1 files changed, 38 insertions, 0 deletions

diff --git a/src/lib/libc/string/memrchr.c b/src/lib/libc/string/memrchr.c
new file mode 100644
index 0000000000..bd27ebc620
--- /dev/null
+++ b/src/lib/libc/string/memrchr.c
@@ -0,0 +1,38 @@
+/*      $OpenBSD: memrchr.c,v 1.2 2007/11/27 16:22:12 martynas Exp $    */
+
+/*
+ * Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+
+/*
+ * Reverse memchr()
+ * Find the last occurrence of 'c' in the buffer 's' of size 'n'.
+ */
+void *
+memrchr(const void *s, int c, size_t n)
+{
+        const unsigned char *cp;
+
+        if (n != 0) {
+                cp = (unsigned char *)s + n;
+                do {
+                        if (*(--cp) == (unsigned char)c)
+                                return((void *)cp);
+                } while (--n != 0);
+        }
+        return(NULL);
+}