/* Copyright (C) 1993-2013 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include "libioP.h" #include <wchar.h> #include <sys/param.h> wchar_t * __fgetws_chk (wchar_t *buf, size_t size, int n, _IO_FILE *fp) { _IO_size_t count; wchar_t *result; int old_error; CHECK_FILE (fp, NULL); if (n <= 0) return NULL; _IO_acquire_lock (fp); /* This is very tricky since a file descriptor may be in the non-blocking mode. The error flag doesn't mean much in this case. We return an error only when there is a new error. */ old_error = fp->_IO_file_flags & _IO_ERR_SEEN; fp->_IO_file_flags &= ~_IO_ERR_SEEN; count = _IO_getwline (fp, buf, MIN ((size_t) n - 1, size), L'\n', 1); /* If we read in some bytes and errno is EAGAIN, that error will be reported for next read. */ if (count == 0 || (_IO_ferror_unlocked (fp) && errno != EAGAIN)) result = NULL; else if (count >= size) __chk_fail (); else { buf[count] = '\0'; result = buf; } fp->_IO_file_flags |= old_error; _IO_release_lock (fp); return result; }