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FreeBSD 11.0 - man page for btowc (freebsd section 3)

BTOWC(3)						   BSD Library Functions Manual 						  BTOWC(3)

NAME
btowc, wctob -- convert between wide and single-byte characters
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <wchar.h> wint_t btowc(int c); int wctob(wint_t c); #include <wchar.h> #include <xlocale.h> wint_t btowc_l(int c, locale_t loc); int wctob_l(wint_t c, locale_t loc);
DESCRIPTION
The btowc() function converts a single-byte character into a corresponding wide character. If the character is EOF or not valid in the ini- tial shift state, btowc() returns WEOF. The wctob() function converts a wide character into a corresponding single-byte character. If the wide character is WEOF or not able to be represented as a single byte in the initial shift state, wctob() returns EOF. The _l-suffixed versions take an explicit locale argument, while the non-suffixed versions use the current global or per-thread locale.
SEE ALSO
mbrtowc(3), multibyte(3), wcrtomb(3)
STANDARDS
The btowc() and wctob() functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The btowc() and wctob() functions first appeared in FreeBSD 5.0.
BSD
February 13, 2012 BSD