File: tst-limits.c

package info (click to toggle)
glibc 2.24-11+deb9u4
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 225,852 kB
  • sloc: ansic: 996,505; asm: 261,827; sh: 10,484; makefile: 9,856; cpp: 4,169; python: 3,971; perl: 2,254; awk: 1,753; pascal: 1,521; yacc: 291; sed: 80
file content (72 lines) | stat: -rw-r--r-- 2,061 bytes parent folder | download | duplicates (12)
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
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
/* It is important that this comes first to not hide effects introduced
   by other headers.  */
#include <limits.h>

#include <inttypes.h>
#include <stdio.h>


static long long int
bitval (int bits)
{
  long long int val = 0;
  while (bits-- > 0)
    val |= 1ll << bits;
  return val;
}


static int
do_test (void)
{
  int result = 0;

#define TEST(name, format, expected) \
  printf ("%-12s expected = %-20" format "  actual = %" format "\n",	      \
	  #name ":", expected, name);					      \
  result |= name != expected

  /* The limits from ISO C99.  */

  /* We cannot support anything but 8-bit chars.  */
  TEST (CHAR_BIT, "d", 8);
  TEST (SCHAR_MIN, "d", -128);
  TEST (SCHAR_MAX, "d", 127);
  TEST (UCHAR_MAX, "d", 255);

  TEST (SHRT_MIN, "d", -(1 << (sizeof (short int) * CHAR_BIT - 1)));
  TEST (SHRT_MAX, "d", (1 << (sizeof (short int) * CHAR_BIT - 1)) - 1);
  TEST (USHRT_MAX, "d", (1 << sizeof (short int) * CHAR_BIT) - 1);

  TEST (INT_MIN, "d", (int) -bitval (sizeof (int) * CHAR_BIT - 1) - 1);
  TEST (INT_MAX, "d", (int) bitval (sizeof (int) * CHAR_BIT - 1));
  TEST (UINT_MAX, "u",
	(unsigned int) bitval (sizeof (unsigned int) * CHAR_BIT));

  TEST (LONG_MIN, "ld",
	(long int) -bitval (sizeof (long int) * CHAR_BIT - 1) - 1);
  TEST (LONG_MAX, "ld", (long int) bitval (sizeof (long int) * CHAR_BIT - 1));
  TEST (ULONG_MAX, "lu",
	(unsigned long int) bitval (sizeof (unsigned long int) * CHAR_BIT));

  TEST (LLONG_MIN, "lld", -bitval (sizeof (long long int) * CHAR_BIT - 1) - 1);
  TEST (LLONG_MAX, "lld", bitval (sizeof (long long int) * CHAR_BIT - 1));
  TEST (ULLONG_MAX, "llu",
	(unsigned long long int) bitval (sizeof (unsigned long long int)
					 * CHAR_BIT));

  /* Values from POSIX and Unix.  */
#ifdef PAGESIZE
  TEST (PAGESIZE, "d", getpagesize ());
#elif defined (PAGE_SIZE)
  TEST (PAGE_SIZE, "d", getpagesize ());
#endif

  TEST (WORD_BIT, "d", (int) sizeof (int) * CHAR_BIT);
  TEST (LONG_BIT, "d", (int) sizeof (long int) * CHAR_BIT);

  return result;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"