Compare two strings ignoring case.

int strcasecmp(void)

The strcasecmp() function compares the two strings s1 and s2, ignoring the case of the characters.

Returns

The strcasecmp() function returns an integer less than, equal to, or greater than zero if s1 is found, respectively, to be less than, to match, or be greater than s2. A consequence of the ordering used by strcasecmp() is that if s1 is an initial substring of s2, then s1 is considered to be "less than" s2.