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#include <stdio.h> #include <wchar.h> wint_t btowc(int c);
#include <stdio.h> #include <wchar.h> #include <xlocale.h> wint_t btowc_l(int c, locale_t loc);
The btowc() and btowc_l()functions determines whether c constitutes a valid (one-byte) character in the initial shift state.
The behavior of btowc() is affected by the LC_CTYPE category of the current locale. See environ(5). The function btowc_l() does not use the current locale, and instead operates on the locale specified by loc.
The btowc() function returns WEOF if c has the value EOF or if (unsigned char)c does not constitute a valid (one-byte) character in the initial shift state. Otherwise, it returns the wide-character representation of that character.
No errors are defined.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability See below. |
| MT-Level MT-Safe |
The btowc() function is Standard. The btowc_l() function is Uncommitted.
newlocale(3C), setlocale(3C), uselocale(3C), wctob(3C), attributes(5), environ(5), standards(5)