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#include <string.h>
size_t strlen(const char* str) {
size_t ret = 0;
while (str[ret] != 0)
ret++;
return ret;
}
char *strchr(const char *str, char c) {
while (*str) {
if (*str == c) return (char*)str;
str++;
}
return NULL;
}
char *strcpy(char *dest, const char *src) {
memcpy(dest, src, strlen(src) + 1);
return (char*)src;
}
char *strcat(char *dest, const char *src) {
char *dest2 = dest;
dest2 += strlen(dest) - 1;
while (*src) {
*dest2 = *src;
src++;
dest2++;
}
*dest2 = 0;
return dest;
}
int strcmp(const char *s1, const char *s2) {
while ((*s1) && (*s1 == *s2)) {
s1++;
s2++;
}
return (*(unsigned char*)s1 - *(unsigned char*)s2);
}
void *memcpy(void *vd, const void *vs, size_t count) {
uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
size_t f = count % 4, n = count / 4, i;
const uint32_t* s = (uint32_t*)src;
uint32_t* d = (uint32_t*)dest;
for (i = 0; i < n; i++) {
d[i] = s[i];
}
if (f != 0) {
for (i = count - f; i < count; i++) {
dest[i] = src[i];
}
}
return vd;
}
void *memmove(void *vd, const void *vs, size_t count) {
uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
if (vd < vs) {
for (size_t i = 0; i < count; i++)
dest[i] = src[i];
} else {
for (size_t i = 0; i < count; i++)
dest[count - i] = src[count - i];
}
return vd;
}
int memcmp(const void *va, const void *vb, size_t count) {
uint8_t *a = (uint8_t*)va;
uint8_t *b = (uint8_t*)vb;
for (size_t i = 0; i < count; i++) {
if (a[i] != b[i]) return (int)a[i] - (int)b[i];
}
return 0;
}
void *memset(void *dest, int val, size_t count) {
uint8_t *dest_c = (uint8_t*)dest;
for (size_t i = 0; i < count; i++) {
dest_c[i] = val;
}
return dest;
}
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