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10.1116 strcspn

POSIX specification:
https://pubs.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.