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d4697bc9 | 1 | /* Copyright (C) 1993-2014 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
77ccaba1 | 3 | |
41bdb6e2 AJ |
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. | |
77ccaba1 | 8 | |
41bdb6e2 AJ |
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 | |
77ccaba1 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
77ccaba1 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
77ccaba1 | 17 | |
41bdb6e2 AJ |
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. */ | |
77ccaba1 UD |
26 | |
27 | #include "libioP.h" | |
28 | #include <stdio.h> | |
29 | ||
30 | char * | |
31 | fgets_unlocked (buf, n, fp) | |
32 | char *buf; | |
33 | int n; | |
34 | _IO_FILE *fp; | |
35 | { | |
36 | _IO_size_t count; | |
37 | char *result; | |
38 | int old_error; | |
39 | CHECK_FILE (fp, NULL); | |
40 | if (n <= 0) | |
41 | return NULL; | |
a1ffb40e | 42 | if (__glibc_unlikely (n == 1)) |
b5d839c9 UD |
43 | { |
44 | /* Another irregular case: since we have to store a NUL byte and | |
45 | there is only room for exactly one byte, we don't have to | |
46 | read anything. */ | |
47 | buf[0] = '\0'; | |
48 | return buf; | |
49 | } | |
77ccaba1 UD |
50 | /* This is very tricky since a file descriptor may be in the |
51 | non-blocking mode. The error flag doesn't mean much in this | |
52 | case. We return an error only when there is a new error. */ | |
53 | old_error = fp->_IO_file_flags & _IO_ERR_SEEN; | |
54 | fp->_IO_file_flags &= ~_IO_ERR_SEEN; | |
d18ea0c5 | 55 | count = _IO_getline (fp, buf, n - 1, '\n', 1); |
05f732b3 UD |
56 | /* If we read in some bytes and errno is EAGAIN, that error will |
57 | be reported for next read. */ | |
58 | if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN) | |
350635a5 | 59 | && errno != EAGAIN)) |
77ccaba1 UD |
60 | result = NULL; |
61 | else | |
62 | { | |
63 | buf[count] = '\0'; | |
64 | result = buf; | |
65 | } | |
66 | fp->_IO_file_flags |= old_error; | |
67 | return result; | |
68 | } | |
3ba06713 | 69 | libc_hidden_def (fgets_unlocked) |