1 /* Copyright (C) 2000  Free Software Foundation.
2 
3    Ensure all expected transformations of builtin strstr occur and
4    perform correctly.
5 
6    Written by Kaveh R. Ghazi, 11/6/2000.  */
7 
8 extern void abort(void);
9 extern char *strstr (const char *, const char *);
10 
11 int main()
12 {
13   const char *const foo = "hello world";
14 
15   if (strstr (foo, "") != foo)
16     abort();
17   if (strstr (foo + 4, "") != foo + 4)
18     abort();
19   if (strstr (foo, "h") != foo)
20     abort();
21   if (strstr (foo, "w") != foo + 6)
22     abort();
23   if (strstr (foo + 6, "o") != foo + 7)
24     abort();
25   if (strstr (foo + 1, "world") != foo + 6)
26     abort();
27 
28   /* Test at least one instance of the __builtin_ style.  We do this
29      to ensure that it works and that the prototype is correct.  */
30   if (__builtin_strstr (foo + 1, "world") != foo + 6)
31     abort();
32 
33   return 0;
34 }
35 
36 #ifdef __OPTIMIZE__
37 /* When optimizing, all the above cases should be transformed into
38    something else.  So any remaining calls to the original function
39    should abort.  */
40 static char *
41 strstr(const char *s1, const char *s2)
42 {
43   abort();
44 }
45 #endif
46