| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1993-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | As a special exception, if you link the code in this file with |
| 19 | files compiled with a GNU compiler to produce an executable, |
| 20 | that does not cause the resulting executable to be covered by |
| 21 | the GNU Lesser General Public License. This exception does not |
| 22 | however invalidate any other reasons why the executable file |
| 23 | might be covered by the GNU Lesser General Public License. |
| 24 | This exception applies to code released by its copyright holders |
| 25 | in files containing the exception. */ |
| 26 | |
| 27 | #include "libioP.h" |
| 28 | #include <wchar.h> |
| 29 | |
| 30 | wchar_t * |
| 31 | fgetws (wchar_t *buf, int n, _IO_FILE *fp) |
| 32 | { |
| 33 | _IO_size_t count; |
| 34 | wchar_t *result; |
| 35 | int old_error; |
| 36 | CHECK_FILE (fp, NULL); |
| 37 | if (n <= 0) |
| 38 | return NULL; |
| 39 | if (__glibc_unlikely (n == 1)) |
| 40 | { |
| 41 | /* Another irregular case: since we have to store a NUL byte and |
| 42 | there is only room for exactly one byte, we don't have to |
| 43 | read anything. */ |
| 44 | buf[0] = L'\0'; |
| 45 | return buf; |
| 46 | } |
| 47 | _IO_acquire_lock (fp); |
| 48 | /* This is very tricky since a file descriptor may be in the |
| 49 | non-blocking mode. The error flag doesn't mean much in this |
| 50 | case. We return an error only when there is a new error. */ |
| 51 | old_error = fp->_IO_file_flags & _IO_ERR_SEEN; |
| 52 | fp->_IO_file_flags &= ~_IO_ERR_SEEN; |
| 53 | count = _IO_getwline (fp, buf, n - 1, L'\n', 1); |
| 54 | /* If we read in some bytes and errno is EAGAIN, that error will |
| 55 | be reported for next read. */ |
| 56 | if (count == 0 || (_IO_ferror_unlocked (fp) && errno != EAGAIN)) |
| 57 | result = NULL; |
| 58 | else |
| 59 | { |
| 60 | buf[count] = '\0'; |
| 61 | result = buf; |
| 62 | } |
| 63 | fp->_IO_file_flags |= old_error; |
| 64 | _IO_release_lock (fp); |
| 65 | return result; |
| 66 | } |