Format
#include <wchar.h> int fputws(const wchar_t *wcs, FILE *stream);
Language Level: ANSI, XPG4
fputws converts the wide-character string wcs to a
multibyte-character string and writes it to stream as
a multibyte character string. It does not write the terminating
null byte.
The behavior of fputws is affected by the LC_CTYPE category of the current locale. If you change the category between subsequent operations on the same stream, undefined results can occur. Using non-wide-character functions with fputws on the same stream results in undefined behavior.
After calling fputws, flush the buffer or reposition the stream pointer before calling a read function for the stream. After a read operation, flush the buffer or reposition the stream pointer before calling fputws, unless EOF has been reached.
Return Value
fputws returns a non-negative value if successful. If a
write error occurs, the error indicator for the stream is set and
fputws returns -1. If an encoding error occurs in converting the
wide characters to multibyte characters, fputws sets errno to
EILSEQ and returns -1.
Example
This example opens a file and writes a wide-character
string to the file using fgetws.
#include <stdio.h> #include <stdlib.h> #include <wchar.h> #include <errno.h>
int main(void)
{
FILE *stream;
wchar_t *wcs = L"This test string should not return -1";
if (NULL == (stream = fopen("fputws.out", "w"))) {
printf("Unable to open: \"fputws.out\".\n");
exit(1);
}
errno = 0;
if (EOF == fputws(wcs, stream)) {
printf("Unable to complete fputws() function.\n");
if (EILSEQ == errno)
printf("An invalid wide character was encountered.\n");
exit(1);
}
fclose(stream);
return 0;
/************************************************************
The output file fputws.out should contain:
This test string should not return -1 ************************************************************/ }
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fgetws -- Read Wide-Character String from
Stream
fputs -- Write String
fputwc -- Write Wide Character
<stdio.h>
<wchar.h>