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#include <stddef.h>
#include <string.h>
char *strtok(char *restrict s, const char *restrict sep)
{
static _Thread_local char *state = NULL;
if (s != NULL) {
state = s;
}
if (state == NULL) {
return NULL;
}
char *token = state;
while (*token && strchr(sep, *token)) {
token++;
}
if (*token == '\0') {
state = NULL;
return NULL;
}
char *start = token;
while (*token && strchr(sep, *token) == NULL) {
token++;
}
if (*token) {
*token = '\0';
state = token + 1;
} else {
state = NULL;
}
return start;
}
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