| /* Copyright (C) 1993-2014 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/>. |
| |
| As a special exception, if you link the code in this file with |
| files compiled with a GNU compiler to produce an executable, |
| that does not cause the resulting executable to be covered by |
| the GNU Lesser General Public License. This exception does not |
| however invalidate any other reasons why the executable file |
| might be covered by the GNU Lesser General Public License. |
| This exception applies to code released by its copyright holders |
| in files containing the exception. */ |
| |
| #include "libioP.h" |
| #include <wchar.h> |
| #include <sys/param.h> |
| |
| wchar_t * |
| __fgetws_unlocked_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; |
| /* 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 || ((fp->_IO_file_flags & _IO_ERR_SEEN) |
| && errno != EAGAIN)) |
| result = NULL; |
| else if (count >= size) |
| __chk_fail (); |
| else |
| { |
| buf[count] = '\0'; |
| result = buf; |
| } |
| fp->_IO_file_flags |= old_error; |
| return result; |
| } |