C - Determining which delimiter used - strtok()

Question

Let\'s say I\'m using strtok() like this..

char *token = strtok(input, \";-/\");

Is there a way to figure out which token actually

Answer 1

man 3 strtok

The strtok() and strtok_r() functions return a pointer to the beginning of each subsequent token in the string, after replacing the token itself with a NUL character. When no more tokens remain, a null pointer is returned.

But with a little pointer arithmetic you can do something like:

char* string = "Hello,World!";
char* dup = strdup(string);

char* world = strtok(string, ",");
char delim_used = dup[world - string];

free(dup);