/* RCS      -- $Header: /u/dvadura/src/generic/dmake/src/RCS/state.c,v 1.2 1992/04/07 04:42:46 dvadura Exp $
-- SYNOPSIS -- .KEEP_STATE state file management
-- 
-- DESCRIPTION
-- 	Three routines to interface to the .KEEP_STATE state file.
--
--		Read_state()	- reads the state file if any.
--		Write_state()	- writes the state file.
--
--		Check_state(cp,how) - checks an entry returns 0 or 1
--				      and updates the entry.
--
-- AUTHOR
--      Dennis Vadura, dvadura@watdragon.uwaterloo.ca
--      CS DEPT, University of Waterloo, Waterloo, Ont., Canada
--
-- COPYRIGHT
--      Copyright (c) 1990 by Dennis Vadura.  All rights reserved.
-- 
--      This program is free software; you can redistribute it and/or
--      modify it under the terms of the GNU General Public License
--      (version 1), as published by the Free Software Foundation, and
--      found in the file 'LICENSE' included with this distribution.
-- 
--      This program is distributed in the hope that it will be useful,
--      but WITHOUT ANY WARRANTY; without even the implied warrant 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., 675 Mass Ave, Cambridge, MA 02139, USA.
--
-- LOG
--     $Log: state.c,v $
 * Revision 1.2  1992/04/07  04:42:46  dvadura
 * Removed a parameter to call of Closefile(), it doesn't need one.
 *
 * Revision 1.1  1992/01/24  03:27:05  dvadura
 * dmake Version 3.8, Initial revision
 *
*/

#include "extern.h"

typedef struct se {
   char		*st_name;		/* name of cell		*/
   uint32	st_nkey;		/* name hash key	*/
   int		st_count;		/* how count for how	*/
   uint32	st_dkey;		/* directory hash key	*/
   uint32	st_key;			/* hash key		*/
   struct se    *st_next;
} KSTATE, *KSTATEPTR;

static KSTATEPTR _st_head  = NIL(KSTATE);
static KSTATEPTR _st_tail  = NIL(KSTATE);
static int       _st_upd   = FALSE;
static char     *_st_file  = NIL(char);

static int  _my_fgets ANSI((char *, int, FILE *));

PUBLIC void
Read_state()
{
   char *buf;
   char sizeb[20];
   int  size;
   FILE *fp;
   KSTATEPTR sp;

   if( (fp = Search_file(".KEEP_STATE", &_st_file)) != NIL(FILE) ) {
      if( _my_fgets( sizeb, 20, fp ) ) {
	 size = atol(sizeb);
	 buf = MALLOC(size+2, char);

	 while( _my_fgets(buf, size, fp) ) {
	    TALLOC(sp, 1, KSTATE);
	    sp->st_name = _strdup(buf);
	    (void) Hash(buf, &sp->st_nkey);

	    if( _my_fgets(buf, size, fp) ) sp->st_count = atoi(buf);
	    if( _my_fgets(buf, size, fp) ) sp->st_dkey   = (uint32) atol(buf);

	    if( _my_fgets(buf, size, fp) )
	       sp->st_key = (uint32) atol(buf);
	    else {
	       FREE(sp);
	       break;
	    }

	    if( _st_head == NIL(KSTATE) )
	       _st_head = sp;
	    else
	       _st_tail->st_next = sp;

	    _st_tail = sp;
	 }

	 FREE(buf);
      }

      Closefile();
   }
}


PUBLIC void
Write_state()
{
   static int in_write = 0;
   register KSTATEPTR sp;
   FILE *fp;

   if( !_st_upd || !_st_file || (_st_file && !*_st_file) ||
       Trace || in_write ) return;

   in_write++;
   if( (fp = Openfile(_st_file, TRUE, TRUE)) != NIL(FILE) ) {
      int maxlen = 0;
      int tmplen;

      for( sp = _st_head; sp; sp=sp->st_next )
	 if( (tmplen = strlen(sp->st_name)+2) > maxlen )
	    maxlen = tmplen;

      /* A nice arbitrary minimum size */
      if( maxlen < 20 ) maxlen = 20;
      fprintf( fp, "%d\n", maxlen );

      for( sp = _st_head; sp; sp=sp->st_next ) {
	 uint16 hv;
	 uint32 hk;

	 if( Search_table(Defs, sp->st_name, &hv, &hk) ) {
	    fprintf( fp, "%s\n",  sp->st_name   );
	    fprintf( fp, "%d\n",  sp->st_count );
	    fprintf( fp, "%lu\n", sp->st_dkey   );
	    fprintf( fp, "%lu\n", sp->st_key    );
	 }
      }

      Closefile();
   }
   else
      Fatal("Cannot open STATE file %s", _st_file);

   in_write = 0;
}


PUBLIC int
Check_state( cp, recipes, maxrcp )
CELLPTR cp;
STRINGPTR *recipes;
int  maxrcp;
{
   KSTATEPTR  st;
   STRINGPTR sp;
   int    i;
   uint32 thkey;
   uint32 hkey;
   uint32 nkey;
   uint32 dkey;
   int    update = FALSE;

   if(    strcmp(cp->CE_NAME,".REMOVE") == 0
       || (cp->ce_attr & (A_PHONY|A_NOSTATE)) )
      return(FALSE);

   (void) Hash( cp->CE_NAME, &nkey ); thkey = nkey + (uint32) cp->ce_count;
   (void) Hash( Pwd,  &dkey ); thkey += dkey;

   Suppress_temp_file = TRUE;
   for( i=0 ; i<maxrcp; i++ )
      for(sp=recipes[i]; sp != NIL(STRING); sp=sp->st_next ) {
	 char *cmnd = Expand(sp->st_string);

	 (void) Hash(cmnd, &hkey); thkey += hkey;
	 FREE(cmnd);
      }
   Suppress_temp_file = FALSE;

   for( st=_st_head; st != NIL(KSTATE); st=st->st_next ) {
      if(    st->st_nkey   == nkey
	  && st->st_dkey   == dkey
	  && st->st_count  == cp->ce_count
	  && !strcmp(cp->CE_NAME, st->st_name) )
	 break;
   }

   if( st == NIL(KSTATE) ) {
      KSTATEPTR nst;

      TALLOC(nst, 1, KSTATE);
      nst->st_name = cp->CE_NAME;
      nst->st_nkey = nkey;
      nst->st_dkey = dkey;
      nst->st_key  = thkey;
      nst->st_count = cp->ce_count;

      if( _st_head == NIL(KSTATE) )
	 _st_head = nst;
      else
	 _st_tail->st_next = nst;

      _st_tail = nst;
      _st_upd  = TRUE;
   }
   else if( st->st_key != thkey ) {
      st->st_key = thkey;
      _st_upd = update = TRUE;
   }

   return(st != NIL(KSTATE) && update);
}


static int
_my_fgets(buf, size, fp)
char *buf;
int  size;
FILE *fp;
{
   char *p;

   if( fgets(buf, size, fp) == NULL ) return(0);

   if( (p=strrchr(buf,'\n')) != NIL(char) ) *p='\0';
   return(1);
}