C - Wrap very long lines of input into two or more shorter lines

╰+攻爆jí腚メ 2023-01-12 01:47 97阅读 0赞

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/*
     * Write a program that wraps very long lines of input into two or more shorter lines.
     *
     * WrapLine.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 i, len;
    	int location, spaceholder;
    	const int WRAPLENGTH = 80; /* The max length of a line */
    
    	while ((len = GetLine()) > 0)
    	{
    		if (len < WRAPLENGTH)
    		{
    		}
    		else /* If this is an extra long line then we loop through it replacing
    			 a space nearest to the wrap area with a new line*/
    		{
    			i = 0;
    			location = 0;
    			while (i < len)
    			{
    				if (line[i] == ' ')
    				{
    					spaceholder = i;
    				}
    				if (location == WRAPLENGTH)
    				{
    					line[spaceholder] = '\n';
    					location = 0;
    				}
    				location++;
    				i++;
    			}
    		}
    		printf("%s", line);
    	}
    
    	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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