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35 lines
876 B
35 lines
876 B
/* memcmp -- compare two memory regions. |
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This function is in the public domain. */ |
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/* |
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@deftypefn Supplemental int memcmp (const void *@var{x}, const void *@var{y}, @ |
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size_t @var{count}) |
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Compares the first @var{count} bytes of two areas of memory. Returns |
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zero if they are the same, a value less than zero if @var{x} is |
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lexically less than @var{y}, or a value greater than zero if @var{x} |
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is lexically greater than @var{y}. Note that lexical order is determined |
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as if comparing unsigned char arrays. |
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@end deftypefn |
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*/ |
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#include <ansidecl.h> |
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#include <stddef.h> |
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int |
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memcmp (const PTR str1, const PTR str2, size_t count) |
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{ |
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register const unsigned char *s1 = (const unsigned char*)str1; |
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register const unsigned char *s2 = (const unsigned char*)str2; |
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while (count-- > 0) |
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{ |
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if (*s1++ != *s2++) |
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return s1[-1] < s2[-1] ? -1 : 1; |
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} |
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return 0; |
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} |
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