71 lines
1 KiB
C
71 lines
1 KiB
C
#include "types.h"
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#include "defs.h"
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void *
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memcpy(void *dst, void *src, unsigned n)
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{
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char *d = (char *) dst;
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char *s = (char *) src;
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while(n-- > 0)
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*d++ = *s++;
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return dst;
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}
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void *
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memset(void *dst, int c, unsigned n)
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{
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char *d = (char *) dst;
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while(n-- > 0)
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*d++ = c;
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return dst;
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}
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int
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memcmp(const void *v1, const void *v2, unsigned n)
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{
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const uint8_t *s1 = (const uint8_t *) v1;
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const uint8_t *s2 = (const uint8_t *) v2;
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while (n-- > 0) {
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if (*s1 != *s2)
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return (int) *s1 - (int) *s2;
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s1++, s2++;
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}
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return 0;
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}
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void *
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memmove(void *dst, const void *src, unsigned n)
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{
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const char *s;
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char *d;
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s = src;
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d = dst;
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if (s < d && s + n > d) {
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s += n;
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d += n;
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while (n-- > 0)
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*--d = *--s;
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} else
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while (n-- > 0)
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*d++ = *s++;
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return dst;
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}
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int
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strncmp(const char *p, const char *q, unsigned n)
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{
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while (n > 0 && *p && *p == *q)
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n--, p++, q++;
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if (n == 0)
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return 0;
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else
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return (int) ((unsigned char) *p - (unsigned char) *q);
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}
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