NAME
fgetwln — get a line of wide characters from a streamLIBRARY
library “libbsd”SYNOPSIS
#include <stdio.h>#include <wchar.h> (See libbsd(7) for include usage.)
wchar_t *
fgetwln(FILE * restrict stream, size_t * restrict len);
DESCRIPTION
The fgetwln() function returns a pointer to the next line from the stream referenced by stream. This line is not a standard wide character string as it does not end with a terminating null wide character. The length of the line, including the final newline, is stored in the memory location to which len points. (Note, however, that if the line is the last in a file that does not end in a newline, the returned text will not contain a newline.)RETURN VALUES
Upon successful completion a pointer is returned; this pointer becomes invalid after the next I/O operation on stream (whether successful or not) or as soon as the stream is closed. Otherwise,NULL
is returned. The
fgetwln() function does not distinguish between
end-of-file and error; the routines feof(3) and
ferror(3) must be used to determine which
occurred. If an error occurs, the global variable
errno is set to indicate the error. The
end-of-file condition is remembered, even on a terminal, and all subsequent
attempts to read will return NULL
until the
condition is cleared with clearerr(3).
The text to which the returned pointer points may be modified, provided that no
changes are made beyond the returned size. These changes are lost as soon as
the pointer becomes invalid.
ERRORS
- [
EBADF
] - The argument stream is not a stream open for reading.
SEE ALSO
ferror(3), fgetln(3bsd), fgetws(3), fopen(3)July 16, 2004 | Debian |