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glibc/string/argz-replace.c
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/* String replacement in an argz vector | |
Copyright (C) 1997-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Written by Miles Bader <miles@gnu.ai.mit.edu> | |
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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdlib.h> | |
#include <string.h> | |
#include <argz.h> | |
/* Append BUF, of length BUF_LEN to *TO, of length *TO_LEN, reallocating and | |
updating *TO & *TO_LEN appropriately. If an allocation error occurs, | |
*TO's old value is freed, and *TO is set to 0. */ | |
static void | |
str_append (char **to, size_t *to_len, const char *buf, const size_t buf_len) | |
{ | |
size_t new_len = *to_len + buf_len; | |
char *new_to = realloc (*to, new_len + 1); | |
if (new_to) | |
{ | |
*((char *) __mempcpy (new_to + *to_len, buf, buf_len)) = '\0'; | |
*to = new_to; | |
*to_len = new_len; | |
} | |
else | |
{ | |
free (*to); | |
*to = 0; | |
} | |
} | |
/* Replace any occurrences of the string STR in ARGZ with WITH, reallocating | |
ARGZ as necessary. If REPLACE_COUNT is non-zero, *REPLACE_COUNT will be | |
incremented by number of replacements performed. */ | |
error_t | |
__argz_replace (char **argz, size_t *argz_len, const char *str, const char *with, | |
unsigned *replace_count) | |
{ | |
error_t err = 0; | |
if (str && *str) | |
{ | |
char *arg = 0; | |
char *src = *argz; | |
size_t src_len = *argz_len; | |
char *dst = 0; | |
size_t dst_len = 0; | |
int delayed_copy = 1; /* True while we've avoided copying anything. */ | |
size_t str_len = strlen (str), with_len = strlen (with); | |
while (!err && (arg = argz_next (src, src_len, arg))) | |
{ | |
char *match = strstr (arg, str); | |
if (match) | |
{ | |
char *from = match + str_len; | |
size_t to_len = match - arg; | |
char *to = __strndup (arg, to_len); | |
while (to && from) | |
{ | |
str_append (&to, &to_len, with, with_len); | |
if (to) | |
{ | |
match = strstr (from, str); | |
if (match) | |
{ | |
str_append (&to, &to_len, from, match - from); | |
from = match + str_len; | |
} | |
else | |
{ | |
str_append (&to, &to_len, from, strlen (from)); | |
from = 0; | |
} | |
} | |
} | |
if (to) | |
{ | |
if (delayed_copy) | |
/* We avoided copying SRC to DST until we found a match; | |
now that we've done so, copy everything from the start | |
of SRC. */ | |
{ | |
if (arg > src) | |
err = __argz_append (&dst, &dst_len, src, (arg - src)); | |
delayed_copy = 0; | |
} | |
if (! err) | |
err = __argz_add (&dst, &dst_len, to); | |
free (to); | |
} | |
else | |
err = ENOMEM; | |
if (replace_count) | |
(*replace_count)++; | |
} | |
else if (! delayed_copy) | |
err = __argz_add (&dst, &dst_len, arg); | |
} | |
if (! err) | |
{ | |
if (! delayed_copy) | |
/* We never found any instances of str. */ | |
{ | |
free (src); | |
*argz = dst; | |
*argz_len = dst_len; | |
} | |
} | |
else if (dst_len > 0) | |
free (dst); | |
} | |
return err; | |
} | |
weak_alias (__argz_replace, argz_replace) |