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