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Diffstat (limited to '')
| -rw-r--r-- | tools/clang-tidy/test/bugprone-suspicious-memset-usage.cpp | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/clang-tidy/test/bugprone-suspicious-memset-usage.cpp b/tools/clang-tidy/test/bugprone-suspicious-memset-usage.cpp new file mode 100644 index 0000000000..71fe7239a1 --- /dev/null +++ b/tools/clang-tidy/test/bugprone-suspicious-memset-usage.cpp @@ -0,0 +1,22 @@ +// https://clang.llvm.org/extra/clang-tidy/checks/bugprone-suspicious-memset-usage.html + +#include "structures.h" + +void test(int* ip, char* cp) +{ + // Case 1: Fill value is a character '0' instead of NUL '\0'. + memset(ip, '0', 1); // WARNING: suspicious for non-char pointers + memset(cp, '0', 1); // OK for char pointers + + // Case 2: Fill value is truncated. + memset(ip, 0xabcd, 1); // WARNING: fill value gets truncated + memset(ip, 0x00cd, 1); // OK because value 0xcd is not truncated. + memset(ip, 0x00, 1); // OK because value is not truncated. + + // Case 3: Byte count is zero. + memset(ip, sizeof(int), 0); // WARNING: zero length, potentially swapped + memset(ip, sizeof(int), 1); // OK with non-zero length + + // See clang bug https://bugs.llvm.org/show_bug.cgi?id=38098 + memset(ip, 8, 0); // OK with zero length without sizeof +} |