Mercurial > hg > CbC > CbC_gcc
diff libiberty/memcmp.c @ 0:a06113de4d67
first commit
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
parents | |
children | f6334be47118 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libiberty/memcmp.c Fri Jul 17 14:47:48 2009 +0900 @@ -0,0 +1,34 @@ +/* memcmp -- compare two memory regions. + This function is in the public domain. */ + +/* + +@deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, size_t @var{count}) + +Compares the first @var{count} bytes of two areas of memory. Returns +zero if they are the same, a value less than zero if @var{x} is +lexically less than @var{y}, or a value greater than zero if @var{x} +is lexically greater than @var{y}. Note that lexical order is determined +as if comparing unsigned char arrays. + +@end deftypefn + +*/ + +#include <ansidecl.h> +#include <stddef.h> + +int +memcmp (const PTR str1, const PTR str2, size_t count) +{ + register const unsigned char *s1 = (const unsigned char*)str1; + register const unsigned char *s2 = (const unsigned char*)str2; + + while (count-- > 0) + { + if (*s1++ != *s2++) + return s1[-1] < s2[-1] ? -1 : 1; + } + return 0; +} +