NAME

fgetwc, fgetwc_l - get a wide-character code from a stream

SYNOPSIS

#include <stdio.h>
#include <wchar.h>
wint_t fgetwc(FILE *stream);

#include <stdio.h>
#include <wchar.h>
#include <xlocale.h>
wint_t fgetwc_l(FILE *stream, locale_t, loc);

DESCRIPTION

The fgetwc() and fgetwc_l() functions obtain the next character (if present) from the input stream pointed to by stream, convert that to the corresponding wide-character code and advance the associated file position indicator for the stream (if defined). Whereas fgetwc() uses the current locale, fgetwc_l() uses the locale specified by loc.

If an error occurs, the resulting value of the file position indicator for the stream is indeterminate.

The fgetwc() and fgetwc_l() functions may mark the st_atime field of the file associated with stream for update. The st_atime field will be marked for update by the first successful execution of fgetwc(), fgetc(3C), fgets(3C), fgetws(3C), fread(3C), fscanf(3C), getc(3C), getchar(3C), gets(3C), or scanf(3C) using stream that returns data not supplied by a prior call to ungetc(3C) or ungetwc(3C).

RETURN VALUES

Upon successful completion both functions return the wide-character code of the character read from the input stream pointed to by stream converted to a type wint_t.

For standard-conforming (see standards(7)) applications, if the end-of-file indicator for the stream is set, fgetwc() and fgetwc_l() return WEOF whether or not the stream is at end-of-file.

If a read error occurs, the error indicator for the stream is set, fgetwc() and fgetwc_l() returns WEOF and sets errno to indicate the error.

If an encoding error occurs, the error indicator for the stream is set, fgetwc() and fgetwc_l() return WEOF, and errno is set to indicate the error.

ERRORS

The fgetwc() and fgetwc_l() functions will fail if data needs to be read and:

EAGAIN: The O_NONBLOCK flag is set for the file descriptor underlying stream and the process would be delayed in the fgetwc() or fgetwc_l() operation.
EBADF: The file descriptor underlying stream is not a valid file descriptor open for reading.
EINTR: The read operation was terminated due to the receipt of a signal, and no data was transferred.
EIO: A physical I/O error has occurred, or the process is in a background process group attempting to read from its controlling terminal and either the process is ignoring or blocking the SIGTTIN signal or the process group is orphaned.
EOVERFLOW: The file is a regular file and an attempt was made to read at or beyond the offset maximum associated with the corresponding stream.

The fgetwc() and fgetwc_l() functions may fail if:

ENOMEM: Insufficient memory is available.
ENXIO: A request was made of a non-existent device, or the request was outside the capabilities of the device.
EILSEQ: The data obtained from the input stream does not form a valid character.

USAGE

The ferror(3C) or feof(3C) functions must be used to distinguish between an error condition and an end-of-file condition.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
CSI	Enabled
Interface Stability	See below.
MT-Level	MT-Safe

The fgetwc() function is Standard. The fgetwc_l() function is Uncommitted.