'\" t
.\"     Title: zdir_patch
.\"    Author: [see the "AUTHORS" section]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 01/17/2021
.\"    Manual: CZMQ Manual
.\"    Source: CZMQ 4.2.1
.\"  Language: English
.\"
.TH "ZDIR_PATCH" "3" "01/17/2021" "CZMQ 4\&.2\&.1" "CZMQ Manual"
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.SH "NAME"
zdir_patch \- Class for work with directory patches
.SH "SYNOPSIS"
.sp
.nf
//  This is a stable class, and may not change except for emergencies\&. It
//  is provided in stable builds\&.
#define ZDIR_PATCH_CREATE 1                  // Creates a new file
#define ZDIR_PATCH_DELETE 2                  // Delete a file

//  Create new patch
CZMQ_EXPORT zdir_patch_t *
    zdir_patch_new (const char *path, zfile_t *file, int op, const char *alias);

//  Destroy a patch
CZMQ_EXPORT void
    zdir_patch_destroy (zdir_patch_t **self_p);

//  Create copy of a patch\&. If the patch is null, or memory was exhausted,
//  returns null\&.
//  Caller owns return value and must destroy it when done\&.
CZMQ_EXPORT zdir_patch_t *
    zdir_patch_dup (zdir_patch_t *self);

//  Return patch file directory path
CZMQ_EXPORT const char *
    zdir_patch_path (zdir_patch_t *self);

//  Return patch file item
CZMQ_EXPORT zfile_t *
    zdir_patch_file (zdir_patch_t *self);

//  Return operation
CZMQ_EXPORT int
    zdir_patch_op (zdir_patch_t *self);

//  Return patch virtual file path
CZMQ_EXPORT const char *
    zdir_patch_vpath (zdir_patch_t *self);

//  Calculate hash digest for file (create only)
CZMQ_EXPORT void
    zdir_patch_digest_set (zdir_patch_t *self);

//  Return hash digest for patch file
CZMQ_EXPORT const char *
    zdir_patch_digest (zdir_patch_t *self);

//  Self test of this class\&.
CZMQ_EXPORT void
    zdir_patch_test (bool verbose);

Please add \*(Aq@interface\*(Aq section in \*(Aq\&./\&.\&./src/zdir_patch\&.c\*(Aq\&.
.fi
.SH "DESCRIPTION"
.sp
The zdir_patch class works with one patch, which says "create this file" or "delete this file" (referring to a zfile item each time)\&.
.sp
Please add \fI@discuss\fR section in \fI\&./\&.\&./src/zdir_patch\&.c\fR\&.
.SH "EXAMPLE"
.PP
\fBFrom zdir_patch_test method\fR. 
.sp
.if n \{\
.RS 4
.\}
.nf
const char *SELFTEST_DIR_RW = "src/selftest\-rw";

const char *testfile = "bilbo";
const char *prefix   = "/";
char *prefixed_testfile = zsys_sprintf ("%s%s", prefix, testfile);
assert (prefixed_testfile);

// Make sure old aborted tests do not hinder us
zsys_file_delete (prefixed_testfile);

zfile_t *file = zfile_new (SELFTEST_DIR_RW, testfile);
assert (file);
zdir_patch_t *patch = zdir_patch_new (SELFTEST_DIR_RW, file, patch_create, prefix);
assert (patch);
zfile_destroy (&file);

file = zdir_patch_file (patch);
assert (file);
assert (streq (zfile_filename (file, SELFTEST_DIR_RW), testfile));
assert (streq (zdir_patch_vpath (patch), prefixed_testfile));
zdir_patch_destroy (&patch);

zstr_free (&prefixed_testfile);

#if defined (__WINDOWS__)
zsys_shutdown();
#endif
.fi
.if n \{\
.RE
.\}
.sp
.SH "AUTHORS"
.sp
The czmq manual was written by the authors in the AUTHORS file\&.
.SH "RESOURCES"
.sp
Main web site: \m[blue]\fB\%\fR\m[]
.sp
Report bugs to the email <\m[blue]\fBzeromq\-dev@lists\&.zeromq\&.org\fR\m[]\&\s-2\u[1]\d\s+2>
.SH "COPYRIGHT"
.sp
Copyright (c) the Contributors as noted in the AUTHORS file\&. This file is part of CZMQ, the high\-level C binding for 0MQ: http://czmq\&.zeromq\&.org\&. This Source Code Form is subject to the terms of the Mozilla Public License, v\&. 2\&.0\&. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla\&.org/MPL/2\&.0/\&. LICENSE included with the czmq distribution\&.
.SH "NOTES"
.IP " 1." 4
zeromq-dev@lists.zeromq.org
.RS 4
\%mailto:zeromq-dev@lists.zeromq.org
.RE