Initial checkin

1 files changed, 134 insertions, 0 deletions

diff --git a/libshouldbeinlibc/argz-replace.c b/libshouldbeinlibc/argz-replace.c
new file mode 100644
index 00000000..0a0dcdf9
--- /dev/null
+++ b/libshouldbeinlibc/argz-replace.c
@@ -0,0 +1,134 @@
+/* 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;
+}