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BTOWC(3) Library Functions Manual BTOWC(3)

convert a single byte character to a wide character

#include <wchar.h>
btowc(int c);

The btowc() 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 btowc() 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.
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