entry.c

#include "minicrt.h"

#ifdef 	WIN32
#include <Windows.h>
#endif 


extern int main(int argc, char *argv[]);   //outside function "main"
void exit(int);

static void crt_fatal_error(const char * msg)
{
	exit(1);
}

void mini_crt_entry(void)
{
	int ret;
#ifdef WIN32
	int flag = 0;
	int argc = 0;
	char* argv[16];		//most 16 paraments
	char* cl = GetCommandLineA();

	//resolve command line
	argv[0] = cl;
	argc++;
	while(*cl){
		if(*cl == '\"')
			if(flag == 0) flag = 1;
			else flag = 0;
		else if(*cl == ' ' && flag == 0){
			if(*(cl + 1)){
				argv[argc] = cl + 1;    //fill in argv[]
				argc++;
			}
			*cl = '\0';
		}
		cl++
	}
#else
	int argc;
	char** argv;

	char* ebp_reg = 0;
	// ebp_reg = %ebp
	asm("movl %%ebp,%0 \n":"=r"(ebp_reg));
	argc = *(int *)(ebp_reg+4);
	argv = (char **)(ebp_reg+8);
#endif
	if(!mini_crt_heap_init())
		crt_fatal_error("heap initialize failed");
	if(!mini_crt_io_init())
		crt_fatal_error("IO initialize failed");
	ret = main(argc,argv);
	exit(ret);
}

void exit(int exitCode)
{
	//mini_crt_call_exit_routine();
#ifdef WIN32
	ExitProcess(exitCode);
#else
	asm("movl %0,%%ebx \n\t"
	    "movl $1,%%eax \n\t"
	    "int $0x80 \n\t"
	    "hlt	\n\t"::"m"(exitCode));
#endif
}