diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/include/lib/string.h | 1 | ||||
| -rw-r--r-- | sys/lib/string/memcmp.c | 47 |
2 files changed, 48 insertions, 0 deletions
diff --git a/sys/include/lib/string.h b/sys/include/lib/string.h index 490ae1a..7134f18 100644 --- a/sys/include/lib/string.h +++ b/sys/include/lib/string.h @@ -40,5 +40,6 @@ void *memmove(void *s1, const void *s2, size_t n); void *memcpy(void *dest, const void *src, size_t n); void *memcpy32(void *dest, const void *src, size_t n); void *memset(void *s, int c, size_t n); +int memcmp(const void *s1, const void *s2, size_t n); #endif /* !_LIB_STRING_H_ */ diff --git a/sys/lib/string/memcmp.c b/sys/lib/string/memcmp.c new file mode 100644 index 0000000..6d8afcd --- /dev/null +++ b/sys/lib/string/memcmp.c @@ -0,0 +1,47 @@ +/* + * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team. + * All rights reserved. + * + * 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 of VegaOS 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. + */ + +/* $Id */ + +#include <string.h> + +int +memcmp(const void *s1, const void *s2, size_t n) +{ + if (n != 0) { + const unsigned char *p1 = s1, *p2 = s2; + + do { + if (*p1++ != *p2++) { + return (*--p1 - *--p2); + } + } while (--n != 0); + } + return 0; +} |