mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/* Routines for dealing with '\0' separated arg vectors.
|
|
Copyright (C) 1995-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <argz.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
/* Insert ENTRY into ARGZ & ARGZ_LEN before BEFORE, which should be an
|
|
existing entry in ARGZ; if BEFORE is NULL, ENTRY is appended to the end.
|
|
Since ARGZ's first entry is the same as ARGZ, argz_insert (ARGZ, ARGZ_LEN,
|
|
ARGZ, ENTRY) will insert ENTRY at the beginning of ARGZ. If BEFORE is not
|
|
in ARGZ, EINVAL is returned, else if memory can't be allocated for the new
|
|
ARGZ, ENOMEM is returned, else 0. */
|
|
error_t
|
|
__argz_insert (char **argz, size_t *argz_len, char *before, const char *entry)
|
|
{
|
|
if (! before)
|
|
return __argz_add (argz, argz_len, entry);
|
|
|
|
if (before < *argz || before >= *argz + *argz_len)
|
|
return EINVAL;
|
|
|
|
if (before > *argz)
|
|
/* Make sure before is actually the beginning of an entry. */
|
|
while (before[-1])
|
|
before--;
|
|
|
|
{
|
|
size_t after_before = *argz_len - (before - *argz);
|
|
size_t entry_len = strlen (entry) + 1;
|
|
size_t new_argz_len = *argz_len + entry_len;
|
|
char *new_argz = realloc (*argz, new_argz_len);
|
|
|
|
if (new_argz)
|
|
{
|
|
before = new_argz + (before - *argz);
|
|
memmove (before + entry_len, before, after_before);
|
|
memmove (before, entry, entry_len);
|
|
*argz = new_argz;
|
|
*argz_len = new_argz_len;
|
|
return 0;
|
|
}
|
|
else
|
|
return ENOMEM;
|
|
}
|
|
}
|
|
weak_alias (__argz_insert, argz_insert)
|