1 | /* Test writing differently sized strings to a memstream. |
2 | Copyright (C) 2022-2024 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 <stdio.h> |
20 | #include <stdlib.h> |
21 | #include <string.h> |
22 | #include <support/check.h> |
23 | #include <support/support.h> |
24 | #include <support/xmemstream.h> |
25 | |
26 | /* Returns a printable ASCII character based on INDEX. */ |
27 | static inline char |
28 | char_from_index (unsigned int index) |
29 | { |
30 | return ' ' + (index % 95); |
31 | } |
32 | |
33 | enum { result_size = 25000 }; |
34 | |
35 | static void |
36 | run_one_size (unsigned int chunk_size) |
37 | { |
38 | char *chunk = xmalloc (n: chunk_size + 1); |
39 | |
40 | struct xmemstream mem; |
41 | xopen_memstream (stream: &mem); |
42 | unsigned int written = 0; |
43 | for (unsigned int i = 0; i < result_size; ) |
44 | { |
45 | unsigned int to_print = result_size - i; |
46 | if (to_print > chunk_size) |
47 | to_print = chunk_size; |
48 | for (unsigned int j = 0; j < to_print; ++j) |
49 | chunk[j] = char_from_index(index: i + j); |
50 | chunk[to_print] = '\0'; |
51 | fprintf (mem.out, "%s" , chunk); /* Needs -fno-builtin-fprintf. */ |
52 | i += to_print; |
53 | written += strlen(chunk); |
54 | } |
55 | xfclose_memstream (stream: &mem); |
56 | |
57 | TEST_COMPARE (written, result_size); |
58 | TEST_COMPARE (mem.length, result_size); |
59 | TEST_COMPARE (strlen (mem.buffer), result_size); |
60 | |
61 | for (unsigned int i = 0; i < result_size; ++i) |
62 | TEST_COMPARE (mem.buffer[i], char_from_index (i)); |
63 | |
64 | free (ptr: mem.buffer); |
65 | free (ptr: chunk); |
66 | } |
67 | |
68 | static int |
69 | do_test (void) |
70 | { |
71 | for (unsigned int chunk_size = 1; chunk_size <= 30; ++ chunk_size) |
72 | run_one_size (chunk_size); |
73 | |
74 | return 0; |
75 | } |
76 | |
77 | #include <support/test-driver.c> |
78 | |