strcspn
=======

POSIX specification: http://www.opengroup.org/onlinepubs/9699919799/functions/strcspn.html

Gnulib module: strcspn

Portability problems fixed by Gnulib:

  * This function is missing on some old platforms.

Portability problems not fixed by Gnulib:

  * This function cannot work correctly on character strings in multibyte locales. Gnulib provides an alternative function mbscspn that works on character strings in all locales.