llvm-project/clang/test/Sema/format-strings-fixit.c

// RUN: cp %s %t
// RUN: %clang_cc1 -pedantic -Wall -fixit %t
// RUN: %clang_cc1 -fsyntax-only -pedantic -Wall -Werror %t
// RUN: %clang_cc1 -E -o - %t | FileCheck %s

/* This is a test of the various code modification hints that are
   provided as part of warning or extension diagnostics. All of the
   warnings will be fixed by -fixit, and the resulting file should
   compile cleanly with -Werror -pedantic. */

int printf(char const *, ...);

void test() {
  // Basic types
  printf("%s", (int) 123);
  printf("abc%0f", "testing testing 123");
  printf("%u", (long) -12);
  printf("%p", 123);
  printf("%c\n", "x");
  printf("%c\n", 1.23);

  // Larger types
  printf("%+.2d", (unsigned long long) 123456);
  printf("%1d", (long double) 1.23);

  // Flag handling
  printf("%0+s", (unsigned) 31337); // 0 flag should stay
  printf("%#p", (void *) 0);
  printf("% +f", 1.23); // + flag should stay
  printf("%0-f", 1.23); // - flag should stay

  // Positional arguments
  printf("%1$f:%2$.*3$f:%4$.*3$f\n", 1, 2, 3, 4);

  // Precision
  printf("%10.5d", 1l); // (bug 7394)
  printf("%.2c", 'a');

  // Ignored flags
  printf("%0-f", 1.23);

  // Bad length modifiers
  printf("%hhs", "foo");
  printf("%1$zp", (void *)0);
  
  // Perserve the original formatting for unsigned integers.
  unsigned long val = 42;
  printf("%X", val);

  typedef __SIZE_TYPE__ size_t;
  typedef signed long int ssize_t; // FIXME: Figure out the right typedef.
  typedef __INTMAX_TYPE__ intmax_t;
  typedef __UINTMAX_TYPE__ uintmax_t;
  typedef __PTRDIFF_TYPE__ ptrdiff_t;

  // size_t, etc.
  printf("%c", (size_t) 42);
  //printf("%c", (ssize_t) 42);
  printf("%c", (intmax_t) 42);
  printf("%c", (uintmax_t) 42);
  printf("%c", (ptrdiff_t) 42);
}

// Validate the fixes...
// CHECK: printf("%d", (int) 123);
// CHECK: printf("abc%s", "testing testing 123");
// CHECK: printf("%ld", (long) -12);
// CHECK: printf("%d", 123);
// CHECK: printf("%s\n", "x");
// CHECK: printf("%f\n", 1.23);
// CHECK: printf("%.2llu", (unsigned long long) 123456);
// CHECK: printf("%1Lf", (long double) 1.23);
// CHECK: printf("%0u", (unsigned) 31337);
// CHECK: printf("%p", (void *) 0);
// CHECK: printf("%+f", 1.23);
// CHECK: printf("%-f", 1.23);
// CHECK: printf("%1$d:%2$.*3$d:%4$.*3$d\n", 1, 2, 3, 4);
// CHECK: printf("%10.5ld", 1l);
// CHECK: printf("%c", 'a');
// CHECK: printf("%-f", 1.23);
// CHECK: printf("%s", "foo");
// CHECK: printf("%1$p", (void *)0);
// CHECK: printf("%lX", val);
// CHECK: printf("%zu", (size_t) 42);
// CHECK: printf("%jd", (intmax_t) 42);
// CHECK: printf("%ju", (uintmax_t) 42);
// CHECK: printf("%td", (ptrdiff_t) 42);