2462152810
2007/07/29 16:10:54 vq 1.2.6.1: #i10000# Add comments to documents aspects of the inference mechanism.
278 lines
8.6 KiB
C
278 lines
8.6 KiB
C
/* RCS $Id: stat.c,v 1.3 2007-10-15 15:41:38 ihi Exp $
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--
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-- SYNOPSIS
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-- Bind a target name to a file.
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--
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-- DESCRIPTION
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-- This file contains the code to go and stat a target. The stat rules
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-- follow a predefined order defined in the comment for Stat_target.
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--
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-- AUTHOR
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-- Dennis Vadura, dvadura@dmake.wticorp.com
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--
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-- WWW
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-- http://dmake.wticorp.com/
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--
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-- COPYRIGHT
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-- Copyright (c) 1996,1997 by WTI Corp. All rights reserved.
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--
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-- This program is NOT free software; you can redistribute it and/or
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-- modify it under the terms of the Software License Agreement Provided
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-- in the file <distribution-root>/readme/license.txt.
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--
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-- LOG
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-- Use cvs log to obtain detailed change logs.
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*/
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#include "extern.h"
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static int _check_dir_list ANSI((CELLPTR, CELLPTR, int, int));
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#ifdef DBUG
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/* Just a little ditty for debugging this thing */
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static time_t
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_do_stat( name, lib, sym, force )
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char *name;
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char *lib;
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char **sym;
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int force;
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{
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time_t res;
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DB_ENTER( "_do_stat" );
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res = Do_stat(name, lib, sym, force);
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DB_PRINT( "stat", ("Statted [%s,%s,%d,%ld]", name, lib, sym, res) );
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DB_RETURN( res );
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}
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#define DO_STAT(A,B,C,D) _do_stat(A,B,C,D)
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#else
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#define DO_STAT(A,B,C,D) Do_stat(A,B,C,D)
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#endif
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static char *_first; /* If set this variable saves the first pathname that was
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* used to stat the target in, if subsequently a match is
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* found it is overridden by the matched path name. */
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PUBLIC void
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Stat_target( cp, setfname, force )/*
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====================================
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Stat a target. When doing so follow the following rules, suppose
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that cp->CE_NAME points at a target called fred.o:
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(See also man page: BINDING TARGETS)
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0. If A_SYMBOL attribute set look into the library
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then do the steps 1 thru 4 on the resulting name.
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1. Try path's obtained by prepending any dirs found as
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prerequisites for .SOURCE.o.
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2. If not found, do same as 2 but use .SOURCE
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The predefined '.SOURCE : .NULL' targets takes care
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of local/absolute paths.
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3. If not found and .LIBRARYM attribute for the target is
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set then look for it in the corresponding library.
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4. If found in step 0 thru 3, then ce_fname points at
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file name associate with target, else ce_fname points
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at a file name built by the first .SOURCE* dir that
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applied.
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If setfname is != 0 this tells _check_dir_list() to set the static
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_first variable. setfname also controls the use of _first.
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If it is -1 ce_fname (the file name associated with target) is only
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set if a matching file was found and statted, if it is 1 ce_fname
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is set to _first even if target doesn't exist yet.
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If force is TRUE really stat the target. Do not use the directory
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cache but update the files entry if it's enabled. */
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CELLPTR cp;
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int setfname;
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int force;
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{
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register HASHPTR hp;
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static HASHPTR srchp = NIL(HASH);
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char *name;
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char *tmp;
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int res = 0;
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DB_ENTER( "Stat_target" );
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name = cp->CE_NAME;
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DB_PRINT( "stat", ("called on [%s]", name) );
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if( srchp == NIL(HASH) ) srchp = Get_name(".SOURCE",Defs,FALSE);
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/* Look for a symbol of the form lib((symbol)) the name of the symbol
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* as entered in the hash table is (symbol) so pull out symbol and try
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* to find it's module. If successful DO_STAT will return the module
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* as well as the archive member name (pointed at by tmp). We then
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* replace the symbol name with the archive member name so that we
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* have the proper name for any future refrences. */
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if( cp->ce_attr & A_SYMBOL ) {
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DB_PRINT( "stat", ("Binding lib symbol [%s]", name) );
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cp->ce_time = DO_STAT( name, cp->ce_lib, &tmp, force );
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if( cp->ce_time != (time_t) 0L ) {
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/* stat the new member name below note tmp must point at a string
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* returned by MALLOC... ie. the Do_stat code should use DmStrDup */
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if( Verbose & V_MAKE )
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printf( "%s: Mapped ((%s)) to %s(%s)\n", Pname,
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name, cp->ce_lib, tmp );
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FREE( name );
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name = cp->CE_NAME = tmp;
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cp->ce_attr &= ~(A_FFNAME | A_SYMBOL);
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}
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else
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{ DB_VOID_RETURN; }
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}
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_first = NIL(char);
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tmp = DmStrJoin( ".SOURCE", Get_suffix(name), -1, FALSE);
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/* Check .SOURCE.xxx target */
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if( (hp = Get_name(tmp, Defs, FALSE)) != NIL(HASH) )
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res = _check_dir_list( cp, hp->CP_OWNR, setfname, force );
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/* Check just .SOURCE */
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if( !res && (srchp != NIL(HASH)) )
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res = _check_dir_list( cp, srchp->CP_OWNR, setfname, force );
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/* If libmember and we haven't found it check the library */
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if( !res && (cp->ce_attr & A_LIBRARYM) ) {
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cp->ce_time = DO_STAT(name, cp->ce_lib, NIL(char *), force);
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if( !cp->ce_time && Tmd && *Tmd && cp->ce_lib ) {
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char *tmplib;
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tmplib=DmStrDup(Build_path(Tmd,cp->ce_lib));
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if ((cp->ce_time = DO_STAT(name, tmplib, NIL(char *),force)) != (time_t)0L){
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cp->ce_lib=DmStrDup(tmplib);
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}
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}
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if( Verbose & V_MAKE )
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printf( "%s: Checking library '%s' for member [%s], time %ld\n",
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Pname, cp->ce_lib, name, cp->ce_time );
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}
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FREE( tmp );
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if( setfname == 1 || (setfname == -1 && cp->ce_time != (time_t)0L) ) {
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int setlib = (cp->ce_lib == cp->ce_fname);
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if( (cp->ce_attr & A_FFNAME) && (cp->ce_fname != NIL(char)) )
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FREE( cp->ce_fname );
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if( _first != NIL(char) ) {
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cp->ce_fname = _first;
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cp->ce_attr |= A_FFNAME;
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}
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else {
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cp->ce_fname = cp->CE_NAME;
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cp->ce_attr &= ~A_FFNAME;
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}
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if ( setlib ) cp->ce_lib = cp->ce_fname;
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}
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else if( _first )
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FREE( _first );
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/* set it as stated only if successful, this way, we shall try again
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* later. */
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if( cp->ce_time != (time_t)0L ) {
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cp->ce_flag |= F_STAT;
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/* If it is a whatif this changed scenario then return the current
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* time, but do so only if the stat was successful. */
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if ( (cp->ce_attr & A_WHATIF) && !(cp->ce_flag & F_MADE) ) {
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cp->ce_time = Do_time();
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}
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}
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DB_VOID_RETURN;
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}
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static int
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_check_dir_list( cp, sp, setfname, force )/*
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============================================
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Check the list of dir's given by the prerequisite list of sp, for a
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file pointed at by cp. Returns 0 if path not bound, else returns
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1 and replaces old name for cell with new cell name. */
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CELLPTR cp;
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CELLPTR sp;
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int setfname;
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int force;
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{
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/* FIXME: BCC 5.0 BUG??? If lp is assigned to a register variable then
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* BCC 5.0 corrupts a field of the member structure when DO_STAT
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* calls the native win95 stat system call. Blech!!!
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*
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* Making this a static variable forces it out of a register and
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* seems to avoid the problem. */
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static LINKPTR lp;
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char *dir;
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char *path;
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char *name;
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int res = 0;
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int fset = 0;
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DB_ENTER( "_check_dir_list" );
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DB_PRINT( "mem", ("%s:-> mem %ld", cp->CE_NAME, (long) coreleft()) );
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if( sp->ce_prq != NIL(LINK) ) /* check prerequisites if any */
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{
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/* Use the real name instead of basename, this prevents silly
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* loops in inference code, and is consistent with man page */
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name = cp->CE_NAME;
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/* Here we loop through each directory on the list, and try to stat
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* the target. We always save the first pathname we try to stat in
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* _first. If we subsequently get a match we then replace the value of
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* _first by the matched path name. */
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for( lp=sp->CE_PRQ; lp != NIL(LINK) && !res; lp=lp->cl_next ) {
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int nodup = 0;
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dir = lp->cl_prq->CE_NAME;
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if( strchr( dir, '$' ) ) dir = Expand(dir);
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if( strcmp( dir, ".NULL" ) == 0 ) {
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nodup = 1;
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path = cp->CE_NAME;
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} else {
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path = DmStrDup(Build_path(dir,name));
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}
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res = ((cp->ce_time=DO_STAT(path,NIL(char),NIL(char *),force))!=(time_t)0L);
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/* Have to use DmStrDup to set _first since Build_path, builds it's
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* path names inside a static buffer. */
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if( setfname )
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if( (_first == NIL(char) && !fset) || res ) {
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if( _first != NIL(char) ) FREE( _first );
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if (nodup)
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_first = NIL(char);
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else {
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_first = path;
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path = NIL(char);
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}
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fset = 1;
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}
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DB_PRINT( "stat", ("_first [%s], path [%s]", _first, path) );
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if( dir != lp->cl_prq->CE_NAME ) FREE(dir);
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if( path && path != cp->CE_NAME ) FREE(path);
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}
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}
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DB_PRINT( "mem", ("%s:-< mem %ld", cp->CE_NAME, (long) coreleft()) );
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DB_RETURN( res );
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}
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