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long_long.c revision 1.11 
      1 /* This test script is part of GDB, the GNU debugger.
      2 
      3    Copyright 1999-2024 Free Software Foundation, Inc.
      4 
      5    This program is free software; you can redistribute it and/or modify
      6    it under the terms of the GNU General Public License as published by
      7    the Free Software Foundation; either version 3 of the License, or
      8    (at your option) any later version.
      9 
     10    This program is distributed in the hope that it will be useful,
     11    but WITHOUT ANY WARRANTY; without even the implied warranty of
     12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13    GNU General Public License for more details.
     14 
     15    You should have received a copy of the GNU General Public License
     16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     17 
     18 /* Test long long expression; test printing in general.
     19  *
     20  * /CLO/BUILD_ENV/Exports/cc -g +e -o long_long long_long.c
     21  *
     22  * or
     23  *
     24  * cc +e +DA2.0 -g -o long_long long_long.c
     25  */
     26 
     27 #include <string.h>
     28 
     29 enum { MAX_BYTES = 16 };
     30 
     31 void
     32 pack (unsigned char b[MAX_BYTES], int size, int nr)
     33 {
     34   static long long val[] = { 0x123456789abcdefLL, 01234567123456701234567LL, 12345678901234567890ULL};
     35   volatile static int e = 1;
     36   int i;
     37   for (i = 0; i < nr; i++)
     38     {
     39       int offset;
     40       if (*(char *)&e)
     41 	/* Little endian.  */
     42 	offset = sizeof (long long) - size;
     43       else
     44 	/* Big endian endian.  */
     45 	offset = 0;
     46       memcpy (b + size * i, (char *) val + sizeof (long long) * i + offset, size);
     47     }
     48 }
     49 
     50 unsigned char b[MAX_BYTES];
     51 unsigned char h[MAX_BYTES];
     52 unsigned char w[MAX_BYTES];
     53 unsigned char g[MAX_BYTES];
     54 
     55 unsigned char c[MAX_BYTES];
     56 unsigned char s[MAX_BYTES];
     57 unsigned char i[MAX_BYTES];
     58 unsigned char l[MAX_BYTES];
     59 unsigned char ll[MAX_BYTES];
     60 
     61 int known_types()
     62 {
     63   /* A union is used here as, hopefully it has well defined packing
     64      rules.  */
     65   struct {
     66     long long bin, oct, dec, hex;
     67   } val;
     68   memset (&val, 0, sizeof val);
     69 
     70   /* Known values, filling the full 64 bits.  */
     71   val.bin = 0x123456789abcdefLL; /* 64 bits = 16 hex digits */
     72   val.oct = 01234567123456701234567LL; /*  = 21+ octal digits */
     73   val.dec = 12345678901234567890ULL;    /*  = 19+ decimal digits */
     74 
     75   /* Stop here and look!  */
     76   val.hex = val.bin - val.dec | val.oct;
     77 
     78   return 0;
     79 }
     80 
     81 int main() {
     82 
     83    /* Pack Byte, Half, Word and Giant arrays with byte-ordered values.
     84       That way "(gdb) x" gives the same output on different
     85       architectures.  */
     86    pack (b, 1, 2);
     87    pack (h, 2, 2);
     88    pack (w, 4, 2);
     89    pack (g, 8, 2);
     90    pack (c, sizeof (char), 2);
     91    pack (s, sizeof (short), 2);
     92    pack (i, sizeof (int), 2);
     93    pack (l, sizeof (long), 2);
     94    pack (ll, sizeof (long long), 2);
     95 
     96    known_types();
     97 
     98    return 0;
     99 }
    100