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int toascii(int c);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
toascii(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE
toascii() converts c to a 7-bit unsigned char value that fits into the
ASCII character set, by clearing the high-order bits.
The value returned is that of the converted character.
Multithreading (see pthreads(7))
The toascii() function is thread-safe.
SVr4, BSD, POSIX.1-2001. POSIX.1-2008 marks toascii() as obsolete,
noting that it cannot be used portably in a localized application.
Many people will be unhappy if you use this function. This function
will convert accented letters into random characters.
isascii(3), tolower(3), toupper(3)
GNU 2013-12-23 TOASCII(3)