str_diff (3)

#include <str.h>

int str_diff(const char* a,const char* b);

str_diff returns negative, 0, or positive, depending on whether the string a[0], a[1], ..., a[n]=='\0' is lexicographically smaller than, equal to, or greater than the string b[0], b[1], ..., b[m-1]=='\0'.

If the strings are different, str_diff does not read bytes past the first difference.

strlen(3)