| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
XPG4 |
both |
#include <wchar.h>
int fputws(const wchar_t * __restrict__wcs, FILE * __restrict__stream);
#define _OPEN_SYS_UNLOCKED_EXT 1
#include <wchar.h>
int fputws_unlocked(const wchar_t * __restrict__wcs, FILE * __restrict__stream);Converts the wide-character string pointed to by wcs to a multibyte character string and writes it to the stream pointed to by stream, as a multibyte character string. The terminating NULL byte is not written.
The behavior of this wide-character function is affected by the LC_CTYPE category of the current locale. Using non-wide-character functions with fputws() results in undefined behavior.
fputws() has the same restriction as any write operation for a read immediately following a write or a write immediately following a read. Between a write and a subsequent read, there must be an intervening flush or reposition. Between a read and a subsequent write, there must also be an intervening flush or reposition unless an EOF has been reached.
fputws_unlocked() is functionally equivalent to fputws() with the exception that it is not thread-safe. This function can safely be used in a multithreaded application if and only if it is called while the invoking thread owns the (FILE*) object, as is the case after a successful call to either the flockfile() or ftrylockfile() function.
If successful, fputws() returns a nonnegative value.
If a stream error occurs, fputws() returns -1 and the error indicator for the stream is set.
If an encoding error occurs, fputws() returns -1 and the value of the macro EILSEQ is stored in errno. An encoding error is one that occurs when converting a wide character to a multibyte character.
⁄* CELEBF37 *⁄
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
int main(void)
{
FILE *stream;
wchar_t *wcs = L"This test string should not return -1";
int rc;
if ((stream = fopen("myfile.dat", "w")) == NULL) {
printf("Unable to open file.\n");
exit(1);
}
errno = 0;
rc = fputws(wcs, stream);
if (rc == EOF) {
printf("Unable to complete fputws() function.\n");
if (errno == EILSEQ)
printf("An invalid wide character was encountered.\n");
exit(1);
}
fclose(stream);
}