C - Check a C program for rudimentary syntax errors

秒速五厘米 2023-01-09 15:55 102阅读 0赞

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/*
     * Write a program to check a C program for rudimentary syntax errors like
     * unmatched parentheses, brackets and braces. Don’t forget about quotes,
     * both single and double, escape sequences, and comments.
     *
     * SyntaxChecker.c - by FreeMan
     */
    
    #include <stdio.h>
    
    #define MAXLINE 1024 /* Max input line size */
    
    char line[MAXLINE]; /* Current input line */
    int GetLine(void);
    
    int main()
    {
    	int len = 0;
    	int t = 0;
    	int brace = 0, bracket = 0, parenthesis = 0;
    	int singleQuote = 1, doubleQuote = 1;
    
    	while ((len = GetLine()) > 0)
    	{
    		t = 0;
    		while (t < len)
    		{
    			if (line[t] == '{')
    			{
    				brace++;
    			}
    			if (line[t] == '}')
    			{
    				brace--;
    			}
    			if (line[t] == '[')
    			{
    				bracket++;
    			}
    			if (line[t] == ']')
    			{
    				bracket--;
    			}
    			if (line[t] == '(')
    			{
    				parenthesis++;
    			}
    			if (line[t] == ')')
    			{
    				parenthesis--;
    			}
    			if (line[t] == '\'')
    			{
    				singleQuote *= -1;
    			}
    			if (line[t] == '"')
    			{
    				doubleQuote *= -1;
    			}
    			t++;
    		}
    	}
    	if (doubleQuote != 1)
    	{
    		printf("Mismatching double quote mark.\n");
    	}
    	if (singleQuote != 1)
    	{
    		printf("Mismatching single quote mark.\n");
    	}
    	if (parenthesis != 0)
    	{
    		printf("Mismatching parenthesis.\n");
    	}
    	if (bracket != 0)
    	{
    		printf("Mismatching bracket mark.\n");
    	}
    	if (brace != 0)
    	{
    		printf("Mismatching brace mark.\n");
    	}
    	if (brace == 0 && bracket == 0 && parenthesis == 0 && singleQuote == 1 && doubleQuote == 1)
    	{
    		printf("Syntax appears to be correct.\n");
    	}
    
    	return 0;
    }
    
    /* GetLine: Specialized version */
    int GetLine(void)
    {
    	int c, i;
    	extern char line[];
    
    	for (i = 0; i < MAXLINE - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
    	{
    		line[i] = c;
    	}
    	if (c == '\n')
    	{
    		line[i] = c;
    		++i;
    	}
    	line[i] = '\0';
    
    	return i;
    }

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