DIX: Add strcasestr from FreeBSD

Add strcasestr for use on systems which don't have it.
(cherry picked from ad87c72edc commit)

configure.ac

@@ -1018,6 +1018,8 @@ AC_CHECK_FUNC(strcasecmp, [], AC_DEFINE([NEED_STRCASECMP], 1,
                                         [Do not have 'strcasecmp'.]))
 AC_CHECK_FUNC(strncasecmp, [], AC_DEFINE([NEED_STRNCASECMP], 1,
                                         [Do not have 'strncasecmp'.]))
+AC_CHECK_FUNC(strcasestr, [], AC_DEFINE([NEED_STRCASESTR], 1,
+                                       [Do not have 'strcasestr'.]))
 
 if test "x$NULL_ROOT_CURSOR" = xyes; then
         AC_DEFINE(NULL_ROOT_CURSOR, 1, [Use an empty root cursor])

dix/Makefile.am

@@ -40,7 +40,8 @@ libdix_la_SOURCES = 	\
 	swapreq.c	\
 	tables.c	\
 	window.c	\
-	strcasecmp.c
+	strcasecmp.c	\
+	strcasestr.c
 
 libxpstubs_la_SOURCES =	\
 	xpstubs.c

dix/strcasestr.c

@@ -0,0 +1,64 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <ctype.h>
+#include <string.h>
+#include "dix.h"
+
+/*
+ * Find the first occurrence of find in s, ignore case.
+ */
+#ifdef NEED_STRCASESTR
+char *
+xstrcasestr(const char *s, const char *find)
+{
+        char c, sc;
+        size_t len;
+
+        if ((c = *find++) != 0) {
+                c = tolower((unsigned char)c);
+                len = strlen(find);
+                do {
+                        do {
+                                if ((sc = *s++) == 0)
+                                        return (NULL);
+                        } while ((char)tolower((unsigned char)sc) != c);
+                } while (strncasecmp(s, find, len) != 0);
+                s--;
+        }
+        return ((char *)s);
+}
+#endif

include/dix-config.h.in

@@ -521,4 +521,7 @@
 /* Need the strncasecmp function. */
 #undef NEED_STRNCASECMP
 
+/* Need the strcasestr function. */
+#undef NEED_STRCASESTR
+
 #endif /* _DIX_CONFIG_H_ */

include/dix.h

@@ -564,6 +564,11 @@ extern int xstrcasecmp(const char *s1, const char *s2);
 extern int xstrncasecmp(const char *s1, const char *s2, size_t n);
 #endif
 
+#if NEED_STRCASESTR
+#define strcasestr xstrcasestr
+extern int xstrcasestr(const char *s, const char *find);
+#endif
+
 /*
  * These are deprecated compatibility functions and will be removed soon!
  * Please use the noted replacements instead.