/* 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; } int main (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 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; }