Add strncmp()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@385 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 71 insertions, 5 deletions

diff --git a/nuttx/lib/Makefile b/nuttx/lib/Makefile
index 8f595fdd6..5f08c7564 100644
--- a/nuttx/lib/Makefile
+++ b/nuttx/lib/Makefile
@@ -1,5 +1,5 @@
 ############################################################################
-# Makefile
+# lib/Makefile
 #
 #   Copyright (C) 2007 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
@@ -45,10 +45,11 @@ ifneq ($(CONFIG_NFILE_STREAMS),0)
 MISC_SRCS	+= lib_streamsem.c
 endif
 
-STRING_SRCS	= lib_memset.c lib_memcpy.c lib_memcmp.c lib_memmove.c lib_strcpy.c \
-		  lib_strncpy.c lib_strcmp.c lib_strlen.c lib_strdup.c lib_strtol.c lib_strchr.c \
-		  lib_strrchr.c lib_strspn.c lib_strcspn.c lib_strtok.c lib_strtokr.c \
-		  lib_strerror.c
+STRING_SRCS	= lib_memset.c lib_memcpy.c lib_memcmp.c lib_memmove.c \
+		  lib_strcpy.c lib_strncpy.c lib_strcmp.c lib_strncmp.c \
+		  lib_strlen.c lib_strdup.c lib_strtol.c lib_strchr.c \
+		  lib_strrchr.c lib_strspn.c lib_strcspn.c lib_strtok.c \
+		  lib_strtokr.c lib_strerror.c
 
 CTYPE_SRCS	= 
 
diff --git a/nuttx/lib/lib_strncmp.c b/nuttx/lib/lib_strncmp.c
new file mode 100644
index 000000000..1153dfd87
--- /dev/null
+++ b/nuttx/lib/lib_strncmp.c
@@ -0,0 +1,65 @@
+/************************************************************
+ * lib_strncmp.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 Gregory Nutt 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.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+#include <string.h>
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+#ifndef CONFIG_ARCH_STRNCMP
+int strncmp(const char *cs, const char *ct, size_t nb)
+{
+  register signed char result = 0;
+  for (; nb > 0; nb--)
+    {
+      if ((result = *cs - *ct++) != 0 || !*cs++)
+        {
+          break;
+        }
+    }
+  return result;
+}
+#endif