121 lines
2.5 KiB
C
121 lines
2.5 KiB
C
//
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// Created by rick on 01-02-21.
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//
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#include <string.h>
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#include <sys/param.h>
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#include <sys/types.h>
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int memcpy(void *dst, const void *src, size_t amount) {
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for (size_t i = 0; i < amount; i++) {
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((char *) dst)[i] = ((const char *) src)[i];
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}
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return 0;
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}
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int memset(void *dst, int data, size_t amount) {
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for (size_t i = 0; i < amount; ++i) {
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((char *) dst)[i] = (char) data;
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}
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return 0;
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}
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int 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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int strncpy(char *dst, const char *src, size_t n) {
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return memcpy(dst, src, MIN(strlen(src), n) + 1);
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}
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size_t strlen(const char *str) {
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int length = 0;
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while (str[length] != 0) {
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length++;
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}
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return length;
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}
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int strcmp(const char *s1, const char *s2) {
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int len1 = strlen(s1);
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int len2 = strlen(s2);
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return strncmp(s1, s2, MAX(len1, len2));
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}
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const char *strchr(const char *s, char c) {
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int index = 0;
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while (1) {
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if (s[index] == c) {
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return &s[index];
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}
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if (s[index] == 0) {
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return NULL;
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}
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index++;
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}
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}
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const char *strrchr(const char *s, char c) {
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int index = strlen(s);
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while (1) {
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if (s[index] == c) {
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return &s[index];
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}
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if (index == 0) {
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return NULL;
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}
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index--;
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}
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}
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int memcmp(const void *s1, const void *s2, size_t n) {
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uint8_t a, b;
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for (size_t i = 0; i < n; ++i) {
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a = ((uint8_t *) s1)[i];
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b = ((uint8_t *) s2)[i];
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if (a > b) return 1;
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if (b < a) return -1;
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}
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return 0;
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}
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int strncmp(const char *s1, const char *s2, int n) {
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for (int i = 0; i < n; ++i) {
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if (s1[i] == 0 && s2[i] == 0) {
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return 0;
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}
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if (s1[i] == 0) {
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return -1;
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}
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if (s2[i] == 0) {
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return 1;
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}
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if (s1[i] > s2[i]) {
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return -1;
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}
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if (s1[i] < s2[i]) {
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return 1;
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}
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}
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return 0;
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}
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char *strcat(char *dest, const char *src) {
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size_t count = strlen(src);
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return strncat(dest, src, count);
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}
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char *strncat(char *dest, const char *src, size_t n) {
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size_t start = strlen(dest);
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for (size_t index = 0; index < n; index++) {
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char val = src[index];
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dest[start + index] = val;
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if (val == 0) {
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dest[start + index] = 0;
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break;
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}
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}
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return dest;
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}
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