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b168057a | 1 | /* Copyright (C) 1993-2015 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
96aa2d94 | 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. | |
96aa2d94 | 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 | |
40a55d20 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
96aa2d94 | 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/>. | |
96aa2d94 | 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. */ | |
96aa2d94 RM |
26 | |
27 | #include "libioP.h" | |
a68b0d31 | 28 | #include <stdio.h> |
96aa2d94 | 29 | |
40a55d20 | 30 | char * |
96aa2d94 | 31 | _IO_fgets (buf, n, fp) |
40a55d20 | 32 | char *buf; |
96aa2d94 | 33 | int n; |
40a55d20 | 34 | _IO_FILE *fp; |
96aa2d94 RM |
35 | { |
36 | _IO_size_t count; | |
7c713e28 | 37 | char *result; |
bd355af0 | 38 | int old_error; |
96aa2d94 RM |
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 | } | |
0261d33f | 50 | _IO_acquire_lock (fp); |
bd355af0 UD |
51 | /* This is very tricky since a file descriptor may be in the |
52 | non-blocking mode. The error flag doesn't mean much in this | |
53 | case. We return an error only when there is a new error. */ | |
54 | old_error = fp->_IO_file_flags & _IO_ERR_SEEN; | |
55 | fp->_IO_file_flags &= ~_IO_ERR_SEEN; | |
d18ea0c5 | 56 | count = _IO_getline (fp, buf, n - 1, '\n', 1); |
05f732b3 UD |
57 | /* If we read in some bytes and errno is EAGAIN, that error will |
58 | be reported for next read. */ | |
59 | if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN) | |
60 | && errno != EAGAIN)) | |
7c713e28 RM |
61 | result = NULL; |
62 | else | |
63 | { | |
64 | buf[count] = '\0'; | |
65 | result = buf; | |
66 | } | |
bd355af0 | 67 | fp->_IO_file_flags |= old_error; |
0261d33f | 68 | _IO_release_lock (fp); |
7c713e28 | 69 | return result; |
96aa2d94 RM |
70 | } |
71 | ||
ca34d7a7 | 72 | #ifdef weak_alias |
96aa2d94 | 73 | weak_alias (_IO_fgets, fgets) |
66f8fa9b UD |
74 | |
75 | # ifndef _IO_MTSAFE_IO | |
c4eae752 JM |
76 | strong_alias (_IO_fgets, __fgets_unlocked) |
77 | libc_hidden_def (__fgets_unlocked) | |
66f8fa9b | 78 | weak_alias (_IO_fgets, fgets_unlocked) |
ffa8d2a0 | 79 | libc_hidden_weak (fgets_unlocked) |
66f8fa9b | 80 | # endif |
ca34d7a7 | 81 | #endif |