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-rw-r--r--string/argz-replace.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/string/argz-replace.c b/string/argz-replace.c
new file mode 100644
index 0000000..4d658f4
--- /dev/null
+++ b/string/argz-replace.c
@@ -0,0 +1,135 @@
+/* String replacement in an argz vector
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <stdlib.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)
+ {
+ memcpy (new_to + *to_len, buf, buf_len);
+ new_to[new_len] = '\0';
+ *to = new_to;
+ *to_len = new_len;
+ }
+ else
+ {
+ free (*to);
+ *to = 0;
+ }
+}
+
+/* Replace any occurances 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. */
+ {
+ if (src)
+ free (src);
+ *argz = dst;
+ *argz_len = dst_len;
+ }
+ }
+ else if (dst_len > 0)
+ free (dst);
+ }
+
+ return err;
+}
+weak_alias (__argz_replace, argz_replace)