/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

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 permitted provided that the following conditions are met:

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 conditions, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
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 contributors may be used to endorse or promote products derived from this software
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 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

*****************************************************************************************/

#include <ubixos/tty.h>
#include <ubixos/kpanic.h>
#include <ubixos/spinlock.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>
#include <string.h>

static tty_term *terms          = 0x0;
tty_term *tty_foreground = 0x0;

int tty_init() {
  int i = 0x0;

  /* Allocate memory for terminals */

  terms = (tty_term *)kmalloc(sizeof(tty_term)*TTY_MAX_TERMS);
  if (terms == 0x0)
    kpanic("tty_init: Failed to allocate memory\n");

  for (i = 0x0;i < TTY_MAX_TERMS;i++) {
    terms[i].tty_buffer = (char *)kmalloc(80*60*2);
    if (terms[i].tty_buffer == 0x0)
      kpanic("tty_init: Failed to allocate buffer memory\n"); 
    terms[i].tty_pointer  = terms[i].tty_buffer;
    terms[i].tty_x        = 0x0;
    terms[i].tty_y        = 0x0;
    terms[i].tty_colour   = 0x0A + i;
    terms[i].tty_stdin    = 0x0;
    terms[i].tty_spinLock = SPIN_LOCK_INITIALIZER;
    }
    
  terms[0].tty_pointer = (char *)0xB8000;
 
  tty_foreground            = &terms[0x0];
  tty_foreground->tty_stdin = 0x1;
  kprintf("tty0 - Initialized\n");

  return(0x0);
  }

int tty_change(uInt16 tty) {

  /* Copy text buffer to tty buffer */
  memcpy(tty_foreground->tty_buffer,(char *)0xB8000,(80*60*2));
  
  /* Copy tty buffer to text buffer */
  memcpy((char *)0xB8000,terms[tty].tty_buffer,(80*60*2));
  
  /*
     Set tty_pointer to internal buffer so non foreground app can
     still continue to write to a text buffer.
  */
  tty_foreground->tty_pointer = tty_foreground->tty_buffer;
  tty_foreground->tty_stdin   = 0x0;
  
  /*
     Set tty_pointer to the text buffer so it becomes the foreground
     terminal.
  */
  terms[tty].tty_pointer = (char *)0xB8000;
  terms[tty].tty_stdin   = 0x1;
  
  /* Lastly set tty_current to tty so we know what now is the current tty */
  tty_foreground = &terms[tty];
  
  /* Return 0x0 so we know all went well */
  return(0x0);
  }
   
int tty_print(char *string,tty_term *term) {
  uInt16 bufferOffset = 0x0, i = 0x0;
  char   character = 0x0;
  /* Aquire spinlock for term */
  spinLock(&term->tty_spinLock);
  
  /* We Need To Get The Y Position */
  bufferOffset = term->tty_y;
  bufferOffset <<= 8;
  
  /* Then We Need To Add The X Position */
  bufferOffset += term->tty_x;
  bufferOffset <<= 1;

  while ((character = *string++)) {
    switch (character) {
    case '\n':
      bufferOffset = (bufferOffset / 160) * 160 + 160;
      break;
    default:
      term->tty_pointer[bufferOffset++] = character;
      term->tty_pointer[bufferOffset++] = term->tty_colour;
      break;
      }
    
    
    /* Check To See If We Are Out Of Bounds */
    if (bufferOffset >= 160 * 25) {
      for (i = 0; i < 160 * 24; i++) {
        term->tty_pointer[i] = term->tty_pointer[i + 160];
        }
      for (i = 0; i < 80; i++) {
        term->tty_pointer[(160 * 24) + (i * 2)] = 0x20;
        term->tty_pointer[(160 * 24) + (i * 2) + 1] = term->tty_colour;
        }
      bufferOffset -= 160;
      }
    }
    
  /* Set Up new cursor position */
  bufferOffset >>= 1;
  term->tty_x = (bufferOffset & 0xFF);
  term->tty_y = (bufferOffset >> 8);
  
  spinUnlock(&term->tty_spinLock);
  return(0x0);
  }
  
tty_term *tty_find(uInt16 tty) {
  return(&terms[tty]);
  }
  
int tty_backspace() {
  uInt32 bufferOffset = 0x0;
  
  /* We Need To Get The Y Position */
  bufferOffset = tty_foreground->tty_y;
  bufferOffset <<= 8;
  
  /* Then We Need To Add The X Position */
  bufferOffset += tty_foreground->tty_x;
  bufferOffset <<= 1;
  
  tty_foreground->tty_pointer[bufferOffset--] = 0x20;
  tty_foreground->tty_pointer[bufferOffset--] = tty_foreground->tty_colour;
  tty_foreground->tty_pointer[bufferOffset]   = 0x20;
  
  bufferOffset >>= 1;
  tty_foreground->tty_x = (bufferOffset & 0xFF);
  tty_foreground->tty_y = (bufferOffset >> 8);
  return(0x0);
  }

/***
 $Log$
 Revision 1.2  2004/08/04 08:17:57  reddawg
 tty: we have primative ttys try f1-f5 so it is easier to use and debug
      ubixos

 Revision 1.1  2004/08/03 21:44:24  reddawg
 ttys

 END
 ***/