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1 | /* Copyright (C) 1993, 1996, 1997, 1998, 2002, 2003, 2004 |
2 | Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. | |
19 | ||
20 | As a special exception, if you link the code in this file with | |
21 | files compiled with a GNU compiler to produce an executable, | |
22 | that does not cause the resulting executable to be covered by | |
23 | the GNU Lesser General Public License. This exception does not | |
24 | however invalidate any other reasons why the executable file | |
25 | might be covered by the GNU Lesser General Public License. | |
26 | This exception applies to code released by its copyright holders | |
27 | in files containing the exception. */ | |
28 | ||
29 | #include "../libio/libioP.h" | |
30 | #include <limits.h> | |
31 | ||
32 | char * | |
33 | __gets_chk (char *buf, size_t size) | |
34 | { | |
35 | _IO_size_t count; | |
36 | int ch; | |
37 | char *retval; | |
38 | ||
39 | if (size == 0) | |
40 | __chk_fail (); | |
41 | ||
42 | _IO_acquire_lock (_IO_stdin); | |
43 | ch = _IO_getc_unlocked (_IO_stdin); | |
44 | if (ch == EOF) | |
45 | { | |
46 | retval = NULL; | |
47 | goto unlock_return; | |
48 | } | |
49 | if (ch == '\n') | |
50 | count = 0; | |
51 | else | |
52 | { | |
53 | /* This is very tricky since a file descriptor may be in the | |
54 | non-blocking mode. The error flag doesn't mean much in this | |
55 | case. We return an error only when there is a new error. */ | |
56 | int old_error = _IO_stdin->_IO_file_flags & _IO_ERR_SEEN; | |
57 | _IO_stdin->_IO_file_flags &= ~_IO_ERR_SEEN; | |
58 | buf[0] = (char) ch; | |
59 | count = INTUSE(_IO_getline) (_IO_stdin, buf + 1, size - 1, '\n', 0) + 1; | |
60 | if (_IO_stdin->_IO_file_flags & _IO_ERR_SEEN) | |
61 | { | |
62 | retval = NULL; | |
63 | goto unlock_return; | |
64 | } | |
65 | else | |
66 | _IO_stdin->_IO_file_flags |= old_error; | |
67 | } | |
68 | if (count >= size) | |
69 | __chk_fail (); | |
70 | buf[count] = 0; | |
71 | retval = buf; | |
72 | unlock_return: | |
73 | _IO_release_lock (_IO_stdin); | |
74 | return retval; | |
75 | } | |
76 | ||
77 | link_warning (__gets_chk, "the `gets' function is dangerous and should not be used.") |