1// RUN: %clangxx_msan -g %s -o %t
2// RUN: %run %t
3// RUN: not %run %t 2 2>&1 | FileCheck %s --check-prefix=CHECK-FPUTS
4// RUN: not %run %t 3 3 2>&1 | FileCheck %s --check-prefix=CHECK-PUTS
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <string.h>
9
10int test_fgets() {
11 FILE *fp = fopen(filename: "/dev/zero", modes: "r");
12 char c;
13
14 if (!fgets(s: &c, n: 1, stream: fp))
15 return 1;
16
17 if (c == '1') // No error
18 return 2;
19
20 fclose(stream: fp);
21 return 0;
22}
23
24int test_fputs() {
25 FILE *fp = fopen(filename: "/dev/null", modes: "w");
26 char buf[2];
27 fputs(s: buf, stream: fp); // BOOM
28 return fclose(stream: fp);
29}
30
31void test_puts() {
32 char buf[2];
33 puts(s: buf); // BOOM
34}
35
36int main(int argc, char *argv[]) {
37 if (argc == 1)
38 test_fgets();
39 else if (argc == 2)
40 test_fputs();
41 else
42 test_puts();
43 return 0;
44}
45
46// CHECK-FPUTS: Uninitialized bytes in fputs at offset 0 inside
47// CHECK-PUTS: Uninitialized bytes in puts at offset 0 inside
48

source code of compiler-rt/test/msan/fgets_fputs.cpp