1 files changed, 87 insertions, 0 deletions
diff --git a/contrib/diff/prepend_args.c b/contrib/diff/prepend_args.c
new file mode 100644
index 0000000..5dee55e
--- /dev/null
+++ b/contrib/diff/prepend_args.c
@@ -0,0 +1,87 @@
+/* prepend_args.c - utilility programs for manpiulating argv[]
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA.  */
+
+/* $FreeBSD$ */
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include "system.h"
+#include "diff.h"
+#include "prepend_args.h"
+
+
+/* Find the white-space-separated options specified by OPTIONS, and
+   using BUF to store copies of these options, set ARGV[0], ARGV[1],
+   etc. to the option copies.  Return the number N of options found.
+   Do not set ARGV[N] to NULL.  If ARGV is NULL, do not store ARGV[0]
+   etc.  Backslash can be used to escape whitespace (and backslashes).  */
+static int
+prepend_args (options, buf, argv)
+     char const *options;
+     char *buf;
+     char **argv;
+{
+  char const *o = options;
+  char *b = buf;
+  int n = 0;
+
+  for (;;)
+    {
+      while (ISSPACE ((unsigned char) *o))
+	o++;
+      if (!*o)
+	return n;
+      if (argv)
+	argv[n] = b;
+      n++;
+
+      do
+	if ((*b++ = *o++) == '\\' && *o)
+	  b[-1] = *o++;
+      while (*o && ! ISSPACE ((unsigned char) *o));
+
+      *b++ = '\0';
+    }
+}
+
+/* Prepend the whitespace-separated options in OPTIONS to the argument
+   vector of a main program with argument count *PARGC and argument
+   vector *PARGV.  */
+void
+prepend_default_options (options, pargc, pargv)
+     char const *options;
+     int *pargc;
+     char ***pargv;
+{
+  if (options)
+    {
+      char *buf = xmalloc (strlen (options) + 1);
+      int prepended = prepend_args (options, buf, (char **) NULL);
+      int argc = *pargc;
+      char * const *argv = *pargv;
+      char **pp = (char **) xmalloc ((prepended + argc + 1) * sizeof *pp);
+      *pargc = prepended + argc;
+      *pargv = pp;
+      *pp++ = *argv++;
+      pp += prepend_args (options, buf, pp);
+      while ((*pp++ = *argv++))
+	continue;
+    }
+}