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Toy OS
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string.c (618B)

      1 #include "string.h"
      2 
      3 void *
      4 memset(void *dst, int v, size_t len)
      5 {
      6 	unsigned char *dst0;
      7 	
      8 	dst0 = dst;
      9 	while (len--)
     10 		*dst0++ = v;
     11 	return dst;
     12 }
     13 
     14 void *
     15 memcpy(void *dst, const void *src, size_t len)
     16 {
     17 	const unsigned char *src0;
     18 	unsigned char *dst0;
     19 
     20 	src0 = src;
     21 	dst0 = dst;
     22 
     23 	while (len--)
     24 		*dst0++ = *src0++;
     25 	return dst;
     26 }
     27 
     28 size_t
     29 strlen(const char *str)
     30 {
     31 	const char *s;
     32 
     33 	for (s = str; *s != '\0'; s++)
     34 		;
     35 	return (s - str);
     36 }
     37 
     38 int
     39 strcmp(const char *s1, const char *s2)
     40 {
     41 	while (*s1 == *s2++)
     42 		if (*s1++ == '\0')
     43 			return 0;
     44 	return *(const unsigned char *)s1 - *(const unsigned char *)(s2 - 1);
     45 }