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568035b7 | 1 | /* Copyright (C) 1993-2013 Free Software Foundation, Inc. |
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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 | |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
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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 <stdio.h> | |
29 | #include <sys/param.h> | |
30 | ||
31 | char * | |
32 | __fgets_chk (buf, size, n, fp) | |
33 | char *buf; | |
34 | size_t size; | |
35 | int n; | |
36 | _IO_FILE *fp; | |
37 | { | |
38 | _IO_size_t count; | |
39 | char *result; | |
40 | CHECK_FILE (fp, NULL); | |
41 | if (n <= 0) | |
42 | return NULL; | |
43 | _IO_acquire_lock (fp); | |
44 | /* This is very tricky since a file descriptor may be in the | |
45 | non-blocking mode. The error flag doesn't mean much in this | |
46 | case. We return an error only when there is a new error. */ | |
47 | int old_error = fp->_IO_file_flags & _IO_ERR_SEEN; | |
48 | fp->_IO_file_flags &= ~_IO_ERR_SEEN; | |
d18ea0c5 | 49 | count = _IO_getline (fp, buf, MIN ((size_t) n - 1, size), '\n', 1); |
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50 | /* If we read in some bytes and errno is EAGAIN, that error will |
51 | be reported for next read. */ | |
52 | if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN) | |
53 | && errno != EAGAIN)) | |
54 | result = NULL; | |
55 | else if (count >= size) | |
56 | __chk_fail (); | |
57 | else | |
58 | { | |
59 | buf[count] = '\0'; | |
60 | result = buf; | |
61 | } | |
62 | fp->_IO_file_flags |= old_error; | |
63 | _IO_release_lock (fp); | |
64 | return result; | |
65 | } |