#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/stat.h"
#include "libc/calls/struct/stat.macros.h"
#include "libc/errno.h"
#include "libc/log/log.h"
#include "libc/mem/gc.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/s.h"
#include "libc/sysv/consts/sig.h"
#include "libc/time/struct/utimbuf.h"
#include "libc/time/time.h"
#include "third_party/bzip2/bzlib.h"
/* clang-format off */

/*-----------------------------------------------------------*/
/*--- A block-sorting, lossless compressor        bzip2.c ---*/
/*-----------------------------------------------------------*/

/* ------------------------------------------------------------------
   This file is part of bzip2/libbzip2, a program and library for
   lossless, block-sorting data compression.

   bzip2/libbzip2 version 1.0.8 of 13 July 2019
   Copyright (C) 1996-2019 Julian Seward <jseward@acm.org>

   Please read the WARNING, DISCLAIMER and PATENTS sections in the 
   README file.

   This program is released under the terms of the license contained
   in the file LICENSE.
   ------------------------------------------------------------------ */

#define BZ_UNIX      1

/*---------------------------------------------*/
/*--
  Some stuff for all platforms.
--*/

#define ERROR_IF_EOF(i)       { if ((i) == EOF)  ioError(); }
#define ERROR_IF_NOT_ZERO(i)  { if ((i) != 0)    ioError(); }
#define ERROR_IF_MINUS_ONE(i) { if ((i) == (-1)) ioError(); }


/*---------------------------------------------*/
/*--
   Platform-specific stuff.
--*/

#if BZ_UNIX
#define PATH_SEP    '/'
#define MY_LSTAT    lstat
#define MY_STAT     stat
#define MY_S_ISREG  S_ISREG
#define MY_S_ISDIR  S_ISDIR
#define APPEND_FILESPEC(root, name) \
      root=snocString((root), (name))
#define APPEND_FLAG(root, name) \
      root=snocString((root), (name))
#define SET_BINARY_MODE(fd) /**/
#endif /* BZ_UNIX */

/*---------------------------------------------*/
/*--
  Some more stuff for all platforms :-)
--*/

typedef char            Char;
typedef unsigned char   Bool;
typedef unsigned char   UChar;
typedef int             Int32;
typedef unsigned int    UInt32;
typedef short           Int16;
typedef unsigned short  UInt16;
                                       
#define True  ((Bool)1)
#define False ((Bool)0)

/*--
  IntNative is your platform's `native' int size.
  Only here to avoid probs with 64-bit platforms.
--*/
typedef int IntNative;


/*---------------------------------------------------*/
/*--- Misc (file handling) data decls             ---*/
/*---------------------------------------------------*/

Int32   verbosity;
Bool    keepInputFiles, smallMode, deleteOutputOnInterrupt;
Bool    forceOverwrite, testFailsExist, unzFailsExist, noisy;
Int32   numFileNames, numFilesProcessed, blockSize100k;
Int32   exitValue;

/*-- source modes; F==file, I==stdin, O==stdout --*/
#define SM_I2O           1
#define SM_F2O           2
#define SM_F2F           3

/*-- operation modes --*/
#define OM_Z             1
#define OM_UNZ           2
#define OM_TEST          3

Int32   opMode;
Int32   srcMode;

#define FILE_NAME_LEN 1034

Int32   longestFileName;
Char    inName [FILE_NAME_LEN];
Char    outName[FILE_NAME_LEN];
Char    tmpName[FILE_NAME_LEN];
Char    *progName;
Char    progNameReally[FILE_NAME_LEN];
FILE    *outputHandleJustInCase;
Int32   workFactor;

static void    panic                 ( const Char* ) wontreturn;
static void    ioError               ( void )        wontreturn;
static void    outOfMemory           ( void )        wontreturn;
static void    configError           ( void )        wontreturn;
static void    crcError              ( void )        wontreturn;
static void    cleanUpAndFail        ( Int32 )       wontreturn;
static void    compressedStreamEOF   ( void )        wontreturn;

static void    copyFileName ( Char*, Char* );
static void*   myMalloc     ( Int32 );
static void    applySavedFileAttrToOutputFile ( IntNative fd );



/*---------------------------------------------------*/
/*--- An implementation of 64-bit ints.  Sigh.    ---*/
/*--- Roll on widespread deployment of ANSI C9X ! ---*/
/*---------------------------------------------------*/

typedef
   struct { UChar b[8]; } 
   UInt64;


static
void uInt64_from_UInt32s ( UInt64* n, UInt32 lo32, UInt32 hi32 )
{
   n->b[7] = (UChar)((hi32 >> 24) & 0xFF);
   n->b[6] = (UChar)((hi32 >> 16) & 0xFF);
   n->b[5] = (UChar)((hi32 >> 8)  & 0xFF);
   n->b[4] = (UChar) (hi32        & 0xFF);
   n->b[3] = (UChar)((lo32 >> 24) & 0xFF);
   n->b[2] = (UChar)((lo32 >> 16) & 0xFF);
   n->b[1] = (UChar)((lo32 >> 8)  & 0xFF);
   n->b[0] = (UChar) (lo32        & 0xFF);
}


static
double uInt64_to_double ( UInt64* n )
{
   Int32  i;
   double base = 1.0;
   double sum  = 0.0;
   for (i = 0; i < 8; i++) {
      sum  += base * (double)(n->b[i]);
      base *= 256.0;
   }
   return sum;
}


static
Bool uInt64_isZero ( UInt64* n )
{
   Int32 i;
   for (i = 0; i < 8; i++)
      if (n->b[i] != 0) return 0;
   return 1;
}


/* Divide *n by 10, and return the remainder.  */
static 
Int32 uInt64_qrm10 ( UInt64* n )
{
   UInt32 rem, tmp;
   Int32  i;
   rem = 0;
   for (i = 7; i >= 0; i--) {
      tmp = rem * 256 + n->b[i];
      n->b[i] = tmp / 10;
      rem = tmp % 10;
   }
   return rem;
}


/* ... and the Whole Entire Point of all this UInt64 stuff is
   so that we can supply the following function.
*/
static
void uInt64_toAscii ( char* outbuf, UInt64* n )
{
   Int32  i, q;
   UChar  buf[32];
   Int32  nBuf   = 0;
   UInt64 n_copy = *n;
   do {
      q = uInt64_qrm10 ( &n_copy );
      buf[nBuf] = q + '0';
      nBuf++;
   } while (!uInt64_isZero(&n_copy));
   outbuf[nBuf] = 0;
   for (i = 0; i < nBuf; i++) 
      outbuf[i] = buf[nBuf-i-1];
}


/*---------------------------------------------------*/
/*--- Processing of complete files and streams    ---*/
/*---------------------------------------------------*/

/*---------------------------------------------*/
static 
Bool myfeof ( FILE* f )
{
   Int32 c = fgetc ( f );
   if (c == EOF) return True;
   ungetc ( c, f );
   return False;
}


/*---------------------------------------------*/
static 
void compressStream ( FILE *stream, FILE *zStream )
{
   BZFILE* bzf = NULL;
   UChar   *ibuf = gc(malloc(5000));
   Int32   nIbuf;
   UInt32  nbytes_in_lo32, nbytes_in_hi32;
   UInt32  nbytes_out_lo32, nbytes_out_hi32;
   Int32   bzerr, bzerr_dummy, ret;

   SET_BINARY_MODE(stream);
   SET_BINARY_MODE(zStream);

   if (ferror(stream)) goto errhandler_io;
   if (ferror(zStream)) goto errhandler_io;

   bzf = BZ2_bzWriteOpen ( &bzerr, zStream, 
                           blockSize100k, verbosity, workFactor );   
   if (bzerr != BZ_OK) goto errhandler;

   if (verbosity >= 2) (fprintf) ( stderr, "\n" );

   while (True) {

      if (myfeof(stream)) break;
      nIbuf = fread ( ibuf, sizeof(UChar), 5000, stream );
      if (ferror(stream)) goto errhandler_io;
      if (nIbuf > 0) BZ2_bzWrite ( &bzerr, bzf, (void*)ibuf, nIbuf );
      if (bzerr != BZ_OK) goto errhandler;

   }

   BZ2_bzWriteClose64 ( &bzerr, bzf, 0, 
                        &nbytes_in_lo32, &nbytes_in_hi32,
                        &nbytes_out_lo32, &nbytes_out_hi32 );
   if (bzerr != BZ_OK) goto errhandler;

   if (ferror(zStream)) goto errhandler_io;
   ret = fflush ( zStream );
   if (ret == EOF) goto errhandler_io;
   if (zStream != stdout) {
      Int32 fd = fileno ( zStream );
      if (fd < 0) goto errhandler_io;
      applySavedFileAttrToOutputFile ( fd );
      ret = fclose ( zStream );
      outputHandleJustInCase = NULL;
      if (ret == EOF) goto errhandler_io;
   }
   outputHandleJustInCase = NULL;
   if (ferror(stream)) goto errhandler_io;
   ret = fclose ( stream );
   if (ret == EOF) goto errhandler_io;

   if (verbosity >= 1) {
      if (nbytes_in_lo32 == 0 && nbytes_in_hi32 == 0) {
	 (fprintf) ( stderr, " no data compressed.\n");
      } else {
	 Char   buf_nin[32], buf_nout[32];
	 UInt64 nbytes_in,   nbytes_out;
	 double nbytes_in_d, nbytes_out_d;
	 uInt64_from_UInt32s ( &nbytes_in, 
			       nbytes_in_lo32, nbytes_in_hi32 );
	 uInt64_from_UInt32s ( &nbytes_out, 
			       nbytes_out_lo32, nbytes_out_hi32 );
	 nbytes_in_d  = uInt64_to_double ( &nbytes_in );
	 nbytes_out_d = uInt64_to_double ( &nbytes_out );
	 uInt64_toAscii ( buf_nin, &nbytes_in );
	 uInt64_toAscii ( buf_nout, &nbytes_out );
	 (fprintf) ( stderr, "%6.3f:1, %6.3f bits/byte, "
		   "%5.2f%% saved, %s in, %s out.\n",
		   nbytes_in_d / nbytes_out_d,
		   (8.0 * nbytes_out_d) / nbytes_in_d,
		   100.0 * (1.0 - nbytes_out_d / nbytes_in_d),
		   buf_nin,
		   buf_nout
		 );
      }
   }

   return;

   errhandler:
   BZ2_bzWriteClose64 ( &bzerr_dummy, bzf, 1, 
                        &nbytes_in_lo32, &nbytes_in_hi32,
                        &nbytes_out_lo32, &nbytes_out_hi32 );
   switch (bzerr) {
      case BZ_CONFIG_ERROR:
         configError(); break;
      case BZ_MEM_ERROR:
         outOfMemory (); break;
      case BZ_IO_ERROR:
         errhandler_io:
         ioError(); break;
      default:
         panic ( "compress:unexpected error" );
   }

   panic ( "compress:end" );
   /*notreached*/
}



/*---------------------------------------------*/
static 
Bool uncompressStream ( FILE *zStream, FILE *stream )
{
   BZFILE* bzf = NULL;
   Int32   bzerr, bzerr_dummy, ret, nread, streamNo, i;
   UChar   *obuf = gc(malloc(5000));
   UChar   *unused = gc(malloc(BZ_MAX_UNUSED));
   Int32   nUnused;
   void*   unusedTmpV;
   UChar*  unusedTmp;

   nUnused = 0;
   streamNo = 0;

   SET_BINARY_MODE(stream);
   SET_BINARY_MODE(zStream);

   if (ferror(stream)) goto errhandler_io;
   if (ferror(zStream)) goto errhandler_io;

   while (True) {

      bzf = BZ2_bzReadOpen ( 
               &bzerr, zStream, verbosity, 
               (int)smallMode, unused, nUnused
            );
      if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
      streamNo++;

      while (bzerr == BZ_OK) {
         nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
         if (bzerr == BZ_DATA_ERROR_MAGIC) goto trycat;
         if ((bzerr == BZ_OK || bzerr == BZ_STREAM_END) && nread > 0)
            fwrite ( obuf, sizeof(UChar), nread, stream );
         if (ferror(stream)) goto errhandler_io;
      }
      if (bzerr != BZ_STREAM_END) goto errhandler;

      BZ2_bzReadGetUnused ( &bzerr, bzf, &unusedTmpV, &nUnused );
      if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );

      unusedTmp = (UChar*)unusedTmpV;
      for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];

      BZ2_bzReadClose ( &bzerr, bzf );
      if (bzerr != BZ_OK) panic ( "decompress:bzReadGetUnused" );

      if (nUnused == 0 && myfeof(zStream)) break;
   }

   closeok:
   if (ferror(zStream)) goto errhandler_io;
   if (stream != stdout) {
      Int32 fd = fileno ( stream );
      if (fd < 0) goto errhandler_io;
      applySavedFileAttrToOutputFile ( fd );
   }
   ret = fclose ( zStream );
   if (ret == EOF) goto errhandler_io;

   if (ferror(stream)) goto errhandler_io;
   ret = fflush ( stream );
   if (ret != 0) goto errhandler_io;
   if (stream != stdout) {
      ret = fclose ( stream );
      outputHandleJustInCase = NULL;
      if (ret == EOF) goto errhandler_io;
   }
   outputHandleJustInCase = NULL;
   if (verbosity >= 2) (fprintf) ( stderr, "\n    " );
   return True;

   trycat: 
   if (forceOverwrite) {
      rewind(zStream);
      while (True) {
      	 if (myfeof(zStream)) break;
      	 nread = fread ( obuf, sizeof(UChar), 5000, zStream );
      	 if (ferror(zStream)) goto errhandler_io;
      	 if (nread > 0) fwrite ( obuf, sizeof(UChar), nread, stream );
      	 if (ferror(stream)) goto errhandler_io;
      }
      goto closeok;
   }
  
   errhandler:
   BZ2_bzReadClose ( &bzerr_dummy, bzf );
   switch (bzerr) {
      case BZ_CONFIG_ERROR:
         configError(); break;
      case BZ_IO_ERROR:
         errhandler_io:
         ioError(); break;
      case BZ_DATA_ERROR:
         crcError();
      case BZ_MEM_ERROR:
         outOfMemory();
      case BZ_UNEXPECTED_EOF:
         compressedStreamEOF();
      case BZ_DATA_ERROR_MAGIC:
         if (zStream != stdin) fclose(zStream);
         if (stream != stdout) fclose(stream);
         if (streamNo == 1) {
            return False;
         } else {
            if (noisy)
            (fprintf) ( stderr, 
                      "\n%s: %s: trailing garbage after EOF ignored\n",
                      progName, inName );
            return True;       
         }
      default:
         panic ( "decompress:unexpected error" );
   }

   panic ( "decompress:end" );
   return True; /*notreached*/
}


/*---------------------------------------------*/
static 
Bool testStream ( FILE *zStream )
{
   BZFILE* bzf = NULL;
   Int32   bzerr, bzerr_dummy, ret, streamNo, i;
   UChar   *obuf = gc(malloc(5000));
   UChar   *unused = gc(malloc(BZ_MAX_UNUSED));
   Int32   nUnused;
   void*   unusedTmpV;
   UChar*  unusedTmp;

   nUnused = 0;
   streamNo = 0;

   SET_BINARY_MODE(zStream);
   if (ferror(zStream)) goto errhandler_io;

   while (True) {

      bzf = BZ2_bzReadOpen ( 
               &bzerr, zStream, verbosity, 
               (int)smallMode, unused, nUnused
            );
      if (bzf == NULL || bzerr != BZ_OK) goto errhandler;
      streamNo++;

      while (bzerr == BZ_OK) {
         BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
         if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
      }
      if (bzerr != BZ_STREAM_END) goto errhandler;

      BZ2_bzReadGetUnused ( &bzerr, bzf, &unusedTmpV, &nUnused );
      if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );

      unusedTmp = (UChar*)unusedTmpV;
      for (i = 0; i < nUnused; i++) unused[i] = unusedTmp[i];

      BZ2_bzReadClose ( &bzerr, bzf );
      if (bzerr != BZ_OK) panic ( "test:bzReadGetUnused" );
      if (nUnused == 0 && myfeof(zStream)) break;

   }

   if (ferror(zStream)) goto errhandler_io;
   ret = fclose ( zStream );
   if (ret == EOF) goto errhandler_io;

   if (verbosity >= 2) (fprintf) ( stderr, "\n    " );
   return True;

   errhandler:
   BZ2_bzReadClose ( &bzerr_dummy, bzf );
   if (verbosity == 0) 
      (fprintf) ( stderr, "%s: %s: ", progName, inName );
   switch (bzerr) {
      case BZ_CONFIG_ERROR:
         configError(); break;
      case BZ_IO_ERROR:
         errhandler_io:
         ioError(); break;
      case BZ_DATA_ERROR:
         (fprintf) ( stderr,
                   "data integrity (CRC) error in data\n" );
         return False;
      case BZ_MEM_ERROR:
         outOfMemory();
      case BZ_UNEXPECTED_EOF:
         (fprintf) ( stderr,
                   "file ends unexpectedly\n" );
         return False;
      case BZ_DATA_ERROR_MAGIC:
         if (zStream != stdin) fclose(zStream);
         if (streamNo == 1) {
          (fprintf) ( stderr, 
                    "bad magic number (file not created by bzip2)\n" );
            return False;
         } else {
            if (noisy)
            (fprintf) ( stderr, 
                      "trailing garbage after EOF ignored\n" );
            return True;       
         }
      default:
         panic ( "test:unexpected error" );
   }

   panic ( "test:end" );
   return True; /*notreached*/
}


/*---------------------------------------------------*/
/*--- Error [non-] handling grunge                ---*/
/*---------------------------------------------------*/

/*---------------------------------------------*/
static
void setExit ( Int32 v )
{
   if (v > exitValue) exitValue = v;
}


/*---------------------------------------------*/
static 
void cadvise ( void )
{
   if (noisy)
   (fprintf) (
      stderr,
      "\nIt is possible that the compressed file(s) have become corrupted.\n"
        "You can use the -tvv option to test integrity of such files.\n\n"
        "You can use the `bzip2recover' program to attempt to recover\n"
        "data from undamaged sections of corrupted files.\n\n"
    );
}


/*---------------------------------------------*/
static 
void showFileNames ( void )
{
   if (noisy)
   (fprintf) (
      stderr,
      "\tInput file = %s, output file = %s\n",
      inName, outName 
   );
}


/*---------------------------------------------*/
static 
void cleanUpAndFail ( Int32 ec )
{
   IntNative      retVal;
   struct MY_STAT statBuf;

   if ( srcMode == SM_F2F 
        && opMode != OM_TEST
        && deleteOutputOnInterrupt ) {

      /* Check whether input file still exists.  Delete output file
         only if input exists to avoid loss of data.  Joerg Prante, 5
         January 2002.  (JRS 06-Jan-2002: other changes in 1.0.2 mean
         this is less likely to happen.  But to be ultra-paranoid, we
         do the check anyway.)  */
      retVal = MY_STAT ( inName, &statBuf );
      if (retVal == 0) {
         if (noisy)
            (fprintf) ( stderr, 
                      "%s: Deleting output file %s, if it exists.\n",
                      progName, outName );
         if (outputHandleJustInCase != NULL)
            fclose ( outputHandleJustInCase );
         retVal = remove ( outName );
         if (retVal != 0)
            (fprintf) ( stderr,
                      "%s: WARNING: deletion of output file "
                      "(apparently) failed.\n",
                      progName );
      } else {
         (fprintf) ( stderr,
                   "%s: WARNING: deletion of output file suppressed\n",
                    progName );
         (fprintf) ( stderr,
                   "%s:    since input file no longer exists.  Output file\n",
                   progName );
         (fprintf) ( stderr,
                   "%s:    `%s' may be incomplete.\n",
                   progName, outName );
         (fprintf) ( stderr, 
                   "%s:    I suggest doing an integrity test (bzip2 -tv)"
                   " of it.\n",
                   progName );
      }
   }

   if (noisy && numFileNames > 0 && numFilesProcessed < numFileNames) {
      (fprintf) ( stderr, 
                "%s: WARNING: some files have not been processed:\n"
                "%s:    %d specified on command line, %d not processed yet.\n\n",
                progName, progName,
                numFileNames, numFileNames - numFilesProcessed );
   }
   setExit(ec);
   exit(exitValue);
}


/*---------------------------------------------*/
static 
void panic ( const Char* s )
{
   (fprintf) ( stderr,
             "\n%s: PANIC -- internal consistency error:\n"
             "\t%s\n"
             "\tThis is a BUG.  Please report it to:\n"
             "\tbzip2-devel@sourceware.org\n",
             progName, s );
   showFileNames();
   cleanUpAndFail( 3 );
}


/*---------------------------------------------*/
static 
void crcError ( void )
{
   (fprintf) ( stderr,
             "\n%s: Data integrity error when decompressing.\n",
             progName );
   showFileNames();
   cadvise();
   cleanUpAndFail( 2 );
}


/*---------------------------------------------*/
static 
void compressedStreamEOF ( void )
{
  if (noisy) {
    (fprintf) ( stderr,
	      "\n%s: Compressed file ends unexpectedly;\n\t"
	      "perhaps it is corrupted?  *Possible* reason follows.\n",
	      progName );
    perror ( progName );
    showFileNames();
    cadvise();
  }
  cleanUpAndFail( 2 );
}


/*---------------------------------------------*/
static 
void ioError ( void )
{
   (fprintf) ( stderr,
             "\n%s: I/O or other error, bailing out.  "
             "Possible reason follows.\n",
             progName );
   perror ( progName );
   showFileNames();
   cleanUpAndFail( 1 );
}


/*---------------------------------------------*/
static 
void mySignalCatcher ( IntNative n )
{
   (fprintf) ( stderr,
             "\n%s: Control-C or similar caught, quitting.\n",
             progName );
   cleanUpAndFail(1);
}


/*---------------------------------------------*/
static 
void mySIGSEGVorSIGBUScatcher ( IntNative n )
{
   if (opMode == OM_Z)
      (fprintf) ( 
      stderr,
      "\n%s: Caught a SIGSEGV or SIGBUS whilst compressing.\n"
      "\n"
      "   Possible causes are (most likely first):\n"
      "   (1) This computer has unreliable memory or cache hardware\n"
      "       (a surprisingly common problem; try a different machine.)\n"
      "   (2) A bug in the compiler used to create this executable\n"
      "       (unlikely, if you didn't compile bzip2 yourself.)\n"
      "   (3) A real bug in bzip2 -- I hope this should never be the case.\n"
      "   The user's manual, Section 4.3, has more info on (1) and (2).\n"
      "   \n"
      "   If you suspect this is a bug in bzip2, or are unsure about (1)\n"
      "   or (2), feel free to report it to: bzip2-devel@sourceware.org.\n"
      "   Section 4.3 of the user's manual describes the info a useful\n"
      "   bug report should have.  If the manual is available on your\n"
      "   system, please try and read it before mailing me.  If you don't\n"
      "   have the manual or can't be bothered to read it, mail me anyway.\n"
      "\n",
      progName );
      else
      (fprintf) ( 
      stderr,
      "\n%s: Caught a SIGSEGV or SIGBUS whilst decompressing.\n"
      "\n"
      "   Possible causes are (most likely first):\n"
      "   (1) The compressed data is corrupted, and bzip2's usual checks\n"
      "       failed to detect this.  Try bzip2 -tvv my_file.bz2.\n"
      "   (2) This computer has unreliable memory or cache hardware\n"
      "       (a surprisingly common problem; try a different machine.)\n"
      "   (3) A bug in the compiler used to create this executable\n"
      "       (unlikely, if you didn't compile bzip2 yourself.)\n"
      "   (4) A real bug in bzip2 -- I hope this should never be the case.\n"
      "   The user's manual, Section 4.3, has more info on (2) and (3).\n"
      "   \n"
      "   If you suspect this is a bug in bzip2, or are unsure about (2)\n"
      "   or (3), feel free to report it to: bzip2-devel@sourceware.org.\n"
      "   Section 4.3 of the user's manual describes the info a useful\n"
      "   bug report should have.  If the manual is available on your\n"
      "   system, please try and read it before mailing me.  If you don't\n"
      "   have the manual or can't be bothered to read it, mail me anyway.\n"
      "\n",
      progName );

   showFileNames();
   if (opMode == OM_Z)
      cleanUpAndFail( 3 ); else
      { cadvise(); cleanUpAndFail( 2 ); }
}


/*---------------------------------------------*/
static 
void outOfMemory ( void )
{
   (fprintf) ( stderr,
             "\n%s: couldn't allocate enough memory\n",
             progName );
   showFileNames();
   cleanUpAndFail(1);
}


/*---------------------------------------------*/
static 
void configError ( void )
{
   (fprintf) ( stderr,
             "bzip2: I'm not configured correctly for this platform!\n"
             "\tI require Int32, Int16 and Char to have sizes\n"
             "\tof 4, 2 and 1 bytes to run properly, and they don't.\n"
             "\tProbably you can fix this by defining them correctly,\n"
             "\tand recompiling.  Bye!\n" );
   setExit(3);
   exit(exitValue);
}


/*---------------------------------------------------*/
/*--- The main driver machinery                   ---*/
/*---------------------------------------------------*/

/* All rather crufty.  The main problem is that input files
   are stat()d multiple times before use.  This should be
   cleaned up. 
*/

/*---------------------------------------------*/
static 
void pad ( Char *s )
{
   Int32 i;
   if ( (Int32)strlen(s) >= longestFileName ) return;
   for (i = 1; i <= longestFileName - (Int32)strlen(s); i++)
      (fprintf) ( stderr, " " );
}


/*---------------------------------------------*/
static 
void copyFileName ( Char* to, Char* from ) 
{
   if ( strlen(from) > FILE_NAME_LEN-10 )  {
      (fprintf) (
         stderr,
         "bzip2: file name\n`%s'\n"
         "is suspiciously (more than %d chars) long.\n"
         "Try using a reasonable file name instead.  Sorry! :-)\n",
         from, FILE_NAME_LEN-10
      );
      setExit(1);
      exit(exitValue);
   }

  strncpy(to,from,FILE_NAME_LEN-10);
  to[FILE_NAME_LEN-10]='\0';
}


/*---------------------------------------------*/
static 
Bool fileExists ( Char* name )
{
   FILE *tmp   = fopen ( name, "rb" );
   Bool exists = (tmp != NULL);
   if (tmp != NULL) fclose ( tmp );
   return exists;
}


/*---------------------------------------------*/
/* Open an output file safely with O_EXCL and good permissions.
   This avoids a race condition in versions < 1.0.2, in which
   the file was first opened and then had its interim permissions
   set safely.  We instead use open() to create the file with
   the interim permissions required. (--- --- rw-).

   For non-Unix platforms, if we are not worrying about
   security issues, simple this simply behaves like fopen.
*/
static
FILE* fopen_output_safely ( Char* name, const char* mode )
{
#  if BZ_UNIX
   FILE*     fp;
   IntNative fh;
   fh = open(name, O_WRONLY|O_CREAT|O_EXCL, S_IWUSR|S_IRUSR);
   if (fh == -1) return NULL;
   fp = fdopen(fh, mode);
   if (fp == NULL) close(fh);
   return fp;
#  else
   return fopen(name, mode);
#  endif
}


/*---------------------------------------------*/
/*--
  if in doubt, return True
--*/
static 
Bool notAStandardFile ( Char* name )
{
   IntNative      i;
   struct MY_STAT statBuf;

   i = MY_LSTAT ( name, &statBuf );
   if (i != 0) return True;
   if (MY_S_ISREG(statBuf.st_mode)) return False;
   return True;
}


/*---------------------------------------------*/
/*--
  rac 11/21/98 see if file has hard links to it
--*/
static 
Int32 countHardLinks ( Char* name )
{  
   IntNative      i;
   struct MY_STAT statBuf;

   i = MY_LSTAT ( name, &statBuf );
   if (i != 0) return 0;
   return (statBuf.st_nlink - 1);
}


/*---------------------------------------------*/
/* Copy modification date, access date, permissions and owner from the
   source to destination file.  We have to copy this meta-info off
   into fileMetaInfo before starting to compress / decompress it,
   because doing it afterwards means we get the wrong access time.

   To complicate matters, in compress() and decompress() below, the
   sequence of tests preceding the call to saveInputFileMetaInfo()
   involves calling fileExists(), which in turn establishes its result
   by attempting to fopen() the file, and if successful, immediately
   fclose()ing it again.  So we have to assume that the fopen() call
   does not cause the access time field to be updated.

   Reading of the man page for stat() (man 2 stat) on RedHat 7.2 seems
   to imply that merely doing open() will not affect the access time.
   Therefore we merely need to hope that the C library only does
   open() as a result of fopen(), and not any kind of read()-ahead
   cleverness.

   It sounds pretty fragile to me.  Whether this carries across
   robustly to arbitrary Unix-like platforms (or even works robustly
   on this one, RedHat 7.2) is unknown to me.  Nevertheless ...  
*/
#if BZ_UNIX
static 
struct MY_STAT fileMetaInfo;
#endif

static 
void saveInputFileMetaInfo ( Char *srcName )
{
#  if BZ_UNIX
   IntNative retVal;
   /* Note use of stat here, not lstat. */
   retVal = MY_STAT( srcName, &fileMetaInfo );
   ERROR_IF_NOT_ZERO ( retVal );
#  endif
}


static 
void applySavedTimeInfoToOutputFile ( Char *dstName )
{
#  if BZ_UNIX
   IntNative      retVal;
   struct utimbuf uTimBuf;

   uTimBuf.actime = fileMetaInfo.st_atime;
   uTimBuf.modtime = fileMetaInfo.st_mtime;

   retVal = utime ( dstName, &uTimBuf );
   ERROR_IF_NOT_ZERO ( retVal );
#  endif
}

static 
void applySavedFileAttrToOutputFile ( IntNative fd )
{
#  if BZ_UNIX
   IntNative retVal;

   retVal = fchmod ( fd, fileMetaInfo.st_mode );
   ERROR_IF_NOT_ZERO ( retVal );

   (void) fchown ( fd, fileMetaInfo.st_uid, fileMetaInfo.st_gid );
   /* chown() will in many cases return with EPERM, which can
      be safely ignored.
   */
#  endif
}


/*---------------------------------------------*/
static 
Bool containsDubiousChars ( Char* name )
{
#  if BZ_UNIX
   /* On unix, files can contain any characters and the file expansion
    * is performed by the shell.
    */
   return False;
#  else /* ! BZ_UNIX */
   /* On non-unix (Win* platforms), wildcard characters are not allowed in 
    * filenames.
    */
   for (; *name != '\0'; name++)
      if (*name == '?' || *name == '*') return True;
   return False;
#  endif /* BZ_UNIX */
}


/*---------------------------------------------*/
#define BZ_N_SUFFIX_PAIRS 4

const Char* zSuffix[BZ_N_SUFFIX_PAIRS] 
   = { ".bz2", ".bz", ".tbz2", ".tbz" };
const Char* unzSuffix[BZ_N_SUFFIX_PAIRS] 
   = { "", "", ".tar", ".tar" };

static 
Bool hasSuffix ( Char* s, const Char* suffix )
{
   Int32 ns = strlen(s);
   Int32 nx = strlen(suffix);
   if (ns < nx) return False;
   if (strcmp(s + ns - nx, suffix) == 0) return True;
   return False;
}

static 
Bool mapSuffix ( Char* name, 
                 const Char* oldSuffix, 
                 const Char* newSuffix )
{
   if (!hasSuffix(name,oldSuffix)) return False;
   name[strlen(name)-strlen(oldSuffix)] = 0;
   strcat ( name, newSuffix );
   return True;
}


/*---------------------------------------------*/
static 
void compress ( Char *name )
{
   FILE  *inStr;
   FILE  *outStr;
   Int32 n, i;
   struct MY_STAT statBuf;

   deleteOutputOnInterrupt = False;

   if (name == NULL && srcMode != SM_I2O)
      panic ( "compress: bad modes\n" );

   switch (srcMode) {
      case SM_I2O: 
         copyFileName ( inName, (Char*)"(stdin)" );
         copyFileName ( outName, (Char*)"(stdout)" ); 
         break;
      case SM_F2F: 
         copyFileName ( inName, name );
         copyFileName ( outName, name );
         strcat ( outName, ".bz2" ); 
         break;
      case SM_F2O: 
         copyFileName ( inName, name );
         copyFileName ( outName, (Char*)"(stdout)" ); 
         break;
   }

   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
      if (noisy)
      (fprintf) ( stderr, "%s: There are no files matching `%s'.\n",
                progName, inName );
      setExit(1);
      return;
   }
   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
      (fprintf) ( stderr, "%s: Can't open input file %s: %s.\n",
                progName, inName, strerror(errno) );
      setExit(1);
      return;
   }
   for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++) {
      if (hasSuffix(inName, zSuffix[i])) {
         if (noisy)
         (fprintf) ( stderr, 
                   "%s: Input file %s already has %s suffix.\n",
                   progName, inName, zSuffix[i] );
         setExit(1);
         return;
      }
   }
   if ( srcMode == SM_F2F || srcMode == SM_F2O ) {
      MY_STAT(inName, &statBuf);
      if ( MY_S_ISDIR(statBuf.st_mode) ) {
         (fprintf)( stderr,
                  "%s: Input file %s is a directory.\n",
                  progName,inName);
         setExit(1);
         return;
      }
   }
   if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
      if (noisy)
      (fprintf) ( stderr, "%s: Input file %s is not a normal file.\n",
                progName, inName );
      setExit(1);
      return;
   }
   if ( srcMode == SM_F2F && fileExists ( outName ) ) {
      if (forceOverwrite) {
	 remove(outName);
      } else {
	 (fprintf) ( stderr, "%s: Output file %s already exists.\n",
		   progName, outName );
	 setExit(1);
	 return;
      }
   }
   if ( srcMode == SM_F2F && !forceOverwrite &&
        (n=countHardLinks ( inName )) > 0) {
      (fprintf) ( stderr, "%s: Input file %s has %d other link%s.\n",
                progName, inName, n, n > 1 ? "s" : "" );
      setExit(1);
      return;
   }

   if ( srcMode == SM_F2F ) {
      /* Save the file's meta-info before we open it.  Doing it later
         means we mess up the access times. */
      saveInputFileMetaInfo ( inName );
   }

   switch ( srcMode ) {

      case SM_I2O:
         inStr = stdin;
         outStr = stdout;
         if ( isatty ( fileno ( stdout ) ) ) {
            (fprintf) ( stderr,
                      "%s: I won't write compressed data to a terminal.\n",
                      progName );
            (fprintf) ( stderr, "%s: For help, type: `%s --help'.\n",
                              progName, progName );
            setExit(1);
            return;
         };
         break;

      case SM_F2O:
         inStr = fopen ( inName, "rb" );
         outStr = stdout;
         if ( isatty ( fileno ( stdout ) ) ) {
            (fprintf) ( stderr,
                      "%s: I won't write compressed data to a terminal.\n",
                      progName );
            (fprintf) ( stderr, "%s: For help, type: `%s --help'.\n",
                              progName, progName );
            if ( inStr != NULL ) fclose ( inStr );
            setExit(1);
            return;
         };
         if ( inStr == NULL ) {
            (fprintf) ( stderr, "%s: Can't open input file %s: %s.\n",
                      progName, inName, strerror(errno) );
            setExit(1);
            return;
         };
         break;

      case SM_F2F:
         inStr = fopen ( inName, "rb" );
         outStr = fopen_output_safely ( outName, "wb" );
         if ( outStr == NULL) {
            (fprintf) ( stderr, "%s: Can't create output file %s: %s.\n",
                      progName, outName, strerror(errno) );
            if ( inStr != NULL ) fclose ( inStr );
            setExit(1);
            return;
         }
         if ( inStr == NULL ) {
            (fprintf) ( stderr, "%s: Can't open input file %s: %s.\n",
                      progName, inName, strerror(errno) );
            if ( outStr != NULL ) fclose ( outStr );
            setExit(1);
            return;
         };
         break;

      default:
         panic ( "compress: bad srcMode" );
         break;
   }

   if (verbosity >= 1) {
      (fprintf) ( stderr,  "  %s: ", inName );
      pad ( inName );
      fflush ( stderr );
   }

   /*--- Now the input and output handles are sane.  Do the Biz. ---*/
   outputHandleJustInCase = outStr;
   deleteOutputOnInterrupt = True;
   compressStream ( inStr, outStr );
   outputHandleJustInCase = NULL;

   /*--- If there was an I/O error, we won't get here. ---*/
   if ( srcMode == SM_F2F ) {
      applySavedTimeInfoToOutputFile ( outName );
      deleteOutputOnInterrupt = False;
      if ( !keepInputFiles ) {
         IntNative retVal = remove ( inName );
         ERROR_IF_NOT_ZERO ( retVal );
      }
   }

   deleteOutputOnInterrupt = False;
}


/*---------------------------------------------*/
static 
void uncompress ( Char *name )
{
   FILE  *inStr;
   FILE  *outStr;
   Int32 n, i;
   Bool  magicNumberOK;
   Bool  cantGuess;
   struct MY_STAT statBuf;

   deleteOutputOnInterrupt = False;

   if (name == NULL && srcMode != SM_I2O)
      panic ( "uncompress: bad modes\n" );

   cantGuess = False;
   switch (srcMode) {
      case SM_I2O: 
         copyFileName ( inName, (Char*)"(stdin)" );
         copyFileName ( outName, (Char*)"(stdout)" ); 
         break;
      case SM_F2F: 
         copyFileName ( inName, name );
         copyFileName ( outName, name );
         for (i = 0; i < BZ_N_SUFFIX_PAIRS; i++)
            if (mapSuffix(outName,zSuffix[i],unzSuffix[i]))
               goto zzz; 
         cantGuess = True;
         strcat ( outName, ".out" );
         break;
      case SM_F2O: 
         copyFileName ( inName, name );
         copyFileName ( outName, (Char*)"(stdout)" ); 
         break;
   }

   zzz:
   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
      if (noisy)
      (fprintf) ( stderr, "%s: There are no files matching `%s'.\n",
                progName, inName );
      setExit(1);
      return;
   }
   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
      (fprintf) ( stderr, "%s: Can't open input file %s: %s.\n",
                progName, inName, strerror(errno) );
      setExit(1);
      return;
   }
   if ( srcMode == SM_F2F || srcMode == SM_F2O ) {
      MY_STAT(inName, &statBuf);
      if ( MY_S_ISDIR(statBuf.st_mode) ) {
         (fprintf)( stderr,
                  "%s: Input file %s is a directory.\n",
                  progName,inName);
         setExit(1);
         return;
      }
   }
   if ( srcMode == SM_F2F && !forceOverwrite && notAStandardFile ( inName )) {
      if (noisy)
      (fprintf) ( stderr, "%s: Input file %s is not a normal file.\n",
                progName, inName );
      setExit(1);
      return;
   }
   if ( /* srcMode == SM_F2F implied && */ cantGuess ) {
      if (noisy)
      (fprintf) ( stderr, 
                "%s: Can't guess original name for %s -- using %s\n",
                progName, inName, outName );
      /* just a warning, no return */
   }   
   if ( srcMode == SM_F2F && fileExists ( outName ) ) {
      if (forceOverwrite) {
	remove(outName);
      } else {
        (fprintf) ( stderr, "%s: Output file %s already exists.\n",
                  progName, outName );
        setExit(1);
        return;
      }
   }
   if ( srcMode == SM_F2F && !forceOverwrite &&
        (n=countHardLinks ( inName ) ) > 0) {
      (fprintf) ( stderr, "%s: Input file %s has %d other link%s.\n",
                progName, inName, n, n > 1 ? "s" : "" );
      setExit(1);
      return;
   }

   if ( srcMode == SM_F2F ) {
      /* Save the file's meta-info before we open it.  Doing it later
         means we mess up the access times. */
      saveInputFileMetaInfo ( inName );
   }

   switch ( srcMode ) {

      case SM_I2O:
         inStr = stdin;
         outStr = stdout;
         if ( isatty ( fileno ( stdin ) ) ) {
            (fprintf) ( stderr,
                      "%s: I won't read compressed data from a terminal.\n",
                      progName );
            (fprintf) ( stderr, "%s: For help, type: `%s --help'.\n",
                              progName, progName );
            setExit(1);
            return;
         };
         break;

      case SM_F2O:
         inStr = fopen ( inName, "rb" );
         outStr = stdout;
         if ( inStr == NULL ) {
            (fprintf) ( stderr, "%s: Can't open input file %s:%s.\n",
                      progName, inName, strerror(errno) );
            if ( inStr != NULL ) fclose ( inStr );
            setExit(1);
            return;
         };
         break;

      case SM_F2F:
         inStr = fopen ( inName, "rb" );
         outStr = fopen_output_safely ( outName, "wb" );
         if ( outStr == NULL) {
            (fprintf) ( stderr, "%s: Can't create output file %s: %s.\n",
                      progName, outName, strerror(errno) );
            if ( inStr != NULL ) fclose ( inStr );
            setExit(1);
            return;
         }
         if ( inStr == NULL ) {
            (fprintf) ( stderr, "%s: Can't open input file %s: %s.\n",
                      progName, inName, strerror(errno) );
            if ( outStr != NULL ) fclose ( outStr );
            setExit(1);
            return;
         };
         break;

      default:
         panic ( "uncompress: bad srcMode" );
         break;
   }

   if (verbosity >= 1) {
      (fprintf) ( stderr, "  %s: ", inName );
      pad ( inName );
      fflush ( stderr );
   }

   /*--- Now the input and output handles are sane.  Do the Biz. ---*/
   outputHandleJustInCase = outStr;
   deleteOutputOnInterrupt = True;
   magicNumberOK = uncompressStream ( inStr, outStr );
   outputHandleJustInCase = NULL;

   /*--- If there was an I/O error, we won't get here. ---*/
   if ( magicNumberOK ) {
      if ( srcMode == SM_F2F ) {
         applySavedTimeInfoToOutputFile ( outName );
         deleteOutputOnInterrupt = False;
         if ( !keepInputFiles ) {
            IntNative retVal = remove ( inName );
            ERROR_IF_NOT_ZERO ( retVal );
         }
      }
   } else {
      unzFailsExist = True;
      deleteOutputOnInterrupt = False;
      if ( srcMode == SM_F2F ) {
         IntNative retVal = remove ( outName );
         ERROR_IF_NOT_ZERO ( retVal );
      }
   }
   deleteOutputOnInterrupt = False;

   if ( magicNumberOK ) {
      if (verbosity >= 1)
         (fprintf) ( stderr, "done\n" );
   } else {
      setExit(2);
      if (verbosity >= 1)
         (fprintf) ( stderr, "not a bzip2 file.\n" ); else
         (fprintf) ( stderr,
                   "%s: %s is not a bzip2 file.\n",
                   progName, inName );
   }

}


/*---------------------------------------------*/
static 
void testf ( Char *name )
{
   FILE *inStr;
   Bool allOK;
   struct MY_STAT statBuf;

   deleteOutputOnInterrupt = False;

   if (name == NULL && srcMode != SM_I2O)
      panic ( "testf: bad modes\n" );

   copyFileName ( outName, (Char*)"(none)" );
   switch (srcMode) {
      case SM_I2O: copyFileName ( inName, (Char*)"(stdin)" ); break;
      case SM_F2F: copyFileName ( inName, name ); break;
      case SM_F2O: copyFileName ( inName, name ); break;
   }

   if ( srcMode != SM_I2O && containsDubiousChars ( inName ) ) {
      if (noisy)
      (fprintf) ( stderr, "%s: There are no files matching `%s'.\n",
                progName, inName );
      setExit(1);
      return;
   }
   if ( srcMode != SM_I2O && !fileExists ( inName ) ) {
      (fprintf) ( stderr, "%s: Can't open input %s: %s.\n",
                progName, inName, strerror(errno) );
      setExit(1);
      return;
   }
   if ( srcMode != SM_I2O ) {
      MY_STAT(inName, &statBuf);
      if ( MY_S_ISDIR(statBuf.st_mode) ) {
         (fprintf)( stderr,
                  "%s: Input file %s is a directory.\n",
                  progName,inName);
         setExit(1);
         return;
      }
   }

   switch ( srcMode ) {

      case SM_I2O:
         if ( isatty ( fileno ( stdin ) ) ) {
            (fprintf) ( stderr,
                      "%s: I won't read compressed data from a terminal.\n",
                      progName );
            (fprintf) ( stderr, "%s: For help, type: `%s --help'.\n",
                              progName, progName );
            setExit(1);
            return;
         };
         inStr = stdin;
         break;

      case SM_F2O: case SM_F2F:
         inStr = fopen ( inName, "rb" );
         if ( inStr == NULL ) {
            (fprintf) ( stderr, "%s: Can't open input file %s:%s.\n",
                      progName, inName, strerror(errno) );
            setExit(1);
            return;
         };
         break;

      default:
         panic ( "testf: bad srcMode" );
         break;
   }

   if (verbosity >= 1) {
      (fprintf) ( stderr, "  %s: ", inName );
      pad ( inName );
      fflush ( stderr );
   }

   /*--- Now the input handle is sane.  Do the Biz. ---*/
   outputHandleJustInCase = NULL;
   allOK = testStream ( inStr );

   if (allOK && verbosity >= 1) (fprintf) ( stderr, "ok\n" );
   if (!allOK) testFailsExist = True;
}


/*---------------------------------------------*/
static 
void license ( void )
{
   (fprintf) ( stderr,

    "bzip2, a block-sorting file compressor.  "
    "Version %s.\n"
    "   \n"
    "   Copyright (C) 1996-2019 by Julian Seward.\n"
    "   \n"
    "   This program is free software; you can redistribute it and/or modify\n"
    "   it under the terms set out in the LICENSE file, which is included\n"
    "   in the bzip2 source distribution.\n"
    "   \n"
    "   This program is distributed in the hope that it will be useful,\n"
    "   but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n"
    "   LICENSE file for more details.\n"
    "   \n",
    BZ2_bzlibVersion()
   );
}


/*---------------------------------------------*/
static 
void usage ( Char *fullProgName )
{
   (fprintf) (
      stderr,
      "bzip2, a block-sorting file compressor.  "
      "Version %s.\n"
      "\n   usage: %s [flags and input files in any order]\n"
      "\n"
      "   -h --help           print this message\n"
      "   -d --decompress     force decompression\n"
      "   -z --compress       force compression\n"
      "   -k --keep           keep (don't delete) input files\n"
      "   -f --force          overwrite existing output files\n"
      "   -t --test           test compressed file integrity\n"
      "   -c --stdout         output to standard out\n"
      "   -q --quiet          suppress noncritical error messages\n"
      "   -v --verbose        be verbose (a 2nd -v gives more)\n"
      "   -L --license        display software version & license\n"
      "   -V --version        display software version & license\n"
      "   -s --small          use less memory (at most 2500k)\n"
      "   -1 .. -9            set block size to 100k .. 900k\n"
      "   --fast              alias for -1\n"
      "   --best              alias for -9\n"
      "\n"
      "   If invoked as `bzip2', default action is to compress.\n"
      "              as `bunzip2',  default action is to decompress.\n"
      "              as `bzcat', default action is to decompress to stdout.\n"
      "\n"
      "   If no file names are given, bzip2 compresses or decompresses\n"
      "   from standard input to standard output.  You can combine\n"
      "   short flags, so `-v -4' means the same as -v4 or -4v, &c.\n"
#     if BZ_UNIX
      "\n"
#     endif
      ,

      BZ2_bzlibVersion(),
      fullProgName
   );
}


/*---------------------------------------------*/
static 
void redundant ( Char* flag )
{
   (fprintf) ( 
      stderr, 
      "%s: %s is redundant in versions 0.9.5 and above\n",
      progName, flag );
}


/*---------------------------------------------*/
/*--
  All the garbage from here to main() is purely to
  implement a linked list of command-line arguments,
  into which main() copies argv[1 .. argc-1].

  The purpose of this exercise is to facilitate 
  the expansion of wildcard characters * and ? in 
  filenames for OSs which don't know how to do it
  themselves, like MSDOS, Windows 95 and NT.

  The actual Dirty Work is done by the platform-
  specific macro APPEND_FILESPEC.
--*/

typedef
   struct zzzz {
      Char        *name;
      struct zzzz *link;
   }
   Cell;


/*---------------------------------------------*/
static 
void *myMalloc ( Int32 n )
{
   void* p;

   p = malloc ( (size_t)n );
   if (p == NULL) outOfMemory ();
   return p;
}


/*---------------------------------------------*/
static 
Cell *mkCell ( void )
{
   Cell *c;

   c = (Cell*) myMalloc ( sizeof ( Cell ) );
   c->name = NULL;
   c->link = NULL;
   return c;
}


/*---------------------------------------------*/
static 
Cell *snocString ( Cell *root, Char *name )
{
   if (root == NULL) {
      Cell *tmp = mkCell();
      tmp->name = (Char*) myMalloc ( 5 + strlen(name) );
      strcpy ( tmp->name, name );
      return tmp;
   } else {
      Cell *tmp = root;
      while (tmp->link != NULL) tmp = tmp->link;
      tmp->link = snocString ( tmp->link, name );
      return root;
   }
}


/*---------------------------------------------*/
static 
void addFlagsFromEnvVar ( Cell** argList, Char* varName ) 
{
   Int32 i, j, k;
   Char *envbase, *p;

   envbase = getenv(varName);
   if (envbase != NULL) {
      p = envbase;
      i = 0;
      while (True) {
         if (p[i] == 0) break;
         p += i;
         i = 0;
         while (isspace((Int32)(p[0]))) p++;
         while (p[i] != 0 && !isspace((Int32)(p[i]))) i++;
         if (i > 0) {
            k = i; if (k > FILE_NAME_LEN-10) k = FILE_NAME_LEN-10;
            for (j = 0; j < k; j++) tmpName[j] = p[j];
            tmpName[k] = 0;
            APPEND_FLAG(*argList, tmpName);
         }
      }
   }
}


/*---------------------------------------------*/
#define ISFLAG(s) (strcmp(aa->name, (s))==0)

IntNative main ( IntNative argc, Char *argv[] )
{
   Int32  i, j;
   Char   *tmp;
   Cell   *argList;
   Cell   *aa;
   Bool   decode;

   /*-- Be really really really paranoid :-) --*/
   if (sizeof(Int32) != 4 || sizeof(UInt32) != 4  ||
       sizeof(Int16) != 2 || sizeof(UInt16) != 2  ||
       sizeof(Char)  != 1 || sizeof(UChar)  != 1)
      configError();

   /*-- Initialise --*/
   outputHandleJustInCase  = NULL;
   smallMode               = False;
   keepInputFiles          = False;
   forceOverwrite          = False;
   noisy                   = True;
   verbosity               = 0;
   blockSize100k           = 9;
   testFailsExist          = False;
   unzFailsExist           = False;
   numFileNames            = 0;
   numFilesProcessed       = 0;
   workFactor              = 30;
   deleteOutputOnInterrupt = False;
   exitValue               = 0;
   i = j = 0; /* avoid bogus warning from egcs-1.1.X */

   /*-- Set up signal handlers for mem access errors --*/
   signal (SIGSEGV, mySIGSEGVorSIGBUScatcher);
#  if BZ_UNIX
#  ifndef __DJGPP__
   signal (SIGBUS,  mySIGSEGVorSIGBUScatcher);
#  endif
#  endif

   copyFileName ( inName,  (Char*)"(none)" );
   copyFileName ( outName, (Char*)"(none)" );

   copyFileName ( progNameReally, argv[0] );
   progName = &progNameReally[0];
   for (tmp = &progNameReally[0]; *tmp != '\0'; tmp++)
      if (*tmp == PATH_SEP) progName = tmp + 1;


   /*-- Copy flags from env var BZIP2, and 
        expand filename wildcards in arg list.
   --*/
   argList = NULL;
   addFlagsFromEnvVar ( &argList,  (Char*)"BZIP2" );
   addFlagsFromEnvVar ( &argList,  (Char*)"BZIP" );
   for (i = 1; i <= argc-1; i++)
      APPEND_FILESPEC(argList, argv[i]);


   /*-- Find the length of the longest filename --*/
   longestFileName = 7;
   numFileNames    = 0;
   decode          = True;
   for (aa = argList; aa != NULL; aa = aa->link) {
      if (ISFLAG("--")) { decode = False; continue; }
      if (aa->name[0] == '-' && decode) continue;
      numFileNames++;
      if (longestFileName < (Int32)strlen(aa->name) )
         longestFileName = (Int32)strlen(aa->name);
   }


   /*-- Determine source modes; flag handling may change this too. --*/
   if (numFileNames == 0)
      srcMode = SM_I2O; else srcMode = SM_F2F;


   /*-- Determine what to do (compress/uncompress/test/cat). --*/
   /*-- Note that subsequent flag handling may change this. --*/
   opMode = OM_Z;

   if ( (strstr ( progName, "unzip" ) != 0) ||
        (strstr ( progName, "UNZIP" ) != 0) )
      opMode = OM_UNZ;

   if ( (strstr ( progName, "z2cat" ) != 0) ||
        (strstr ( progName, "Z2CAT" ) != 0) ||
        (strstr ( progName, "zcat" ) != 0)  ||
        (strstr ( progName, "ZCAT" ) != 0) )  {
      opMode = OM_UNZ;
      srcMode = (numFileNames == 0) ? SM_I2O : SM_F2O;
   }


   /*-- Look at the flags. --*/
   for (aa = argList; aa != NULL; aa = aa->link) {
      if (ISFLAG("--")) break;
      if (aa->name[0] == '-' && aa->name[1] != '-') {
         for (j = 1; aa->name[j] != '\0'; j++) {
            switch (aa->name[j]) {
               case 'c': srcMode          = SM_F2O; break;
               case 'd': opMode           = OM_UNZ; break;
               case 'z': opMode           = OM_Z; break;
               case 'f': forceOverwrite   = True; break;
               case 't': opMode           = OM_TEST; break;
               case 'k': keepInputFiles   = True; break;
               case 's': smallMode        = True; break;
               case 'q': noisy            = False; break;
               case '1': blockSize100k    = 1; break;
               case '2': blockSize100k    = 2; break;
               case '3': blockSize100k    = 3; break;
               case '4': blockSize100k    = 4; break;
               case '5': blockSize100k    = 5; break;
               case '6': blockSize100k    = 6; break;
               case '7': blockSize100k    = 7; break;
               case '8': blockSize100k    = 8; break;
               case '9': blockSize100k    = 9; break;
               case 'V':
               case 'L': license();            break;
               case 'v': verbosity++; break;
               case 'h': usage ( progName );
                         exit ( 0 );
                         break;
               default:  (fprintf) ( stderr, "%s: Bad flag `%s'\n",
                                   progName, aa->name );
                         usage ( progName );
                         exit ( 1 );
                         break;
            }
         }
      }
   }
   
   /*-- And again ... --*/
   for (aa = argList; aa != NULL; aa = aa->link) {
      if (ISFLAG("--")) break;
      if (ISFLAG("--stdout"))            srcMode          = SM_F2O;  else
      if (ISFLAG("--decompress"))        opMode           = OM_UNZ;  else
      if (ISFLAG("--compress"))          opMode           = OM_Z;    else
      if (ISFLAG("--force"))             forceOverwrite   = True;    else
      if (ISFLAG("--test"))              opMode           = OM_TEST; else
      if (ISFLAG("--keep"))              keepInputFiles   = True;    else
      if (ISFLAG("--small"))             smallMode        = True;    else
      if (ISFLAG("--quiet"))             noisy            = False;   else
      if (ISFLAG("--version"))           license();                  else
      if (ISFLAG("--license"))           license();                  else
      if (ISFLAG("--exponential"))       workFactor = 1;             else 
      if (ISFLAG("--repetitive-best"))   redundant(aa->name);        else
      if (ISFLAG("--repetitive-fast"))   redundant(aa->name);        else
      if (ISFLAG("--fast"))              blockSize100k = 1;          else
      if (ISFLAG("--best"))              blockSize100k = 9;          else
      if (ISFLAG("--verbose"))           verbosity++;                else
      if (ISFLAG("--help"))              { usage ( progName ); exit ( 0 ); }
         else
         if (strncmp ( aa->name, "--", 2) == 0) {
            (fprintf) ( stderr, "%s: Bad flag `%s'\n", progName, aa->name );
            usage ( progName );
            exit ( 1 );
         }
   }

   if (verbosity > 4) verbosity = 4;
   if (opMode == OM_Z && smallMode && blockSize100k > 2) 
      blockSize100k = 2;

   if (opMode == OM_TEST && srcMode == SM_F2O) {
      (fprintf) ( stderr, "%s: -c and -t cannot be used together.\n",
                progName );
      exit ( 1 );
   }

   if (srcMode == SM_F2O && numFileNames == 0)
      srcMode = SM_I2O;

   if (opMode != OM_Z) blockSize100k = 0;

   if (srcMode == SM_F2F) {
      signal (SIGINT,  mySignalCatcher);
      signal (SIGTERM, mySignalCatcher);
#     if BZ_UNIX
      signal (SIGHUP,  mySignalCatcher);
#     endif
   }

   if (opMode == OM_Z) {
     if (srcMode == SM_I2O) {
        compress ( NULL );
     } else {
        decode = True;
        for (aa = argList; aa != NULL; aa = aa->link) {
           if (ISFLAG("--")) { decode = False; continue; }
           if (aa->name[0] == '-' && decode) continue;
           numFilesProcessed++;
           compress ( aa->name );
        }
     }
   } 
   else

   if (opMode == OM_UNZ) {
      unzFailsExist = False;
      if (srcMode == SM_I2O) {
         uncompress ( NULL );
      } else {
         decode = True;
         for (aa = argList; aa != NULL; aa = aa->link) {
            if (ISFLAG("--")) { decode = False; continue; }
            if (aa->name[0] == '-' && decode) continue;
            numFilesProcessed++;
            uncompress ( aa->name );
         }      
      }
      if (unzFailsExist) { 
         setExit(2); 
         exit(exitValue);
      }
   } 

   else {
      testFailsExist = False;
      if (srcMode == SM_I2O) {
         testf ( NULL );
      } else {
         decode = True;
         for (aa = argList; aa != NULL; aa = aa->link) {
	    if (ISFLAG("--")) { decode = False; continue; }
            if (aa->name[0] == '-' && decode) continue;
            numFilesProcessed++;
            testf ( aa->name );
	 }
      }
      if (testFailsExist) {
	 if (noisy) {
            (fprintf) ( stderr,
               "\n"
               "You can use the `bzip2recover' program to attempt to recover\n"
               "data from undamaged sections of corrupted files.\n\n"
            );
	 }
         setExit(2);
         exit(exitValue);
      }
   }

   /* Free the argument list memory to mollify leak detectors 
      (eg) Purify, Checker.  Serves no other useful purpose.
   */
   aa = argList;
   while (aa != NULL) {
      Cell* aa2 = aa->link;
      if (aa->name != NULL) free(aa->name);
      free(aa);
      aa = aa2;
   }

   return exitValue;
}


/*-----------------------------------------------------------*/
/*--- end                                         bzip2.c ---*/
/*-----------------------------------------------------------*/
