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