[讨论]C中用setjmp和longjmp实现TRY.CATCH的不足与优越性,见者有分.该怎么解决

/*error.h*/ 
#ifndef _ERROR_H 
#define _ERROR_H 
#include <setjmp.h> 
#include <string.h> 

#define TRY ErrNum = setjmp(Resume);if(0 == ErrNum)
#define CATCH(n) else if((0 != ErrNum) && (((n) == ErrNum) || ((n) == ALL_ERROR)))
#define THROW(n) longjmp((Resume),(n)) 
#define GET_ErrorString(n) errString[n]

typedef enum 
{ 
    ERROR_NONE, 
    ERROR_TEST,
    MEMORY_OFFER,
    DIVSION_BY_ZERO,
    OUT_OF_RUN,
/* 
    加入其它的错误号 
  */
    ALL_ERROR,
}ERROR_E; 

const char* errString[]= 
{ 
    "", 
    "Error Test",
    "Not enough memory", 
    "Divsion by zero",
    "Out of run",
/* 
    加入错误号所对应的错误信息 
*/ 
}; 

int     ErrNum = 0; 
jmp_buf Resume = {0}; 
#endif /*_ERROR_H*/ 


/*main.c*/ 
#include <stdio.h> 
#include <stdlib.h> 
#include "error.h" 
extern int     ErrNum;
int main(void) 
{ 
    int n = 0;
    printf("Input N:"); 
    scanf("%d",&n); 

    TRY 
    { 
       int j = 0;
       if(0 >= n) 
       {
           THROW(ERROR_TEST); 
       }
       else if(n > 0 )
       { 
           printf("N is:%d\n",n); 
       }
       while (1)
       {
           j++;
           if(j > 100000)
              THROW(OUT_OF_RUN);
       }

    } 
    CATCH(ALL_ERROR)
    { 
        printf("%s,ErrNum:%d!\n",GET_ErrorString(ErrNum),ErrNum); 
        exit(ErrNum); 
    } 
}