????????????C????printf????????????????????????????????????????????????????????????????????????????????????????????????βΣ??????????????????????????????????????????????????????????1????????????純??func(arg1?? arg2??arg3)?????????????????

????ebp????????????????????????????????????????????????C??????????????????

#include <stdio.h>
enum {
ptChar??
ptInt??
ptFloat??
ptDouble??
};
void printSum(unsigned long paramFormat?? ...)
{
/*??16λ??????????????16λ???????????*/
int paramType = (paramFormat >> 16);
int paramNum = paramFormat & 0xffff;

/*¶mFormat = ebp + 8???????????????*/
unsigned long *pArg = ¶mFormat;
/*ebp + 0x0c?? ????????????*/
pArg++;
switch(paramType)
{
case ptChar:
{
int sum = 0;
for (int i = 0; i < paramNum; i++)
{
char *pValue = (char *)pArg;
sum += *pValue;
pArg++;
}
printf("%d "?? sum);
}
break;
case ptInt:
{
int sum = 0;
for (int i = 0; i < paramNum; i++)
{
int *pValue = (int *)pArg;
sum += *pValue;
pArg++;
}
printf("%d "?? sum);
}
break;
case ptFloat:
{
float sum = 0;
/**/
pArg++;

/*?????????????8?????????????????8*/
for (int i = 0; i < paramNum; i++)
{
float *pValue = (float *)pArg;
sum += *pValue;
pArg++;
pArg++;
}
printf("%f "?? sum);
}
break;
case ptDouble:
{
double sum = 0;
/*?????????????????8?????????????????8*/
for (int i = 0; i < paramNum; i++)
{
double *pValue = (double *)pArg;
sum += *pValue;
pArg++;
pArg++;
}
printf("%f "?? sum);
}
break;
default:
printf("unknowned type! ");
break;
}
}

void main()
{
unsigned long paramFormat = 3;
char a = 1?? b = 2?? c = 3;
printSum(paramFormat?? a?? b?? c);


paramFormat = ptInt << 16;
paramFormat += 3;
int ia = 1?? ib = 2?? ic = 3;
printSum(paramFormat?? ia?? ib?? ic);

paramFormat = ptFloat << 16;
paramFormat += 3;
float fa = 1?? fb = 2?? fc = 3;
printSum(paramFormat?? fa?? fb?? fc);

paramFormat = ptDouble << 16;
paramFormat += 3;
double da = 1?? db = 2?? dc = 3;
printSum(paramFormat?? da?? db?? dc);
}