*Conan The Librarian
Returns the length of the prefix of a string that consists
entirely of characters not in a specified set of characters.
size_t strcspn (const char *str, const char *charset);
A pointer to a character string. If this character string is a
null string, 0 is returned.
A pointer to a character string containing the set of characters.
This function scans the characters in the string, stops when it
encounters a character found in charset, and returns the length
of the string's initial segment formed by characters not found in
If none of the characters match in the character strings pointed
to by str and charset, strcspn returns the length of string.
x The length of the segment.