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Defined in header <wchar.h> | ||
wint_t btowc(int c); | (since C95) | |
Widens a single-byte characterc (reinterpreted asunsignedchar) to its wide character equivalent.
Most multibyte character encodings use single-byte codes to represent the characters from the ASCII character set. This function may be used to convert such characters towchar_t.
Contents |
| c | - | single-byte character to widen |
WEOF ifc isEOF
wide character representation ofc if(unsignedchar)c is a valid single-byte character in the initial shift state,WEOF otherwise.
#include <stdio.h>#include <wchar.h>#include <locale.h>#include <assert.h> void try_widen(unsignedchar c){ wint_t w= btowc(c);if(w!= WEOF)printf("The single-byte character %#x widens to %#x\n", c, w);elseprintf("The single-byte character %#x failed to widen\n", c);} int main(void){char*loc=setlocale(LC_ALL,"lt_LT.iso88594");assert(loc);printf("In Lithuanian ISO-8859-4 locale:\n"); try_widen('A'); try_widen('\xdf');// German letter ß (U+00df) in ISO-8859-4 try_widen('\xf9');// Lithuanian letter ų (U+0173) in ISO-8859-4 setlocale(LC_ALL,"lt_LT.utf8");printf("In Lithuanian UTF-8 locale:\n"); try_widen('A'); try_widen('\xdf'); try_widen('\xf9');}
Possible output:
In Lithuanian ISO-8859-4 locale:The single-byte character 0x41 widens to 0x41The single-byte character 0xdf widens to 0xdfThe single-byte character 0xf9 widens to 0x173In Lithuanian UTF-8 locale:The single-byte character 0x41 widens to 0x41The single-byte character 0xdf failed to widenThe single-byte character 0xf9 failed to widen
(C95) | narrows a wide character to a single-byte narrow character, if possible (function)[edit] |
C++ documentation forbtowc | |
