CrossWorks for ARM User Guide

strtok then searches from there for a character that is contained in the current separatorstring. If no such character is found, the current token extends to the end of the stringpointed to by s1, and subsequent searches for a token will return a null pointer. If sucha character is found, it is overwritten by a null character, which terminates the currenttoken. strtok saves a pointer to the following character, from which the next search fora token will start.Each subsequent call, with a null pointer as the value of the first argument, startssearching from the saved pointer and behaves as described above.Portabilitystrtok conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).318 Chapter 28 Standard C Library Reference