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missing/memcmp.c

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00001 /* public domain rewrite of memcmp(3) */
00002 
00003 #include <stddef.h>
00004 
00005 int
00006 memcmp(const void *s1, const void *s2, size_t len)
00007 {
00008     register unsigned char *a = (unsigned char*)s1;
00009     register unsigned char *b = (unsigned char*)s2;
00010     register int tmp;
00011 
00012     for (; len; --len) {
00013         if (tmp = *a++ - *b++)
00014             return tmp;
00015     }
00016     return 0;
00017 }
00018 

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