Format
#include <stdio.h>
#include <wchar.h>
wint_t btowc(int c);Language Level: ANSI
Threadsafe: Yes.
Locale Sensitive: The behavior of this function might be affected by the LC_CTYPE category of the current locale. The behavior might also be affected by the LC_UNI_CTYPE category of the current locale if LOCALETYPE(*LOCALEUCS2) or LOCALETYPE(*LOCALEUTF) is specified on the compilation command. This function is not available when LOCALETYPE(*CLD) is specified on the compilation command. For more information, see Understanding CCSIDs and Locales.
Wide Character Function: See Wide Characters for more information.
Description
The btowc() function converts the single byte value c to the wide-character representation of c. If c does not constitute a valid (1-byte) multibyte character in the initial shift state, the btowc() function returns WEOF.
Return Value
The btowc() function returns WEOF if c has the value EOF, or if (unsigned char) c does not constitute a valid (1-byte) multibyte character in the initial shift state. Otherwise, it returns the wide-character representation of that character.
If a conversion error occurs, errno might be set to ECONVERT.
Example that uses btowc()
This example scans various types of data.
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <local.h>
#define UPPER_LIMIT 0xFF
int main(void)
{
int wc;
int ch;
if (NULL == setlocale(LC_ALL, "/QSYS.LIB/EN_US.LOCALE")) {
printf("Locale could not be loaded\n");
exit(1);
}
for (ch = 0; ch <= UPPER_LIMIT; ++ch) {
wc = btowc(ch);
if (wc==WEOF) {
printf("%#04x is not a one-byte multibyte character\n", ch);
} else {
printf("%#04x has wide character representation: %#06x\n", ch, wc);
}
}
wc = btowc(EOF);
if (wc==WEOF) {
printf("The character is EOF.\n", ch);
} else {
printf("EOF has wide character representation: %#06x\n", wc);
}
return 0;
}
/***********************************************************************
If the locale is bound to SBCS, the output should be similar to:
0000 has wide character representation: 000000
0x01 has wide character representation: 0x0001
...
0xfe has wide character representation: 0x00fe
0xff has wide character representation: 0x00ff
The character is EOF.
************************************************************************/Related Information