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/* types.c -- find out size of data types */
/*
output on Mac OS X PPCi, memory model ILP32
type bytes
-----------------
char 1
char * 4
void * 4
short int 2
int 4
long 4
long int 4
long long int 8
float 4
double 8
wchar_t 4
size_t 4
off_t 4
time_t 4
intptr_t 4
output on Windows MinGW 32-bit
type bytes
-----------------
char 1
char * 4
void * 4
short int 2
int 4
long 4
long int 4
long long int 8
float 4
double 8
long double 12
wchar_t 2
size_t 4
off_t 4
time_t 4
intptr_t 4
output on AMD64 and Intel dual Core 2, memory model LP64
type bytes
-----------------
char 1
char * 8
void * 8
short int 2
int 4
long 8
long int 8
long long int 8
float 4
double 8
long double 16
wchar_t 4
size_t 8
off_t 8
time_t 8
intptr_t 8
LLP64 Windows when compiling with tdm gcc 64-bit
type bytes
-----------------
char 1
char * 8
void * 8
short int 2
int 4
long 4
long int 4
long long int 8
float 4
double 8
long double 16
wchar_t 2
size_t 8
off_t 4
time_t 8
intptr_t 8
*/
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <fcntl.h>
#include <locale.h>
#include <inttypes.h>
#ifndef time_t
#include <time.h>
#endif
typedef struct {
char one;
short int two;
int four;
} alignment1;
typedef struct {
char one;
int four;
short int two;
} alignment2;
typedef struct {
char one;
short int two;
long three;
int four;
} alignment3;
typedef struct {
char one;
long three;
short int two;
int four;
} alignment4;
#define str2cmp(s1,s2) ( ( (*(unsigned char *)(s1) << 8) | *((unsigned char *)(s1) + 1) ) - \
( (*(unsigned char *)(s2) << 8) | *((unsigned char *)(s2) + 1) ) )
void printMemoryModel(void);
int main(int argc, char * argv[])
{
int endian = 1;
long long int x, y, z;
alignment1 checkstruct1;
alignment2 checkstruct2;
alignment3 checkstruct3;
alignment4 checkstruct4;
printf("\n");
printf("type bytes\n");
printf("-----------------\n");
printf("char %lu\n", sizeof(char));
printf("char * %lu\n", sizeof(char *));
printf("void * %lu\n", sizeof(void *));
printf("short int %lu\n", sizeof(short int));
printf("int %lu\n", sizeof(int));
printf("long %lu\n", sizeof(long));
printf("long int %lu\n", sizeof(long int));
printf("long long int %lu\n", sizeof(long long int));
printf("float %lu\n", sizeof(float));
printf("double %lu\n", sizeof(double));
printf("long double %lu\n", sizeof(long double));
printf("wchar_t %lu\n", sizeof(wchar_t));
printf("size_t %lu\n", sizeof(size_t));
printf("off_t %lu\n", sizeof(off_t));
printf("time_t %lu\n", sizeof(time_t));
#if defined(_INTTYPES_H_)
printf("intptr_t %lu\n", sizeof(intptr_t));
#endif
printf("\nAlignment:\n");
printf("size of struct {char, short int, int} is: %ld\n", sizeof(checkstruct1));
printf("size of struct {char, int, short int} is: %ld\n", sizeof(checkstruct2));
printf("size of struct {char, short int, long, int} is: %ld\n", sizeof(checkstruct3));
printf("size of struct {char, long, short int, int} is: %ld\n", sizeof(checkstruct4));
printf("\n");
printf("format input output\n");
printf("--------------------------------------------------\n");
printf("%%d 0x7fffffff %d\n", 0x7fffffff);
printf("%%d 0x80000000 %d\n", 0x80000000);
printf("%%d 0xffffffff %d\n", 0xffffffff);
printf("%%u 0x7fffffff %u\n", 0x7fffffff);
printf("%%u 0x80000000 %u\n", 0x80000000);
printf("%%u 0xffffffff %u\n", 0xffffffff);
#ifndef TRUE64
/* will handle either 32bit or 64bit depending on platform
printf("%%ld 0x7fffffffffffffffL %ld\n", 0x7FFFFFFFL);
printf("%%ld 0x8000000000000000L %ld\n", 0x80000000L);
printf("%%ld 0xffffffffffffffffL %ld\n", 0xFFFFFFFFL);
printf("%%lu 0x7fffffffffffffffL %lu\n", 0x7FFFFFFFL);
printf("%%lu 0x8000000000000000L %lu\n", 0x80000000L);
printf("%%lu 0xffffffffffffffffL %ld\n", 0xFFFFFFFFL);
*/
#endif
printf("%%llx 0x7FFFFFFFFFFFFFFFLL %llx\n", 0x7FFFFFFFFFFFFFFFLL);
printf("%%llx 0x8000000000000000LL %llx\n", 0x8000000000000000LL);
printf("%%llx 0xFFFFFFFFFFFFFFFFLL %llx\n", 0xFFFFFFFFFFFFFFFFLL);
printf("%%llX 0x7fffffffffffffffLL %llX\n", 0x7fffffffffffffffLL);
printf("%%llX 0x8000000000000000LL %llX\n", 0x8000000000000000LL);
printf("%%llX 0xffffffffffffffffLL %llX\n", 0xffffffffffffffffLL);
#ifndef TRU64
printf("%%lld 0x7fffffffffffffffLL %lld\n", 0x7fffffffffffffffLL);
printf("%%lld 0x8000000000000000LL %lld\n", 0x8000000000000000LL);
printf("%%lld 0xffffffffffffffffLL %lld\n", 0xffffffffffffffffLL);
printf("%%llu 0x7fffffffffffffffLL %lld\n", 0x7fffffffffffffffLL);
printf("%%llu 0x8000000000000000LL %llu\n", 0x8000000000000000LL);
printf("%%llu 0xffffffffffffffffLL %llu\n", 0xffffffffffffffffLL);
#else
printf("%%ld 0x7fffffffffffffffLL %ld\n", 0x7FFFFFFFFFFFFFFFLL);
printf("%%ld 0x8000000000000000LL %ld\n", 0x8000000000000000LL);
printf("%%ld 0xffffffffffffffffLL %ld\n", 0xFFFFFFFFFFFFFFFFLL);
printf("%%lu 0x7fffffffffffffffLL %lu\n", 0x7FFFFFFFFFFFFFFFLL);
printf("%%lu 0x8000000000000000LL %lu\n", 0x8000000000000000LL);
printf("%%lu 0xffffffffffffffffLL %ld\n", 0xFFFFFFFFFFFFFFFFLL);
#endif
printf("\n");
if(*(char *)&endian == 1)
printf("CPU is little endian\n");
else
printf("CPU is big endian\n");
#ifdef __LITTLE_ENDIAN__
printf("The constant __LITTLE_ENDIAN__ is defined by the compiler\n");
#endif
#ifdef __BIG_ENDIAN__
printf("The constant __BIG_ENDIAN__ is defined by the compiler\n");
#endif
printMemoryModel();
printf("\n");
/*
x = 9223372036854775807LL;
y = 1000LL;
z = x * y;
printf("\n9223372036854775807 * 1000 = %ld <- should be -1000\n", z);
x = 11;
y = -4;
z = x % y;
printf("11 %% -4 = %ld <- should be 3\n", z);
setlocale(LC_NUMERIC, "");
printf("$%'.2Lf\n", 123456789.00L);
printf("$%'.2Lf\n", 1234.56L);
printf("$%'.2Lf\n", 123.45L);
*/
exit(0);
}
void printMemoryModel(void)
{
short sc = sizeof(char) * 8;
short ss = sizeof(short) * 8;
short si = sizeof(int) * 8;
short sl = sizeof(long) * 8;
short sp = sizeof(void*) * 8;
printf("\nMemory model is ");
if (si == 32 && sl == 64 && sp == 64) { printf("LP64\n"); return;}
if (si == 64 && sl == 64 && sp == 64) { printf("ILP64\n"); return;}
if (si == 32 && sl == 32 && sp == 64) { printf("LLP64\n"); return;}
if (si == 32 && sl == 32 && sp == 32) { printf("ILP32\n"); return;}
if (si == 16 && sl == 32 && sp == 32) { printf("LP32\n"); return;}
printf("UNKNOWN\n");
}
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