char *find_char0(char const *source, char const *chars) {
if (source == NULL || chars == NULL) {
return NULL;
}
char const *sc1, *sc2;
for (sc1 = source; *sc1 != '\0'; ++sc1) {
for (sc2 = chars; *sc2 != '\0'; ++sc2) {
if (*sc1 == *sc2) {
return (char *)sc1;
}
}
}
return NULL;
}
char *strcpy_(char *dest, const char *src){
char *ret = dest;
assert(dest != NULL);
while ((*dest++ = *src++)) {
;
}
return ret;
}
char *strcat_(char *dest, const char *src) {
char *ret = dest;
assert(dest != NULL);
assert(src != NULL);
while (*dest != '\0') {
dest++;
}
while ((*dest ++ = *src++)) {
;
}
return ret;
}
char *strstr_(const char *str, const char *substr){
assert(str != NULL);
assert(substr != NULL);
if (*substr == '\0') {
return str;
}
while (*str) {
const char *s1 = str;
const char *s2 = substr;
while (*s1 && *s2 && *s1 == *s2) {
s1++;
s2++;
}
if (*s2 == '\0') {
return str;
}
str++;
}
return NULL;
}
int strcmp_(const char* str1, const char *str2){
assert(str1 != NULL);
assert(str2 != NULL);
while (*str1 == *str2) {
if (*str1 == '\0') {
return 0;
}
str1++;
str2++;
}
return *str1 - *str2;
}
char *memcpy_(void *dest, const void *src, size_t count) {
void *ret = dest;
assert(dest != NULL);
assert(src != NULL);
while (count) {
*(char*)dest = *(char*)src;
dest = (char*)dest+1;
src = (char*)src+1;
count--;
}
return ret;
}
void *memmove_(void *dest, void *src, size_t count) {
void *ret = dest;
char *str1 = (char*)dest;
char *str2 = (char*)src;
assert(dest != NULL);
assert(src != NULL);
if (str1 > str2) {
while (count--) {
*(str1 + count) = *(str2 + count);
}
}else {
while (count--) {
*str1++ = *str2++;
}
}
return ret;
}
void *strrev(char *s) {
char *h = s;
char *t = s;
char ch;
while(*t++){};
t--;
t--;
while (h<t) {
ch = *h;
*h++ = *t;
*t-- = ch;
}
return s;
}
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