7.24.6.1.1 The btowc function

Synopsis

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

Description

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The btowc function determines whether c constitutes a valid single-byte character in the initial shift state.

Returns

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The btowc function returns WEOF if c has the value EOF or if (unsigned char)c does not constitute a valid single-byte character in the initial shift state. Otherwise, it returns the wide character representation of that character.