1 files changed, 80 insertions, 0 deletions
diff --git a/nuttx/libc/string/lib_memchr.c b/nuttx/libc/string/lib_memchr.c
new file mode 100644
index 000000000..0ac609104
--- /dev/null
+++ b/nuttx/libc/string/lib_memchr.c
@@ -0,0 +1,80 @@
+/****************************************************************************
+ * libc/string/lib_memchr.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 NuttX 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: memchr
+ *
+ * Description:
+ *   The memchr() function locates the first occurrence of 'c' (converted to
+ *   an unsigned char) in the initial 'n' bytes (each interpreted as
+ *   unsigned char) of the object pointed to by s.
+ *
+ * Returned Value:
+ *   The memchr() function returns a pointer to the located byte, or a null
+ *   pointer if the byte does not occur in the object.
+ *
+ ****************************************************************************/
+
+FAR void *memchr(FAR const void *s, int c, size_t n)
+{
+  FAR const unsigned char *p = (FAR const unsigned char *)s;
+
+  if (s)
+    {
+      while (n--)
+        {
+          if (*p == (unsigned char)c)
+            {
+              return (FAR void *)p;
+            }
+
+          p++;
+        }
+    }
+
+  return NULL;
+}