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BTOWC(3) Library Functions Manual BTOWC(3)

btowcconvert a single byte character to a wide character

#include <wchar.h>

wint_t
btowc(int c);

The () function converts a single byte character c in the initial shift state of the current locale to a corresponding wide character.

The behaviour of the () is affected by the LC_CTYPE category of the current locale.

The btowc() function returns:

If c is EOF or if (unsigned char) c does not correspond to a valid single byte character representation.
(otherwise)
A wide character corresponding to c.

No errors are defined.

mbrtowc(3), setlocale(3), wctob(3)

The btowc() function conforms to ISO/IEC 9899/AMD1:1995 (“ISO C90, Amendment 1”).

June 5, 2013 OpenBSD-current