================
@@ -0,0 +1,277 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wmissing-format-attribute %s
+
+typedef unsigned short char16_t;
+typedef unsigned int char32_t;
+typedef __WCHAR_TYPE__ wchar_t;
+typedef __SIZE_TYPE__ size_t;
+typedef __builtin_va_list va_list;
+
+__attribute__((__format__(__printf__, 1, 2)))
+int printf(const char *, ...); // #printf
+
+__attribute__((__format__(__scanf__, 1, 2)))
+int scanf(const char *, ...); // #scanf
+
+__attribute__((__format__(__printf__, 1, 0)))
+int vprintf(const char *, va_list); // #vprintf
+
+__attribute__((__format__(__scanf__, 1, 0)))
+int vscanf(const char *, va_list); // #vscanf
+
+__attribute__((__format__(__printf__, 2, 0)))
+int vsprintf(char *, const char *, va_list); // #vsprintf
+
+__attribute__((__format__(__printf__, 3, 0)))
+int vsnprintf(char *ch, size_t, const char *, va_list); // #vsnprintf
+
+__attribute__((__format__(__scanf__, 1, 4)))
+void f1(char *out, const size_t len, const char *format, ... /* args */) // #f1
+{
+ va_list args;
+ vsnprintf(out, len, format, args); // expected-warning@#f1 {{diagnostic
behavior may be improved by adding the 'printf' format attribute to the
declaration of 'f1'}}
+ // CHECK-FIXES:
__attribute__((format(printf, 3, 4)))
+}
+
+__attribute__((__format__(__printf__, 1, 4)))
+void f2(char *out, const size_t len, const char *format, ... /* args */) // #f2
+{
+ va_list args;
+ vsnprintf(out, len, format, args); // expected-warning@#f2 {{diagnostic
behavior may be improved by adding the 'printf' format attribute to the
declaration of 'f2'}}
+ // CHECK-FIXES:
__attribute__((format(printf, 3, 4)))
+}
+
+void f3(char *out, va_list args) // #f3
+{
+ vprintf(out, args); // expected-warning@#f3 {{diagnostic behavior may be
improved by adding the 'printf' format attribute to the declaration of 'f3'}}
+ // CHECK-FIXES: __attribute__((format(printf, 1, 0)))
+ vscanf(out, args); // expected-warning@#f3 {{diagnostic behavior may be
improved by adding the 'scanf' format attribute to the declaration of 'f3'}}
+ // CHECK-FIXES: __attribute__((format(scanf, 1, 0)))
----------------
AaronBallman wrote:
This seems like a situation where it makes more sense to not emit the
diagnostic or the fix-it, right? The chances of this function being a format
function in practice are pretty small because the format specifiers mean
different things. e.g., `%d` is a specifier for an `int` for `printf` but `int
*` for `scanf`.
https://github.com/llvm/llvm-project/pull/70024
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