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1 | /* Copyright (C) 1993-2021 Free Software Foundation, Inc. | |
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 | |
15 | License along with the GNU C Library; if not, see | |
16 | <https://www.gnu.org/licenses/>. | |
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 "strfile.h" | |
29 | ||
30 | static int __THROW | |
31 | _IO_str_chk_overflow (FILE *fp, int c) | |
32 | { | |
33 | /* If we get here, the user-supplied buffer would be overrun by | |
34 | further output. */ | |
35 | __chk_fail (); | |
36 | } | |
37 | ||
38 | static const struct _IO_jump_t _IO_str_chk_jumps libio_vtable = | |
39 | { | |
40 | JUMP_INIT_DUMMY, | |
41 | JUMP_INIT(finish, _IO_str_finish), | |
42 | JUMP_INIT(overflow, _IO_str_chk_overflow), | |
43 | JUMP_INIT(underflow, _IO_str_underflow), | |
44 | JUMP_INIT(uflow, _IO_default_uflow), | |
45 | JUMP_INIT(pbackfail, _IO_str_pbackfail), | |
46 | JUMP_INIT(xsputn, _IO_default_xsputn), | |
47 | JUMP_INIT(xsgetn, _IO_default_xsgetn), | |
48 | JUMP_INIT(seekoff, _IO_str_seekoff), | |
49 | JUMP_INIT(seekpos, _IO_default_seekpos), | |
50 | JUMP_INIT(setbuf, _IO_default_setbuf), | |
51 | JUMP_INIT(sync, _IO_default_sync), | |
52 | JUMP_INIT(doallocate, _IO_default_doallocate), | |
53 | JUMP_INIT(read, _IO_default_read), | |
54 | JUMP_INIT(write, _IO_default_write), | |
55 | JUMP_INIT(seek, _IO_default_seek), | |
56 | JUMP_INIT(close, _IO_default_close), | |
57 | JUMP_INIT(stat, _IO_default_stat), | |
58 | JUMP_INIT(showmanyc, _IO_default_showmanyc), | |
59 | JUMP_INIT(imbue, _IO_default_imbue) | |
60 | }; | |
61 | ||
62 | /* This function is called by regular vsprintf with maxlen set to -1, | |
63 | and by vsprintf_chk with maxlen set to the size of the output | |
64 | string. In the former case, _IO_str_chk_overflow will never be | |
65 | called; in the latter case it will crash the program if the buffer | |
66 | overflows. */ | |
67 | ||
68 | int | |
69 | __vsprintf_internal (char *string, size_t maxlen, | |
70 | const char *format, va_list args, | |
71 | unsigned int mode_flags) | |
72 | { | |
73 | _IO_strfile sf; | |
74 | int ret; | |
75 | ||
76 | #ifdef _IO_MTSAFE_IO | |
77 | sf._sbf._f._lock = NULL; | |
78 | #endif | |
79 | _IO_no_init (&sf._sbf._f, _IO_USER_LOCK, -1, NULL, NULL); | |
80 | /* When called from fortified sprintf/vsprintf, erase the destination | |
81 | buffer and try to detect overflows. When called from regular | |
82 | sprintf/vsprintf, do not erase the destination buffer, because | |
83 | known user code relies on this behavior (even though its undefined | |
84 | by ISO C), nor try to detect overflows. */ | |
85 | if ((mode_flags & PRINTF_CHK) != 0) | |
86 | { | |
87 | _IO_JUMPS (&sf._sbf) = &_IO_str_chk_jumps; | |
88 | string[0] = '\0'; | |
89 | } | |
90 | else | |
91 | _IO_JUMPS (&sf._sbf) = &_IO_str_jumps; | |
92 | _IO_str_init_static_internal (&sf, string, | |
93 | (maxlen == -1) ? -1 : maxlen - 1, | |
94 | string); | |
95 | ||
96 | ret = __vfprintf_internal (&sf._sbf._f, format, args, mode_flags); | |
97 | ||
98 | *sf._sbf._f._IO_write_ptr = '\0'; | |
99 | return ret; | |
100 | } | |
101 | ||
102 | int | |
103 | __vsprintf (char *string, const char *format, va_list args) | |
104 | { | |
105 | return __vsprintf_internal (string, -1, format, args, 0); | |
106 | } | |
107 | ||
108 | ldbl_strong_alias (__vsprintf, _IO_vsprintf) | |
109 | ldbl_weak_alias (__vsprintf, vsprintf) |