Imported from ../bash-2.05.tar.gz.

lib/sh/strindex.c

@@ -0,0 +1,52 @@
+/* strindex.c - Find if one string appears as a substring of another string,
+		without regard to case. */
+
+/* Copyright (C) 2000
+   Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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.
+
+   Bash 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 Bash; see the file COPYING.  If not, write to the Free Software
+   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+
+#include <config.h>
+
+#include "bashansi.h"
+#include <ctype.h>
+
+#include <stdc.h>
+
+#ifndef to_upper
+#  define to_upper(c) (islower(c) ? toupper(c) : (c))
+#  define to_lower(c) (isupper(c) ? tolower(c) : (c))
+#endif
+
+/* Determine if s2 occurs in s1.  If so, return a pointer to the
+   match in s1.  The compare is case insensitive.  This is a
+   case-insensitive strstr(3). */
+char *
+strindex (s1, s2)
+     const char *s1;
+     const char *s2;
+{
+  register int i, l, len, c;
+
+  c = to_upper (s2[0]);
+  len = strlen (s1);
+  l = strlen (s2);
+  for (i = 0; (len - i) >= l; i++)
+    if ((to_upper (s1[i]) == c) && (strncasecmp (s1 + i, s2, l) == 0))
+      return ((char *)s1 + i);
+  return ((char *)0);
+}