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Full Discussion: How to get the size of the datatype passed as the command line argumet?
Top Forums Programming How to get the size of the datatype passed as the command line argumet? Post 302508010 by Corona688 on Friday 25th of March 2011 11:45:09 AM
Old 03-25-2011
sizeof() doesn't work that way. It happens at compile-time -- the compiler decides what size it is once, and doesn't ever change later. It doesn't understand strings anyway -- you're getting the size of a pointer.

You'll just have to do it by brute force.

Code:
const struct sizes_t
{
        const char *str;
        int size;
} sizes[]={
 { "char", sizeof(char) }, { "short", sizeof(short) }, { "int", sizeof(int) },
 { "long", sizeof(long) }, { NULL, 0 } };

int main(int argc, char *argv[])
{
        int n;
        for(n=0; sizes[n].str != NULL; n++)
        {
                if(strcmp(argv[1], sizes[n].str) == 0)
                {
                        printf("sizeof %s = %d\n", sizes[n].str, sizes[n].size);
                        break;
                }
        }
}

You could do a little checking like, check if the string begins with 'unsigned' and ignore it if so since sizeof(x) == sizeof(unsigned x).
This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT OPENDARWIN

elf32_fsize

elf32_fsize(3ELF)					       ELF Library Functions						 elf32_fsize(3ELF)

NAME

       elf32_fsize, elf64_fsize - return the size of an object file type

SYNOPSIS

       cc [ flag ... ] file ... -lelf [ library ... ]
       #include <libelf.h>

       size_t elf32_fsize(Elf_Type type, size_t count, unsigned ver);

       size_t elf64_fsize(Elf_Type type, size_t count, unsigned ver);

DESCRIPTION

       elf32_fsize() gives the size in bytes of the 32-bit file representation of count data objects with the given type. The library uses version
       ver to calculate the size. See elf(3ELF) and elf_version(3ELF).

       Constant values are available for the sizes of fundamental types:

	      Elf_Type	File Size Memory Size
	      ELF_T_ADDR     ELF32_FSZ_ADDR sizeof(Elf32_Addr)
	      ELF_T_BYTE     1	  sizeof(unsigned char)
	      ELF_T_HALF     ELF32_FSZ_HALF sizeof(Elf32_Half)
	      ELT_T_OFF ELF32_FSZ_OFF  sizeof(Elf32_Off)
	      ELF_T_SWORD    ELF32_FSZ_SWORD	 sizeof(Elf32_Sword)
	      ELF_T_WORD     ELF32_FSZ_WORD sizeof(Elf32_Word)

       elf32_fsize() returns 0 if the value of type or ver is unknown. See elf32_xlatetof(3ELF) for a list of the type values.

       For the 64-bit class, replace 32 with 64 as appropriate.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       elf(3ELF), elf32_xlatetof(3ELF), elf_version(3ELF), libelf(3LIB), attributes(5)

SunOS 5.10							    11 Jul 2001 						 elf32_fsize(3ELF)
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