line.c

/*
* Copyright (c) 2012, Toby Jaffey <toby@sensemote.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <ctype.h>

#include "line.h"

#define LINEBUF_SZ 4096

static char linebuf[LINEBUF_SZ+1]; // +1 for null terminator
static uint16_t linebuf_index;

void line_init(void)
{
    linebuf_index = 0;
    linebuf[0] = 0;
}

void line_putc(char c)
{
    if (c == '\n')
    {
        if (linebuf_index < LINEBUF_SZ)
        {
            if (linebuf_index && linebuf[linebuf_index-1] == '\r')
                linebuf[linebuf_index-1] = 0;
            line_rx(linebuf);
            line_init();
        }
        else
        {
            line_init();
        }
    }
    else
    if (linebuf_index < LINEBUF_SZ)
    {
        if (isprint(c))
        {
            linebuf[linebuf_index++] = c;
            linebuf[linebuf_index] = 0;
        }
    }
}