93 lines
1.5 KiB
C
93 lines
1.5 KiB
C
#include "vof.h"
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int strlen(const char *s)
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{
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int len = 0;
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while (*s != 0) {
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len += 1;
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s += 1;
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}
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return len;
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}
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int strcmp(const char *s1, const char *s2)
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{
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while (*s1 != 0 && *s2 != 0) {
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if (*s1 != *s2) {
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break;
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}
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s1 += 1;
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s2 += 1;
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}
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return *s1 - *s2;
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}
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void *memcpy(void *dest, const void *src, size_t n)
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{
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char *cdest;
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const char *csrc = src;
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cdest = dest;
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while (n-- > 0) {
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*cdest++ = *csrc++;
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}
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return dest;
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}
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int memcmp(const void *ptr1, const void *ptr2, size_t n)
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{
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const unsigned char *p1 = ptr1;
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const unsigned char *p2 = ptr2;
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while (n-- > 0) {
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if (*p1 != *p2) {
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return *p1 - *p2;
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}
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p1 += 1;
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p2 += 1;
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}
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return 0;
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}
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void *memmove(void *dest, const void *src, size_t n)
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{
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char *cdest;
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const char *csrc;
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int i;
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/* Do the buffers overlap in a bad way? */
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if (src < dest && src + n >= dest) {
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/* Copy from end to start */
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cdest = dest + n - 1;
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csrc = src + n - 1;
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for (i = 0; i < n; i++) {
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*cdest-- = *csrc--;
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}
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} else {
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/* Normal copy is possible */
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cdest = dest;
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csrc = src;
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for (i = 0; i < n; i++) {
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*cdest++ = *csrc++;
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}
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}
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return dest;
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}
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void *memset(void *dest, int c, size_t size)
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{
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unsigned char *d = (unsigned char *)dest;
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while (size-- > 0) {
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*d++ = (unsigned char)c;
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}
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return dest;
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}
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