| //===-- 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/Test.h" |
| |
| // 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); |
| } |
| |
| 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"); |
| } |