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Diffstat (limited to 'nuttx/lib/string/lib_memcmp.c')
-rw-r--r-- | nuttx/lib/string/lib_memcmp.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/nuttx/lib/string/lib_memcmp.c b/nuttx/lib/string/lib_memcmp.c new file mode 100644 index 000000000..cd874a85e --- /dev/null +++ b/nuttx/lib/string/lib_memcmp.c @@ -0,0 +1,74 @@ +/************************************************************ + * lib/string/lib_memcmp.c + * + * Copyright (C) 2007, 2011 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 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. + * + ************************************************************/ + +/************************************************************ + * Compilation Switches + ************************************************************/ + +/************************************************************ + * Included Files + ************************************************************/ + +#include <nuttx/config.h> +#include <sys/types.h> +#include <string.h> + +/************************************************************ + * Global Functions + ************************************************************/ + +#ifndef CONFIG_ARCH_MEMCMP +int memcmp(const void *s1, const void *s2, size_t n) +{ + unsigned char *p1 = (unsigned char *)s1; + unsigned char *p2 = (unsigned char *)s2; + + while (n-- > 0) + { + if (*p1 < *p2) + { + return -1; + } + else if (*p1 > *p2) + { + return 1; + } + + p1++; + p2++; + } + return 0; +} +#endif |