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6d7e8eda | 1 | /* Copyright (C) 1993-2023 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 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://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" | |
28 | #include <limits.h> | |
29 | ||
9d46370c JM |
30 | char * |
31 | _IO_gets (char *buf) | |
96aa2d94 | 32 | { |
9964a145 | 33 | size_t count; |
7c713e28 | 34 | int ch; |
8a4b65b4 | 35 | char *retval; |
7c713e28 | 36 | |
ee9941f9 FW |
37 | _IO_acquire_lock (stdin); |
38 | ch = _IO_getc_unlocked (stdin); | |
96aa2d94 | 39 | if (ch == EOF) |
8a4b65b4 UD |
40 | { |
41 | retval = NULL; | |
42 | goto unlock_return; | |
43 | } | |
96aa2d94 RM |
44 | if (ch == '\n') |
45 | count = 0; | |
46 | else | |
47 | { | |
bd355af0 UD |
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. */ | |
ee9941f9 FW |
51 | int old_error = stdin->_flags & _IO_ERR_SEEN; |
52 | stdin->_flags &= ~_IO_ERR_SEEN; | |
40a55d20 | 53 | buf[0] = (char) ch; |
ee9941f9 FW |
54 | count = _IO_getline (stdin, buf + 1, INT_MAX, '\n', 0) + 1; |
55 | if (stdin->_flags & _IO_ERR_SEEN) | |
8a4b65b4 UD |
56 | { |
57 | retval = NULL; | |
58 | goto unlock_return; | |
59 | } | |
bd355af0 | 60 | else |
ee9941f9 | 61 | stdin->_flags |= old_error; |
96aa2d94 RM |
62 | } |
63 | buf[count] = 0; | |
8a4b65b4 UD |
64 | retval = buf; |
65 | unlock_return: | |
ee9941f9 | 66 | _IO_release_lock (stdin); |
8a4b65b4 | 67 | return retval; |
96aa2d94 RM |
68 | } |
69 | ||
70 | weak_alias (_IO_gets, gets) | |
d41c6f61 UD |
71 | |
72 | link_warning (gets, "the `gets' function is dangerous and should not be used.") |