1/* Tests of *printf for very large strings.
2 Copyright (C) 2000-2022 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 <array_length.h>
20#include <locale.h>
21#include <mcheck.h>
22#include <stdint.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <unistd.h>
27#include <sys/stat.h>
28#include <libc-diag.h>
29
30
31const char *locs[] =
32{
33 "C", "de_DE.ISO-8859-1", "de_DE.UTF-8", "ja_JP.EUC-JP"
34};
35
36char large[50000];
37
38static int
39do_test (void)
40{
41 char buf[25];
42 size_t i;
43 int res = 0;
44 int fd;
45
46 mtrace ();
47
48 strcpy (buf, "/tmp/test-vfprintfXXXXXX");
49 fd = mkstemp (template: buf);
50 if (fd == -1)
51 {
52 printf (format: "cannot open temporary file: %m\n");
53 exit (1);
54 }
55 unlink (name: buf);
56
57 for (i = 0; i < array_length (locs); ++i)
58 {
59 FILE *fp;
60 struct stat st;
61 int fd2;
62
63 setlocale (LC_ALL, locs[i]);
64
65 memset (large, '\1', sizeof (large));
66 large[sizeof (large) - 1] = '\0';
67
68 fd2 = dup (fd: fd);
69 if (fd2 == -1)
70 {
71 printf (format: "cannot dup for locale %s: %m\n",
72 setlocale (LC_ALL, NULL));
73 exit (1);
74 }
75
76 if (ftruncate (fd: fd2, length: 0) != 0)
77 {
78 printf (format: "cannot truncate file for locale %s: %m\n",
79 setlocale (LC_ALL, NULL));
80 exit (1);
81 }
82
83 fp = fdopen (fd2, "a");
84 if (fp == NULL)
85 {
86 printf (format: "cannot create FILE for locale %s: %m\n",
87 setlocale (LC_ALL, NULL));
88 exit (1);
89 }
90
91 fprintf (fp, "%s", large);
92 fprintf (fp, "%.*s", 30000, large);
93 large[20000] = '\0';
94 /* We're testing a large format string here and need to generate it
95 to avoid this source file being ridiculous. So disable the warning
96 about a generated format string. */
97 DIAG_PUSH_NEEDS_COMMENT;
98 DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat-security");
99 fprintf (fp, large);
100 DIAG_POP_NEEDS_COMMENT;
101 fprintf (fp, "%-1.300000000s", "hello");
102
103 if (fflush (fp) != 0 || ferror (stream: fp) != 0 || fclose (fp) != 0)
104 {
105 printf (format: "write error for locale %s: %m\n",
106 setlocale (LC_ALL, NULL));
107 exit (1);
108 }
109
110 if (fstat (fd: fd, buf: &st) != 0)
111 {
112 printf (format: "cannot stat for locale %s: %m\n",
113 setlocale (LC_ALL, NULL));
114 exit (1);
115 }
116 else if (st.st_size != 50000 + 30000 + 19999 + 5)
117 {
118 printf (format: "file size incorrect for locale %s: %jd instead of %jd\n",
119 setlocale (LC_ALL, NULL),
120 (intmax_t) st.st_size,
121 (intmax_t) 50000 + 30000 + 19999 + 5);
122 res = 1;
123 }
124 else
125 printf (format: "locale %s OK\n", setlocale (LC_ALL, NULL));
126 }
127
128 close (fd: fd);
129
130 return res;
131}
132
133#define TEST_FUNCTION do_test ()
134#include "../test-skeleton.c"
135

source code of glibc/stdio-common/test-vfprintf.c