1 //===-- Unittests for fprintf ---------------------------------------------===//
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 #include "src/stdio/fclose.h"
10 #include "src/stdio/ferror.h"
11 #include "src/stdio/fopen.h"
12 #include "src/stdio/fread.h"
13 
14 #include "src/stdio/fprintf.h"
15 
16 #include "utils/UnitTest/Test.h"
17 
18 #include <errno.h>
19 #include <stdio.h>
20 
21 TEST(LlvmLibcFPrintfTest, WriteToFile) {
22   constexpr char FILENAME[] = "testdata/fprintf_output.test";
23   ::FILE *file = __llvm_libc::fopen(FILENAME, "w");
24   ASSERT_FALSE(file == nullptr);
25 
26   int written;
27 
28   constexpr char simple[] = "A simple string with no conversions.\n";
29   written = __llvm_libc::fprintf(file, simple);
30   EXPECT_EQ(written, 37);
31 
32   constexpr char numbers[] = "1234567890\n";
33   written = __llvm_libc::fprintf(file, "%s", numbers);
34   EXPECT_EQ(written, 11);
35 
36   constexpr char format_more[] = "%s and more\n";
37   constexpr char short_numbers[] = "1234";
38   written = __llvm_libc::fprintf(file, format_more, short_numbers);
39   EXPECT_EQ(written, 14);
40 
41   ASSERT_EQ(0, __llvm_libc::fclose(file));
42 
43   file = __llvm_libc::fopen(FILENAME, "r");
44   ASSERT_FALSE(file == nullptr);
45 
46   char data[50];
47   ASSERT_EQ(__llvm_libc::fread(data, 1, sizeof(simple) - 1, file),
48             sizeof(simple) - 1);
49   data[sizeof(simple) - 1] = '\0';
50   ASSERT_STREQ(data, simple);
51   ASSERT_EQ(__llvm_libc::fread(data, 1, sizeof(numbers) - 1, file),
52             sizeof(numbers) - 1);
53   data[sizeof(numbers) - 1] = '\0';
54   ASSERT_STREQ(data, numbers);
55   ASSERT_EQ(__llvm_libc::fread(
56                 data, 1, sizeof(format_more) + sizeof(short_numbers) - 4, file),
57             sizeof(format_more) + sizeof(short_numbers) - 4);
58   data[sizeof(format_more) + sizeof(short_numbers) - 4] = '\0';
59   ASSERT_STREQ(data, "1234 and more\n");
60 
61   ASSERT_EQ(__llvm_libc::ferror(file), 0);
62 
63   written =
64       __llvm_libc::fprintf(file, "Writing to a read only file should fail.");
65   EXPECT_LT(written, 0);
66 
67   ASSERT_EQ(__llvm_libc::fclose(file), 0);
68 }
69