Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 134 insertions, 0 deletions

diff --git a/REORG.TODO/string/argz-replace.c b/REORG.TODO/string/argz-replace.c
new file mode 100644
index 0000000000..6464e9bdbb
--- /dev/null
+++ b/REORG.TODO/string/argz-replace.c
@@ -0,0 +1,134 @@
+/* String replacement in an argz vector
+   Copyright (C) 1997-2017 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)