str_echo08.c

#include	"unp.h"

void
str_echo(int sockfd)
{
	long		arg1, arg2;
	ssize_t		n;
	char		line[MAXLINE];

	for ( ; ; ) {
		if ( (n = Readline(sockfd, line, MAXLINE)) == 0)
			return;		/* connection closed by other end */

		if (sscanf(line, "%ld%ld", &arg1, &arg2) == 2)
			snprintf(line, sizeof(line), "%ld\n", arg1 + arg2);
		else
			snprintf(line, sizeof(line), "input error\n");

		n = strlen(line);
		Writen(sockfd, line, n);
	}
}