1 /* Copyright (C) 2000  Free Software Foundation.
2 
3    Ensure all expected transformations of builtin strncpy occur and
4    perform correctly.
5 
6    Written by Kaveh R. Ghazi, 11/25/2000.  */
7 
8 extern void abort (void);
9 typedef __SIZE_TYPE__ size_t;
10 extern char *strncpy (char *, const char *, size_t);
11 extern int strcmp (const char *, const char *);
12 extern int strncmp (const char *, const char *, size_t);
13 extern void *memset (void *, int, size_t);
14 
15 int main ()
16 {
17   const char *const src = "hello world";
18   const char *src2;
19   char dst[64], *dst2;
20 
21   memset (dst, 0, sizeof (dst));
22   if (strncpy (dst, src, 4) != dst || strncmp (dst, src, 4))
23     abort();
24 
25   memset (dst, 0, sizeof (dst));
26   if (strncpy (dst+16, src, 4) != dst+16 || strncmp (dst+16, src, 4))
27     abort();
28 
29   memset (dst, 0, sizeof (dst));
30   if (strncpy (dst+32, src+5, 4) != dst+32 || strncmp (dst+32, src+5, 4))
31     abort();
32 
33   memset (dst, 0, sizeof (dst));
34   dst2 = dst;
35   if (strncpy (++dst2, src+5, 4) != dst+1 || strncmp (dst2, src+5, 4)
36       || dst2 != dst+1)
37     abort();
38 
39   memset (dst, 0, sizeof (dst));
40   if (strncpy (dst, src, 0) != dst || strcmp (dst, ""))
41     abort();
42 
43   memset (dst, 0, sizeof (dst));
44   dst2 = dst; src2 = src;
45   if (strncpy (++dst2, ++src2, 0) != dst+1 || strcmp (dst2, "")
46       || dst2 != dst+1 || src2 != src+1)
47     abort();
48 
49   memset (dst, 0, sizeof (dst));
50   dst2 = dst; src2 = src;
51   if (strncpy (++dst2+5, ++src2+5, 0) != dst+6 || strcmp (dst2+5, "")
52       || dst2 != dst+1 || src2 != src+1)
53     abort();
54 
55   memset (dst, 0, sizeof (dst));
56   if (strncpy (dst, src, 12) != dst || strcmp (dst, src))
57     abort();
58 
59   /* Test at least one instance of the __builtin_ style.  We do this
60      to ensure that it works and that the prototype is correct.  */
61   memset (dst, 0, sizeof (dst));
62   if (__builtin_strncpy (dst, src, 4) != dst || strncmp (dst, src, 4))
63     abort();
64 
65   return 0;
66 }
67 
68 #ifdef __OPTIMIZE__
69 /* When optimizing, all the above cases should be transformed into
70    something else.  So any remaining calls to the original function
71    should abort.  */
72 static char *
73 strncpy(char *s1, const char *s2, size_t n)
74 {
75   abort();
76 }
77 #endif
78