modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/builtins/strncat.c (about)

     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  }