1 /* String replacement in an argz vector
2 Copyright (C) 1997, 1998, 2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Written by Miles Bader <miles@gnu.ai.mit.edu>
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 /* Append BUF, of length BUF_LEN to *TO, of length *TO_LEN, reallocating and
26 updating *TO & *TO_LEN appropriately. If an allocation error occurs,
27 *TO's old value is freed, and *TO is set to 0. */
29 str_append (char **to, size_t *to_len, const char *buf, const size_t buf_len)
31 size_t new_len = *to_len + buf_len;
32 char *new_to = realloc (*to, new_len + 1);
36 *((char *) __mempcpy (new_to + *to_len, buf, buf_len)) = '\0';
47 /* Replace any occurrences of the string STR in ARGZ with WITH, reallocating
48 ARGZ as necessary. If REPLACE_COUNT is non-zero, *REPLACE_COUNT will be
49 incremented by number of replacements performed. */
51 __argz_replace (char **argz, size_t *argz_len, const char *str, const char *with,
52 unsigned *replace_count)
60 size_t src_len = *argz_len;
63 int delayed_copy = 1; /* True while we've avoided copying anything. */
64 size_t str_len = strlen (str), with_len = strlen (with);
66 while (!err && (arg = argz_next (src, src_len, arg)))
68 char *match = strstr (arg, str);
71 char *from = match + str_len;
72 size_t to_len = match - arg;
73 char *to = __strndup (arg, to_len);
77 str_append (&to, &to_len, with, with_len);
80 match = strstr (from, str);
83 str_append (&to, &to_len, from, match - from);
84 from = match + str_len;
88 str_append (&to, &to_len, from, strlen (from));
97 /* We avoided copying SRC to DST until we found a match;
98 now that we've done so, copy everything from the start
102 err = __argz_append (&dst, &dst_len, src, (arg - src));
106 err = __argz_add (&dst, &dst_len, to);
115 else if (! delayed_copy)
116 err = __argz_add (&dst, &dst_len, arg);
122 /* We never found any instances of str. */
129 else if (dst_len > 0)
135 weak_alias (__argz_replace, argz_replace)