A handy function for splitting a string into substrings is

        char * strtok(char *str1, const char *delims);
     

The strtok function returns a pointer to the next .token. in str1, where str2 contains the delimiters that determine the token. strtok returns NULL if no token is found.

In order to convert a string to tokens, the first call to strtok should have str1 point to the string to be tokenized. All calls afterwards should have str1 be NULL.