/*------------------------------------------------------------------------------
CMDBUILD.C:  Routine to build up serial commands.

Copyright 1995 KEIL Software, Inc.
------------------------------------------------------------------------------*/

#include <stdlib.h>
#include <ctype.h>
#include "tdp.h"

/*------------------------------------------------------------------------------
------------------------------------------------------------------------------*/
xdata char cmdbuf [1 + MAX_CMD_LEN];
xdata unsigned char cmdndx;

/*------------------------------------------------------------------------------
------------------------------------------------------------------------------*/
void cmdb_init (void)
{
cmdndx = 0;
cmdbuf [0] = '\0';
}

/*------------------------------------------------------------------------------
------------------------------------------------------------------------------*/
void cmdb_prompt (void)
{
com_puts ("COMMAND: ");
com_puts (cmdbuf);
}

/*------------------------------------------------------------------------------
------------------------------------------------------------------------------*/
const char *cmdb_scan (void)
{
int c;

/*------------------------------------------------
------------------------------------------------*/
while (1)
  {
  if ((c = com_getchar ()) == -1)
    break;

  if (c == '\r')
    {
    com_puts ("\r\n");
    return (cmdbuf);
    }

  if ((c == '\b') && (cmdndx != 0))
    {
    com_puts ("\b \b");
    cmdbuf [--cmdndx] = '\0';
    continue;
    }

  if (!isprint (c))
    {
  BEEPCHAR:
    com_putchar ('\x7');
    continue;
    }

  if (cmdndx >= MAX_CMD_LEN)
    goto BEEPCHAR;

  com_putchar (c);
  cmdbuf [cmdndx++] = (unsigned char) c;
  cmdbuf [cmdndx]   = '\0';
  }

/*------------------------------------------------
------------------------------------------------*/
return (NULL);
}

/*------------------------------------------------------------------------------
------------------------------------------------------------------------------*/