unbelievably, cygwin doesn't have strcasestr(3)

Build.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-# $MirOS: src/bin/mksh/Build.sh,v 1.78 2006/11/12 13:09:09 tg Exp $
+# $MirOS: src/bin/mksh/Build.sh,v 1.79 2006/11/12 13:15:26 tg Exp $
 #-
 # Environment: CC, CFLAGS, CPPFLAGS, LDFLAGS, LIBS, NROFF
 
@@ -257,6 +257,11 @@ ac_test setgroups setresugid 0 <<-'EOF'
 	int main(void) { gid_t gid = 0; return (setgroups(0, &gid)); }
 EOF
 
+ac_test strcasestr <<-'EOF'
+	#include <string.h>
+	int main(int ac, char *av[]) { strcasestr(av[0], av[1]); return (ac); }
+EOF
+
 ac_test strlcpy <<-'EOF'
 	#include <string.h>
 	int main(int ac, char *av[]) { strlcpy(av[0], av[1], 1); return (ac); }
@@ -264,6 +269,7 @@ EOF
 
 $e ... done.
 addsrcs HAVE_SETMODE setmode.c
+addsrcs HAVE_STRCASESTR strcasestr.c
 addsrcs HAVE_STRLCPY strlfun.c
 
 (v "cd '$srcdir' && exec $CC $CFLAGS -I'$curdir' $CPPFLAGS" \

sh.h

@@ -8,7 +8,7 @@
 /*	$OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $	*/
 /*	$OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $	*/
 
-#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.81 2006/11/12 10:44:42 tg Exp $"
+#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.82 2006/11/12 13:15:26 tg Exp $"
 #define MKSH_VERSION "R29 2006/11/12"
 
 #if HAVE_SYS_PARAM_H
@@ -124,6 +124,9 @@
 mode_t getmode(const void *, mode_t);
 void *setmode(const char *);
 #endif
+#if !HAVE_STRCASESTR
+char *strcasestr(const char *, const char *);
+#endif
 #if !HAVE_STRLCPY
 size_t strlcpy(char *, const char *, size_t);
 #endif

strcasestr.c

@@ -0,0 +1,61 @@
+/*	$OpenBSD: strcasestr.c,v 1.2 2005/08/08 08:05:37 espie Exp $	*/
+/*	$NetBSD: strcasestr.c,v 1.2 2005/02/09 21:35:47 kleink Exp $	*/
+
+/*-
+ * 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.
+ * 3. 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.
+ */
+
+#include "sh.h"
+
+__RCSID("$MirOS: src/bin/mksh/strcasestr.c,v 1.1 2006/11/12 13:15:27 tg Exp $");
+
+/*
+ * Find the first occurrence of find in s, ignore case.
+ */
+char *
+strcasestr(const char *s, const char *find)
+{
+	char c, sc;
+	size_t len;
+
+	if ((c = *find++) != 0) {
+		c = ksh_tolower((unsigned char)c);
+		len = strlen(find);
+		do {
+			do {
+				if ((sc = *s++) == 0)
+					return (NULL);
+			} while ((char)ksh_tolower((unsigned char)sc) != c);
+		} while (strncasecmp(s, find, len) != 0);
+		s--;
+	}
+	return ((char *)s);
+}