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Diffstat (limited to 'src/memrchr.c')
-rw-r--r-- | src/memrchr.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/memrchr.c b/src/memrchr.c new file mode 100644 index 0000000..ba788f5 --- /dev/null +++ b/src/memrchr.c @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2007 Todd C. Miller <Todd.Miller@courtesan.com> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/types.h> + +/* + * Reverse memchr() + * Find the last occurrence of 'c' in the buffer 's' of size 'n'. + */ +void * +memrchr(s, c, n) + const void *s; + int c; + size_t n; +{ + const unsigned char *cp; + + if (n != 0) { + cp = (unsigned char *)s + n; + do { + if (*(--cp) == (unsigned char)c) + return((void *)cp); + } while (--n != 0); + } + return((void *)0); +} |