aminet/util/arc/unzip/globals.c

   1 /*
   2   Copyright (c) 1990-2007 Info-ZIP.  All rights reserved.
   3
   4   See the accompanying file LICENSE, version 2003-May-08 or later
   5   (the contents of which are also included in unzip.h) for terms of use.
   6   If, for some reason, all these files are missing, the Info-ZIP license
   7   also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
   8 */
   9 /*---------------------------------------------------------------------------
  10
  11   globals.c
  12
  13   Routines to allocate and initialize globals, with or without threads.
  14
  15   Contents:  registerGlobalPointer()
  16              deregisterGlobalPointer()
  17              getGlobalPointer()
  18              globalsCtor()
  19
  20   ---------------------------------------------------------------------------*/
  21
  22
  23 #define UNZIP_INTERNAL
  24 #include "unzip.h"
  25
  26 #ifndef FUNZIP
  27 /* initialization of sigs is completed at runtime so unzip(sfx) executable
  28  * won't look like a zipfile
  29  */
  30 char central_hdr_sig[4]   = {0, 0, 0x01, 0x02};
  31 char local_hdr_sig[4]     = {0, 0, 0x03, 0x04};
  32 char end_central_sig[4]   = {0, 0, 0x05, 0x06};
  33 char end_central64_sig[4] = {0, 0, 0x06, 0x06};
  34 char end_centloc64_sig[4] = {0, 0, 0x06, 0x07};
  35 /* extern char extd_local_sig[4] = {0, 0, 0x07, 0x08};  NOT USED YET */
  36
  37 ZCONST char *fnames[2] = {"*", NULL};   /* default filenames vector */
  38 #endif
  39
  40
  41 #ifndef REENTRANT
  42    Uz_Globs G;
  43 #else /* REENTRANT */
  44
  45 #  ifndef USETHREADID
  46      Uz_Globs *GG;
  47 #  else /* USETHREADID */
  48 #    define THREADID_ENTRIES  0x40
  49
  50      int lastScan;
  51      Uz_Globs  *threadPtrTable[THREADID_ENTRIES];
  52      ulg        threadIdTable [THREADID_ENTRIES] = {
  53          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
  54          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,    /* Make sure there are */
  55          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,    /* THREADID_ENTRIES 0s */
  56          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0
  57      };
  58
  59      static ZCONST char Far TooManyThreads[] =
  60        "error:  more than %d simultaneous threads.\n\
  61         Some threads are probably not calling DESTROYTHREAD()\n";
  62      static ZCONST char Far EntryNotFound[] =
  63        "error:  couldn't find global pointer in table.\n\
  64         Maybe somebody accidentally called DESTROYTHREAD() twice.\n";
  65      static ZCONST char Far GlobalPointerMismatch[] =
  66        "error:  global pointer in table does not match pointer passed as\
  67  parameter\n";
  68
  69 static void registerGlobalPointer OF((__GPRO));
  70
  71
  72
  73 static void registerGlobalPointer(__G)
  74     __GDEF
  75 {
  76     int scan=0;
  77     ulg tid = GetThreadId();
  78
  79     while (threadIdTable[scan] && scan < THREADID_ENTRIES)
  80         scan++;
  81
  82     if (scan == THREADID_ENTRIES) {
  83         ZCONST char *tooMany = LoadFarString(TooManyThreads);
  84         Info(slide, 0x421, ((char *)slide, tooMany, THREADID_ENTRIES));
  85         free(pG);
  86         EXIT(PK_MEM);   /* essentially memory error before we've started */
  87     }
  88
  89     threadIdTable [scan] = tid;
  90     threadPtrTable[scan] = pG;
  91     lastScan = scan;
  92 }
  93
  94
  95
  96 void deregisterGlobalPointer(__G)
  97     __GDEF
  98 {
  99     int scan=0;
 100     ulg tid = GetThreadId();
 101
 102
 103     while (threadIdTable[scan] != tid && scan < THREADID_ENTRIES)
 104         scan++;
 105
 106 /*---------------------------------------------------------------------------
 107     There are two things we can do if we can't find the entry:  ignore it or
 108     scream.  The most likely reason for it not to be here is the user calling
 109     this routine twice.  Since this could cause BIG problems if any globals
 110     are accessed after the first call, we'd better scream.
 111   ---------------------------------------------------------------------------*/
 112
 113     if (scan == THREADID_ENTRIES || threadPtrTable[scan] != pG) {
 114         ZCONST char *noEntry;
 115         if (scan == THREADID_ENTRIES)
 116             noEntry = LoadFarString(EntryNotFound);
 117         else
 118             noEntry = LoadFarString(GlobalPointerMismatch);
 119         Info(slide, 0x421, ((char *)slide, noEntry));
 120         EXIT(PK_WARN);   /* programming error, but after we're all done */
 121     }
 122
 123     threadIdTable [scan] = 0;
 124     lastScan = scan;
 125     free(threadPtrTable[scan]);
 126 }
 127
 128
 129
 130 Uz_Globs *getGlobalPointer()
 131 {
 132     int scan=0;
 133     ulg tid = GetThreadId();
 134
 135     while (threadIdTable[scan] != tid && scan < THREADID_ENTRIES)
 136         scan++;
 137
 138 /*---------------------------------------------------------------------------
 139     There are two things we can do if we can't find the entry:  ignore it or
 140     scream.  The most likely reason for it not to be here is the user calling
 141     this routine twice.  Since this could cause BIG problems if any globals
 142     are accessed after the first call, we'd better scream.
 143   ---------------------------------------------------------------------------*/
 144
 145     if (scan == THREADID_ENTRIES) {
 146         ZCONST char *noEntry = LoadFarString(EntryNotFound);
 147         fprintf(stderr, noEntry);  /* can't use Info w/o a global pointer */
 148         EXIT(PK_ERR);   /* programming error while still working */
 149     }
 150
 151     return threadPtrTable[scan];
 152 }
 153
 154 #  endif /* ?USETHREADID */
 155 #endif /* ?REENTRANT */
 156
 157
 158
 159 Uz_Globs *globalsCtor()
 160 {
 161 #ifdef REENTRANT
 162     Uz_Globs *pG = (Uz_Globs *)malloc(sizeof(Uz_Globs));
 163
 164     if (!pG)
 165         return (Uz_Globs *)NULL;
 166 #endif /* REENTRANT */
 167
 168     /* for REENTRANT version, G is defined as (*pG) */
 169
 170     memzero(&G, sizeof(Uz_Globs));
 171
 172 #ifndef FUNZIP
 173 #ifdef CMS_MVS
 174     uO.aflag=1;
 175     uO.C_flag=1;
 176 #endif
 177 #ifdef TANDEM
 178     uO.aflag=1;     /* default to '-a' auto create Text Files as type 101 */
 179 #endif
 180 #ifdef VMS
 181 # if (!defined(NO_TIMESTAMPS))
 182     uO.D_flag=1;    /* default to '-D', no restoration of dir timestamps */
 183 # endif
 184 #endif
 185
 186     uO.lflag=(-1);
 187     G.wildzipfn = "";
 188     G.pfnames = (char **)fnames;
 189     G.pxnames = (char **)&fnames[1];
 190     G.pInfo = G.info;
 191     G.sol = TRUE;          /* at start of line */
 192
 193     G.message = UzpMessagePrnt;
 194     G.input = UzpInput;           /* not used by anyone at the moment... */
 195 #if defined(WINDLL) || defined(MACOS)
 196     G.mpause = NULL;              /* has scrollbars:  no need for pausing */
 197 #else
 198     G.mpause = UzpMorePause;
 199 #endif
 200     G.decr_passwd = UzpPassword;
 201 #endif /* !FUNZIP */
 202
 203 #if (!defined(DOS_FLX_H68_NLM_OS2_W32) && !defined(AMIGA) && !defined(RISCOS))
 204 #if (!defined(MACOS) && !defined(ATARI) && !defined(VMS))
 205     G.echofd = -1;
 206 #endif /* !(MACOS || ATARI || VMS) */
 207 #endif /* !(DOS_FLX_H68_NLM_OS2_W32 || AMIGA || RISCOS) */
 208
 209 #ifdef SYSTEM_SPECIFIC_CTOR
 210     SYSTEM_SPECIFIC_CTOR(__G);
 211 #endif
 212
 213 #ifdef REENTRANT
 214 #ifdef USETHREADID
 215     registerGlobalPointer(__G);
 216 #else
 217     GG = &G;
 218 #endif /* ?USETHREADID */
 219 #endif /* REENTRANT */
 220
 221     return &G;
 222 }