printf_test.c revision 331722 
1/* $FreeBSD: stable/11/share/examples/tests/tests/plain/printf_test.c 331722 2018-03-29 02:50:57Z eadler $
2 *
3 * Copyright 2013 Google Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 *   notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 * * Neither the name of Google Inc. nor the names of its contributors
16 *   may be used to endorse or promote products derived from this software
17 *   without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
30
31/*
32 * INTRODUCTION
33 *
34 * This plain test program mimics the structure and contents of its
35 * ATF-based counterpart.  It attempts to represent various test cases
36 * in different separate functions and just calls them all from main().
37 *
38 * In reality, plain test programs can be much simpler.  All they have
39 * to do is return 0 on success and non-0 otherwise.
40 */
41
42#include <err.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46
47static void
48snprintf__two_formatters(void)
49{
50	char buffer[128];
51
52	if (snprintf(buffer, sizeof(buffer), "%s, %s!", "Hello",
53	    "tests") <= 0)
54		errx(EXIT_FAILURE, "snprintf with two formatters failed");
55
56	if (strcmp(buffer, "Hello, tests!") != 0)
57		errx(EXIT_FAILURE, "Bad formatting: got %s", buffer);
58}
59
60static void
61snprintf__overflow(void)
62{
63	char buffer[10];
64
65	if (snprintf(buffer, sizeof(buffer), "0123456789abcdef") != 16)
66		errx(EXIT_FAILURE, "snprintf did not return the expected "
67		    "number of characters");
68
69	if (strcmp(buffer, "012345678") != 0)
70		errx(EXIT_FAILURE, "Bad formatting: got %s", buffer);
71}
72
73static void
74fprintf__simple_string(void)
75{
76	FILE *file;
77	char buffer[128];
78	size_t length;
79	const char *contents = "This is a message\n";
80
81	file = fopen("test.txt", "w+");
82	if (fprintf(file, "%s", contents) <= 0)
83		err(EXIT_FAILURE, "fprintf failed to write to file");
84	rewind(file);
85	length = fread(buffer, 1, sizeof(buffer) - 1, file);
86	if (length != strlen(contents))
87		err(EXIT_FAILURE, "fread failed");
88	buffer[length] = '\0';
89	fclose(file);
90
91	if (strcmp(buffer, contents) != 0)
92		errx(EXIT_FAILURE, "Written and read data differ");
93
94	/* Of special note here is that we are NOT deleting the temporary
95	 * files we created in this test.  Kyua takes care of this cleanup
96	 * automatically and tests can (and should) rely on this behavior. */
97}
98
99int
100main(void)
101{
102	/* If you have read the printf_test.c counterpart in the atf/
103	 * directory, you may think that the sequencing of tests below and
104	 * the exposed behavior to the user is very similar.  But you'd be
105	 * wrong.
106	 *
107	 * There are two major differences with this and the ATF version.
108	 * The first is that the code below has no provisions to detect
109	 * failures in one test and continue running the other tests: the
110	 * first failure causes the whole test program to exit.  The second
111	 * is that this particular main() has no arguments: without ATF,
112	 * all test programs may expose a different command-line interface,
113	 * and this is an issue for consistency purposes. */
114	snprintf__two_formatters();
115	snprintf__overflow();
116	fprintf__simple_string();
117
118	return EXIT_SUCCESS;
119}
120