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39 lines
787 B
C
39 lines
787 B
C
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/* memcmp -- compare two memory regions.
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This function is in the public domain. */
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/*
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NAME
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memcmp -- compare two memory regions
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SYNOPSIS
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int memcmp (const void *from, const void *to, size_t count)
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DESCRIPTION
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Compare two memory regions and return less than,
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equal to, or greater than zero, according to lexicographical
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ordering of the compared regions.
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*/
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#include <ansidecl.h>
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#ifdef __STDC__
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#include <stddef.h>
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#else
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#define size_t unsigned long
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#endif
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int
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DEFUN(memcmp, (str1, str2, count),
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const PTR str1 AND const PTR str2 AND size_t count)
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{
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register unsigned char *s1 = (unsigned char*)str1;
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register unsigned char *s2 = (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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