1 | /* Test the sprintf (buf, "%s", buf) does not override buf. |
2 | Copyright (C) 2019-2022 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, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <stdarg.h> |
20 | #include <stdio.h> |
21 | #include <string.h> |
22 | |
23 | #include <support/check.h> |
24 | |
25 | enum |
26 | { |
27 | FUNCTION_FIRST, |
28 | FUNCTION_SPRINTF = FUNCTION_FIRST, |
29 | FUNCTION_SNPRINF, |
30 | FUNCTION_VSPRINTF, |
31 | FUNCTION_VSNPRINTF, |
32 | FUNCTION_LAST |
33 | }; |
34 | |
35 | static void |
36 | do_one_test (int function, char *buf, ...) |
37 | { |
38 | va_list args; |
39 | char *arg; |
40 | |
41 | /* Expected results for fortified and non-fortified sprintf. */ |
42 | #if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 1 |
43 | const char *expected = "CD" ; |
44 | #else |
45 | const char *expected = "ABCD" ; |
46 | #endif |
47 | |
48 | va_start (args, buf); |
49 | arg = va_arg (args, char *); |
50 | va_end (args); |
51 | |
52 | switch (function) |
53 | { |
54 | /* The regular sprintf and vsprintf functions do not override the |
55 | destination buffer, even if source and destination overlap. */ |
56 | case FUNCTION_SPRINTF: |
57 | sprintf (buf, "%sCD" , buf); |
58 | TEST_COMPARE_STRING (buf, expected); |
59 | break; |
60 | case FUNCTION_VSPRINTF: |
61 | va_start (args, buf); |
62 | vsprintf (s: arg, fmt: "%sCD" , ap: args); |
63 | TEST_COMPARE_STRING (arg, expected); |
64 | va_end (args); |
65 | break; |
66 | /* On the other hand, snprint and vsnprint override overlapping |
67 | source and destination buffers. */ |
68 | case FUNCTION_SNPRINF: |
69 | snprintf (buf, 3, "%sCD" , buf); |
70 | TEST_COMPARE_STRING (buf, "CD" ); |
71 | break; |
72 | case FUNCTION_VSNPRINTF: |
73 | va_start (args, buf); |
74 | vsnprintf (s: arg, n: 3, fmt: "%sCD" , ap: args); |
75 | TEST_COMPARE_STRING (arg, "CD" ); |
76 | va_end (args); |
77 | break; |
78 | default: |
79 | support_record_failure (); |
80 | } |
81 | } |
82 | |
83 | static int |
84 | do_test (void) |
85 | { |
86 | char buf[8]; |
87 | int i; |
88 | |
89 | /* For each function in the enum do: |
90 | - reset the buffer to the initial state "AB"; |
91 | - call the function with buffer as source and destination; |
92 | - check for the desired behavior. */ |
93 | for (i = FUNCTION_FIRST; i < FUNCTION_LAST; i++) |
94 | { |
95 | strncpy (buf, "AB" , 3); |
96 | do_one_test (function: i, buf, buf); |
97 | } |
98 | |
99 | return 0; |
100 | } |
101 | |
102 | #include <support/test-driver.c> |
103 | |