NAME¶
wcstok - split wide-character string into tokens
SYNOPSIS¶
#include <wchar.h>
wchar_t *wcstok(wchar_t *wcs, const wchar_t *delim, wchar_t **ptr);
DESCRIPTION¶
The wcstok() function is the wide-character equivalent of the
strtok(3) function, with an added argument to make it multithread-safe.
It can be used to split a wide-character string wcs into tokens, where
a token is defined as a substring not containing any wide-characters from
delim.
The search starts at wcs, if wcs is not NULL, or at
*ptr, if wcs is NULL. First, any delimiter wide-characters are
skipped, that is, the pointer is advanced beyond any wide-characters which
occur in delim. If the end of the wide-character string is now
reached, wcstok() returns NULL, to indicate that no tokens were
found, and stores an appropriate value in *ptr, so that subsequent
calls to wcstok() will continue to return NULL. Otherwise, the
wcstok() function recognizes the beginning of a token and returns a
pointer to it, but before doing that, it zero-terminates the token by
replacing the next wide-character which occurs in delim with a null
wide character (L'\0'), and it updates *ptr so that subsequent calls
will continue searching after the end of recognized token.
RETURN VALUE¶
The wcstok() function returns a pointer to the next token, or NULL if no
further token was found.
ATTRIBUTES¶
For an explanation of the terms used in this section, see attributes(7).
| Interface |
Attribute |
Value |
| wcstok () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008, C99.
NOTES¶
The original wcs wide-character string is destructively modified during
the operation.
EXAMPLE¶
The following code loops over the tokens contained in a wide-character string.
wchar_t *wcs = ...;
wchar_t *token;
wchar_t *state;
for (token = wcstok(wcs, " \t\n", &state);
token != NULL;
token = wcstok(NULL, " \t\n", &state)) {
...
}
COLOPHON¶
This page is part of release 4.16 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at https://www.kernel.org/doc/man-pages/.
