1//===-- Unittests for vfprintf --------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// These tests are copies of the non-v variants of the printf functions. This is
10// because these functions are identical in every way except for how the varargs
11// are passed.
12
13#ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
14#include "src/stdio/fclose.h"
15#include "src/stdio/ferror.h"
16#include "src/stdio/fopen.h"
17#include "src/stdio/fread.h"
18#endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
19
20#include "src/stdio/vfprintf.h"
21
22#include "test/UnitTest/Test.h"
23
24#include <stdio.h>
25
26namespace printf_test {
27#ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE
28using LIBC_NAMESPACE::fclose;
29using LIBC_NAMESPACE::ferror;
30using LIBC_NAMESPACE::fopen;
31using LIBC_NAMESPACE::fread;
32#else // defined(LIBC_COPT_STDIO_USE_SYSTEM_FILE)
33using ::fclose;
34using ::ferror;
35using ::fopen;
36using ::fread;
37#endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE
38} // namespace printf_test
39
40int call_vfprintf(::FILE *__restrict stream, const char *__restrict format,
41 ...) {
42 va_list vlist;
43 va_start(vlist, format);
44 int ret = LIBC_NAMESPACE::vfprintf(stream, format, vlist);
45 va_end(vlist);
46 return ret;
47}
48
49TEST(LlvmLibcVFPrintfTest, WriteToFile) {
50 const char *FILENAME = "vfprintf_output.test";
51 auto FILE_PATH = libc_make_test_file_path(FILENAME);
52
53 ::FILE *file = printf_test::fopen(filename: FILE_PATH, modes: "w");
54 ASSERT_FALSE(file == nullptr);
55
56 int written;
57
58 constexpr char simple[] = "A simple string with no conversions.\n";
59 written = call_vfprintf(stream: file, format: simple);
60 EXPECT_EQ(written, 37);
61
62 constexpr char numbers[] = "1234567890\n";
63 written = call_vfprintf(stream: file, format: "%s", numbers);
64 EXPECT_EQ(written, 11);
65
66 constexpr char format_more[] = "%s and more\n";
67 constexpr char short_numbers[] = "1234";
68 written = call_vfprintf(stream: file, format: format_more, short_numbers);
69 EXPECT_EQ(written, 14);
70
71 ASSERT_EQ(0, printf_test::fclose(file));
72
73 file = printf_test::fopen(filename: FILE_PATH, modes: "r");
74 ASSERT_FALSE(file == nullptr);
75
76 char data[50];
77 ASSERT_EQ(printf_test::fread(data, 1, sizeof(simple) - 1, file),
78 sizeof(simple) - 1);
79 data[sizeof(simple) - 1] = '\0';
80 ASSERT_STREQ(data, simple);
81 ASSERT_EQ(printf_test::fread(data, 1, sizeof(numbers) - 1, file),
82 sizeof(numbers) - 1);
83 data[sizeof(numbers) - 1] = '\0';
84 ASSERT_STREQ(data, numbers);
85 ASSERT_EQ(printf_test::fread(
86 data, 1, sizeof(format_more) + sizeof(short_numbers) - 4, file),
87 sizeof(format_more) + sizeof(short_numbers) - 4);
88 data[sizeof(format_more) + sizeof(short_numbers) - 4] = '\0';
89 ASSERT_STREQ(data, "1234 and more\n");
90
91 ASSERT_EQ(printf_test::ferror(file), 0);
92
93 written = call_vfprintf(stream: file, format: "Writing to a read only file should fail.");
94 EXPECT_LT(written, 0);
95
96 ASSERT_EQ(printf_test::fclose(file), 0);
97}
98

source code of libc/test/src/stdio/vfprintf_test.cpp