/src/curl_fuzzer/full_coverage/dynamic_formatting.cc
Line | Count | Source |
1 | | /* |
2 | | * Copyright (C) Max Dymond, <cmeister2@gmail.com>, et al. |
3 | | * |
4 | | * SPDX-License-Identifier: curl |
5 | | */ |
6 | | |
7 | | #include "full_coverage/dynamic_formatting.h" |
8 | | |
9 | | #include <cstdarg> |
10 | | #include <cstring> |
11 | | |
12 | | // Use curl's real private layout, including its debug-build fields. |
13 | | extern "C" { |
14 | | #include "curl_setup.h" |
15 | | #include "curlx/dynbuf.h" |
16 | | } |
17 | | |
18 | | namespace full_coverage { |
19 | | namespace { |
20 | | |
21 | | /** Call the va_list formatter with an independently bounded destination. */ |
22 | | void ExerciseFormat(size_t limit, const char *format, ...) |
23 | 7 | { |
24 | 7 | dynbuf buffer; |
25 | 7 | curlx_dyn_init(&buffer, limit); |
26 | 7 | va_list args; |
27 | 7 | va_start(args, format); |
28 | 7 | volatile int result = curlx_dyn_vprintf(&buffer, format, args); |
29 | 7 | va_end(args); |
30 | 7 | (void)result; |
31 | 7 | curlx_dyn_free(&buffer); |
32 | 7 | } |
33 | | |
34 | | } // namespace |
35 | | |
36 | | void ExerciseDynamicFormattingCoverage() |
37 | 1 | { |
38 | | // Exact fit and the first byte above the limit cover the staged formatter's |
39 | | // normal size-limit handling without relying on failed allocations. |
40 | 1 | ExerciseFormat(8, "%s", "1234567"); |
41 | 1 | ExerciseFormat(8, "%s", "12345678"); |
42 | 1 | ExerciseFormat(8, "%08d", 1); |
43 | 1 | ExerciseFormat(8, "%c", 'x'); |
44 | 1 | ExerciseFormat(8, "%s", ""); |
45 | | |
46 | 1 | char text[601]; |
47 | 1 | std::memset(text, 'x', sizeof(text) - 1); |
48 | 1 | text[sizeof(text) - 1] = '\0'; |
49 | | // Cross the staging buffer boundary both with room and at a small limit. |
50 | 1 | ExerciseFormat(1024, "%s", text); |
51 | 1 | ExerciseFormat(512, "%s", text); |
52 | 1 | } |
53 | | |
54 | | } // namespace full_coverage |