c语言抛出异常处理代码

矫情吗；* 2022-05-09 22:22 161阅读 0赞

try catch在java和c++中是有现成实现的，但是在c语言中是买有的，下面实现是来自网络上其他人提供的宏定义方法，该方法有一定的局限性，但是也有不少启发。

下面是一段例子代码，需要使用的人可以自行修改。

#include <stdio.h>
    #include <string.h>
    
    #define BEGIN_PROC int _error_code = 0; int _error_line = 0; int _ret = 0; {
    #define END_PROC }
    #define CATCH_ERROR _tabError: {
    #define END_ERROR }
    
    #define COND(Condition, ErrorCode) do\
    {\
    	if(!(Condition))\
    	{\
    		_error_code = ErrorCode;\
    		_error_line = __LINE__;\
    		goto _tabError;\
    	}\
    }while(0)
    
    #define THROW(errorCode) do{_error_code = errorCode; _error_line = __LINE__; goto _tabError;}while(0)
    #define EXEC(Func, code) do\
    {\
    	_ret = (Func);\
    	if(code != _ret)\
    	{\
    		_error_line = __LINE__;\
    		_error_code = _ret;\
    		goto _tabError;\
    	}\
    }while(0)
    
    #define PRINT_ERROR() printf("error occured in function:%s, line:%d, error_code:%d\n", __FUNCTION__, _error_line, _error_code)
    #define RETURN() return _error_code
    
    #define M_ok					0x000000
    #define M_array_out_of_index	0x000001
    #define M_MeMory_alloc_fail		0x000002
    #define M_open_file_fail		0x000003
    #define M_close_file_fail		0x000004
    
    int func1(int index);
    int func2(const char *filepath);
    int func3(const char *filepath);
    
    int func1(int index)
    {
    	int a[20] = {0};
    	for(int i=0; i<20; i++)
    		a[i] = i+4;
    
    	BEGIN_PROC
    		COND(index >= 0 && index < 20, M_array_out_of_index);
    
    		return a[index];
    	END_PROC
    
    	CATCH_ERROR
    		PRINT_ERROR();
    
    		RETURN();
    	END_ERROR
    }
    
    int func2(const char *filepath)
    {
    	BEGIN_PROC
    		EXEC(func3(filepath), M_ok);
    
    		return M_ok;
    	END_PROC
    
    	CATCH_ERROR
    		PRINT_ERROR();
    
    		RETURN();
    	END_ERROR
    }
    
    int func3(const char *filepath)
    {
    	FILE *fp = NULL;
    	fp = fopen(filepath, "r");
    	if(fp == NULL)
    		return M_open_file_fail;
    	
    	int ret = fclose(fp);
    	if(ret == 0)
    		return M_ok;
    	else
    		return M_close_file_fail;
    }
    
    int main()
    {
    
    	int res = 0;
    
    	res = func1(10);
    	printf("func1 = %d\n", res);
    	
    	res = func1(-11);
    	printf("func1 = %d\n", res);
    	
    	func2("/bin/xxxx");
    	
    	func2("/bin/bash");
    }

编译运行结果

rt@ubuntu:~/c thouw$ ./thouw 
    func1 = 14
    error occured in function:func1, line:51, error_code:1
    func1 = 1
    error occured in function:func2, line:66, error_code:3