c語言拋出異常處理代碼

try catch在java和c++中是有現成實現的，但是在c語言中是買有的，下面實現是來自網絡上其他人提供的宏定義方法，該方法有一定的侷限性，但是也有不少啓發。

下面是一段例子代碼，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");
}

編譯運行結果

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