build/clang-plugin/tests/TestSprintfLiteral.cpp

   1 #include <cstdio>
   2
   3 void bad() {
   4   char x[100];
   5   snprintf(x, sizeof(x), "bar"); // expected-error {{Use SprintfLiteral instead of snprintf when writing into a character array.}} expected-note {{This will prevent passing in the wrong size to snprintf accidentally.}}
   6   snprintf(x, 100, "bar"); // expected-error {{Use SprintfLiteral instead of snprintf when writing into a character array.}} expected-note {{This will prevent passing in the wrong size to snprintf accidentally.}}
   7   const int hundred = 100;
   8   snprintf(x, hundred, "bar"); // expected-error {{Use SprintfLiteral instead of snprintf when writing into a character array.}} expected-note {{This will prevent passing in the wrong size to snprintf accidentally.}}
   9 }
  10
  11 void ok() {
  12   char x[100];
  13   int y;
  14   snprintf(x, sizeof(y), "foo");
  15
  16   snprintf(x, 50, "foo");
  17
  18   int nothundred = 100;
  19   nothundred = 99;
  20   snprintf(x, nothundred, "foo");
  21 }
  22
  23 void vargs_bad(va_list args) {
  24   char x[100];
  25   vsnprintf(x, sizeof(x), "bar", args); // expected-error {{Use VsprintfLiteral instead of vsnprintf when writing into a character array.}} expected-note {{This will prevent passing in the wrong size to vsnprintf accidentally.}}
  26   vsnprintf(x, 100, "bar", args); // expected-error {{Use VsprintfLiteral instead of vsnprintf when writing into a character array.}} expected-note {{This will prevent passing in the wrong size to vsnprintf accidentally.}}
  27   const int hundred = 100;
  28   vsnprintf(x, hundred, "bar", args); // expected-error {{Use VsprintfLiteral instead of vsnprintf when writing into a character array.}} expected-note {{This will prevent passing in the wrong size to vsnprintf accidentally.}}
  29 }
  30
  31 void vargs_good(va_list args) {
  32   char x[100];
  33   int y;
  34   vsnprintf(x, sizeof(y), "foo", args);
  35
  36   vsnprintf(x, 50, "foo", args);
  37
  38   int nothundred = 100;
  39   nothundred = 99;
  40   vsnprintf(x, nothundred, "foo", args);
  41 }