* memmem.cc: New file.

* include/cygwin/version.h: Bump API version number to 142. * cygwin.din: Export memmem.
2005-11-08 22:08:39 +00:00
parent 1f99dd3ecf
commit 42cd8528aa
5 changed files with 79 additions and 3 deletions
--- a/winsup/cygwin/libc/memmem.cc
+++ b/winsup/cygwin/libc/memmem.cc
@ -0,0 +1,67 @@
+/*-
+ * 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>
+#if 0
+__FBSDID("$FreeBSD: src/lib/libc/string/memmem.c,v 1.1 2005/08/25 18:26:58 andre Exp $");
+#endif
+
+#include <string.h>
+
+/*  Find the first occurrence of the byte string s in byte string l.
+ */
+
+extern "C" void *
+memmem (const void *l, size_t l_len,
+	const void *s, size_t s_len)
+{
+  register char *cur, *last;
+  const char *cl = (const char *)l;
+  const char *cs = (const char *)s;
+
+  /* we need something to compare */
+  if (l_len == 0 || s_len == 0)
+    return NULL;
+
+  /* "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, (int) *cs, l_len);
+
+  /* the last position where its possible to find "s" in "l" */
+  last = (char *) cl + l_len - s_len;
+
+  for (cur = (char *) cl; cur <= last; cur++)
+    if (cur[0] == cs[0] && memcmp (cur, cs, s_len) == 0)
+      return cur;
+
+  return NULL;
+}