91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
// source: https://gitlab.com/sortie/meaty-skeleton and https://wiki.osdev.org/Meaty_Skeleton
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#include "../headerlar/string.h"
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int memcmp(const void* aptr, const void* bptr, size_t 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 (size_t 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, size_t 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 (size_t 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, size_t 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 (size_t i = 0; i < size; i++)
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dst[i] = src[i];
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} else {
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for (size_t 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, size_t size) {
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unsigned char* buf = (unsigned char*) bufptr;
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for (size_t 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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size_t strlen(const char* str) {
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size_t 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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/*
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void examples(){
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//memory copy
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char* some = "buggy";
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char somethings[strlen(some)];
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memcpy(somethings, some, strlen(some));
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print_str(somethings);
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//memory set
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int hmm = 1;
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char any[16];
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memset(any, hmm, 8);
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print_str(any);
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//memory compare
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char* idkfe = "ad";
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char* idk = "ab";
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int cmp = memcmp(idkfe,idk,strlen(idk));
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if (cmp == 0) print_str(idk);
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if (cmp > 0) print_str("idkfe > idk");
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if (cmp < 0) print_str("idkfe < idk");
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//memory move
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char* string = "damn you nvidia";
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memmove(string+4,string,4);
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memmove(string," ",4);
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print_str(string);
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}
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*/ |