diff options
author | Ian Moffett <ian@osmora.org> | 2024-06-04 14:56:28 -0400 |
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committer | Ian Moffett <ian@osmora.org> | 2024-06-04 14:56:28 -0400 |
commit | 54096dae0fd8ae38161caa27c76355657a1bcf84 (patch) | |
tree | fd68bc2e31f096ae76f12db0c7513a092537523f /sys/lib/string | |
parent | 758ffd773a962c3d2e3f95f0d342d5b5d4ea6f08 (diff) |
kernel: lib: Add memcmp()
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/lib/string')
-rw-r--r-- | sys/lib/string/memcmp.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sys/lib/string/memcmp.c b/sys/lib/string/memcmp.c new file mode 100644 index 0000000..fb6eeaf --- /dev/null +++ b/sys/lib/string/memcmp.c @@ -0,0 +1,45 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora 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 Hyra 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. + */ + +#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; +} |