[clang-tools-extra] Add bugprone-undefined-sprintf-overlap (PR #114244)

[Nicolas van Kempen via cfe-commits]

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@@ -0,0 +1,59 @@
+// RUN: %check_clang_tidy %s bugprone-undefined-sprintf-overlap %t
+
+using size_t = decltype(sizeof(int));
+
+extern "C" int sprintf(char *s, const char *format, ...);
+extern "C" int snprintf(char *s, size_t n, const char *format, ...);
+
+namespace std {
+  int snprintf(char *s, size_t n, const char *format, ...);
+}
+
+struct st_t {
+  char buf[10];
+  char buf2[10];
+};
+
+void first_arg_overlaps() {
+  char buf[10];
+  sprintf(buf, "%s", buf);
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nicovank wrote:

Add a test case where `buf` is the the first argument, e.g. `sprintf(buf, "%d%s", 0, buf);` to catch possible regressions.

https://github.com/llvm/llvm-project/pull/114244