1 /* { dg-skip-if "requires io" { freestanding } { "*" } { "" } } */
2
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <stdarg.h>
6
7 volatile int should_optimize;
8
9 int
10 __attribute__((noinline))
__fprintf_chk(FILE * f,int flag,const char * fmt,...)11 __fprintf_chk (FILE *f, int flag, const char *fmt, ...)
12 {
13 va_list ap;
14 int ret;
15 #ifdef __OPTIMIZE__
16 if (should_optimize)
17 abort ();
18 #endif
19 should_optimize = 1;
20 va_start (ap, fmt);
21 ret = vfprintf (f, fmt, ap);
22 va_end (ap);
23 return ret;
24 }
25
26 int
main(void)27 main (void)
28 {
29 #define test(ret, opt, args...) \
30 should_optimize = opt; \
31 __fprintf_chk (stdout, 1, args); \
32 if (!should_optimize) \
33 abort (); \
34 should_optimize = 0; \
35 if (__fprintf_chk (stdout, 1, args) != ret) \
36 abort (); \
37 if (!should_optimize) \
38 abort ();
39 test (5, 1, "hello");
40 test (6, 1, "hello\n");
41 test (1, 1, "a");
42 test (0, 1, "");
43 test (5, 1, "%s", "hello");
44 test (6, 1, "%s", "hello\n");
45 test (1, 1, "%s", "a");
46 test (0, 1, "%s", "");
47 test (1, 1, "%c", 'x');
48 test (7, 0, "%s\n", "hello\n");
49 test (2, 0, "%d\n", 0);
50 return 0;
51 }
52