1extern void abort (void);
2typedef __SIZE_TYPE__ size_t;
3extern size_t strlen(const char *);
4extern char *strchr(const char *, int);
5extern int strcmp(const char *, const char *);
6extern int strncmp(const char *, const char *, size_t);
7extern int inside_main;
8extern const char *p;
9
10__attribute__ ((used))
11char *
12my_strstr (const char *s1, const char *s2)
13{
14  const size_t len = strlen (s2);
15
16#ifdef __OPTIMIZE__
17  /* If optimizing, we should be called only in the strstr (foo + 2, p)
18     case.  All other cases should be optimized.  */
19  if (inside_main)
20    if (s2 != p || strcmp (s1, "hello world" + 2) != 0)
21      abort ();
22#endif
23  if (len == 0)
24    return (char *) s1;
25  for (s1 = strchr (s1, *s2); s1; s1 = strchr (s1 + 1, *s2))
26    if (strncmp (s1, s2, len) == 0)
27      return (char *) s1;
28  return (char *) 0;
29}
30
31char *
32strstr (const char *s1, const char *s2)
33{
34  if (inside_main)
35    abort ();
36
37  return my_strstr (s1, s2);
38}
39