#include <cstdio> void bad() { char x[100]; 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.}} 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.}} snprintf(x, 101, "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.}} const int hundred = 100; 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.}} const int hundredandone = 101; snprintf(x, hundredandone, "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.}} } void ok() { char x[100]; int y; snprintf(x, sizeof(y), "what"); snprintf(x, 50, "what"); int nothundred = 100; nothundred = 99; snprintf(x, nothundred, "what"); } void vargs_bad(va_list args) { char x[100]; 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.}} 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.}} vsnprintf(x, 101, "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.}} const int hundred = 100; 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.}} const int hundredandone = 101; vsnprintf(x, hundredandone, "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.}} } void vargs_good(va_list args) { char x[100]; int y; vsnprintf(x, sizeof(y), "what", args); vsnprintf(x, 50, "what", args); int nothundred = 100; nothundred = 99; vsnprintf(x, nothundred, "what", args); }