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stack.c

/*
Copyright (C) 1997-2005 Erwin Waterlander

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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "std_macro.h"
#include "structures.h"
#include "nameset.h"
#include "display.h"
#include "dosdir.h"
#include "WcdStack.h"
#include "Text.h"
#include "wcd.h"
#include "stack.h"


/********************************************************************
 *
 *                 stack_add
 *
 ********************************************************************/

int stack_add(WcdStack ws, char *dir)
{
      ws->lastadded++;

      if(ws->lastadded == ws->maxsize)
            ws->lastadded = 0;

      ws->current = ws->lastadded;

      /* printWcdStack("add ", ws, stdout); */

      /* free old dir string if present */
      if (ws->dir != NULL)
      if((ws->dir[ws->lastadded] != NULL) && (ws->size == ws->maxsize))
      free (ws->dir[ws->lastadded]);

      putElementAtWcdStackDir(textNew(dir), ws->lastadded, ws);

      return(0);
}
/********************************************************************
 *
 *                 stack_read
 *
 ********************************************************************/

int stack_read(WcdStack ws,char *stackfilename)
{

      FILE *infile;
      char tmp[DD_MAXDIR];


      /* open stack-file */
      if  ((ws->maxsize <= 0)||((infile = fopen(stackfilename,"r")) == NULL))
      {
            /* fprintf(stderr,"Wcd: Error opening stack-file %s\n",stackfilename); */
            ws->lastadded = -1;
            ws->current = -1;
      }
      else
      {
            if(fscanf(infile,"%d %d",&ws->lastadded,&ws->current)==2)
            {

                  while( !feof(infile)&&(ws->size < ws->maxsize) )
                  {
                  int len ;
                  /* read a line */
                  len = getline(tmp,DD_MAXDIR,infile);

                  if (len > 0 )
                        addToWcdStackDir(textNew(tmp), ws);
                  }
            }
            else
              {
                  fprintf(stderr,"Wcd: Error parsing stack\n");
                  ws->lastadded = -1;
                  ws->current = -1;
              }

            fclose(infile);

            if (ws->lastadded >= ws->size)
            ws->lastadded = 0;
            if (ws->current >= ws->size)
            ws->current = 0;
      }

 /*   printWcdStack("READ ", ws, stdout); */
      return(0);
}

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

int stack_print(WcdStack ws, int use_numbers, int use_stdout)
{
#ifdef WCD_USECONIO
      if (use_stdout == WCD_STDOUT_NO)
            return display_list_conio(NULL,ws,0,use_numbers);
      else
            return display_list_stdout(NULL,ws,0, use_stdout);
#else
# ifdef WCD_USECURSES
      int i;
      if ((use_stdout == WCD_STDOUT_NO) && ((i = display_list_curses(NULL,ws,0,use_numbers)) != WCD_ERR_CURSES))
            return i;
      else
            return display_list_stdout(NULL,ws,0, use_stdout);
# else
      return display_list_stdout(NULL,ws,0, use_stdout);
# endif
#endif
}
/********************************************************************
 *
 *                 stack_push
 *
 ********************************************************************/

char* stack_push(WcdStack ws, int push_ntimes)
{

      int  new_stack_nr;

      if(ws == NULL)
      return (NULL);
      else
            if( ((ws->size) <= 0) || ((ws->size) > ws->maxsize) )
            return (NULL);
            else
            {

                    push_ntimes = push_ntimes % ws->size;

                    new_stack_nr = ws->current - push_ntimes;

                    if(new_stack_nr < 0)
                    new_stack_nr = ws->size + new_stack_nr;

                    ws->current = new_stack_nr;

                    return(ws->dir[ws->current]);
            }
}
/********************************************************************
 *
 *                 stack_pop
 *
 *
 *
 ********************************************************************/

char* stack_pop(WcdStack ws, int pop_ntimes)
{

      int  new_stack_nr;


      if(ws == NULL)
      return (NULL);
      else
            if( ((ws->size) <= 0) || ((ws->size) > ws->maxsize) )
            return (NULL);
            else
            {
               pop_ntimes = pop_ntimes % ws->size;

               new_stack_nr = ws->current + pop_ntimes;

               if(new_stack_nr > (ws->size -1))
               new_stack_nr =  new_stack_nr - ws->size;

               ws->current = new_stack_nr;
               return(ws->dir[ws->current]);
            }
}
/********************************************************************
 *
 *                 stack_write
 *
 ********************************************************************/

int stack_write(WcdStack ws,char *stackfilename)
{
      FILE *outfile;
      int  i;

      if (ws->maxsize <= 0)
         return(0);
      else
      if ( (outfile = fopen(stackfilename,"w")) == NULL)
      {
            fprintf(stderr,"Wcd: Error opening stack-file %s for write.\n",stackfilename);
            return(0);
      }
      else
      {
            fprintf(outfile,"%d %d\n",ws->lastadded,ws->current);
            for(i=0;((i<ws->size)&&(i<ws->maxsize));i++)
            {
        /*        printf("writing line %d\n",i);  */
                  fprintf(outfile,"%s\n",ws->dir[i]);
            }
            fclose(outfile);
      }
      return(0);
}


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