tail.c

来自「String Pointers to explore how the point」· C语言 代码 · 共 44 行

/* tail.c: pointers 
   bob wilson
   */

#include <stdio.h>
#include "lineholder.h"

int getline(char s[], int lim);

int main(int argc, char *argv[])
{
	char buffer[MAXLEN];
	int i, n = 10;

	if (argc == 2)
		if (*argv[1] == '-') {
			n = 0;
			for (i = 1; *(argv[1] + i) >= '0' && *(argv[1] + i) <='9'; i++) 
				n = 10*n + *(argv[1] + i) - '0';
		}

	init_lineholder(n);

	while(getline(buffer, MAXLEN) > 0)
		insert_line(buffer);
	print_lines();
	print_lines();		/* see if any lines weren't freed */
	return 0;
}

/* getline:  get line into s, return length  */
int getline(char s[], int lim)
{
	int c,i;

	i = 0;
	while (--lim > 0 && (c=getchar()) != EOF && c != '\n')
		s[i++] = c;
	if (c == '\n')
		s[i++] = c;
	s[i] = '\0';
	return i;
}