/* ARISA - Line Driven Socket Functions
 * Copyright (C) 2004 Carl Ritson
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include "arisa.h"

#include <sys/types.h>
#include <sys/socket.h>

#include "line-drive.h"

linebuf_t *alloc_linebuf(size_t msgsize) {
	linebuf_t *lb = xalloc(sizeof(linebuf_t));

	if(msgsize < 64)
		msgsize = 64;
	
	lb->msgsize	= msgsize;
	lb->bufsize	= lb->msgsize + 2;
	lb->buffer	= xalloc(lb->bufsize);
	lb->pos		= 0;
	lb->used 	= 0;

	return lb;
}

void free_linebuf(linebuf_t *lb) {
	xfree(lb->buffer);
	xfree(lb);
}

void clear_linebuf(linebuf_t *lb) {
	lb->buffer[0]	= '\0';
	lb->pos		= 0;
	lb->used	= 0;
}

int linebuf_inuse(linebuf_t *lb) {
	if(lb->pos != 0 || lb->used != 0)
		return 1;
	else
		return 0;
}

size_t copy_linebuf(linebuf_t *lb, char *dst, size_t dstsize) {
	size_t len = IMIN(lb->used, dstsize - 1);
	if(len <= 0)
		return 0;
	xstrncpy(dst,lb->buffer,len + 1);
	return len;
}

void load_linebuf(linebuf_t *lb, char *src) {
	size_t len;
	len = IMIN(
		snprintf(lb->buffer,lb->msgsize,"%s",src),
		lb->msgsize - 1
	);
	lb->used = len;
	lb->pos = len;
}

char *dup_linebuf(linebuf_t *lb) {
	char *line = NULL;
	if(lb->used > 0) {
		line = xalloc(lb->used + 1);
		copy_linebuf(lb,line,lb->used + 1);
	}
	return line;
}

int recv_line(int sok, linebuf_t *lb) {
	int i,ret;
	
	lb->used = 0;
	ret = recv(sok,lb->buffer + lb->pos, 
			(lb->msgsize - lb->pos),MSG_PEEK);
	if(ret <= 0)
		return -1;
	for(i = 0; i < (ret + lb->pos); ++i) {
		if(lb->buffer[i] == '\n') {
			ret = recv(sok,lb->buffer + lb->pos,
					(i+1) - lb->pos,0);
			if(ret <= 0)
				return -1;
			lb->buffer[i] = '\0';
			lb->used = i;
			lb->pos = 0;
			if(i != 0) {
				if(lb->buffer[i-1] == '\r') {
					lb->buffer[i-1] = '\0';
					lb->used--;
				}
			}
			
			return 1;
		}
	}
	ret = recv(sok,lb->buffer + lb->pos,ret,0);
	if(ret <= 0)
		return -1;
	lb->pos += ret;
	if(lb->pos >= lb->msgsize)
		lb->pos = 0;
	return 0;
}

int send_line(int sok, linebuf_t *lb) {
	int ret;

	if(lb->used == 0)
		return 1;
	
	lb->pos = 0;
	ret = send(sok,lb->buffer,lb->used,0);
	if(ret <= 0)
		return -1;

	lb->used -= ret;
	if(lb->used > 0) {
		memmove(lb->buffer, lb->buffer + ret, lb->used + 1);
		return 0;
	} else
		return 1;
}