utils/Install/sfxzip/globals.c

   1 /*---------------------------------------------------------------------------
   2
   3   globals.c
   4
   5   Routines to allocate and initialize globals, with or without threads.
   6
   7   Contents:  registerGlobalPointer()
   8              deregisterGlobalPointer()
   9              getGlobalPointer()
  10              globalsCtor()
  11
  12   ---------------------------------------------------------------------------*/
  13
  14
  15 #define UNZIP_INTERNAL
  16 #include "unzip.h"
  17
  18 #ifndef FUNZIP
  19 /* initialization of sigs is completed at runtime so unzip(sfx) executable
  20  * won't look like a zipfile
  21  */
  22 char central_hdr_sig[4] = {0, 0, 0x01, 0x02};
  23 char local_hdr_sig[4]   = {0, 0, 0x03, 0x04};
  24 char end_central_sig[4] = {0, 0, 0x05, 0x06};
  25 /* extern char extd_local_sig[4] = {0, 0, 0x07, 0x08};  NOT USED YET */
  26
  27 ZCONST char *fnames[2] = {"*", NULL};   /* default filenames vector */
  28 #endif
  29
  30
  31 #ifndef REENTRANT
  32    Uz_Globs G;
  33 #else /* REENTRANT */
  34
  35 #  ifndef USETHREADID
  36      Uz_Globs *GG;
  37 #  else /* USETHREADID */
  38 #    define THREADID_ENTRIES  0x40
  39
  40      int lastScan;
  41      Uz_Globs  *threadPtrTable[THREADID_ENTRIES];
  42      ulg        threadIdTable [THREADID_ENTRIES] = {
  43          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
  44          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,    /* Make sure there are */
  45          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,    /* THREADID_ENTRIES 0s */
  46          0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0
  47      };
  48
  49      static ZCONST char Far TooManyThreads[] =
  50        "error:  more than %d simultaneous threads.\n\
  51         Some threads are probably not calling DESTROYTHREAD()\n";
  52      static ZCONST char Far EntryNotFound[] =
  53        "error:  couldn't find global pointer in table.\n\
  54         Maybe somebody accidentally called DESTROYTHREAD() twice.\n";
  55      static ZCONST char Far GlobalPointerMismatch[] =
  56        "error:  global pointer in table does not match pointer passed as\
  57  parameter\n";
  58
  59 static void registerGlobalPointer OF((__GPRO));
  60
  61
  62
  63 static void registerGlobalPointer(__G)
  64     __GDEF
  65 {
  66     int scan=0;
  67     ulg tid = GetThreadId();
  68
  69     while (threadIdTable[scan] && scan < THREADID_ENTRIES)
  70         scan++;
  71
  72     if (scan == THREADID_ENTRIES) {
  73         ZCONST char *tooMany = LoadFarString(TooManyThreads);
  74         Info(slide, 0x421, ((char *)slide, tooMany, THREADID_ENTRIES));
  75         free(pG);
  76         EXIT(PK_MEM);   /* essentially memory error before we've started */
  77     }
  78
  79     threadIdTable [scan] = tid;
  80     threadPtrTable[scan] = pG;
  81     lastScan = scan;
  82 }
  83
  84
  85
  86 void deregisterGlobalPointer(__G)
  87     __GDEF
  88 {
  89     int scan=0;
  90     ulg tid = GetThreadId();
  91
  92
  93     while (threadIdTable[scan] != tid && scan < THREADID_ENTRIES)
  94         scan++;
  95
  96 /*---------------------------------------------------------------------------
  97     There are two things we can do if we can't find the entry:  ignore it or
  98     scream.  The most likely reason for it not to be here is the user calling
  99     this routine twice.  Since this could cause BIG problems if any globals
 100     are accessed after the first call, we'd better scream.
 101   ---------------------------------------------------------------------------*/
 102
 103     if (scan == THREADID_ENTRIES || threadPtrTable[scan] != pG) {
 104         ZCONST char *noEntry;
 105         if (scan == THREADID_ENTRIES)
 106             noEntry = LoadFarString(EntryNotFound);
 107         else
 108             noEntry = LoadFarString(GlobalPointerMismatch);
 109         Info(slide, 0x421, ((char *)slide, noEntry));
 110         EXIT(PK_WARN);   /* programming error, but after we're all done */
 111     }
 112
 113     threadIdTable [scan] = 0;
 114     lastScan = scan;
 115     free(threadPtrTable[scan]);
 116 }
 117
 118
 119
 120 Uz_Globs *getGlobalPointer()
 121 {
 122     int scan=0;
 123     ulg tid = GetThreadId();
 124
 125     while (threadIdTable[scan] != tid && scan < THREADID_ENTRIES)
 126         scan++;
 127
 128 /*---------------------------------------------------------------------------
 129     There are two things we can do if we can't find the entry:  ignore it or
 130     scream.  The most likely reason for it not to be here is the user calling
 131     this routine twice.  Since this could cause BIG problems if any globals
 132     are accessed after the first call, we'd better scream.
 133   ---------------------------------------------------------------------------*/
 134
 135     if (scan == THREADID_ENTRIES) {
 136         ZCONST char *noEntry = LoadFarString(EntryNotFound);
 137         fprintf(stderr, noEntry);  /* can't use Info w/o a global pointer */
 138         EXIT(PK_ERR);   /* programming error while still working */
 139     }
 140
 141     return threadPtrTable[scan];
 142 }
 143
 144 #  endif /* ?USETHREADID */
 145 #endif /* ?REENTRANT */
 146
 147
 148
 149 Uz_Globs *globalsCtor()
 150 {
 151 #ifdef REENTRANT
 152     Uz_Globs *pG = (Uz_Globs *)malloc(sizeof(Uz_Globs));
 153
 154     if (!pG)
 155         return (Uz_Globs *)NULL;
 156 #endif /* REENTRANT */
 157
 158     /* for REENTRANT version, G is defined as (*pG) */
 159
 160     memzero(&G, sizeof(Uz_Globs));
 161
 162 #ifndef FUNZIP
 163 #ifdef CMS_MVS
 164     uO.aflag=1;
 165     uO.C_flag=1;
 166 #endif
 167
 168     uO.lflag=(-1);
 169     G.wildzipfn = "";
 170     G.pfnames = (char **)fnames;
 171     G.pxnames = (char **)&fnames[1];
 172     G.pInfo = G.info;
 173     G.sol = TRUE;          /* at start of line */
 174
 175     G.message = UzpMessagePrnt;
 176     G.input = UzpInput;           /* not used by anyone at the moment... */
 177 #if defined(WINDLL) || defined(MACOS)
 178     G.mpause = NULL;              /* has scrollbars:  no need for pausing */
 179 #else
 180     G.mpause = UzpMorePause;
 181 #endif
 182     G.decr_passwd = UzpPassword;
 183 #endif /* !FUNZIP */
 184
 185 #if (!defined(DOS_FLX_H68_OS2_W32) && !defined(AMIGA) && !defined(RISCOS))
 186 #if (!defined(MACOS) && !defined(ATARI) && !defined(VMS))
 187     G.echofd = -1;
 188 #endif /* !(MACOS || ATARI || VMS) */
 189 #endif /* !(DOS_FLX_H68_OS2_W32 || AMIGA || RISCOS) */
 190
 191 #ifdef SYSTEM_SPECIFIC_CTOR
 192     SYSTEM_SPECIFIC_CTOR(__G);
 193 #endif
 194
 195 #ifdef REENTRANT
 196 #ifdef USETHREADID
 197     registerGlobalPointer(__G);
 198 #else
 199     GG = &G;
 200 #endif /* ?USETHREADID */
 201 #endif /* REENTRANT */
 202
 203     return &G;
 204 }