1  /* Copyright (C) 2000, 2003  Free Software Foundation.
       2  
       3     Ensure all expected transformations of builtin strncat occur and
       4     perform correctly.
       5  
       6     Written by Kaveh R. Ghazi, 11/27/2000.  */
       7  
       8  extern void abort (void);
       9  typedef __SIZE_TYPE__ size_t;
      10  extern char *strncat (char *, const char *, size_t);
      11  extern char *strcpy (char *, const char *);
      12  extern void *memset (void *, int, size_t);
      13  extern int memcmp (const void *, const void *, size_t);
      14  int x = 123;
      15  
      16  /* Reset the destination buffer to a known state. */
      17  #define RESET_DST_WITH(FILLER) \
      18    do { memset (dst, 'X', sizeof (dst)); strcpy (dst, (FILLER)); } while (0)
      19  
      20  void
      21  main_test (void)
      22  {
      23    const char *const s1 = "hello world";
      24    const char *const s2 = "";
      25    char dst[64], *d2;
      26    
      27    RESET_DST_WITH (s1);
      28    if (strncat (dst, "", 100) != dst || memcmp (dst, "hello world\0XXX", 15))
      29      abort();
      30    RESET_DST_WITH (s1);
      31    if (strncat (dst, s2, 100) != dst || memcmp (dst, "hello world\0XXX", 15))
      32      abort();
      33    RESET_DST_WITH (s1); d2 = dst;
      34    if (strncat (++d2, s2, 100) != dst+1 || d2 != dst+1
      35        || memcmp (dst, "hello world\0XXX", 15))
      36      abort();
      37    RESET_DST_WITH (s1); d2 = dst;
      38    if (strncat (++d2+5, s2, 100) != dst+6 || d2 != dst+1
      39        || memcmp (dst, "hello world\0XXX", 15))
      40      abort();
      41    RESET_DST_WITH (s1); d2 = dst;
      42    if (strncat (++d2+5, s1+11, 100) != dst+6 || d2 != dst+1
      43        || memcmp (dst, "hello world\0XXX", 15))
      44      abort();
      45    RESET_DST_WITH (s1); d2 = dst;
      46    if (strncat (++d2+5, s1, 0) != dst+6 || d2 != dst+1
      47        || memcmp (dst, "hello world\0XXX", 15))
      48      abort();
      49    RESET_DST_WITH (s1); d2 = dst;
      50    if (strncat (++d2+5, "", ++x) != dst+6 || d2 != dst+1 || x != 124
      51        || memcmp (dst, "hello world\0XXX", 15))
      52      abort();
      53  
      54    RESET_DST_WITH (s1);
      55    if (strncat (dst, "foo", 3) != dst || memcmp (dst, "hello worldfoo\0XXX", 18))
      56      abort();
      57    RESET_DST_WITH (s1);
      58    if (strncat (dst, "foo", 100) != dst || memcmp (dst, "hello worldfoo\0XXX", 18))
      59      abort();
      60    RESET_DST_WITH (s1);
      61    if (strncat (dst, s1, 100) != dst || memcmp (dst, "hello worldhello world\0XXX", 26))
      62      abort();
      63    RESET_DST_WITH (s1); d2 = dst;
      64    if (strncat (++d2, s1, 100) != dst+1 || d2 != dst+1
      65        || memcmp (dst, "hello worldhello world\0XXX", 26))
      66      abort();
      67    RESET_DST_WITH (s1); d2 = dst;
      68    if (strncat (++d2+5, s1, 100) != dst+6 || d2 != dst+1
      69        || memcmp (dst, "hello worldhello world\0XXX", 26))
      70      abort();
      71    RESET_DST_WITH (s1); d2 = dst;
      72    if (strncat (++d2+5, s1+5, 100) != dst+6 || d2 != dst+1
      73        || memcmp (dst, "hello world world\0XXX", 21))
      74      abort();
      75  
      76    /* Test at least one instance of the __builtin_ style.  We do this
      77       to ensure that it works and that the prototype is correct.  */
      78    RESET_DST_WITH (s1);
      79    if (__builtin_strncat (dst, "", 100) != dst
      80        || memcmp (dst, "hello world\0XXX", 15))
      81      abort();
      82  }