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glibc/stdlib/tst-limits.c
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/* 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" |