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//===-- sanitizer_printf_test.cpp -----------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Tests for sanitizer_printf.cpp
//
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "gtest/gtest.h"
#include <string.h>
#include <limits.h>
namespace __sanitizer {
TEST(Printf, Basic) {
char buf[1024];
uptr len = internal_snprintf(
buf, sizeof(buf), "a%db%zdc%ue%zuf%xh%zxq%pe%sr", (int)-1, (uptr)-2,
(unsigned)-4, (uptr)5, (unsigned)10, (uptr)11, (void *)0x123, "_string_");
EXPECT_EQ(len, strlen(buf));
std::string expectedString = "a-1b-2c4294967292e5fahbq0x";
expectedString += std::string(SANITIZER_POINTER_FORMAT_LENGTH - 3, '0');
expectedString += "123e_string_r";
EXPECT_STREQ(expectedString.c_str(), buf);
}
TEST(Printf, OverflowStr) {
char buf[] = "123456789";
uptr len = internal_snprintf(buf, 4, "%s", "abcdef");
EXPECT_EQ(len, (uptr)6);
EXPECT_STREQ("abc", buf);
EXPECT_EQ(buf[3], 0);
EXPECT_EQ(buf[4], '5');
EXPECT_EQ(buf[5], '6');
EXPECT_EQ(buf[6], '7');
EXPECT_EQ(buf[7], '8');
EXPECT_EQ(buf[8], '9');
EXPECT_EQ(buf[9], 0);
}
TEST(Printf, OverflowInt) {
char buf[] = "123456789";
internal_snprintf(buf, 4, "%d", -123456789);
EXPECT_STREQ("-12", buf);
EXPECT_EQ(buf[3], 0);
EXPECT_EQ(buf[4], '5');
EXPECT_EQ(buf[5], '6');
EXPECT_EQ(buf[6], '7');
EXPECT_EQ(buf[7], '8');
EXPECT_EQ(buf[8], '9');
EXPECT_EQ(buf[9], 0);
}
TEST(Printf, OverflowUint) {
char buf[] = "123456789";
uptr val;
if (sizeof(val) == 4) {
val = (uptr)0x12345678;
} else {
val = (uptr)0x123456789ULL;
}
internal_snprintf(buf, 4, "a%zx", val);
EXPECT_STREQ("a12", buf);
EXPECT_EQ(buf[3], 0);
EXPECT_EQ(buf[4], '5');
EXPECT_EQ(buf[5], '6');
EXPECT_EQ(buf[6], '7');
EXPECT_EQ(buf[7], '8');
EXPECT_EQ(buf[8], '9');
EXPECT_EQ(buf[9], 0);
}
TEST(Printf, OverflowPtr) {
char buf[] = "123456789";
void *p;
if (sizeof(p) == 4) {
p = (void*)0x1234567;
} else {
p = (void*)0x123456789ULL;
}
internal_snprintf(buf, 4, "%p", p);
EXPECT_STREQ("0x0", buf);
EXPECT_EQ(buf[3], 0);
EXPECT_EQ(buf[4], '5');
EXPECT_EQ(buf[5], '6');
EXPECT_EQ(buf[6], '7');
EXPECT_EQ(buf[7], '8');
EXPECT_EQ(buf[8], '9');
EXPECT_EQ(buf[9], 0);
}
#if defined(_WIN32)
// Oh well, MSVS headers don't define snprintf.
# define snprintf _snprintf
#endif
template<typename T>
static void TestAgainstLibc(const char *fmt, T arg1, T arg2) {
char buf[1024];
uptr len = internal_snprintf(buf, sizeof(buf), fmt, arg1, arg2);
char buf2[1024];
snprintf(buf2, sizeof(buf2), fmt, arg1, arg2);
EXPECT_EQ(len, strlen(buf));
EXPECT_STREQ(buf2, buf);
}
TEST(Printf, MinMax) {
TestAgainstLibc<int>("%d-%d", INT_MIN, INT_MAX);
TestAgainstLibc<unsigned>("%u-%u", 0, UINT_MAX);
TestAgainstLibc<unsigned>("%x-%x", 0, UINT_MAX);
#if !defined(_WIN32)
// %z* format doesn't seem to be supported by MSVS.
TestAgainstLibc<long>("%zd-%zd", LONG_MIN, LONG_MAX);
TestAgainstLibc<unsigned long>("%zu-%zu", 0, ULONG_MAX);
TestAgainstLibc<unsigned long>("%zx-%zx", 0, ULONG_MAX);
#endif
}
TEST(Printf, Padding) {
TestAgainstLibc<int>("%3d - %3d", 1, 0);
TestAgainstLibc<int>("%3d - %3d", -1, 123);
TestAgainstLibc<int>("%3d - %3d", -1, -123);
TestAgainstLibc<int>("%3d - %3d", 12, 1234);
TestAgainstLibc<int>("%3d - %3d", -12, -1234);
TestAgainstLibc<int>("%03d - %03d", 1, 0);
TestAgainstLibc<int>("%03d - %03d", -1, 123);
TestAgainstLibc<int>("%03d - %03d", -1, -123);
TestAgainstLibc<int>("%03d - %03d", 12, 1234);
TestAgainstLibc<int>("%03d - %03d", -12, -1234);
}
TEST(Printf, Precision) {
char buf[1024];
uptr len = internal_snprintf(buf, sizeof(buf), "%.*s", 3, "12345");
EXPECT_EQ(3U, len);
EXPECT_STREQ("123", buf);
len = internal_snprintf(buf, sizeof(buf), "%.*s", 6, "12345");
EXPECT_EQ(5U, len);
EXPECT_STREQ("12345", buf);
len = internal_snprintf(buf, sizeof(buf), "%-6s", "12345");
EXPECT_EQ(6U, len);
EXPECT_STREQ("12345 ", buf);
// Check that width does not overflow the smaller buffer, although
// 10 chars is requested, it stops at the buffer size, 8.
len = internal_snprintf(buf, 8, "%-10s", "12345");
EXPECT_EQ(10U, len); // The required size reported.
EXPECT_STREQ("12345 ", buf);
}
} // namespace __sanitizer
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