[PATCH] D158562: [clang][Sema] Add truncation warning on fortified snprintf

[Takuya Shimizu via Phabricator via cfe-commits]

hazohelet created this revision.
hazohelet added reviewers: aaron.ballman, serge-sans-paille, nickdesaulniers, tbaeder.
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hazohelet requested review of this revision.
Herald added a project: clang.

This patch warns on `snprintf` calls whose `n` argument is known to be smaller than the size of the formatted string like

  char buf[5];
  snprintf(buf, 5, "Hello");

This is a counterpart of gcc's `Wformat-truncation`
Fixes https://github.com/llvm/llvm-project/issues/64871


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158562

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaChecking.cpp
  clang/test/Analysis/taint-generic.c
  clang/test/Sema/format-strings.c
  clang/test/Sema/warn-fortify-source.c

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