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Tiny C Runtime Library

, 25 Mar 2007
Reduce code bloat for those simple utility programs by using a streamlined C runtime - now with Unicode support!
// initterm.cpp

// based on:
// LIBCTINY - Matt Pietrek 2001
// MSDN Magazine, January 2001

// 08/12/06 (mv)

#include <windows.h>
#include <malloc.h>
#include "libct.h"

#pragma section(".CRT$XCA", read, write)
#pragma data_seg(".CRT$XCA")		// start of ctor section
_PVFV __xc_a[] = {0};

#pragma section(".CRT$XCZ", read, write)
#pragma data_seg(".CRT$XCZ")		// end of ctor section
_PVFV __xc_z[] = {0};

#pragma data_seg()
#pragma comment(linker, "/merge:.CRT=.rdata")

BEGIN_EXTERN_C

void _initterm(_PVFV *pfbegin, _PVFV *pfend)
{
	// walk the table of function pointers from the bottom up, until
	// the end is encountered.  Do not skip the first entry.  The initial
	// value of pfbegin points to the first valid entry.  Do not try to
	// execute what pfend points to.  Only entries before pfend are valid.
	while (pfbegin < pfend)
	{
		if (*pfbegin != 0)
			(**pfbegin)();
		++pfbegin;
	}
}


static _PVFV *atexitlist = 0;
static unsigned int max_atexit_entries = 0;
static unsigned int cur_atexit_entries = 0;

void _init_atexit()
{
	max_atexit_entries = 128;
	atexitlist = (_PVFV*)calloc(max_atexit_entries, sizeof(_PVFV*));
}

int atexit(_PVFV func)
{
	if (cur_atexit_entries < max_atexit_entries)
	{
		atexitlist[cur_atexit_entries++] = func; 
		return 0;
	}

	return -1;
}

void _doexit()
{
	if (cur_atexit_entries)
	{
		// Use ptr math to find the end of the array
		_initterm(atexitlist, atexitlist + cur_atexit_entries);
	}
}

void exit(int code)
{
	_doexit();
	ExitProcess(code);
}

int _purecall()
{
	ExitProcess((UINT)-1);
}

END_EXTERN_C

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About the Author

Mike_V

United States United States
Mike_V is currently a student at UCLA.
 
After a few years on the Dark Side, he reformed and now chants "Death to VB." His computer-related interests include C++, C#, and ASP.NET (in C#, of course). He writes operating systems in C++ and assembler as a hobby.

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