Add an implementation of memmem() -- from FreeBSD with some tweaks.

Requires a libc minor bump, committing now so that we have up-to-date
snapshots for the upcoming hackathon.

joint work with millert@
man page bits ok jmc@
input and ok millert@, guenther@, deraadt@

1 files changed, 64 insertions, 0 deletions

diff --git a/src/lib/libc/string/memmem.c b/src/lib/libc/string/memmem.c
new file mode 100644
index 0000000000..b54931a9cf
--- /dev/null
+++ b/src/lib/libc/string/memmem.c
@@ -0,0 +1,64 @@
+/*      $OpenBSD: memmem.c,v 1.1 2013/05/13 10:37:02 ajacoutot Exp $ */
+/*-
+ * Copyright (c) 2005 Pascal Gloor <pascal.gloor@spale.com>
+ *
+ * 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. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/cdefs.h>
+#include <string.h>
+
+/*
+ * Find the first occurrence of the byte string s in byte string l.
+ */
+
+void *
+memmem(const void *l, size_t l_len, const void *s, size_t s_len)
+{
+        const char *cur, *last;
+        const char *cl = l;
+        const char *cs = s;
+
+        /* a zero length needle should just return the haystack */
+        if (l_len == 0)
+                return (void *)cl;
+
+        /* "s" must be smaller or equal to "l" */
+        if (l_len < s_len)
+                return NULL;
+
+        /* special case where s_len == 1 */
+        if (s_len == 1)
+                return memchr(l, *cs, l_len);
+
+        /* the last position where its possible to find "s" in "l" */
+        last = cl + l_len - s_len;
+
+        for (cur = cl; cur <= last; cur++)
+                if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
+                        return (void *)cur;
+
+        return NULL;
+}