/* $RCSfile: make.c,v $
-- $Revision: 1.6.8.3 $
-- last change: $Author: vq $ $Date: 2006/08/21 04:22:41 $
--
-- SYNOPSIS
--      Perform the update of all outdated targets.
-- 
-- DESCRIPTION
--	This is where we traverse the make graph looking for targets that
--	are out of date, and we try to infer how to make them if we can.
--	The usual make macros are understood, as well as some new ones:
--
--		$$	- expands to $
--		$@      - full target name
--		$*      - target name with no suffix, same as $(@:db)
--			  or, the value of % in % meta rule recipes
--		$?      - list of out of date prerequisites
--		$<      - all prerequisites associated with rules line
--		$&	- all prerequisites associated with target
--		$>      - library name for target (if any)
--		$^	- out of date prerequisites taken from value of $<
-- 
-- AUTHOR
--      Dennis Vadura, dvadura@dmake.wticorp.com
--
-- WWW
--      http://dmake.wticorp.com/
--
-- COPYRIGHT
--      Copyright (c) 1996,1997 by WTI Corp.  All rights reserved.
-- 
--      This program is NOT free software; you can redistribute it and/or
--      modify it under the terms of the Software License Agreement Provided
--      in the file <distribution-root>/readme/license.txt.
--
-- LOG
--      Use cvs log to obtain detailed change logs.
*/

#include "extern.h"
#include "sysintf.h"

typedef struct cell {
   char            *datum;
   struct  cell    *next;
   size_t           len;
} LISTCELL, *LISTCELLPTR;

typedef struct {
   LISTCELLPTR  first;
   LISTCELLPTR  last;
   size_t       len;
} LISTSTRING, *LISTSTRINGPTR;


static	void	_drop_mac ANSI((HASHPTR));
static	void	_set_recipe ANSI((char*, int));
static	void	_set_tmd ANSI(());
static	void	_append_file ANSI((STRINGPTR, FILE*, char*, int));
static  LINKPTR _dup_prq ANSI((LINKPTR));
static  LINKPTR _expand_dynamic_prq ANSI(( LINKPTR, LINKPTR, char * ));
static  char*   _prefix ANSI((char *, char *));
static  char*   _pool_lookup ANSI((char *));
static  int	_explode_graph ANSI((CELLPTR, LINKPTR, CELLPTR));


#define RP_GPPROLOG       0
#define RP_RECIPE         1
#define RP_GPEPILOG       2
#define NUM_RECIPES       3

static STRINGPTR _recipes[NUM_RECIPES];
static LISTCELLPTR _freelist=NULL;

static LISTCELLPTR
get_cell()
{
   LISTCELLPTR cell;

   if (!_freelist) {
      if ((cell=MALLOC(1,LISTCELL)) == NULL)
         No_ram();
   }
   else {
      cell = _freelist;
      _freelist = cell->next;
   }

   return(cell);
}


static void
free_cell(LISTCELLPTR cell)
{
   cell->next = _freelist;
   _freelist = cell;
}


static void
free_list(LISTCELLPTR c)
{
   if(c) {
      free_list(c->next);
      free_cell(c);
   }
}
   
   
static void
list_init(LISTSTRINGPTR s)
{
   s->first = NULL;
   s->last = NULL;
   s->len = 0;
}


static void
list_add(LISTSTRINGPTR s, char *str)
{
   LISTCELLPTR p;
   int l;

   if ((l = strlen(str)) == 0)
      return;

   p = get_cell();
   p->datum = str;
   p->next  = NULL;
   p->len   = l;

   if(s->first == NULL)
      s->first = p;
   else
      s->last->next = p;

   s->last = p;
   s->len += l+1;
}


static char *
list_string(LISTSTRINGPTR s)
{
   LISTCELLPTR next, cell;
   int         len;
   char        *result;
   char        *p;

   if(s->len == 0)
      return(NIL(char));

   if((p = result = MALLOC(s->len, char)) == NULL) No_ram();

   for (cell=s->first; cell; cell=next) {
      memcpy((void *)p, (void *)cell->datum, len=cell->len);
      p += len;
      *p++ = ' ';
      next = cell->next;
      free_cell(cell);
   }

   *--p = '\0';
   list_init(s);
   
   return(result);
}


PUBLIC int
Make_targets()/*
================
   Actually go and make the targets on the target list */
{
   LINKPTR lp;
   int     done = 0;

   DB_ENTER( "Make_targets" );

   Read_state();
   _set_recipe( ".GROUPPROLOG", RP_GPPROLOG );
   _set_recipe( ".GROUPEPILOG", RP_GPEPILOG );

   /* Prevent recipe inference for .ROOT */
   if ( Root->ce_recipe == NIL(STRING) ) {
      TALLOC( Root->ce_recipe, 1, STRING );
      Root->ce_recipe->st_string = "";
   }

   /* Prevent recipe inference for .TARGETS */
   if ( Targets->ce_recipe == NIL(STRING) ) {
      TALLOC( Targets->ce_recipe, 1, STRING );
      Targets->ce_recipe->st_string = "";
   }

   /* Make sure that user defined targets are marked as root targets */
   for( lp = Targets->ce_prq; lp != NIL(LINK); lp = lp->cl_next )
      lp->cl_prq->ce_attr |= A_ROOT;

   while( !done ) {
      int rval;

      if( (rval = Make(Root, NIL(CELL))) == -1 )
	 DB_RETURN(1);
      else
	 done = Root->ce_flag & F_MADE;

      if( !rval && !done ) Wait_for_child( FALSE, -1 );
   }

   for( lp = Targets->ce_prq; lp != NIL(LINK); lp = lp->cl_next ) {
      CELLPTR tgt = lp->cl_prq;
      if( !(tgt->ce_attr & A_UPDATED) )
	 printf( "`%s' is up to date\n", tgt->CE_NAME );
   }

   DB_RETURN( 0 );
}



PUBLIC int
Make( cp, setdirroot )/*
========================  Make a specified target */
CELLPTR cp;
CELLPTR setdirroot;
{
   register LINKPTR dp, prev,next;
   register CELLPTR tcp;
   CELLPTR          nsetdirroot;
   char		    *name, *lib;
   HASHPTR	    m_at, m_q, m_b, m_g, m_l, m_bb, m_up;
   LISTSTRING       all_list, imm_list, outall_list, inf_list;
   char             *all    = NIL(char);
   char             *inf    = NIL(char);
   char             *outall = NIL(char);
   char             *imm    = NIL(char);
   int              rval    = 0; /* 0==ready, 1==target still running, -1==error */
   int		    push    = 0;
   int 		    made    = F_MADE;
   int		    ignore;
   time_t           otime   = (time_t) 1L;
   time_t	    ttime   = (time_t) 1L;
   int		    mark_made = FALSE;

   DB_ENTER( "Make" );
   DB_PRINT( "mem", ("%s:-> mem %ld", cp->CE_NAME, (long) coreleft()) );

   /* Initialize the various temporary storage */
   m_q = m_b = m_g = m_l = m_bb = m_up = NIL(HASH);
   list_init(&all_list);
   list_init(&imm_list);
   list_init(&outall_list);
   list_init(&inf_list);
   
   if (cp->ce_set && cp->ce_set != cp) {
      if( Verbose & V_MAKE )
	 printf( "%s:  Building .UPDATEALL representative [%s]\n", Pname,
	 	 cp->ce_set->CE_NAME );
      cp = cp->ce_set;
   }

   /* If we are supposed to change directories for this target then do so.
    * If we do change dir, then modify the setdirroot variable to reflect
    * that fact for all of the prerequisites that we will be making. */

   nsetdirroot = setdirroot;
   ignore = (((cp->ce_attr|Glob_attr)&A_IGNORE) != 0);
   m_at = Def_macro( "@", cp->ce_fname, M_MULTI );

   if( cp->ce_attr & A_SETDIR ) {
      /* Change directory only if the previous .SETDIR is a different
       * directory from the current one.  ie. all cells with the same .SETDIR
       * attribute are assumed to come from the same directory. */

      if( (setdirroot == NIL(CELL) || setdirroot->ce_dir != cp->ce_dir) &&
          (push = Push_dir(cp->ce_dir,cp->CE_NAME,ignore)) != 0 )
	 setdirroot = cp;
   }

   DB_PRINT( "mem", ("%s:-A mem %ld", cp->CE_NAME, (long) coreleft()) );

   /* FIXME: F_MULTI targets don't have cp->ce_recipe set but the recipes
    * are known nevertheless. It is not necessary to infer them.
    * If (cp->ce_flag & F_MULTI) is true the recipes of the corresponding
    * subtargets can be used. */
   if( cp->ce_recipe == NIL(STRING) ) {
      char *dir = cp->ce_dir;
      
      if( Verbose & V_MAKE )
	 printf( "%s:  Infering prerequisite(s) and recipe for [%s]\n", Pname,
	 	 cp->CE_NAME );

      Infer_recipe( cp, setdirroot );

      /* See if the directory has changed, if it has then make sure we
       * push it. */
      if( dir != cp->ce_dir ) {
	 if( push ) Pop_dir(FALSE);
         push = Push_dir( cp->ce_dir, cp->CE_NAME, ignore );
	 setdirroot = cp;
      }
   }

   for(dp=CeMeToo(cp); dp; dp=dp->cl_next) {
      tcp = dp->cl_prq;
      if( push ) {
	 if( !(tcp->ce_attr & A_POOL) && tcp->ce_dir ) FREE( tcp->ce_dir );
	 tcp->ce_dir   = _pool_lookup(Pwd);
	 tcp->ce_attr |= A_SETDIR|A_POOL;
      }
      tcp->ce_setdir = nsetdirroot;
   }

   DB_PRINT( "mem", ("%s:-A mem %ld", cp->CE_NAME, (long) coreleft()) );
   /* If we have not yet statted the target then do so. */
   if( !(cp->ce_flag & F_STAT) && !(cp->ce_attr&A_PHONY) ) {
      time_t itime = cp->ce_time;

      if (cp->ce_parent && (cp->ce_parent->ce_flag & F_MULTI)) {
	 /* Inherit the stat info from the parent. */
	 cp->ce_time  = cp->ce_parent->ce_time;
	 cp->ce_flag |= F_STAT;
	 /* Propagate the A_PRECIOUS attribute from the parent. */
	 cp->ce_attr |= cp->ce_parent->ce_attr & A_PRECIOUS;
      }
      else {
	 for(dp=CeMeToo(cp); dp; dp=dp->cl_next) {
	    tcp = dp->cl_prq;
	    Stat_target( tcp, TRUE, FALSE );

	    if( tcp->ce_time == (time_t)0L ) {
	       if( tcp->ce_flag & F_INFER )
		  tcp->ce_time = itime;
	    }
	    else {
	       /* File exists so don't remove it later. */
	       tcp->ce_attr |= A_PRECIOUS;
	    }
	       
	    if( Verbose & V_MAKE )
	       printf("%s:  Time stamp of [%s] is %ld\n",Pname,tcp->CE_NAME,
		      tcp->ce_time);
	 }
      }
   }

   DB_PRINT( "make", ("(%s, %ld, 0x%08x, 0x%04x)", cp->CE_NAME,
			cp->ce_time, cp->ce_attr, cp->ce_flag) );

   if( !(cp->ce_flag & F_TARGET) && (cp->ce_time == (time_t) 0L) ) {
      if( Makemkf ) {
	 rval = -1;
	 goto stop_making_it;
      }
      else if( cp->ce_prq != NIL(LINK)
            || (STOBOOL(Augmake) && (cp->ce_flag&F_EXPLICIT)))
	 /* Assume an empty recipe for a target that we have run inference on
	  * but do not have a set of rules for but for which we have inferred
	  * a list of prerequisites. */
	 cp->ce_flag |= F_RULES;
      else
	 Fatal( "`%s' not found, and can't be made", cp->CE_NAME );
   }

   DB_PRINT( "mem", ("%s:-A mem %ld", cp->CE_NAME, (long) coreleft()) );

   /* set value of $* if we have not infered a recipe, in this case $* is
    * the same as $(@:db), this allows us to be compatible with BSD make */
   if( cp->ce_per == NIL(char) ) cp->ce_per = "$(@:db)";

   /* Search the prerequisite list for dynamic prerequisites and if we find
    * them copy the list of prerequisites for potential later re-use. */
   if ( cp->ce_prqorg == NIL(LINK) ) {
      for( dp = cp->ce_prq; dp != NIL(LINK); dp = dp->cl_next )
	 if ( strchr(dp->cl_prq->CE_NAME, '$') != NULL )
	    break;

      if (dp != NIL(LINK)) {
	 cp->ce_prqorg = _dup_prq(cp->ce_prq);
      }
   }

   m_at = Def_macro("@", cp->ce_fname, M_MULTI);

   /* Define conditional macros if any, note this is done BEFORE we process
    * prerequisites for the current target.  Thus the making of a prerequisite
    * is done using the current value of the conditional macro. */
   for(dp=CeMeToo(cp); dp; dp=dp->cl_next) {
      tcp=dp->cl_prq;
      if (tcp->ce_cond != NIL(STRING)) {
	 STRINGPTR sp;

	 tcp->ce_pushed = NIL(HASH);
	 for(sp=tcp->ce_cond; sp; sp=sp->st_next) {
	    if(Parse_macro(sp->st_string,M_MULTI|M_PUSH)) {
	       HASHPTR hp;

	       hp = GET_MACRO(LastMacName);
	       hp->ht_link = tcp->ce_pushed;
	       tcp->ce_pushed = hp;
	    }
	    else {
	      Error("Invalid conditional macro expression [%s]",sp->st_string);
	    }
	 }
      }
   }

   /* First round, will be repeated a second time below. */
   for( prev=NULL,dp=cp->ce_prq; dp != NIL(LINK); prev=dp, dp=next ) {
      int seq;
      int nesting_count;

      /* This is the only macro that needs to be reset while building
       * prerequisites since it is set when we make each prerequisite. */
      if (m_at->ht_value == NIL(char)) {
	 m_at = Def_macro("@", cp->ce_fname, M_MULTI);
      }

      /* Make the prerequisite, note that if the current target has the
       * .LIBRARY attribute set we pass on to the prerequisite the .LIBRARYM
       * attribute and pass on the name of the current target as the library
       * name, and we take it away when we are done.  */
      next = dp->cl_next;

      tcp = dp->cl_prq;
      seq = (((cp->ce_attr | Glob_attr) & A_SEQ) != 0);

      if( tcp->ce_flag & F_VISITED ) {
	 if( _explode_graph(tcp, dp, setdirroot) == 0 ) {
	    /* didn't blow it up so see if we need to wait for it. */
	    if( tcp->ce_flag & F_MADE ) {
	       if( tcp->ce_time > ttime ) ttime = tcp->ce_time;
	       continue;
	    }
	    else
	       goto stop_making_it;
	 }
	 else
	    tcp = dp->cl_prq;
      }

      if( seq && !made ) goto stop_making_it;

      nesting_count = 0;
      while ( tcp
	   && strchr(tcp->CE_NAME, '$')
      ) {
	 if ( nesting_count++ > DynamicNestLevel ) {
	    Fatal( "Dynamic Macro nesting level exceeded [%s]",
		   cp->CE_NAME );
	 }
	 /* Make this prerequisite link point at the real prerequisite we
	  * are after, ie figure out what the dynamic one is and point at it.*/

	 name = Expand( tcp->CE_NAME );
	 if( strcmp(name,cp->CE_NAME) == 0 )
	    Fatal("Detected circular dynamic dependency; generated '%s'",name);

	 /* Call helper for dynamic prerequisite expansion. */
	 dp = _expand_dynamic_prq( cp->ce_prq, dp, name );
	 FREE( name );

	 tcp = dp->cl_prq;
	 if ( tcp ) {
	    next = dp->cl_next;
	 }
      }

      /* Dynamic expansion results in a NULL cell only when the the new
       * prerequisite is already in the prerequisite list.  In this case
       * delete the cell and continue. */
      if ( tcp == NIL(CELL) ) {
	 FREE(dp);
	 if ( prev == NIL(LINK) ) {
	    cp->ce_prq = next;
	    dp = NULL;		/* dp will be the new value of prev. */
	 }
	 else {
	    prev->cl_next = next;
	    dp = prev;
	 }
	 continue;
      }

      if( cp->ce_attr & A_LIBRARY ) {
         tcp->ce_attr |= A_LIBRARYM;
	 tcp->ce_lib   = cp->ce_fname;
      }

      if( (tcp->ce_flag & (F_INFER|F_STAT))==F_INFER && cp->ce_time >= ttime )
	 tcp->ce_time = cp->ce_time;

      /* Propagate the parent's F_REMOVE and F_INFER flags to the children.
       * Make certain to do this AFTER propagating the time, since the
       * time propagation test above uses the F_INFER flag to decide if
       * it should do so. */
      tcp->ce_flag |= cp->ce_flag & (F_REMOVE|F_INFER);

      /* Propagate parents A_ROOT attribute to a child if the parent is a
       * F_MULTI target. */
      if( (cp->ce_flag & F_MULTI) && (cp->ce_attr & A_ROOT) )
	 tcp->ce_attr |= A_ROOT;

      tcp->ce_parent = cp;
      rval |= Make(tcp, setdirroot);

      if( cp->ce_attr & A_LIBRARY )
         tcp->ce_attr ^= A_LIBRARYM;

      if( rval == -1 || (seq && (rval==1)) )
	 goto stop_making_it;

      if( tcp->ce_time > ttime ) ttime = tcp->ce_time;
      made &= tcp->ce_flag & F_MADE;
   }


   /* Do the loop again.  We are most definitely going to make the current
    * cell now.  NOTE:  doing this loop here also results in a reduction
    * in peak memory usage by the algorithm. */

   for( dp = cp->ce_prq; dp != NIL(LINK); dp = dp->cl_next ) {
      int  tgflg;
      tcp  = dp->cl_prq;
      if( tcp == NIL(CELL) )
	 Fatal("Internal Error: Found prerequisite list cell without prerequisite!");

      name = tcp->ce_fname;

      /* make certain that all prerequisites are made prior to advancing. */
      if( !(tcp->ce_flag & F_MADE) ) goto stop_making_it;

      /* If the target is a library, then check to make certain that a member
       * is newer than an object file sitting on disk.  If the disk version
       * is newer then set the time stamps so that the archived member is
       * replaced. */
      if( cp->ce_attr & A_LIBRARY )
	 if( tcp->ce_time <= cp->ce_time ) {
	    time_t mtime = Do_stat( name, tcp->ce_lib, NIL(char *), FALSE );
	    if( mtime < tcp->ce_time ) tcp->ce_time = cp->ce_time+1L;
	 }

      if( tcp->ce_time > otime ) otime = tcp->ce_time;

      list_add(&all_list, name);
      if( (tgflg = (dp->cl_flag & F_TARGET)) != 0 )
         list_add(&inf_list, name);

      if((cp->ce_time<tcp->ce_time) || ((tcp->ce_flag & F_TARGET) && Force)) {
         list_add(&outall_list, name);
         if( tgflg )
            list_add(&imm_list, name);
      }
   }

   all = list_string(&all_list);
   imm = list_string(&imm_list);
   outall = list_string(&outall_list);
   inf = list_string(&inf_list);
   
   DB_PRINT( "mem", ("%s:-C mem %ld", cp->CE_NAME, (long) coreleft()) );
   DB_PRINT( "make", ("I make '%s' if %ld > %ld", cp->CE_NAME, otime,
	      cp->ce_time) );

   if( Verbose & V_MAKE ) {
      printf( "%s:  >>>> Making ", Pname );
      /* Also print the F_MULTI master target. */
      if( cp->ce_flag & F_MULTI )
	 printf( "(::-\"master\" target) " );
      if( cp->ce_count != 0 )
	 printf( "[%s::{%d}]\n", cp->CE_NAME, cp->ce_count );
      else
	 printf( "[%s]\n", cp->CE_NAME );
   }

   m_at = Def_macro( "@", cp->ce_fname, M_MULTI );
   m_g  = Def_macro( ">", cp->ce_lib,   M_MULTI|M_EXPANDED );
   m_q  = Def_macro( "?", outall,       M_MULTI|M_EXPANDED );
   m_b  = Def_macro( "<", inf,          M_MULTI|M_EXPANDED );
   m_l  = Def_macro( "&", all,          M_MULTI|M_EXPANDED );
   m_up = Def_macro( "^", imm,          M_MULTI|M_EXPANDED );
   m_bb = Def_macro( "*", cp->ce_per,   M_MULTI );

   _recipes[ RP_RECIPE ] = cp->ce_recipe;

   /* We attempt to make the target if
    *   1. it has a newer prerequisite
    *   2. It is a target and Force is set
    *   3. It's set of recipe lines has changed.
    */
   if(   Check_state(cp, _recipes, NUM_RECIPES )
      || (cp->ce_time < otime)
      || ((cp->ce_flag & F_TARGET) && Force)
     ) {

      if( Measure & M_TARGET )
	 Do_profile_output( "s", M_TARGET, cp );

      /* Only checking so stop as soon as we determine we will make
       * something */
      if( Check ) {
	 rval = -1;
	 goto stop_making_it;
      }

      if( Verbose & V_MAKE )
	 printf( "%s:  Updating [%s], (%ld > %ld)\n", Pname,
		 cp->CE_NAME, otime, cp->ce_time );

      if( Touch ) {
	 name = cp->ce_fname;
	 lib  = cp->ce_lib;

	 if( (!(Glob_attr & A_SILENT) || !Trace) && !(cp->ce_attr & A_PHONY) ) {
	    if( lib == NIL(char) )
	       printf("touch(%s)", name );
	    else if( cp->ce_attr & A_SYMBOL )
	       printf("touch(%s((%s)))", lib, name );
	    else
	       printf("touch(%s(%s))", lib, name );
	 }

	 if( !Trace && !(cp->ce_attr & A_PHONY) )
	    if( Do_touch( name, lib,
		(cp->ce_attr & A_SYMBOL) ? &name : NIL(char *) ) != 0 )
	       printf( "  not touched - non-existant" );

	 if( (!(Glob_attr & A_SILENT) || !Trace) && !(cp->ce_attr & A_PHONY) )
	    printf( "\n" );

	 Update_time_stamp( cp );
      }
      else if( cp->ce_recipe != NIL(STRING) ) {
	 /* If a recipe is found use it. Note this misses F_MULTI targets. */
	 if( !(cp->ce_flag & F_SINGLE) ) /* Execute the recipes once ... */
	       rval = Exec_commands( cp );
	 else {				 /* or for every out of date dependency
					  * if the ruleop ! was used. */
	    TKSTR tk;

	    _drop_mac( m_q );

	    /* Build all out of date prerequisites. */
	    if( outall && *outall ) {
	       /* Wait for each prerequisite to finish, save the status
		* of Wait_for_completion. */
	       int wait_for_completion_status = Wait_for_completion;
	       Wait_for_completion = TRUE;

	       SET_TOKEN( &tk, outall );

	       /* No need to update the target timestamp until all
		* prerequisites are done. */
	       Doing_bang = TRUE;
	       name = Get_token( &tk, "", FALSE );
	       do {
		  m_q->ht_value = name;

		  rval = Exec_commands( cp );
		  Unlink_temp_files(cp);
	       }
	       while( *(name = Get_token( &tk, "", FALSE )) != '\0' );
	       Wait_for_completion = wait_for_completion_status;
	       Doing_bang = FALSE;
	    }

	    Update_time_stamp( cp );
	    m_q->ht_value = NIL(char);
	 }
      }
      else if( !(cp->ce_flag & F_RULES) && !(cp->ce_flag & F_STAT) &&
	       (!(cp->ce_attr & A_ROOT) || !(cp->ce_flag & F_EXPLICIT)) &&
	       !(cp->ce_count) )
	 /* F_MULTI subtargets should evaluate its parents F_RULES value
	  * but _make_multi always sets the F_RULES value of the master
	  * target. Assume F_RULES is set for subtargets. This might not
	  * be true if there are no prerequisites and no recipes in any
	  * of the subtargets. (FIXME) */
	 Fatal( "Don't know how to make `%s'",cp->CE_NAME );
      else {
         /* Empty recipe, set the flag as MADE and update the time stamp */
         /* This might be a the master cell of a F_MULTI target. */
	 Update_time_stamp( cp );
      }
   }
   else {
      mark_made = TRUE;
   }

   /* Make sure everyone gets remade if Force is set */
   for(dp=CeMeToo(cp); dp; dp=dp->cl_next) {
      tcp=dp->cl_prq;

      if( !(tcp->ce_flag & F_TARGET) && Force ) tcp->ce_time = Do_time();
      if( mark_made ) {
	 tcp->ce_flag |= F_MADE;
	 if( tcp->ce_flag & F_MULTI ) {
	    LINKPTR tdp;
	    for( tdp = tcp->ce_prq; tdp != NIL(LINK); tdp = tdp->cl_next )
	       tcp->ce_attr |= tdp->cl_prq->ce_attr & A_UPDATED;
	 }
      }

      tcp->ce_flag |= F_VISITED;

      /* Note:  If the prerequisite was made using a .SETDIR= attribute
       * 	directory then we will include the directory in the fname
       *        of the target.  */
      if( push ) {
	 char *dir   = nsetdirroot ? nsetdirroot->ce_dir : Makedir;
	 char *pref  = _prefix(dir,tcp->ce_dir);
	 char *nname = Build_path(pref, tcp->ce_fname);

	 FREE(pref);
	 if( (tcp->ce_attr & A_FFNAME) && (tcp->ce_fname != NIL(char)) )
	    FREE( tcp->ce_fname );

	 tcp->ce_fname = DmStrDup(nname);
	 tcp->ce_attr |= A_FFNAME;
      }
   }

stop_making_it:
   _drop_mac( m_g  );
   _drop_mac( m_q  );
   _drop_mac( m_b  );
   _drop_mac( m_l  );
   _drop_mac( m_bb );
   _drop_mac( m_up );
   _drop_mac( m_at );

   /* undefine conditional macros if any */
   for(dp=CeMeToo(cp); dp; dp=dp->cl_next) {
      tcp=dp->cl_prq;

      while (tcp->ce_pushed != NIL(HASH)) {
	 HASHPTR cur = tcp->ce_pushed;
	 tcp->ce_pushed = cur->ht_link;

	 Pop_macro(cur);
	 FREE(cur->ht_name);
	 if(cur->ht_value)
	    FREE(cur->ht_value);
	 FREE(cur);
      }
   }

   while( push-- )
      Pop_dir(FALSE);

   /* Undefine the strings that we used for constructing inferred
    * prerequisites. */
   if( inf    != NIL(char) ) FREE( inf    );
   if( all    != NIL(char) ) FREE( all    );
   if( imm    != NIL(char) ) FREE( imm    );
   if( outall != NIL(char) ) FREE( outall );
   free_list(all_list.first);
   free_list(imm_list.first);
   free_list(outall_list.first);
   free_list(inf_list.first);

   DB_PRINT( "mem", ("%s:-< mem %ld", cp->CE_NAME, (long) coreleft()) );
   DB_RETURN(rval);
}


static char *
_prefix( pfx, pat )
char *pfx;
char *pat;
{
   char *cmp1=pfx;
   char *cmp2=pat;
   char *result = DmStrDup("");
   char *up;

   while(*pfx && *pat) {
      pfx = DmStrSpn(cmp1, DirBrkStr);
      pat = DmStrSpn(cmp2, DirBrkStr);

      cmp1 = DmStrPbrk(pfx, DirBrkStr);
      cmp2 = DmStrPbrk(pat, DirBrkStr);

      if ( (cmp1-pfx) != (cmp2-pat) || strncmp(pfx,pat,cmp1-pfx) != 0 )
	 break;
   }

   up = DmStrJoin("..",DirSepStr,-1,FALSE);
   cmp1 = pfx;
   while ( *(pfx=DmStrSpn(cmp1,DirBrkStr)) != '\0' ) {
      cmp1 = DmStrPbrk(pfx,DirBrkStr);
      result = DmStrJoin(result,up,-1,TRUE);
   }

   cmp2 = pat;
   while ( *(pat=DmStrSpn(cmp2,DirBrkStr)) != '\0' ) {
      char *tmp;
      char *x;
      cmp2 = DmStrPbrk(pat, DirBrkStr);
      tmp = DmStrDup(Build_path(result,x=DmSubStr(pat,cmp2)));
      FREE(result);
      FREE(x);
      result = tmp;
   }

   return(result);
}


static LINKPTR
_dup_prq( lp )
LINKPTR lp;
{
   LINKPTR tlp;

   if( lp == NIL(LINK) ) return(lp);

   TALLOC(tlp, 1, LINK);
   tlp->cl_prq  = lp->cl_prq;
   tlp->cl_flag = lp->cl_flag;
   tlp->cl_next = _dup_prq( lp->cl_next );

   return(tlp);
}


static LINKPTR
_expand_dynamic_prq( head, lp, name )/*
=======================================
   The string name can contain one or more target names. Check if these are
   already a prerequisite for the current target. If not add them to the list
   of prerequisites. If no prerequisites were added set lp->cl_prq to NULL. */
LINKPTR head;
LINKPTR lp;
char *name;
{
   CELLPTR cur = lp->cl_prq;

   /* If condition is true, no space is found. */
   if ( strchr(name, ' ') == NIL(char) ) {
      CELLPTR prq = Def_cell(name);
      LINKPTR tmp;

      for(tmp=head;tmp != NIL(LINK) && tmp->cl_prq != prq;tmp=tmp->cl_next);

      /* If tmp is NULL then the prerequisite is new and is added to the list. */
      if ( !tmp )
	 lp->cl_prq = prq;
   }
   else {
      LINKPTR tlp  = lp;
      LINKPTR next = lp->cl_next;
      TKSTR token;
      char  *p;
      int   first=TRUE;

      /* Handle more than one prerequisite. */
      SET_TOKEN(&token, name);
      while (*(p=Get_token(&token, "", FALSE)) != '\0') {
	 CELLPTR prq = Def_cell(p);
	 LINKPTR tmp;

	 for(tmp=head;tmp != NIL(LINK) && tmp->cl_prq != prq;tmp=tmp->cl_next);
	 
	 /* If tmp is not NULL the prerequisite already exists. */
	 if ( tmp ) continue;

	 /* Add list elements when more then one new prerequisite is found. */
	 if ( first ) {
	    first = FALSE;
	 }
	 else {
	    TALLOC(tlp->cl_next,1,LINK);
	    tlp = tlp->cl_next;
	    tlp->cl_flag |= F_TARGET;
	    tlp->cl_next = next;
	 }

	 tlp->cl_prq = prq;
      }
      CLEAR_TOKEN( &token );
   }

   /* If the condition is true no new prerequisits were found. */
   if ( lp->cl_prq == cur ) {
      lp->cl_prq = NIL(CELL);
      lp->cl_flag = 0;
   }

   return(lp);
}


static void
_drop_mac( hp )/*
================ set a macro value to zero. */
HASHPTR hp;
{
   if( hp && hp->ht_value != NIL(char) ) {
      FREE( hp->ht_value );
      hp->ht_value = NIL(char);
   }
}



static int
_explode_graph( cp, parent, setdirroot )/*
==========================================
   Check to see if we have made the node already.  If so then don't do
   it again, except if the cell's ce_setdir field is set to something other
   than the value of setdirroot.  If they differ then, and we have made it
   already, then make it again and set the cell's stat bit to off so that
   we do the stat again.  */
CELLPTR cp;
LINKPTR parent;
CELLPTR setdirroot;
{
   static CELLPTR removecell = NIL(CELL);
   
   if ( removecell == NIL(CELL) ) 
      removecell = Def_cell(".REMOVE");

   /* we may return if we made it already from the same setdir location,
    * or if it is not a library member whose lib field is non NULL.  (if
    * it is such a member then we have a line of the form:
    *	lib1 lib2 .LIBRARY : member_list...
    * and we have to make sure all members are up to date in both libs. */

   if ( setdirroot == removecell )
      return( 0 );

   if( cp->ce_setdir == setdirroot &&
       !((cp->ce_attr & A_LIBRARYM) && (cp->ce_lib != NIL(char))) )
      return( 0 );

   /* We check to make sure that we are comming from a truly different
    * directory, ie. ".SETDIR=joe : a.c b.c d.c" are all assumed to come
    * from the same directory, even though setdirroot is different when
    * making dependents of each of these targets. */

   if( cp->ce_setdir != NIL(CELL) &&
       setdirroot != NIL(CELL) &&
       cp->ce_dir &&
       setdirroot->ce_dir &&
       !strcmp(cp->ce_dir, setdirroot->ce_dir) )
      return( 0 );

   if( Max_proc > 1 ) {
      LINKPTR dp;

      TALLOC(parent->cl_prq, 1, CELL);
      *parent->cl_prq = *cp;
      cp = parent->cl_prq;
      cp->ce_prq = _dup_prq(cp->ce_prqorg);
      cp->ce_all.cl_prq = cp;
      CeNotMe(cp) = _dup_prq(CeNotMe(cp));

      for(dp=CeNotMe(cp);dp;dp=dp->cl_next) {
	 CELLPTR tcp = dp->cl_prq;
	 TALLOC(dp->cl_prq,1,CELL);
	 *dp->cl_prq = *tcp;
	 dp->cl_prq->ce_flag &= ~(F_STAT|F_VISITED|F_MADE);
	 dp->cl_prq->ce_set   = cp;
      }      
   }
   cp->ce_flag  &= ~(F_STAT|F_VISITED|F_MADE);

   /* Indicate that we exploded the graph and that the current node should
    * be made. */
   return(1);
}



PUBLIC int
Exec_commands( cp )/*
=====================
  Execute the commands one at a time that are pointed to by the rules pointer
  of the target cp if normal (non-group) recipes are defined. If a group recipe
  is found all commands are written into a temporary file first and this
  (group-) shell script is executed all at once.
  If a group is indicated, then the ce_attr determines .IGNORE and .SILENT
  treatment for the group.

  The function returns 0, if the command is executed and has successfully
  returned, and it returns 1 if the command is executing but has not yet
  returned or -1 if an error occured (Return value from Do_cmnd()).

  Macros that are found in recipe lines are expanded in this function, in
  parallel builds this can mean they are expanded before the previous recipe
  lines are finished. (Exception: $(shell ..) waits until all previous recipe
  lines are done.)

  The F_MADE bit in the cell is guaranteed set when the command has
  successfully completed.  */
CELLPTR cp;
{
   static HASHPTR useshell = NIL(HASH);
   static HASHPTR command  = NIL(HASH);
   static         int   read_cmnd = 0;
   register STRINGPTR	rp;
   STRINGPTR            orp;
   char			*cmnd;
   char			*groupfile;
   FILE    		*tmpfile = 0;
   int			do_it;
   t_attr		attr;
   int			group;
   int			trace;
   int			rval  = 0;

   DB_ENTER( "Exec_commands" );

   if( cp->ce_recipe == NIL(STRING) )
      Fatal("Internal Error: No recipe found!");

   attr  = Glob_attr | cp->ce_attr;
   trace = Trace || !(attr & A_SILENT);
   group = cp->ce_flag & F_GROUP;

   /* Do it again here for those that call us from places other than Make()
    * above. */
   orp = _recipes[ RP_RECIPE ];
   _recipes[ RP_RECIPE ] = cp->ce_recipe;

   if( group ) {
      /* Leave this assignment of Current_target here.  It is needed just
       * incase the user hits ^C after the tempfile for the group recipe
       * has been opened. */
      Current_target = cp;
      trace  = Trace || !(attr & A_SILENT);

      if( !Trace ) tmpfile = Start_temp( Grp_suff, cp, &groupfile );
      if( trace )  fputs( "[\n", stdout );

      /* Emit group prolog */
      if( attr & A_PROLOG )
         _append_file( _recipes[RP_GPPROLOG], tmpfile, cp->CE_NAME, trace );
   }

   if( !useshell )
      useshell=Def_macro("USESHELL",NIL(char),M_MULTI|M_EXPANDED);

   if( !read_cmnd ) {
      command = GET_MACRO("COMMAND");
      read_cmnd = 1;
   }

   /* Process commands in recipe. If in group, merely append to file.
    * Otherwise, run them.  */
   for( rp=_recipes[RP_RECIPE]; rp != NIL(STRING); rp=rp->st_next,FREE(cmnd)){
      t_attr a_attr = A_DEFAULT;
      t_attr l_attr;
      char   *p;
      int    new_attr = FALSE;
      int    shell; /* True if the recipe shall run in shell. */

      /* Reset it for each recipe line otherwise tempfiles don't get removed.
       * Since processing of $(mktmp ...) depends on Current_target being
       * correctly set. */
      Current_target = cp;

      /* Only check for +,-,%,@ if the recipe line begins with a '$' macro
       * expansion.  Otherwise there is no way it is going to find these
       * now. */
      if( *rp->st_string == '$' && !group ) {
         t_attr s_attr = Glob_attr;
	 Glob_attr |= A_SILENT;
	 Suppress_temp_file = TRUE;
	 cmnd = Expand(rp->st_string);
	 Suppress_temp_file = FALSE;
	 a_attr |= Rcp_attribute(cmnd);
	 FREE(cmnd);
	 ++new_attr;
	 Glob_attr = s_attr;
      }

      l_attr = attr|a_attr|rp->st_attr;
      shell  = ((l_attr & A_SHELL) != 0);
      useshell->ht_value = (group||shell)?"yes":"no";

      cmnd = Expand( rp->st_string );

      if( new_attr && (p = DmStrSpn(cmnd," \t\n+-@%")) != cmnd )
	 strcpy(cmnd,p);

      /* COMMAND macro is set to "$(CMNDNAME) $(CMNDARGS)" by default, it is
       * possible for the user to reset it to, for example
       *	COMMAND = $(CMNDNAME) @$(mktmp $(CMNDARGS))
       * in order to get a different interface for his command execution. */
      if( command != NIL(HASH) && !group ) {
	 char *cname = cmnd;
         char cmndbuf[30];

	 if ( *(p=DmStrPbrk(cmnd," \t\n")) != '\0' ) {
	    *p = '\0';
	    (void)Def_macro("CMNDARGS",DmStrSpn(p+1," \t\n"),M_MULTI|M_EXPANDED);
	 }
	 else
	    (void) Def_macro("CMNDARGS","",M_MULTI|M_EXPANDED);

	 (void) Def_macro("CMNDNAME",cname,M_MULTI|M_EXPANDED);

         strcpy(cmndbuf, "$(COMMAND)");
	 cmnd = Expand(cmndbuf);
	 FREE(cname); 			/* cname == cmnd at this point. */

	 /* Collect up any new attributes */
	 l_attr |= Rcp_attribute(cmnd);
	 shell  = ((l_attr & A_SHELL) != 0);

	 /* clean up the attributes that we may have just added. */
	 if( (p = DmStrSpn(cmnd," \t\n+-@%")) != cmnd )
	    strcpy(cmnd,p);
      }

      Swap_on_exec = ((l_attr & A_SWAP) != 0);	  /* Swapping for DOS only */
      do_it = !Trace;

      /* We force execution of the recipe if we are tracing and the .EXECUTE
       * attribute was given or if the it is not a group recipe and the
       * recipe line contains the string $(MAKE). Wait_for_completion might
       * be changed gobaly but this is without consequences as we wait for
       * every recipe with .EXECUTE and don't start anything else. */
      if( Trace
       && ((l_attr & A_EXECUTE)||(!group && DmStrStr(rp->st_string,"$(MAKE)")))
      ) {
	 Wait_for_completion |= Trace;
	 do_it = TRUE;
      }

      if( group )
	 /* Append_line() calls Print_cmnd(). */
         Append_line( cmnd, TRUE, tmpfile, cp->CE_NAME, trace, 0 );
      else {
	 /* Don't print empty recipe lines. .ROOT and .TARGETS
	  * deliberately might have empty "" recipes and we don't want
	  * to output empty recipe lines for them. */
	 if ( *cmnd ) {
	    /* Print command and remove continuation sequence from cmnd. */
	    Print_cmnd(cmnd, !(do_it && (l_attr & A_SILENT)), 0);
	 }
	 rval=Do_cmnd(cmnd,FALSE,do_it,cp,(l_attr&A_IGNORE)!=0, shell,
		      rp->st_next == NIL(STRING) );
      }
   }

   /* If it is a group then output the EPILOG if required and possibly
    * execute the command */
   if( group && !(cp->ce_attr & A_ERROR) ) { 
      if( attr & A_EPILOG )	/* emit epilog */
	 _append_file( _recipes[RP_GPEPILOG], tmpfile, cp->CE_NAME, trace );

      if( trace ) fputs("]\n", stdout);

      do_it = !Trace;
      if( do_it )
	{
		Close_temp( cp, tmpfile );
#if defined(UNIX)

 		chmod(groupfile,0700);
#endif
	} 			
      rval = Do_cmnd(groupfile, TRUE, do_it, cp, (attr & A_IGNORE)!=0,
		     TRUE, TRUE);
   }

   _recipes[ RP_RECIPE ] = orp;
   cp->ce_attr &= ~A_ERROR;
   DB_RETURN( rval );
}


PUBLIC void
Print_cmnd( cmnd, echo, map )/*
================================
   This routine is called to print out the command to stdout.  If echo is
   false the printing to stdout is supressed.
   The routine is also used to remove the line continuation sequence
   \<nl> from the command string and convert escape sequences if the
   map flag is set.
   The changed string is used later to actually to execute the command. */
char *cmnd;
int  echo;
int  map;
{
   register char *p;
   register char *n;
   char tmp[3];

   DB_ENTER( "Print_cmnd" );
   
   if( echo ) {
      printf( "%s\n", cmnd  );
      fflush(stdout);
   }

   tmp[0] = ESCAPE_CHAR;
   tmp[1] = CONTINUATION_CHAR;
   tmp[2] = '\0';

   for( p=cmnd; *(n = DmStrPbrk(p,tmp)) != '\0'; )
      /* Remove the \<nl> sequences. */
      if(*n == CONTINUATION_CHAR && n[1] == '\n') {
	 DB_PRINT( "make", ("fixing [%s]", p) );
	 strcpy( n, n+2 );
	 p = n;
      }
      /* Look for an escape sequence and replace it by it's corresponding
       * character value. */
      else {
         if( *n == ESCAPE_CHAR && map ) Map_esc( n );
	 p = n+1;
      }

   DB_VOID_RETURN;
}



/* These routines are used to maintain a stack of directories when making
 * the targets.  If a target cd's to the directory then it is assumed that
 * it will undo it when it is finished making itself. */

static STRINGPTR dir_stack = NIL(STRING);

PUBLIC int
Push_dir( dir, name, ignore )/*
===============================
   Change the current working directory to dir and save the current
   working directory on the stack so that we can come back.
   
   If ignore is TRUE then do not complain about _ch_dir if not possible.*/
char *dir;
char *name;
int  ignore;
{
   STRINGPTR   new_dir;
   int         freedir=FALSE;

   DB_ENTER( "Push_dir" );

   if( dir == NIL(char)  || *dir == '\0' ) dir = Pwd;
   if( *dir == '\'' && dir[strlen(dir)-1] == '\'' ) {
      dir = DmStrDup(dir+1);
      dir[strlen(dir)-1]='\0';
      freedir=TRUE;
   }
   else if (strchr(dir,'$') != NIL(char)) {
      dir = Expand(dir);
      freedir=TRUE;
   }
   else
      dir = DmStrDup(dir);

   if( Set_dir(dir) ) {
      if( !ignore )
         Fatal( "Unable to change to directory `%s', target is [%s]",
	        dir, name );
      if (freedir) FREE(dir);
      DB_RETURN( 0 );
   }

   DB_PRINT( "dir", ("Push: [%s]", dir) );
   if( Verbose & V_DIR_SET )
      printf( "%s:  Changed to directory [%s]\n", Pname, dir  );

   if (freedir) FREE( dir );
   TALLOC( new_dir, 1, STRING );
   new_dir->st_next   = dir_stack;
   dir_stack          = new_dir;
   new_dir->st_string = DmStrDup( Pwd );

   Def_macro( "PWD", Get_current_dir(), M_MULTI | M_EXPANDED );
   _set_tmd();

   DB_RETURN( 1 );
}



PUBLIC void
Pop_dir(ignore)/*
=================
   Change the current working directory to the previous saved dir. */
int ignore;
{
   STRINGPTR old_dir;
   char      *dir;

   DB_ENTER( "Pop_dir" );

   if( dir_stack == NIL(STRING) ) {
      if( ignore ) {
         DB_VOID_RETURN;
      }
      else
	 Error( "Directory stack empty for return from .SETDIR" );
   }

   if( Set_dir(dir = dir_stack->st_string) )
      Fatal( "Could not change to directory `%s'", dir );

   Def_macro( "PWD", dir, M_MULTI | M_EXPANDED );
   DB_PRINT( "dir", ("Pop: [%s]", dir) );
   if( Verbose & V_DIR_SET )
      printf( "%s:  Changed back to directory [%s]\n", Pname, dir);

   old_dir   = dir_stack;
   dir_stack = dir_stack->st_next;

   FREE( old_dir->st_string );
   FREE( old_dir );
   _set_tmd();

   DB_VOID_RETURN;
}



static void
_set_tmd()/*
============
   Set the TMD Macro */
{
   char  *m, *p;
   char  *mend, *pend;
   char  *mtd, *ptd;
   int   mleadslash, pleadslash;
   char  *tmd;
   int   first = 1;

   /* Don't use Get_token because this fails on paths that contain spaces. */
   m = DmStrSpn(Makedir, DirBrkStr);
   mleadslash = m - Makedir;
   p = DmStrSpn(Pwd, DirBrkStr);
   pleadslash = p - Pwd;

   /* leading slashes can only mean POSIX paths or Windows resources (two)
    * slashes. In any case if the number of slashes are not equal there
    * can be no relative path from one two the other. Use the Makedir path. */
   if(mleadslash != pleadslash) {
      tmd = Makedir;
      goto tmd_end;
   }

   /* If Makedir and Pwd are identical skip to the end. */
   for(mend=m, pend=p; *mend && *pend && *mend==*pend; mend++, pend++)
      ;
   if( ( ! *mend ) && ( ! *pend ) ) {
      tmd = DmStrDup( "." );
      goto tmd_end;
   }

   /* If Makedir and Pwd are not identical we will construct TMD. */
   tmd = DmStrDup( "" );

   do {

      /* get the next top directory name */
      mend = DmStrPbrk( m, DirBrkStr );
      /* For DOSish filenames the first part might be a drive letter */
#if !defined(NO_DRIVE_LETTERS)
      if( first && *mend == ':' )
	 mend++;
#endif

      mtd = DmSubStr( m, mend ); /* Free later */
      /* {m|p}end either points to a DirBrkStr member or the end of string. */
      if(*mend) mend++;
      m = mend;

      pend = DmStrPbrk( p, DirBrkStr );
#if !defined(NO_DRIVE_LETTERS)
      if( first && *pend == ':' )
	 pend++;
#endif

      ptd = DmSubStr( p, pend ); /* Free later */
      if(*pend) pend++;
      p = pend;

      if( strcmp(mtd, ptd) ) {	/* they differ */
	 char *tmp = 0;

	 if( first ) {		/* They differ in the first component	*/
	    FREE( tmd );
	    FREE( mtd );
	    FREE( ptd );
	    tmd = Makedir;	/* In this case use the full path	*/
	    break;
	 }

	 if( *ptd ) {
	    /* Build_path puts a DirSepStr behind the first parameter if
	     * its length is greater null, even if the second parameter
	     * is empty. */
	    if(*tmd)
	       tmp = Build_path( "..", tmd );
	    else
	       tmp = "..";
	    FREE( tmd );
	    tmd = DmStrDup( tmp );
	 }
	 if( *mtd ) {
	    tmp = Build_path( tmd, mtd );
	    FREE( tmd );
	    tmd = DmStrDup( tmp );
	 }
      }

      FREE( mtd );
      FREE( ptd );
      first  = 0;
   } while (*m || *p);

tmd_end:

   Def_macro( "TMD", tmd, M_MULTI | M_EXPANDED );
   if( tmd != Makedir ) FREE( tmd );
}


static void
_set_recipe( target, ind )/*
============================
   Set up the _recipes static variable so that the slot passed in points
   at the rules corresponding to the target supplied. */
char *target;
int  ind;
{
   CELLPTR cp;
   HASHPTR hp;

   if( (hp = Get_name(target, Defs, FALSE)) != NIL(HASH) ) {
      cp = hp->CP_OWNR;
      _recipes[ ind ] = cp->ce_recipe;
   }
   else
      _recipes[ ind ] = NIL(STRING);
}



PUBLIC void
Append_line( cmnd, newline, tmpfile, name, printit, map )
char *cmnd;
int  newline;
FILE *tmpfile;
char *name;
int  printit;
int  map;
{
   Print_cmnd( cmnd, printit, map );

   if( Trace ) return;

   fputs(cmnd, tmpfile);
   if( newline ) fputc('\n', tmpfile);
   fflush(tmpfile);

   if( ferror(tmpfile) )
      Fatal("Write error on temporary file, while processing `%s'", name);
}



static void
_append_file( rp, tmpfile, name, printit )
register STRINGPTR rp;
FILE 		   *tmpfile;
char 		   *name;
int 		   printit;
{
   char *cmnd;

   while( rp != NIL(STRING) ) {
      Append_line(cmnd = Expand(rp->st_string), TRUE, tmpfile, name, printit,0);
      FREE(cmnd);
      rp = rp->st_next;
   }
}


#define NUM_BUCKETS	20

typedef struct strpool {
   char 	  *string;	/* a pointer to the string value */
   uint32	  keyval;	/* the strings hash value	 */
   struct strpool *next;	/* hash table link pointer	 */
} POOL, *POOLPTR;

static POOLPTR strings[ NUM_BUCKETS ];

static char *
_pool_lookup( str )/*
=====================
   Scan down the list of chained strings and see if one of them matches
   the string we are looking for. */
char    *str;
{
   register POOLPTR key;
   uint32   keyval;
   uint16   hv;
   uint16   keyindex;
   char     *string;

   DB_ENTER( "_pool_lookup" );

   if( str == NIL(char) ) DB_RETURN("");

   hv  = Hash(str, &keyval);
   key = strings[ keyindex = (hv % NUM_BUCKETS) ];

   while( key != NIL(POOL) )
      if( (key->keyval != keyval) || strcmp(str, key->string) )
	 key = key->next;
      else
	 break;

   if( key == NIL(POOL) ) {
      DB_PRINT( "pool", ("Adding string [%s]", str) );
      TALLOC( key, 1, POOL );			/* not found so add string */
      
      key->string = string = DmStrDup(str);
      key->keyval = keyval;

      key->next           = strings[ keyindex ];
      strings[ keyindex ] = key;
   }
   else {
      DB_PRINT( "pool", ("Found string [%s], key->string") );
      string = key->string;
   }

   DB_RETURN( string );
}