> it writes zeros to the input array [which] means it's unfit for most use cases[...] Other issues with strtok() aside, this seems like a silly reason to disco

> it writes zeros to the input array [which] means it's unfit for most use cases[...] Other issues with strtok() aside, this seems like a silly reason to discount a standard library function. If you don't want your input munged you can strdup() it. It's rare to find a C program that's so specialized that the performance hit of a strdup() would be unacceptable in a case where strtok() could otherwise have been used.