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//===-- 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
//
//===----------------------------------------------------------------------===//
#include "src/stdio/snprintf.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
using LlvmLibcSNPrintfTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
// The sprintf test cases cover testing the shared printf functionality, so
// these tests will focus on snprintf exclusive features.
TEST(LlvmLibcSNPrintfTest, CutOff) {
char buff[100];
int written;
written = LIBC_NAMESPACE::snprintf(buff, 16,
"A simple string with no conversions.");
EXPECT_EQ(written, 36);
ASSERT_STREQ(buff, "A simple string");
written = LIBC_NAMESPACE::snprintf(buff, 5, "%s", "1234567890");
EXPECT_EQ(written, 10);
ASSERT_STREQ(buff, "1234");
written = LIBC_NAMESPACE::snprintf(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 = LIBC_NAMESPACE::snprintf(nullptr, 0, "%s and more", "1234567890");
EXPECT_EQ(written, 19);
written = LIBC_NAMESPACE::snprintf(nullptr, 0, "%*s", INT_MIN, "nothing");
EXPECT_EQ(written, INT_MAX);
}
TEST(LlvmLibcSNPrintfTest, NoCutOff) {
char buff[64];
int written;
written = LIBC_NAMESPACE::snprintf(buff, 37,
"A simple string with no conversions.");
EXPECT_EQ(written, 36);
ASSERT_STREQ(buff, "A simple string with no conversions.");
written = LIBC_NAMESPACE::snprintf(buff, 20, "%s", "1234567890");
EXPECT_EQ(written, 10);
ASSERT_STREQ(buff, "1234567890");
}
TEST(LlvmLibcSNPrintfTest, CharsWrittenOverflow) {
char buff[0];
// Trigger an overflow in the return value of snprintf by writing more than
// INT_MAX bytes.
int int_max = LIBC_NAMESPACE::cpp::numeric_limits<int>::max();
int written = LIBC_NAMESPACE::snprintf(buff, 0, "%*stest", int_max, "");
EXPECT_LT(written, 0);
ASSERT_ERRNO_FAILURE();
}
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