windows/alias.c

   1 /*
   2  * Function alias support
   3  *
   4  * Copyright 1995 Martin von Loewis
   5  *
   6  */
   7
   8 #include "windows.h"
   9 #include "alias.h"
  10
  11 #include "stddebug.h"
  12 #include "debug.h"
  13
  14 /* some large prime */
  15 #define TABLESIZE       2677
  16
  17 static ALIASHASH AliasTable[TABLESIZE];
  18 /* this could be a bit smaller */
  19 static FUNCTIONALIAS AliasRecord[TABLESIZE];
  20 /* record 0 is always empty */
  21 static int LastRecord;
  22
  23 int ALIAS_UseAliases;
  24
  25 /* closed hashing */
  26 static int ALIAS_LocateHash(DWORD value)
  27 {
  28         int hash,start;
  29         start=hash=value%TABLESIZE;
  30         while(AliasTable[hash].used && AliasTable[hash].used!=value)
  31         {
  32                 hash++;
  33                 if(hash==TABLESIZE)
  34                         hash=0;
  35                 if(hash==start)
  36                 {
  37                         fprintf(stderr,"Hash table full, increase size in alias.c\n");
  38                         exit(0);
  39                 }
  40         }
  41         return hash;
  42 }
  43
  44 void ALIAS_RegisterAlias(DWORD Wine,DWORD Win16, DWORD Win32)
  45 {
  46     int whash = 0, w16hash = 0, w32hash = 0, recno=0;
  47     if (!Wine && !Win16 && !Win32) return;
  48     if (Wine)
  49     {
  50         whash=ALIAS_LocateHash(Wine);
  51         recno=AliasTable[whash].used?AliasTable[whash].used:0;
  52     }
  53     if (Win16)
  54     {
  55         w16hash=ALIAS_LocateHash(Win16);
  56         recno=AliasTable[w16hash].used?AliasTable[w16hash].used:0;
  57     }
  58     if (Win32)
  59     {
  60         w32hash=ALIAS_LocateHash(Win32);
  61         recno=AliasTable[w32hash].used?AliasTable[w32hash].used:0;
  62     }
  63     if (!recno)
  64     {
  65         recno=LastRecord;
  66         LastRecord++;
  67     }
  68     if (Wine)
  69     {
  70         AliasTable[whash].used=Wine;
  71         AliasTable[whash].recno=recno;
  72         AliasRecord[recno].wine=Wine;
  73     }
  74     if (Win16)
  75     {
  76         AliasTable[w16hash].used=Win16;
  77         AliasTable[w16hash].recno=recno;
  78         AliasRecord[recno].win16=Win16;
  79     }
  80     if (Win32)
  81     {
  82         AliasTable[w32hash].used=Win32;
  83         AliasTable[w32hash].recno=recno;
  84         AliasRecord[recno].win32=Win32;
  85     }
  86 }
  87
  88 FUNCTIONALIAS* ALIAS_LookupAlias(DWORD fn)
  89 {
  90         int index;
  91         index=ALIAS_LocateHash(fn);
  92         if(AliasTable[index].used==fn)
  93                 return &AliasRecord[AliasTable[index].recno];
  94         return 0;
  95 }