58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#include <std/string.h>
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int memcmp(const void* aptr, const void* bptr, usize size) {
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const unsigned char* a = (const unsigned char*) aptr;
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const unsigned char* b = (const unsigned char*) bptr;
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for (usize i = 0; i < size; i++) {
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if (a[i] < b[i])
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return -1;
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else if (b[i] < a[i])
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return 1;
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}
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return 0;
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}
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void* memcpy(void* restrict dstptr, const void* restrict srcptr, usize size) {
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unsigned char* dst = (unsigned char*) dstptr;
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const unsigned char* src = (const unsigned char*) srcptr;
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for (usize i = 0; i < size; i++)
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dst[i] = src[i];
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return dstptr;
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}
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void* memmove(void* dstptr, const void* srcptr, usize size) {
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unsigned char* dst = (unsigned char*) dstptr;
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const unsigned char* src = (const unsigned char*) srcptr;
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if (dst < src) {
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for (usize i = 0; i < size; i++)
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dst[i] = src[i];
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} else {
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for (usize i = size; i != 0; i--)
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dst[i-1] = src[i-1];
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}
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return dstptr;
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}
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void* memset(void* bufptr, int value, usize size) {
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unsigned char* buf = (unsigned char*) bufptr;
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for (usize i = 0; i < size; i++)
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buf[i] = (unsigned char) value;
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return bufptr;
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}
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usize strlen(const char* str) {
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usize len = 0;
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while (str[len])
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len++;
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return len;
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}
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char* strcpy(char* dst, const char* src) {
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return memcpy(dst, src, strlen(src) + 1);
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}
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char* strcat(char* dst, const char* src) {
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strcpy(dst + strlen(dst), src);
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return dst;
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}
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