g., for checklists or radiobox lists. The function returns the sum of the widest columns needed for of each of these fields.

: If dialog_vars.no_items is set, the text fields in the list are ignored.

dlg_calc_listh¶

Calculate new height and list_height values.

int * height: on input, is the height without adding the list-height. On return, this contains the total list-height and is the actual widget's height.
int * list_height: on input, is the requested list-height. On return, this contains the number of rows available for displaying the list after taking into account the screen size and the dialog_vars.begin_set and dialog_vars.begin_y variables.
int item_no: is the number of items in the list.

dlg_calc_listw¶

This function is obsolete, provided for library-compatibility. It is replaced by dlg_calc_list_width.

int item_no: is the number of items.
char ** items: is a list of character pointers.
int group: is the number of items in each group, e.g., the second array index.

dlg_char_to_button¶

Given a list of button labels, and a character which may be the abbreviation for one, find it, if it exists. An abbreviation will be the first character which happens to be capitalized in the label. If the character is found, return its index within the list of labels. Otherwise, return DLG_EXIT_UNKNOWN.

int ch: is the character to find.
const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.

dlg_checklist¶

This entrypoint provides the --checklist or --radiolist functionality without the limitations of dialog's command-line syntax (compare to dialog_checklist).

const char * title: is the title string to display at the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int list_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of items.
DIALOG_LISTITEM * items: This is a list of the items to display in the checklist.
const char * states: This is a list of characters to display for the given states. Normally a checklist provides true (1) and false (0) values, which the widget displays as "*" and space, respectively. An application may set this parameter to an arbitrary null-terminated string. The widget determines the number of states from the length of this string, and will cycle through the corresponding display characters as the user presses the space-bar.
int flag: This is should be one of FLAG_CHECK or FLAG_RADIO, depending on whether the widget should act as a checklist or radiobox.
int * current_item: The widget sets the referenced location to the index of the current display item (cursor) when it returns.

dlg_check_scrolled¶

given a function key (or other key that was mapped to a function key), check if it is one of the up/down scrolling functions:

DLGK_PAGE_FIRST,
DLGK_PAGE_LAST,
DLGK_GRID_UP,
DLGK_GRID_DOWN,
DLGK_PAGE_PREV or
DLGK_PAGE_NEXT.

Some widgets use these key bindings for scrolling the prompt-text up and down, to allow for display in very small windows.

The function returns 0 (zero) if it finds one of these keys, and -1 if not.

int key: is the function-key to check
int last: is the number of lines which would be used to display the scrolled prompt in an arbitrarily tall window. It is used here to check limits for the offset value.
int page: this is the available height for writing scrolled text, which is smaller than the window if it contains buttons.
bool * show: on return, holds TRUE if dlg_print_scrolled should be used to redisplay the prompt text.
int * offset: on entry, holds the starting line number (counting from zero) last used for dlg_print_scrolled. On return, holds the updated starting line number.

dlg_clear¶

Set window to the default dialog screen attribute. This is set in the rc-file with screen_color.

dlg_clr_result¶

Free storage used for the result buffer (dialog_vars.input_result). The corresponding pointer is set to NULL.

dlg_color_count¶

Return the number of colors that can be configured in dialog.

dlg_color_setup¶

Initialize the color pairs used in dialog.

dlg_count_argv¶

Count the entries in an argument vector.

argv: Points to the argument vector.

dlg_count_columns¶

Returns the number of columns used for a string. This is not necessarily the number of bytes in a string.

const char * string: is the string to measure.

dlg_count_real_columns¶

Returns the number of columns used for a string, accounting for "\Z" sequences which can be used for coloring the text if dialog_vars.colors is set. This is not necessarily the number of bytes in a string.

const char * string: is the string to measure.

dlg_count_wchars¶

Returns the number of wide-characters in the string.

const char * string: is the string to measure.

dlg_create_rc¶

Create a configuration file, i.e., write internal tables to a file which can be read back by dialog as an rc-file.

const char * filename: is the name of the file to write to.

dlg_ctl_size¶

If dialog_vars.size_err is true, check if the given window size is too large to fit on the screen. If so, exit with an error reporting the size of the window.

int height: is the window's height
int width: is the window's width

dlg_default_button¶

If dialog_vars.default_button is positive, return the button-index for that button code, using dlg_ok_buttoncode to test indices starting with zero. Otherwise (or if no match was found for the button code), return zero.

dlg_default_formitem¶

If dialog_vars.default_item is not null, find that name by matching the name field in the list of form items. If found, return the index of that item in the list. Otherwise, return zero.

DIALOG_FORMITEM * items: is the list of items to search. It is terminated by an entry with a null name field.

dlg_default_item¶

This function is obsolete, provided for library-compatibility. It is replaced by dlg_default_formitem and dlg_default_listitem.

char ** items: is the list of items to search.
int llen: is the number of items in each group, e.g., the second array index.

dlg_defaultno_button¶

If dialog_vars.defaultno is true, and dialog_vars.nocancel is not, find the button-index for the “Cancel” button. Otherwise, return the index for “OK” (always zero).

dlg_del_window¶

Remove a window, repainting everything else.

WINDOW * win: is the window to remove.

dlg_der_window¶

create a derived window, e.g., for an input area of a widget

WINDOW * win: is the parent window
int height: is the subwindow's height
int width: is the subwindow's width
int y: is the subwindow's top-row
int x: is the subwindow's left-column

dlg_does_output¶

This is called each time a widget is invoked which may do output. It increments dialog_state.output_count, so the output function in dialog can test this and add a separator.

dlg_draw_arrows¶

Draw up/down arrows on a window, e.g., for scrollable lists. It calls dlg_draw_arrows2 using the menubox_color and menubox_border_color attributes.

WINDOW * dialog: is the window on which to draw an arrow.
int top_arrow: is true if an up-arrow should be drawn at the top of the window.
int bottom_arrow: is true if an down-arrow should be drawn at the bottom of the window.
int x: is the zero-based column within the window on which to draw arrows.
int top: is the zero-based row within the window on which to draw up-arrows as well as a horizontal line to show the window's top.
int bottom: is the zero-based row within the window on which to draw down-arrows as well as a horizontal line to show the window's bottom.

dlg_draw_arrows2¶

Draw up/down arrows on a window, e.g., for scrollable lists.

WINDOW * dialog: is the window on which to draw an arrow.
int top_arrow: is true if an up-arrow should be drawn at the top of the window.
int bottom_arrow: is true if an down-arrow should be drawn at the bottom of the window.
int x: is the zero-based column within the window on which to draw arrows.
int top: is the zero-based row within the window on which to draw up-arrows as well as a horizontal line to show the window's top.
int bottom: is the zero-based row within the window on which to draw down-arrows as well as a horizontal line to show the window's bottom.
chtype attr: is the window's background attribute.
chtype borderattr: is the window's border attribute.

dlg_draw_bottom_box¶

Draw a partial box at the bottom of a window, e.g., to surround a row of buttons. It is designed to merge with an existing box around the whole window (see dlg_draw_box), so it uses tee-elements rather than corner-elements on the top corners of this box.

WINDOW * win: is the window to update.

dlg_draw_bottom_box2¶

Draw a partial box at the bottom of a window, e.g., to surround a row of buttons. It is designed to merge with an existing box around the whole window (see dlg_draw_box2), so it uses tee-elements rather than corner-elements on the top corners of this box.

WINDOW * win: is the window to update.
chtype on_left: is used to color the upper/left edges of the box, i.e., the tee-element and horizontal line
chtype on_right: is used to color the right edge of the box, i.e., the tee-element
chtype on_inside: is used to fill-color the inside of the box

dlg_draw_box¶

Draw a rectangular box with line drawing characters.

WINDOW * win: is the window to update.
int y: is the top row of the box.
int x: is the left column of the box.
int height: is the height of the box.
int width: is the width of the box.
chtype boxchar: is used to color the right/lower edges. It also is fill-color used for the box contents.
chtype borderchar: is used to color the upper/left edges.

dlg_draw_box2¶

Draw a rectangular box with line drawing characters.

WINDOW * win: is the window to update.
int y: is the top row of the box.
int x: is the left column of the box.
int height: is the height of the box.
int width: is the width of the box.
chtype boxchar: is used to fill-color for the box contents.
chtype borderchar: is used to color the upper/left edges.
chtype borderchar2: is used to color the right/lower edges.

dlg_draw_buttons¶

Print a list of buttons at the given position.

WINDOW * win: is the window to update.
int y: is the starting row.
int x: is the starting column.
const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.
int selected: is the index within the list of the selected button.
int vertical: is true if the buttons are arranged in a column rather than a row.
int limit: is the number of columns (or rows if vertical) allowed for the display.

dlg_draw_helpline¶

draw the text in dialog_vars.help_line at the bottom of the given window.

WINDOW * dialog: is the window to modify.
bool decorations: if true, allow room for the scrolling arrows.

dlg_draw_scrollbar¶

If dialog_state.use_scrollbar is set, draw a scrollbar on the right margin of windows holding scrollable data. Also (whether or not the scrollbar is drawn), annotate the bottom margin of the window with the percentage of data by the bottom of that window, and call dlg_draw_arrows2 to put markers on the window showing when more data is available.

WINDOW * win: is the window in which the data is scrolled. Because left, right, top, bottom are passed as parameters, this window can contain additional data.
long first_data: is the zero-based index to the first row of data in the current window.
long this_data: is the zero-based index to the current row of data.
long next_data: is the zero-based index to the next data after the current row.
long total_data: is the total number of rows of data.
int left: is the zero-based left margin/column of the window. The up/down arrows are draw inset by 5 columns from this point.
int right: is the zero-based right margin/column of the window. The scrollbar is drawn flush against this column.
int top: is the zero-based row within the window on which to draw up-arrows as well as a horizontal line to show the window's top.
int bottom: is the zero-based row within the window on which to draw down-arrows as well as a horizontal line to show the window's bottom.
chtype attr: is the window's background attribute.
chtype borderattr: is the window's border attribute.

dlg_draw_shadow¶

Draw shadows along the right and bottom edge of a window to give it a 3-dimensional look. (The height, etc., may not be the same as the window's actual values).

WINDOW * win: is the window to update.
int height: is the height of the window.
int width: is the width of the window.
int y: is the top row of the window.
int x: is the left column of the window.

dlg_draw_title¶

Draw a title centered at the top of the window.

WINDOW * win: is the window to update.
const char * title: is the title string to display at the top of the widget.

dlg_dummy_menutext¶

This is a utility function which supports the --inputmenu option of the dialog program. If dialog_vars.input_menu is set, dialog_menu passes this pointer to dlg_menu as the rename_menutext parameter. Otherwise, it passes dlg_dummy_menutext.

The function should only return DLG_EXIT_ERROR.

DIALOG_LISTITEM * items: is the list of menu items
int current: is the index of the currently-selected item
char * newtext: is the updated text for the menu item

dlg_dump_keys¶

Write all user-defined key-bindings to the given stream, e.g., as part of dlg_create_rc.

FILE * fp: is the stream on which to write the bindings.

dlg_dump_window_keys¶

Write all user-defined key-bindings to the given stream, e.g., as part of dlg_create_rc.

FILE * fp: is the stream on which to write the bindings.
WINDOW * win: is the window for which bindings should be dumped. If it is null, then only built-in bindings are dumped.

dlg_eat_argv¶

Remove one or more items from an argument vector.

int * argcp: in/out parameter giving the length of the argument vector. char *** argvp in/out parameter pointing to the argument vector. int start starting index. int count number of arguments to remove.

dlg_edit_offset¶

Given the character-offset in the string, returns the display-offset where dialog should position the cursor. In this context, “characters” may be multicolumn, since the string can be a multibyte character string.

char * string: is the string to analyze
int offset: is the character-offset
int x_last: is a limit on the column positions that can be used, e.g., the window's size.

dlg_edit_string¶

Updates the string and character-offset, given various editing characters or literal characters which are inserted at the character-offset. Returns true if an editing change was made (and the display should be updated), and false if the key was something like KEY_ENTER, which is a non-editing action outside this function.

char * string: is the (multibyte) string to update
int * offset: is the character-offset
int key: is the editing key
int fkey: is true if the editing key is a function-key
bool force: is used in a special loop case by calling code to force the return value of this function when a function-key code 0 is passed in.

dlg_exit¶

Given an internal exit code, check if the corresponding environment variable is set. If so, remap the exit code to match the environment variable. Finally call exit with the resulting exit code.

int code: is the internal exit code, e.g., DLG_EXIT_OK, which may be remapped.

The dialog program uses this function to allow shell scripts to remap the exit codes so they can distinguish ESC from ERROR.

dlg_exitcode2s¶

Returns the name of an exit-code, e.g., “OK” for DLG_EXIT_OK.

int code: is an exit-code for dialog as defined in <dialog.h>.

dlg_exitname2n¶

Returns an exit-code as the reverse of dlg_exitcode2n, e.g., 0 (DLG_EXIT_OK) for the “OK” string.

const char * name: is the name of an exit-code for dialog as defined in <dialog.h> but omitting the “DLG_EXIT_” prefix.

dlg_exit_buttoncode¶

Map the given button index for dlg_exit_label into dialog's exit-code.

int button: is the button index

dlg_exit_label¶

Return a list of button labels. If dialog_vars.extra_button is true, return the result of dlg_ok_labels. Otherwise, return a list with the “Exit” label and (if dialog_vars.help_button is set) the “Help” button as well.

dlg_exiterr¶

Quit program killing all tailboxbg widgets.

const char * fmt: is the format of the printf-like message to write.
...: are the variables to apply to the fmt format.

dlg_find_index¶

Given the character-offset to find in the list, return the corresponding array index.

const int *list: contains a list of character-offsets, i.e., indices into a string that denote the beginning of multibyte characters.
int limit: is the last index into list to search.
int to_find: is the character-offset to find.

dlg_finish_string¶

If DIALOG_STATE.finish_string is true, this function discards data used to speed up layout computations.

const char * string: is the address of the string whose data should be discarded. The address rather than contents is used as the unique identifier because some of the caching is used for editable input-fields.

dlg_flush_getc¶

Cancel the local data saved by dlg_last_getc.

dlg_editbox¶

This entrypoint provides the --editbox functionality without the limitations of dialog's command-line syntax (compare to dialog_editbox).

const char * title: is the title string to display at the top of the widget.
char *** list: is a pointer to an array of char * pointers. The array is allocated by the caller, and so are the strings to which it points. The dlg_editbox function may reallocate the array and the strings.
int * rows: points to the nominal length of list. The referenced value is updated iflist is reallocated.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.

dlg_form¶

This entrypoint provides the --form functionality without the limitations of dialog's command-line syntax (compare to dialog_form).

const char * title: is the title string to display at the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int form_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of items.
DIALOG_FORMITEM * items: This is a list of the items to display in the form.
int * current_item: The widget sets the referenced location to the index of the current display item (cursor) when it returns.

dlg_free_columns¶

Free data allocated by dlg_align_columns.

char **target: This is the array which was reformatted. It points to the first string to free.
int per_row: This is the size of the struct for each row of the array.
int num_rows: This is the number of rows in the array.

dlg_free_formitems¶

Free memory owned by a list of DIALOG_FORMITEM's.

DIALOG_FORMITEM * items: is the list to free.

dlg_free_gauge¶

Remove the gauge widget from the screen and free its associated memory.

void *objptr: points to the gauge widget.

dlg_getc¶

Read a character from the given window. Handle repainting here (to simplify things in the calling application). Also, if input-callback(s) are set up, poll the corresponding files and handle the updates, e.g., for displaying a tailbox. Returns the key-code.

WINDOW * win: is the window within which to read.
int * fkey: as a side-effect, set this to true if the key-code is really a function-key.

dlg_getenv_num¶

Get a number from the environment:

If the caller provides a pointer in the second parameter, return success/failure for the function return, and the actual value via the pointer. Use this for decoding arbitrary numbers, e.g., negative or zero.
If the caller does not provide a pointer, return the decoded value for the function-return. Use this when only values greater than zero are useful.

char * name: is the name of the environment-variable to retrieve.
int * value: is the optional pointer to a return-value.

dlg_getenv_str¶

Get a string from the environment, rejecting those which are entirely blank.

char * name: is the name of the environment-variable to retrieve.

dlg_get_attrs¶

extract the video attributes from the given window.

WINDOW * win: is the window from which to get attributes.

dlg_getc_callbacks¶

passes the given key-code ch to the current window that has established a callback. If the callback returns zero, remove it and try the next window. If no more callbacks remain, return. If any callbacks were found, return true, otherwise false.

int ch: is the key-code
int fkey: is true if the key is a function-key
int * result: is used to pass an exit-code to the caller, which should pass that via dlg_exit.

dlg_index_columns¶

Build a list of the display-columns for the given multibyte string's characters.

const char * string: is the string to analyze

dlg_index_wchars¶

Build an index of the wide-characters in the string, so the caller can easily tell which byte-offset begins a given wide-character.

const char * string: is the string to analyze

dlg_item_help¶

Draw the string for the dialog_vars.item_help feature.

const char * txt: is the help-message

dlg_keep_tite¶

This performs the check and modifications for the command-line option "--keep-tite", used in init_dialog as well as for the command-line option --erase-on-exit.

FILE * output: is the output stream used for displaying widgets. It is either stdout or stderr, depending on the --stdout option.

dlg_killall_bg¶

If dialog has callbacks active, purge the list of all that are not marked to keep in the background. If any remain, run those in a background process.

int * retval: stores the exit-code to pass back to the caller.

dlg_last_getc¶

returns the most recent character that was read via dlg_getc.

dlg_limit_columns¶

Given a column limit, count the number of wide characters that can fit into that limit. The offset is used to skip over a leading character that was already written.

const char * string: is the string to analyze
int limit: is the column limit
int offset: is the starting offset from which analysis should continue

dlg_lookup_key¶

Check for a key-binding. If there is no binding associated with the widget, it simply returns the given curses-key. Otherwise, it returns the result of the binding

WINDOW * win: is the window on which the binding is checked
int curses_key: is the curses key-code
int * dialog_key: is the corresponding dialog internal code (see DLG_KEYS_ENUM in dlg_key.h).

dlg_max_input¶

Limit the parameter according to dialog_vars.max_input

int max_len: is the value to limit. If it is less than or equal to zero, the return value is the maximum value for dialog_vars.max_input.

dlg_match_char¶

Match a given character against the beginning of the string, ignoring case of the given character. The matching string must begin with an uppercase character.

int ch: is the character to check
const char * string: is the string to search

dlg_menu¶

This entrypoint provides the --menu functionality without the limitations of dialog's command-line syntax (compare to dialog_menu).

const char * title: is the title string to display at the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int menu_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of items.
DIALOG_LISTITEM * items: This is a list of the items to display in the form.
int * current_item: The widget sets the referenced location to the index of the current display item (cursor) when it returns.
DIALOG_INPUTMENU rename_menutext: If this is not dlg_dummy_menutext, the widget acts like an inputmenu widget, providing an extra “Rename” button, which activates an edit feature on the selected menu item.

dlg_move_window¶

Moves/resizes the given window to the given position and size.

WINDOW *win: is the window to move/resize.
WINDOW *height: is the height of the resized window.
WINDOW *width: is the width of the resized window.
WINDOW *y: y-ordinate to use for the repositioned window.
WINDOW *x: x-ordinate to use for the repositioned window.

dlg_mouse_bigregion¶

Retrieve the big-region under the pointer.

int y: is the row on which the mouse click occurred
int x: is the column on which the mouse click occurred

dlg_mouse_free_regions¶

Free the memory associated with mouse regions.

dlg_mouse_mkbigregion¶

Creates a region on which the mouse-clicks will return a specified code.

int y: is the top-row of the region.
int x: is the left-column of the region.
int height: is the height of the region.
int width: is the width of the region.
int code: is a code used to make the region unique within a widget
int step_x: is used in modes 2 (columns) and 3 (cells) to determine the width of a column/cell.
int step_y: is currently unused
int mode: is used to determine how the mouse position is translated into a code (like a function-key):

1: index by lines
2: index by columns
3: index by cells

dlg_mouse_mkregion¶

int y: is the top-row of the region.
int x: is the left-column of the region.
int height: is the height of the region.
int width: is the width of the region.
int code: is a code used to make the region unique within a widget

dlg_mouse_region¶

Retrieve the frame under the mouse pointer

int y: is the row of the mouse-click
int x: is the column of the mouse-click

dlg_mouse_setbase¶

Sets a base for subsequent calls to dlg_mouse_mkregion, so they can make regions relative to the start of a given window.

int x: is the left-column for the base
int y: is the top-row for the base

dlg_mouse_setcode¶

Sets a value used internally by dlg_mouse_mkregion which is added to the code parameter. By providing different values, e.g., multiples of KEY_MAX, it is possible to support multiple “big” regions in a widget. The buildlist widget uses this feature to recognize mouse-clicks in the left/right panes.

int code: is the value to add to dlg_mouse_mkregion's code parameter.

dlg_mouse_wgetch¶

is a wrapper for dlg_getc which additionally maps mouse-clicks (if the curses library supports those) into extended function-keys which encode the position according to the mode in dlg_mouse_mkbigregion. Returns the corresponding key-code.

WINDOW * win: is the window on which to perform the input
int * fkey: the referenced location is set to true if the key-code is an actual or extended (mouse) function-key.

dlg_mouse_wgetch_nowait¶

This is a non-blocking variant of dlg_mouse_wgetch.

WINDOW * win: is the window on which to perform the input
int * fkey: the referenced location is set to true if the key-code is an actual or extended (mouse) function-key.

dlg_need_separator¶

Check if an output-separator is needed. If dialog_vars.output_separator is set, return true. Otherwise, if dialog_vars.input_result is nonempty, return true. If neither, return false.

dlg_new_modal_window¶

Create a modal window, optionally with a shadow. The shadow is created if dialog_state.use_shadow is true.

WINDOW * parent: is the parent window (usually the top-level window of a widget)
int height: is the window's height
int width: is the window's width
int y: is the window's top-row
int x: is the window's left-column

dlg_new_window¶

Create a window, optionally with a shadow. The shadow is created if dialog_state.use_shadow is true.

int height: is the window's height
int width: is the window's width
int y: is the window's top-row
int x: is the window's left-column

dlg_next_button¶

Return the next index in the list of labels.

const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.
int button: is the current button-index.

dlg_next_ok_buttonindex¶

Assuming that the caller is using dlg_ok_labels to list buttons, find the next index in the list of buttons.

int current: is the current index in the list of buttons
int extra: if negative, provides a way to enumerate extra active areas on the widget.

dlg_ok_buttoncode¶

Map the given button index for dlg_ok_labels into dialog's exit-code.

int button: is the button-index (which is not necessarily the same as the index in the list of labels).

dlg_ok_button_key¶

Calls dlg_button_key with the “Cancel” button disabled, e.g., for the textbox widget.

dlg_ok_label¶

Returns a list with the “Ok” label, and if dialog_vars.help_button is true, the “Help” label as well.

dlg_ok_labels¶

Return a list of button labels for the OK/Cancel group of widgets.

dlg_ordinate¶

Decode the string as an integer, decrement if greater than zero to make a curses-ordinate from a dialog-ordinate.

dlg_parse_bindkey¶

Parse the parameters of the “bindkeys” configuration-file entry. This expects widget name which may be "*", followed by curses key definition and then dialog key definition.

char * params: is the parameter string to parse.

dlg_parse_rc¶

Parse the configuration file and set up variables.

dlg_popen¶

Open a pipe which ties the standard error and output together. The popen function captures only the standard output of a command.

const char *command: The shell command to run.
const char *type: Like popen, "r" is used to read, and "w" is used to write.

dlg_prev_button¶

Return the previous index in the list of labels.

const char ** labels: is a list of (pointers to) button labels terminated by a null pointer.
int button: is the current button index

dlg_print_listitem¶

This is a helper function used for the various “list” widgets, e.g., checklist, menu, buildlist, treeview. Each list-widget has “tag” and “description” values for each item which can be displayed. If dialog_vars.no_tags is true, the “tag” value is not shown. The first character of the first value shown (tag or description) is highlighted to indicate that the widget will match it for quick navigation.

WINDOW *win: the window in which to display the text
const char *text: the value to display
int climit: the number of columns available for printing the text
bool first: true if this is the first call (for “tag” and “description”), and the first character of the value should be highlighted.
int selected: nonzero if the text should be displayed using the “selected” colors

dlg_print_scrolled¶

This is a wrapper for dlg_print_autowrap which allows the user to scroll too-long prompt text up/down.

See dlg_check_scrolled for a function which updates the offset variable used as a parameter here. It complements this function; you need both. If pauseopt is set, this function returns an updated last parameter, needed for dlg_check_scrolled calls.

WINDOW * win: is the window to update.
const char * prompt: is the string to print
int offset: is the starting line-number to write wrapped text.
int height: is the available height for writing the wrapped text
int width: is the width that the wrapping should occur in
int pauseopt: is true if the extra functionality for scrolling should be enabled. If false, this calls dlg_print_autowrap without doing any scrolling.

dlg_print_line¶

Print one line of the prompt in the window within the limits of the specified right margin. The line will end on a word boundary and a pointer to the start of the next line is returned, or a NULL pointer if the end of *prompt is reached.

WINDOW *win: is the window to update.
chtype *attr: holds the starting attributes, and is updated to reflect the final attributes applied to the string.
const char *prompt: is the string to print
int lm: is the left margin.
int rm: is the right margin
int *x: returns the ending x-ordinate.

dlg_prev_ok_buttonindex¶

Find the previous button index in the list from dlg_ok_labels.

int current: is the current index
int extra: if negative provides a way to enumerate extra active areas on the widget.

dlg_print_autowrap¶

Print a string of text in a window, automatically wrap around to the next line if the string is too long to fit on one line. Note that the string may contain embedded newlines. The text is written starting at the top of the window.

WINDOW * win: is the window to update.
const char * prompt: is the string to print
int height: is the nominal height the wrapped string is limited to
int width: is the width that the wrapping should occur in

dlg_print_size¶

If dialog_vars.print_siz is true, print the given height/width (from a widget) to dialog_state.output, e.g., Size: height, width.

int height: is the window's height
int width: is the window's width

dlg_print_text¶

Print up to cols columns from text, optionally rendering dialog's escape sequences for attributes and color.

WINDOW * win: is the window to update.
const char * txt: is the string to print
int col: is the column limit
chtype * attr: holds the starting attributes, and is updated to reflect the final attributes applied to the string.

dlg_progressbox¶

implements the "--prgbox" and "--progressbox" options.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget. If empty or null, no prompt is shown.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int pauseopt: if true, an “OK” button will be shown, and the dialog will wait for it to complete. With an “OK” button, it is denoted a “programbox”, without an “OK” button, it is denoted a “progressbox”.
FILE * fp: is the file pointer, which may be a pipe or a regular file.

dlg_put_backtitle¶

Display the background title if dialog_vars.backtitle is non-null. The background title is shown at the top of the screen.

dlg_reallocate_gauge¶

Allocates or reallocates a gauge widget (see dlg_allocate_gauge). Use dlg_update_gauge to display the result.

void ** objptr: If the pointer referenced by this parameter is null, the function creates a new gauge widget using dlg_allocate_gauge. Otherwise, it updates the title and cprompt values, reusing the window from the previous call on this function. As a side-effect, the function stores the updated object-pointer via the objptr parameter.
const char * title: is the title string to display at the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is adjusted to use the available screen size.
int width: is the desired width of the box. If zero, the height is adjusted to use the available screen size.
int percent: is the percentage to show in the progress bar.

dlg_register_buttons¶

The widget developer should call this function after dlg_register_window, for the list of button labels associated with the widget. One may bind a key to a button, e.g., “OK” for DLGK_OK,

WINDOW * win: is the window with which to associate the buttons
const char * name: is the widget's binding name (usually the name of the widget).
const char ** buttons: is the list of buttons

dlg_register_window¶

For a given named widget's window, associate a binding table.

WINDOW * win: is the window with which to associate the buttons
const char * name: is the widget's binding name (usually the name of the widget).
DLG_KEYS_BINDING * binding: is the binding table

dlg_remove_callback¶

Remove a callback.

DIALOG_CALLBACK * p: contains the callback information.

dlg_renamed_menutext¶

The function should add “RENAMED” to dialog_vars.input_result , followed by the menu item's name and the newtext value (with a space separating the three items), and return DLG_EXIT_EXTRA.

DIALOG_LISTITEM * items: is the list of menu items
int current: is the index of the currently-selected item
char * newtext: is the updated text for the menu item

dlg_reset_timeout¶

Calls wtimeout with the value saved for a window in the last call to dlg_set_timeout.

dlg_restore_vars¶

Restore dialog's variables from the given variable (see dialog_save_vars).

DIALOG_VARS * save: is the variable from which to restore.

The DIALOG_VARS.input_length and DIALOG_VARS.input_result members are treated specially, since these are used by a widget to pass data to the caller. They are not modified by this function.

dlg_result_key¶

Test a dialog internal keycode to see if it corresponds to one of the push buttons on the widget such as “OK”. This is only useful if there are user-defined key bindings, since there are no built-in bindings that map directly to DLGK_OK, etc. Return true if a mapping was done.

int dialog_key: is the dialog key to test
int fkey: is true if this is a function key
int * resultp: store the result of the mapping in the referenced location.

dlg_save_vars¶

Save dialog's variables into the given variable (see dlg_restore_vars).

DIALOG_VARS * save: is the variable into which to save.

dlg_set_focus¶

Set focus on the given window, making it display above other windows on the screen.

WINDOW * parent: is the parent window (usually the top-level window of a widget)
WINDOW * win: is the window on which to place focus (usually a subwindow of a widget)

dlg_set_result¶

Setup a fixed-buffer for the result in dialog_vars.input_result

const char * string: is the new contents for the result

dlg_set_timeout¶

Calls wtimeout to establish a preferred timeout for nonblocking reads, e.g., to allow the gauge widget to handle window-resizing events. The dlg_may_resize function temporarily overrides this value, to allow it to skip over the error codes returned while the ncurses library processes window-resizing events. It restores the value established in this call by calling dlg_restore_timeout.

WINDOW * win: is the window whose input-timeout should be set
bool will_getc: is true if the widget is expected to read keyboard characters. Some (such as the gauge widget) do not.

dlg_show_string¶

Displays the string, shifted as necessary, to fit within the box and show the current character-offset.

WINDOW * win: is the window within which to display
const char * string: is the string to display
int offset: is the starting (character, not bytes) offset
chtype attr: is the window attribute to use for the string
int y_base: beginning row on screen
int x_base: beginning column on screen
int x_last: number of columns on screen
bool hidden: if true, do not echo input
bool force: if true, force repaint

dlg_strclone¶

duplicate the string, like strdup.

const char * cprompt: is the string to duplicate

dlg_strcmp¶

compare two strings, ignoring case.

const char * a: is one string
const char * b: is the other string

dlg_string_to_argv¶

Convert a string to an argument vector returning an index (which must be freed by the caller). The string is modified:

Blanks between arguments are replaced by nulls.
Normally arguments are separated by blanks; however you can double-quote an argument to enclose blanks. The surrounding double-quotes are removed from the string.
A backslash preceding a double-quote within double-quotes is removed.
A backslash preceding a newline outside double-quotes is removed.
Except for special cases, backslashes are preserved in the strings, since other dialog functions interpret backslashes, e.g., for colors.

char *blob: is the string to convert.

dlg_sub_window¶

create a subwindow, e.g., for an input area of a widget

WINDOW * win: is the parent window
int height: is the subwindow's height
int width: is the subwindow's width
int y: is the subwindow's top-row
int x: is the subwindow's left-column

dlg_tab_correct_str¶

If the dialog_vars.tab_correct is true, convert tabs to single spaces. Return the converted result. The caller is responsible for freeing the string.

char * prompt: is the string to convert

dlg_trace¶

If the parameter is non-null, opens a trace file with that name and stores the file pointer in dialog_state.trace.

dlg_trace_2n¶

logs a numeric value as a comment.

char * name: is the name to log in the comment.
int value: is the value to log in the comment.

dlg_trace_2s¶

logs a string value as a comment. If the value contains embedded newlines, the comment is continued with “#+” markers.

char * name: is the name to log in the comment.
int value: is the value to log in the comment.

dlg_trace_chr¶

If dialog_state.trace is set, translate the parameters into a printable representation, log it on a “chr” line.

int ch: is the nominal keycode value.
int fkey: is nonzero if the value is really a function key. Some of these may be values declared in the DLG_KEYS_ENUM.

dlg_trace_msg¶

Write a formatted message to the trace file.

const char * fmt: is the format of the printf-like message to write.
...: are the variables to apply to the fmt format.

Use the DLG_TRACE macro for portability, in case the trace feature is not compiled into the library. It uses an extra level of parentheses to work with a variable number of parameters, e.g.,

DLG_TRACE(("this is dialog version %s\n", dialog_version()));

dlg_trace_va_msg¶

Write a formatted message to the trace file.

const char *fmt: is the format of the printf-like message to write.
va_list ap: are the variables to apply to the fmt format.

This is used in dlg_exiterr to capture error messages in the trace file:

va_start(ap, fmt);
dlg_trace_msg("## Error: ");
dlg_trace_va_msg(fmt, ap);
va_end(ap);

Unlike dlg_trace_msg, an extra macro is not needed.

dlg_ttysize¶

Returns the screensize without using curses. That allows the function to be used before initializing the screen.

dlg_trace_win¶

If dialog_state.trace is set, log a printable picture of the given window.

dlg_treeview¶

This is an alternate interface to 'treeview' which allows the application to read the list item states back directly without putting them in the output buffer.

const char * title: is the title on the top of the widget.
const char * cprompt: is the prompt text shown within the widget.
int height: is the desired height of the box. If zero, the height is based on the screen size.
int width: is the desired width of the box. If zero, the height is based on the screen size.
int list_height: is the minimum height to reserve for displaying the list. If zero, it is computed based on the given height and width.
int item_no: is the number of rows in items.
DIALOG_LISTITEM * items: is the list of items, contain tag, name, and optionally help strings (if dialog_vars.item_help is set). The initial selection state for each item is also in this list.
const char * states: This is a list of characters to display for the given states. Normally a buildlist provides true (1) and false (0) values, which the widget displays as "*" and space, respectively. An application may set this parameter to an arbitrary null-terminated string. The widget determines the number of states from the length of this string, and will cycle through the corresponding display characters as the user presses the space-bar.
int * depths: This is a list of depths of each item in the tree. It is a separate parameter from items to allow reuse of the existing functions.
int flag: is either FLAG_CHECK, for checklists (multiple selections), or FLAG_RADIO for radiolists (a single selection).
int * current_item: The widget sets the referenced location to the index of the current display item (cursor) when it returns.

dlg_trim_string¶

The dialog program uses this in each widget to adjust the message string, which may contain the newline character (referred to as '\n') and/or the special substring "\n" (which can be translated into a newline character).

There are several optional features:

Unless dialog_vars.nocollapse is set, each tab is converted to a space before other processing.
If dialog_vars.no_nl_expand is not set, and the string has "\n" substrings:

•: The function changes embedded "\n" substrings to '\n' characters.

: The function preserves extra spaces after these substitutions. For instance, spaces following a newline (substring or character) are preserved to use as an indentation.

•: If dialog_vars.cr_wrap is set, the function preserves '\n' newline characters. Otherwise, each '\n' newline character is converted to a space.

•: Otherwise, if dialog_vars.trim_whitespace is set:

This function strips all extra spaces to simplify justification.
If dialog_vars.cr_wrap is set, the function preserves '\n' newline characters. Otherwise, each '\n' newline character is converted to a space.

•: Finally (if dialog_vars.no_nl_expand is set, or the string does not contain "\n" substrings, and dialog_vars.trim_whitespace is not set):

•: Unless dialog_vars.nocollapse is set, sequences of spaces are reduced to a single space.

char * src: is the string to trim

dlg_unregister_window¶

Remove the bindings for a given window.

WINDOW * win: is the window from which to remove bindings

dlg_update_gauge¶

Update a gauge widget to show a different percentage value.

void *objptr: points to the gauge object to update.
int percent: is the new percentage value to display.

dlg_will_resize¶

This filters out bursts of KEY_RESIZE values. Call this after dlg_getc returns KEY_RESIZE, to improve performance.

dlg_yes_buttoncode¶

Map the given button index for dlg_yes_labels into dialog's exit-code.

int button: is the button index

dlg_yes_labels¶

Return a list of buttons for Yes/No labels.

end_dialog¶

End use of dialog functions.

init_dialog¶

Do some initialization for dialog.

FILE *input: is the real tty input of dialog. Usually it is the standard input, but if --input-fd option is used, it may be anything.
FILE *output: is where dialog will send its result. Usually it is the standard error, but if --stdout or --output-fd is used, it may be anything.

AUTHOR¶

Thomas E. Dickey

$Date: 2022/06/15 20:15:28 $

Source file:	dialog.3.en.gz (from dialog 1.3-20230209-1)
Source last updated:	2023-02-11T17:20:00Z
Converted to HTML:	2024-10-28T22:24:08Z