How to split a const char *?

Question

I have a const char* which represents a path I want to split it into an array of strings at character / so I can do the search step by step.

I tried doing

char* str2 = strtok(str1,"/")

but my compiler returns a

warning: initialization discards 'const' qualifier from pointer target type

How can I do the split without any warning?

Answer 1

strtok(3) and strtok_r(3) mutate the string in place, which prevents you from passing a const string. You will want to pass a copy anyway, as you don't want your initial string to be mutated and become unusable.

Here's how you can do it with strdup(3) :

char* strtmp = strdup(str1);
char* str2 = strtok(strtmp,"/");
// Use str2 here
free(strtmp);