技術標籤：CCwrap long lines

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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;
}