174 lines
3.0 KiB
C
174 lines
3.0 KiB
C
#include "string.h"
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#include <stdbool.h>
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size_t strlen(const char *str) {
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size_t size = 0;
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while (true) {
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if (str[size] == 0) {
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return size;
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}
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++size;
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}
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return 0;
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}
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char *strcpy(char *destination, const char *source) {
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for (size_t i = 0;; ++i) {
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destination[i] = source[i];
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if (source[i] == 0) {
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return destination;
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}
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}
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return destination;
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}
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char *strncpy(char *destination, const char *source, size_t num) {
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for (size_t i = 0; i < num; ++i) {
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destination[i] = source[i];
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if (source[i] == 0) {
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return destination;
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}
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}
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return destination;
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}
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char *strcat(char *destination, const char *source) {
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size_t di = 0;
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while (destination[di] != 0) {
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++di;
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}
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for (size_t si = 0;; ++si) {
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destination[di] = source[si];
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if (source[si] == 0) {
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return destination;
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}
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++di;
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}
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return destination;
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}
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char *strstr(const char *str1, const char *str2) {
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for (size_t i1 = 0;; ++i1) {
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if (str1[i1] == 0) {
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return NULL;
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}
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for (size_t i2 = 0;; ++i2) {
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if (str2[i2] == 0) {
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return (char*)&str1[i1];
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}
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if (str1[i1 + i2] != str2[i2]) {
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break;
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}
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}
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}
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}
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int strcmp(const char *str1, const char *str2) {
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for (size_t i = 0;; ++i) {
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if (str1[i] != str2[i]) {
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return str1[i] - str2[i];
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}
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if (str1[i] == 0) {
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return 0;
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}
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}
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}
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int strncmp(const char *str1, const char *str2, size_t num) {
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for (size_t i = 0; i < num; ++i) {
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if (str1[i] != str2[i]) {
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return str1[i] - str2[i];
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}
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if (str1[i] == 0) {
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return 0;
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}
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}
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return 0;
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}
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size_t wcslen(const wchar_t *str) {
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size_t size = 0;
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while (true) {
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if (str[size] == 0) {
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return size;
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}
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++size;
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}
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return 0;
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}
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wchar_t *wcscpy(wchar_t *destination, const wchar_t *source) {
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for (size_t i = 0;; ++i) {
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destination[i] = source[i];
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if (source[i] == 0) {
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return destination;
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}
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}
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return destination;
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}
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wchar_t *wcsncpy(wchar_t *destination, const wchar_t *source, size_t num) {
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for (size_t i = 0; i < num; ++i) {
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destination[i] = source[i];
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if (source[i] == 0) {
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return destination;
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}
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}
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return destination;
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}
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wchar_t *wcscat(wchar_t *destination, const wchar_t *source) {
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size_t di = 0;
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while (destination[di] != 0) {
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++di;
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}
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for (size_t si = 0;; ++si) {
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destination[di] = source[si];
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if (source[si] == 0) {
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return destination;
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}
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++di;
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}
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return destination;
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}
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wchar_t *wcsstr(wchar_t *str1, const wchar_t *str2) {
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for (size_t i1 = 0;; ++i1) {
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if (str1[i1] == 0) {
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return NULL;
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}
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for (size_t i2 = 0;; ++i2) {
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if (str2[i2] == 0) {
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return &str1[i1];
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}
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if (str1[i1 + i2] != str2[i2]) {
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break;
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}
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}
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}
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}
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int wcscmp(const wchar_t *str1, const wchar_t *str2) {
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for (size_t i = 0;; ++i) {
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if (str1[i] != str2[i]) {
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return str1[i] - str2[i];
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}
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if (str1[i] == 0) {
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return 0;
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}
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}
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}
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int wcsncmp(const wchar_t *str1, const wchar_t *str2, size_t num) {
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for (size_t i = 0; i < num; ++i) {
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if (str1[i] != str2[i]) {
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return str1[i] - str2[i];
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}
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if (str1[i] == 0) {
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return 0;
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}
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}
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return 0;
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}
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