78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
#include <string.h>
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// Derived from musl (MIT): https://git.musl-libc.org/cgit/musl/tree/src/string/memchr.c
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void *memchr(const void *src, int c, size_t n) {
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const unsigned char *s = src;
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c = (unsigned char)c;
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for (; n && *s != c; s++, n--);
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return n ? (void *)s : 0;
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}
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int memcmp(const void *lhs, const void *rhs, size_t count) {
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const unsigned char *l = lhs;
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const unsigned char *r = rhs;
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while (count--) {
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if (*l != *r) {
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return *l - *r;
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}
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l++;
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r++;
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}
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return 0;
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}
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void *memcpy(void *restrict dst, const void *restrict src, size_t size) {
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unsigned char *d = dst;
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const unsigned char *s = src;
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while (size--) {
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*d++ = *s++;
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}
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return dst;
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}
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void *memmove(void *dst, const void *src, size_t count) {
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unsigned char *d = dst;
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const unsigned char *s = src;
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if (d < s) {
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while (count--) {
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*d++ = *s++;
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}
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} else if (d > s) {
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d += count;
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s += count;
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while (count--) {
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*(--d) = *(--s);
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}
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}
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return dst;
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}
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void *memset(void *dst, int value, size_t count) {
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unsigned char *p = dst;
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while (count--) {
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*p++ = (unsigned char)value;
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}
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return dst;
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}
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int strncmp(const char *left, const char *right, size_t n) {
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while (n-- > 0) {
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if (*left != *right) {
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return *(unsigned char *)left - *(unsigned char *)right;
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}
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if (*left == '\0') break;
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left++;
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right++;
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}
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return 0;
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}
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char *strchr(const char *str, int c) {
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while (*str != (char)c) {
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if (*str == '\0') {
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return 0;
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}
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str++;
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}
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return (char *)str;
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}
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