1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
//===-- Unittests for snprintf --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// These tests are copies of the non-v variants of the printf functions. This is
// because these functions are identical in every way except for how the varargs
// are passed.
#include "src/stdio/vsnprintf.h"
#include "test/UnitTest/Test.h"
int call_vsnprintf(char *__restrict buffer, size_t buffsz,
const char *__restrict format, ...) {
va_list vlist;
va_start(vlist, format);
int ret = LIBC_NAMESPACE::vsnprintf(buffer, buffsz, format, vlist);
va_end(vlist);
return ret;
}
// The sprintf test cases cover testing the shared printf functionality, so
// these tests will focus on snprintf exclusive features.
TEST(LlvmLibcVSNPrintfTest, CutOff) {
char buff[100];
int written;
written = call_vsnprintf(buff, 16, "A simple string with no conversions.");
EXPECT_EQ(written, 36);
ASSERT_STREQ(buff, "A simple string");
written = call_vsnprintf(buff, 5, "%s", "1234567890");
EXPECT_EQ(written, 10);
ASSERT_STREQ(buff, "1234");
written = call_vsnprintf(buff, 67, "%-101c", 'a');
EXPECT_EQ(written, 101);
ASSERT_STREQ(buff, "a "
" " // Each of these is 8 spaces, and there are 8.
" " // In total there are 65 spaces
" " // 'a' + 65 spaces + '\0' = 67
" "
" "
" "
" "
" ");
// passing null as the output pointer is allowed as long as buffsz is 0.
written = call_vsnprintf(nullptr, 0, "%s and more", "1234567890");
EXPECT_EQ(written, 19);
}
TEST(LlvmLibcVSNPrintfTest, NoCutOff) {
char buff[64];
int written;
written = call_vsnprintf(buff, 37, "A simple string with no conversions.");
EXPECT_EQ(written, 36);
ASSERT_STREQ(buff, "A simple string with no conversions.");
written = call_vsnprintf(buff, 20, "%s", "1234567890");
EXPECT_EQ(written, 10);
ASSERT_STREQ(buff, "1234567890");
}
|
