readln.c

聊天程序~使用LINUX c 语言实现~

/* readln.c - readln, recvln */

#include <cnaiapi.h>
#include <stdio.h>

int readln(char *buff, int buffsz) {

	char	*bp = buff, c;
	int	n;

	while(bp - buff < buffsz && 
	      (n = read(STDIN_FILENO, bp, 1)) > 0) {
		if (*bp++ == '\n')
			return (bp - buff);
	}

	if (n < 0)
		return -1;

	if (bp - buff == buffsz)
		while (read(STDIN_FILENO, &c, 1) > 0 && c != '\n');

	return (bp - buff);
}


int recvln(connection conn, char *buff, int buffsz) {

	char	*bp = buff, c;
	int	n;

	while(bp - buff < buffsz && 
	      (n = recv(conn, bp, 1, 0)) > 0) {
		if (*bp++ == '\n')
			return (bp - buff);
	}

	if (n < 0)
		return -1;

	if (bp - buff == buffsz)
		while (recv(conn, &c, 1, 0) > 0 && c != '\n');

	return (bp - buff);
}