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107 lines
1.6 KiB
C
107 lines
1.6 KiB
C
#include <string.h>
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#include <types.h>
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int strcmp(const char *s1, const char *s2)
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{
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while (*s1 == *s2 && *s1 != '\0' && *s2 != '\0') {
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s1++;
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s2++;
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}
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if (*s1 != *s2) return -1;
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return 0;
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}
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int strncmp(const char *s1, const char *s2, uint32_t n)
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{
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int i;
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for (i = 0; i < n; i++) {
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if (s1[i] != s2[i]) return -1;
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if (s1[i] == s2[i] && s1[i] == '\0') break;
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}
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return 0;
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}
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char *strcpy(char *dest, const char *src)
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{
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if (!dest || !src) {
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return NULL;
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}
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while (*src != '\0') {
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*dest++ = *src++;
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}
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*dest = '\0';
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return dest;
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}
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char *strncpy(char *dest, const char *src, uint32_t n)
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{
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int i;
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int t = 0;
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if (!dest || !src || n == 0) {
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return NULL;
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}
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for (i = 0; i < n; i++) {
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if (!t) dest[i] = src[i];
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else dest[i] = '\0';
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if (dest[i] == '\0') t = 1;
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}
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return dest;
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}
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uint32_t strlen(char *s)
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{
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int i = 0;
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while (*s != '\0') {
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i++; s++;
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}
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return i;
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}
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/**
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* Copy n bytes from src to dst
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* @param dst destination buffer
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* @param src source buffer
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* @param n number of bytes to copy
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* @return number of bytes copied or value < 0 on error
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*/
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int memcpy(void *dst, const void *src, int n)
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{
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int i = 0;
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if (!dst || !src) return -1;
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for (i = 0; i < n; i++) {
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((char *)dst)[i] = ((char *)src)[i];
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}
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return i;
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}
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/**
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* strchr
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*/
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const char *strchr(const char *s, int c)
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{
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const char *ptr = s;
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if (*ptr == (char)c) return ptr;
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while (*ptr != '\0') {
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if (*(++ptr) == (char)c) {
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return ptr;
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}
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}
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return NULL;
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}
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