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The dd function you posted would actually copy three times a junk of 1024 bytes, ie. 3K bytes in total.
But I understand your question in such a way that you want to read 3 bytes in at once and do...

They are not getting NULL as return value. That NULL is still the initial NULL from main. The reason is that you only pass a pointers to the function. These pointers will be copied to the function...

First of all, you make a common mistake (http://en.wikipedia.org/wiki/C_file_input/output#EOF_pitfall): getchar() returns an int and not a char. This may cause errors in the != EOF condition
Ok, so...

I think the only way to do this is to scan the input and then have according printfs.


if(!strcmp(argv[1], "int"))
printf("%d\n", sizeof(int));
else if(!strcmp(argv[1], "double")
...

I don't understand why you put your if(IS_WHITE_SPACE) at the end.
Also getchar returns the integer represantation fo a char. I always cast them.
So my approch would be:

int c;

while((c =...