C - Remove all comments from a C program

超、凢脫俗 2023-01-09 12:39 123阅读 0赞

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/*
     * Write a program to remove all comments from a C program.
     * Don't forget to handle quoted strings and character constants properly.
     * C comments don't nest.
     *
     * RemoveComment.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 in_comment, len;
    	int in_quote;
    	int t;
    
    	in_comment = in_quote = t = 0;
    	while ((len = GetLine()) > 0)
    	{
    		t = 0;
    		while (t < len)
    		{
    			if (line[t] == '"')
    			{
    				in_quote = 1;
    			}
    			if (!in_quote)
    			{
    				if (line[t] == '/' && line[t + 1] == '*')
    				{
    					t = t + 2;
    					in_comment = 1;
    				}
    				if (line[t] == '*' && line[t + 1] == '/')
    				{
    					t = t + 2;
    					in_comment = 0;
    				}
    				if (in_comment == 1)
    				{
    					t++;
    				}
    				else
    				{
    					printf("%c", line[t]);
    					t++;
    				}
    			}
    			else
    			{
    				printf("%c", line[t]);
    				t++;
    			}
    		}
    	}
    
    	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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