Gzip 1.1

1 files changed, 1458 insertions, 0 deletions

diff --git a/gnu/usr.bin/gzip/gzip.c b/gnu/usr.bin/gzip/gzip.c
new file mode 100644
index 0000000..2bc1c5f
--- /dev/null
+++ b/gnu/usr.bin/gzip/gzip.c
@@ -0,0 +1,1458 @@
+/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * The unzip code was written and put in the public domain by Mark Adler.
+ * Portions of the lzw code are derived from the public domain 'compress'
+ * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
+ * Ken Turkowski, Dave Mack and Peter Jannesen.
+ *
+ * See the license_msg below and the file COPYING for the software license.
+ * See the file algorithm.doc for the compression algorithms and file formats.
+ */
+
+static char  *license_msg[] = {
+"   Copyright (C) 1992-1993 Jean-loup Gailly",
+"   This program is free software; you can redistribute it and/or modify",
+"   it under the terms of the GNU General Public License as published by",
+"   the Free Software Foundation; either version 2, or (at your option)",
+"   any later version.",
+"",
+"   This program is distributed in the hope that it will be useful,",
+"   but WITHOUT ANY WARRANTY; without even the implied warranty of",
+"   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the",
+"   GNU General Public License for more details.",
+"",
+"   You should have received a copy of the GNU General Public License",
+"   along with this program; if not, write to the Free Software",
+"   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
+0};
+
+/* Compress files with zip algorithm and 'compress' interface.
+ * See usage() and help() functions below for all options.
+ * Outputs:
+ *        file.gz:   compressed file with same mode, owner, and utimes
+ *     or stdout with -c option or if stdin used as input.
+ * If the OS does not support file names with multiple dots (MSDOS, VMS) or
+ * if the output file name had to be truncated, the original name is kept
+ * in the compressed file.
+ * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
+ *
+ * For the meaning of all compilation flags, see comments in Makefile.in.
+ */
+
+#ifndef lint
+static char rcsid[] = "$Id: gzip.c,v 0.19 1993/06/01 14:21:46 jloup Exp $";
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+#include "tailor.h"
+#include "gzip.h"
+#include "lzw.h"
+#include "revision.h"
+#include "getopt.h"
+
+		/* configuration */
+
+#ifndef NO_FCNTL_H
+#  include <fcntl.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+#endif
+
+#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
+#  include <stdlib.h>
+#else
+   extern int errno;
+#endif
+
+#if defined(DIRENT)
+#  include <dirent.h>
+   typedef struct dirent dir_type;
+#  define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
+#  define DIR_OPT "DIRENT"
+#else
+#  define NLENGTH(dirent) ((dirent)->d_namlen)
+#  ifdef SYSDIR
+#    include <sys/dir.h>
+     typedef struct direct dir_type;
+#    define DIR_OPT "SYSDIR"
+#  else
+#    ifdef SYSNDIR
+#      include <sys/ndir.h>
+       typedef struct direct dir_type;
+#      define DIR_OPT "SYSNDIR"
+#    else
+#      ifdef NDIR
+#        include <ndir.h>
+         typedef struct direct dir_type;
+#        define DIR_OPT "NDIR"
+#      else
+#        define NO_DIR
+#        define DIR_OPT "NO_DIR"
+#      endif
+#    endif
+#  endif
+#endif
+
+#ifndef NO_UTIME
+#  ifndef NO_UTIME_H
+#    include <utime.h>
+#    define TIME_OPT "UTIME"
+#  else
+#    ifdef HAVE_SYS_UTIME_H
+#      include <sys/utime.h>
+#      define TIME_OPT "SYS_UTIME"
+#    else
+       struct utimbuf {
+         time_t actime;
+         time_t modtime;
+       };
+#      define TIME_OPT ""
+#    endif
+#  endif
+#else
+#  define TIME_OPT "NO_UTIME"
+#endif
+
+#if !defined(S_ISDIR) && defined(S_IFDIR)
+#  define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+#if !defined(S_ISREG) && defined(S_IFREG)
+#  define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#endif
+
+typedef RETSIGTYPE (*sig_type) OF((int));
+
+#ifndef	O_BINARY
+#  define  O_BINARY  0  /* creation mode for open() */
+#endif
+
+#ifndef O_CREAT
+   /* Pure BSD system? */
+#  include <sys/file.h>
+#  ifndef O_CREAT
+#    define O_CREAT FCREAT
+#  endif
+#  ifndef O_EXCL
+#    define O_EXCL FEXCL
+#  endif
+#endif
+
+#ifndef S_IRUSR
+#  define S_IRUSR 0400
+#endif
+#ifndef S_IWUSR
+#  define S_IWUSR 0200
+#endif
+#define RW_USER (S_IRUSR | S_IWUSR)  /* creation mode for open() */
+
+#ifndef MAX_PATH_LEN
+#  define MAX_PATH_LEN   1024 /* max pathname length */
+#endif
+
+#define MAX_HEADER_LEN   16
+/* max length of a compressed file header, fixed part only */
+
+		/* global buffers */
+
+DECLARE(uch, inbuf,  INBUFSIZ +INBUF_EXTRA);
+DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
+DECLARE(ush, d_buf,  DIST_BUFSIZE);
+DECLARE(uch, window, 2L*WSIZE);
+#ifndef MAXSEG_64K
+    DECLARE(ush, tab_prefix, 1L<<BITS);
+#else
+    DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
+    DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
+#endif
+
+		/* local variables */
+
+int ascii = 0;        /* convert end-of-lines to local OS conventions */
+int to_stdout = 0;    /* output to stdout (-c) */
+int decompress = 0;   /* decompress (-d) */
+int force = 0;        /* don't ask questions, compress links (-f) */
+int recursive = 0;    /* recurse through directories (-r) */
+int verbose = 0;      /* be verbose (-v) */
+int quiet = 0;        /* be very quiet (-q) */
+int do_lzw = 0;       /* generate output compatible with old compress (-Z) */
+int test = 0;         /* test .gz file integrity */
+int foreground;       /* set if program run in foreground */
+char *progname;       /* program name */
+int maxbits = BITS;   /* max bits per code for LZW */
+int method = DEFLATED;/* compression method */
+int level = 5;        /* compression level */
+int exit_code = OK;   /* program exit code */
+int save_orig_name;   /* set if original name must be saved */
+int last_member;      /* set for .zip and .Z files */
+int part_nb;          /* number of parts in .gz file */
+ulg time_stamp;       /* original time stamp (modification time) */
+long ifile_size;      /* input file size, -1 for devices (debug only) */
+char *env;            /* contents of GZIP env variable */
+char **args = NULL;   /* argv pointer if GZIP env variable defined */
+char z_suffix[MAX_SUFFIX+1]; /* default suffix (can be set with --suffix) */
+int  z_len;           /* strlen(z_suffix) */
+
+long bytes_in;             /* number of input bytes */
+long bytes_out;            /* number of output bytes */
+char ifname[MAX_PATH_LEN]; /* input file name */
+char ofname[MAX_PATH_LEN]; /* output file name */
+int  remove_ofname = 0;	   /* remove output file on error */
+struct stat istat;         /* status for input file */
+int  ifd;                  /* input file descriptor */
+int  ofd;                  /* output file descriptor */
+unsigned insize;           /* valid bytes in inbuf */
+unsigned inptr;            /* index of next byte to be processed in inbuf */
+unsigned outcnt;           /* bytes in output buffer */
+
+struct option longopts[] =
+{
+ /* { name  has_arg  *flag  val } */
+    {"ascii",      0, 0, 'a'}, /* ascii text mode */
+    {"to-stdout",  0, 0, 'c'}, /* write output on standard output */
+    {"stdout",     0, 0, 'c'}, /* write output on standard output */
+    {"decompress", 0, 0, 'd'}, /* decompress */
+    {"uncompress", 0, 0, 'd'}, /* decompress */
+ /* {"encrypt",    0, 0, 'e'},    encrypt */
+    {"force",      0, 0, 'f'}, /* force overwrite of output file */
+    {"help",       0, 0, 'h'}, /* give help */
+ /* {"pkzip",      0, 0, 'k'},    force output in pkzip format */
+ /* {"list",       0, 0, 'l'},    list .gz file contents */
+    {"license",    0, 0, 'L'}, /* display software license */
+    {"quiet",      0, 0, 'q'}, /* quiet mode */
+    {"silent",     0, 0, 'q'}, /* quiet mode */
+    {"recurse",    0, 0, 'r'}, /* recurse through directories */
+    {"suffix",     1, 0, 'S'}, /* use given suffix instead of .gz */
+    {"test",       0, 0, 't'}, /* test compressed file integrity */
+    {"verbose",    0, 0, 'v'}, /* verbose mode */
+    {"version",    0, 0, 'V'}, /* display version number */
+    {"fast",       0, 0, '1'}, /* compress faster */
+    {"best",       0, 0, '9'}, /* compress better */
+    {"lzw",        0, 0, 'Z'}, /* make output compatible with old compress */
+    {"bits",       1, 0, 'b'}, /* max number of bits per code (implies -Z) */
+    { 0, 0, 0, 0 }
+};
+
+/* local functions */
+
+local void usage        OF((void));
+local void help         OF((void));
+local void license      OF((void));
+local void version      OF((void));
+local void treat_stdin  OF((void));
+local void treat_file   OF((char *iname));
+local int create_outfile OF((void));
+local int  do_stat      OF((char *name, struct stat *sbuf));
+local char *get_suffix  OF((char *name));
+local int  get_istat    OF((char *iname, struct stat *sbuf));
+local int  make_ofname  OF((void));
+local int  same_file    OF((struct stat *stat1, struct stat *stat2));
+local int name_too_long OF((char *name, struct stat *statb));
+local int  get_method   OF((int in));
+local int  check_ofname OF((void));
+local void reset_times  OF((char *name, struct stat *statb));
+local void copy_stat    OF((struct stat *ifstat));
+local void treat_dir    OF((char *dir));
+local void do_exit      OF((int exitcode));
+      int main          OF((int argc, char **argv));
+
+int (*work) OF((int infile, int outfile)) = zip; /* function to call */
+
+#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
+
+/* ======================================================================== */
+local void usage()
+{
+    fprintf(stderr, "usage: %s [-%scdfhL%stvV19] [-S suffix] [file ...]\n",
+	    progname,
+#if O_BINARY
+	    "a",
+#else
+	    "",
+#endif
+#ifdef NO_DIR
+	    ""
+#else
+	    "r"
+#endif
+	    );
+}
+
+/* ======================================================================== */
+local void help()
+{
+    static char  *help_msg[] = {
+#if O_BINARY
+ " -a --ascii       ascii text; convert end-of-lines using local conventions",
+#endif
+ " -c --stdout      write on standard output, keep original files unchanged",
+ " -d --decompress  decompress",
+/* -e --encrypt     encrypt */
+ " -f --force       force overwrite of output file and compress links",
+ " -h --help        give this help",
+/* -k --pkzip       force output in pkzip format */
+/* -l --list        list .gz file contents */
+ " -L --license     display software license",
+ " -q --quiet       suppress all warnings",
+#ifndef NO_DIR
+ " -r --recurse     recurse through directories",
+#endif
+#ifdef MAX_EXT_CHARS
+ " -S --suffix .gz  use suffix .gz instead of .z",
+#else
+ " -S --suffix .z   use suffix .z instead of .gz",
+#endif
+ " -t --test        test compressed file integrity",
+ " -v --verbose     verbose mode",
+ " -V --version     display version number",
+ " -1 --fast        compress faster",
+ " -9 --best        compress better",
+#ifdef LZW
+ " -Z --lzw         produce output compatible with old compress",
+ " -b --bits maxbits   max number of bits per code (implies -Z)",
+#endif
+ " file...          files to (de)compress. If none given, use standard input.",
+  0};
+    char **p = help_msg;
+
+    fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
+    usage();
+    while (*p) fprintf(stderr, "%s\n", *p++);
+}
+
+/* ======================================================================== */
+local void license()
+{
+    char **p = license_msg;
+
+    fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
+    while (*p) fprintf(stderr, "%s\n", *p++);
+}
+
+/* ======================================================================== */
+local void version()
+{
+    fprintf(stderr,"%s %s (%s)\n", progname, VERSION, REVDATE);
+
+    fprintf(stderr, "Compilation options:\n%s %s ", DIR_OPT, TIME_OPT);
+#ifdef STDC_HEADERS
+    fprintf(stderr, "STDC_HEADERS ");
+#endif
+#ifdef HAVE_UNISTD_H
+    fprintf(stderr, "HAVE_UNISTD_H ");
+#endif
+#ifdef NO_MEMORY_H
+    fprintf(stderr, "NO_MEMORY_H ");
+#endif
+#ifdef NO_STRING_H
+    fprintf(stderr, "NO_STRING_H ");
+#endif
+#ifdef NO_SYMLINK
+    fprintf(stderr, "NO_SYMLINK ");
+#endif
+#ifdef NO_MULTIPLE_DOTS
+    fprintf(stderr, "NO_MULTIPLE_DOTS ");
+#endif
+#ifdef NO_CHOWN
+    fprintf(stderr, "NO_CHOWN ");
+#endif
+#ifdef PROTO
+    fprintf(stderr, "PROTO ");
+#endif
+#ifdef ASMV
+    fprintf(stderr, "ASMV ");
+#endif
+#ifdef DEBUG
+    fprintf(stderr, "DEBUG ");
+#endif
+#ifdef DYN_ALLOC
+    fprintf(stderr, "DYN_ALLOC ");
+#endif
+#ifdef MAXSEG_64K
+    fprintf(stderr, "MAXSEG_64K");
+#endif
+    fprintf(stderr, "\n");
+}
+
+/* ======================================================================== */
+int main (argc, argv)
+    int argc;
+    char **argv;
+{
+    int file_count = 0; /* number of files to precess */
+    int proglen;        /* length of progname */
+    int optc;           /* current option */
+
+    EXPAND(argc, argv); /* wild card expansion if necessary */
+
+    progname = basename(argv[0]);
+    proglen = strlen(progname);
+
+    /* Suppress .exe for MSDOS, OS/2 and VMS: */
+    if (proglen > 4 && strequ(progname+proglen-4, ".exe")) {
+        progname[proglen-4] = '\0';
+    }
+
+    /* Add options in GZIP environment variable if there is one */
+    env = add_envopt(&argc, &argv, OPTIONS_VAR);
+    if (env != NULL) args = argv;
+
+    foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
+    if (foreground) {
+	signal (SIGINT, (sig_type)abort_gzip);
+    }
+#ifdef SIGTERM
+    signal(SIGTERM, (sig_type)abort_gzip);
+#endif
+#ifdef SIGHUP
+    signal(SIGHUP,  (sig_type)abort_gzip);
+#endif
+
+#ifndef GNU_STANDARD
+    /* For compatibility with old compress, use program name as an option.
+     * If you compile with -DGNU_STANDARD, this program will behave as
+     * gzip even if it is invoked under the name gunzip or zcat.
+     *
+     * Systems which do not support links can still use -d or -dc.
+     * Ignore an .exe extension for MSDOS, OS/2 and VMS.
+     */
+    if (  strncmp(progname, "un",  2) == 0     /* ungzip, uncompress */
+       || strncmp(progname, "gun", 3) == 0) {  /* gunzip */
+	decompress = 1;
+    } else if (strequ(progname+1, "cat")       /* zcat, pcat, gcat */
+	    || strequ(progname, "gzcat")) {    /* gzcat */
+	decompress = to_stdout = 1;
+    }
+#endif
+
+    strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix)-1);
+    z_len = strlen(z_suffix);
+
+    while ((optc = getopt_long (argc, argv, "ab:cdfhLqrS:tvVZ123456789",
+				longopts, (int *)0)) != EOF) {
+	switch (optc) {
+        case 'a':
+            ascii = 1; break;
+	case 'b':
+	    maxbits = atoi(optarg);
+	    break;
+	case 'c':
+	    to_stdout = 1; break;
+	case 'd':
+	    decompress = 1; break;
+	case 'f':
+	    force++; break;
+	case 'h': case 'H': case '?':
+	    help(); do_exit(OK); break;
+	case 'L':
+	    license(); do_exit(OK); break;
+	case 'q':
+	    quiet = 1; verbose = 0; break;
+	case 'r':
+#ifdef NO_DIR
+	    fprintf(stderr, "%s: -r not supported on this system\n", progname);
+	    usage();
+	    do_exit(ERROR); break;
+#else
+	    recursive = 1; break;
+#endif
+	case 'S':
+#ifdef NO_MULTIPLE_DOTS
+            if (*optarg == '.') optarg++;
+#endif
+            z_len = strlen(optarg);
+            if (z_len == 0 || z_len > MAX_SUFFIX) {
+                fprintf(stderr, "%s: incorrect suffix '%s'\n",
+                        progname, optarg);
+                do_exit(ERROR);
+            }
+            strcpy(z_suffix, optarg);
+            break;
+	case 't':
+	    test = decompress = to_stdout = 1;
+	    break;
+	case 'v':
+	    verbose++; quiet = 0; break;
+	case 'V':
+	    version(); do_exit(OK); break;
+	case 'Z':
+#ifdef LZW
+	    do_lzw = 1; break;
+#else
+	    fprintf(stderr, "%s: -Z not supported in this version\n",
+		    progname);
+	    usage();
+	    do_exit(ERROR); break;
+#endif
+	case '1':  case '2':  case '3':  case '4':
+	case '5':  case '6':  case '7':  case '8':  case '9':
+	    level = optc - '0';
+	    break;
+	default:
+	    /* Error message already emitted by getopt_long. */
+	    usage();
+	    do_exit(ERROR);
+	}
+    } /* loop on all arguments */
+
+    file_count = argc - optind;
+
+#if O_BINARY
+#else
+    if (ascii && !quiet) {
+	fprintf(stderr, "%s: option --ascii ignored on this system\n",
+		progname);
+    }
+#endif
+    if (do_lzw && !decompress) work = lzw;
+
+    /* Allocate all global buffers (for DYN_ALLOC option) */
+    ALLOC(uch, inbuf,  INBUFSIZ +INBUF_EXTRA);
+    ALLOC(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA);
+    ALLOC(ush, d_buf,  DIST_BUFSIZE);
+    ALLOC(uch, window, 2L*WSIZE);
+#ifndef MAXSEG_64K
+    ALLOC(ush, tab_prefix, 1L<<BITS);
+#else
+    ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
+    ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
+#endif
+
+    /* And get to work */
+    if (file_count != 0) {
+	if (to_stdout && !test && (!decompress || !ascii)) {
+	    SET_BINARY_MODE(fileno(stdout));
+	}
+        while (optind < argc) {
+	    treat_file(argv[optind++]);
+	}
+    } else {  /* Standard input */
+	treat_stdin();
+    }
+    do_exit(exit_code);
+    return exit_code; /* just to avoid lint warning */
+}
+
+/* ========================================================================
+ * Compress or decompress stdin
+ */
+local void treat_stdin()
+{
+    if (!force && isatty(fileno((FILE *)(decompress ? stdin : stdout)))) {
+	/* Do not send compressed data to the terminal or read it from
+	 * the terminal. We get here when user invoked the program
+	 * without parameters, so be helpful. According to the GNU standards:
+	 *
+	 *   If there is one behavior you think is most useful when the output
+	 *   is to a terminal, and another that you think is most useful when
+	 *   the output is a file or a pipe, then it is usually best to make
+	 *   the default behavior the one that is useful with output to a
+	 *   terminal, and have an option for the other behavior.
+	 *
+	 * Here we use the --force option to get the other behavior.
+	 */
+	fprintf(stderr,
+    "%s: compressed data not %s a terminal. Use -f to force %scompression.\n",
+		progname, decompress ? "read from" : "written to",
+		decompress ? "de" : "");
+	fprintf(stderr,"For help, type: %s -h\n", progname);
+	do_exit(ERROR);
+    }
+
+    if (decompress || !ascii) {
+	SET_BINARY_MODE(fileno(stdin));
+    }
+    if (!test && (!decompress || !ascii)) {
+	SET_BINARY_MODE(fileno(stdout));
+    }
+    strcpy(ifname, "stdin");
+    strcpy(ofname, "stdout");
+
+    /* Get the time stamp on the input file. */
+#ifdef NO_STDIN_FSTAT
+    time_stamp = 0; /* time unknown */
+#else
+    if (fstat(fileno(stdin), &istat) != 0) {
+	error("fstat(stdin)");
+    }
+    /* If you do not wish to save the time stamp when input comes from a pipe,
+     * compile with -DNO_PIPE_TIMESTAMP.
+     */
+#ifdef NO_PIPE_TIMESTAMP
+    if (!S_ISREG(istat.st_mode))
+	time_stamp = 0;
+    else
+#endif
+	time_stamp = istat.st_mtime;
+#endif
+    ifile_size = -1L; /* convention for unknown size */
+
+    clear_bufs(); /* clear input and output buffers */
+    to_stdout = 1;
+    part_nb = 0;
+
+    if (decompress) {
+	method = get_method(ifd);
+	if (method < 0) {
+	    do_exit(exit_code); /* error message already emitted */
+	}
+    }
+
+    /* Actually do the compression/decompression. Loop over zipped members.
+     */
+    for (;;) {
+	if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
+
+	if (!decompress || last_member || inptr == insize) break;
+	/* end of file */
+
+	method = get_method(ifd);
+	if (method < 0) return; /* error message already emitted */
+	bytes_out = 0;            /* required for length check */
+    }
+
+    if (verbose) {
+	if (test) {
+	    fprintf(stderr, " OK");
+
+	} else if (decompress) {
+	    display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out);
+	} else {
+	    display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in);
+	}
+	fprintf(stderr, "\n");
+    }
+}
+
+/* ========================================================================
+ * Compress or decompress the given file
+ */
+local void treat_file(iname)
+    char *iname;
+{
+    /* Check if the input file is present, set ifname and istat: */
+    if (get_istat(iname, &istat) != OK) return;
+
+    /* If the input name is that of a directory, recurse or ignore: */
+    if (S_ISDIR(istat.st_mode)) {
+#ifndef NO_DIR
+	if (recursive) {
+	    struct stat st;
+	    st = istat;
+	    treat_dir(iname);
+	    /* Warning: ifname is now garbage */
+	    reset_times (iname, &st);
+	} else
+#endif
+	WARN((stderr,"%s: %s is a directory -- ignored\n", progname, ifname));
+	return;
+    }
+    if (!S_ISREG(istat.st_mode)) {
+	WARN((stderr,
+	      "%s: %s is not a directory or a regular file - ignored\n",
+	      progname, ifname));
+	return;
+    }
+    if (istat.st_nlink > 1 && !to_stdout && !force) {
+	WARN((stderr, "%s: %s has %d other link%c -- unchanged\n",
+	      progname, ifname,
+	      (int)istat.st_nlink - 1, istat.st_nlink > 2 ? 's' : ' '));
+	return;
+    }
+
+    ifile_size = istat.st_size;
+    time_stamp = istat.st_mtime;
+
+    /* Generate output file name */
+    if (to_stdout) {
+	strcpy(ofname, "stdout");
+
+    } else if (make_ofname() != OK) {
+	return;
+    }
+
+    /* Open the input file and determine compression method. The mode
+     * parameter is ignored but required by some systems (VMS) and forbidden
+     * on other systems (MacOS).
+     */
+    ifd = OPEN(ifname, ascii && !decompress ? O_RDONLY : O_RDONLY | O_BINARY,
+	       RW_USER);
+    if (ifd == -1) {
+	fprintf(stderr, "%s: ", progname);
+	perror(ifname);
+	exit_code = ERROR;
+	return;
+    }
+    clear_bufs(); /* clear input and output buffers */
+    part_nb = 0;
+
+    if (decompress) {
+	method = get_method(ifd); /* updates ofname if original given */
+	if (method < 0) {
+	    close(ifd);
+	    return;               /* error message already emitted */
+	}
+    }
+
+    /* If compressing to a file, check if ofname is not ambiguous
+     * because the operating system truncates names. Otherwise, generate
+     * a new ofname and save the original name in the compressed file.
+     */
+    if (to_stdout) {
+	ofd = fileno(stdout);
+	/* keep remove_ofname as zero */
+    } else {
+	if (create_outfile() != OK) return;
+
+	if (save_orig_name && !verbose && !quiet) {
+	    fprintf(stderr, "%s: %s compressed to %s\n",
+		    progname, ifname, ofname);
+	}
+    }
+    if (verbose) {
+	fprintf(stderr, "%s:\t%s", ifname, (int)strlen(ifname) >= 15 ? 
+		"" : ((int)strlen(ifname) >= 7 ? "\t" : "\t\t"));
+    }
+
+    /* Actually do the compression/decompression. Loop over zipped members.
+     */
+    for (;;) {
+	if ((*work)(ifd, ofd) != OK) {
+	    method = -1; /* force cleanup */
+	    break;
+	}
+	if (!decompress || last_member || inptr == insize) break;
+	/* end of file */
+
+	method = get_method(ifd);
+	if (method < 0) break;    /* error message already emitted */
+	bytes_out = 0;            /* required for length check */
+    }
+
+    close(ifd);
+    if (!to_stdout && close(ofd)) {
+	write_error();
+    }
+    if (method == -1) {
+	if (!to_stdout) unlink (ofname);
+	return;
+    }
+    /* Display statistics */
+    if(verbose) {
+	if (test) {
+	    fprintf(stderr, " OK");
+	} else if (decompress) {
+	    display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out);
+	} else {
+	    display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in);
+	}
+	if (!test && !to_stdout) {
+	    fprintf(stderr, " -- replaced with %s", ofname);
+	}
+	fprintf(stderr, "\n");
+    }
+    /* Copy modes, times, ownership, and remove the input file */
+    if (!to_stdout) {
+	copy_stat(&istat);
+    }
+}
+
+/* ========================================================================
+ * Create the output file. Return OK or ERROR.
+ * Try several times if necessary to avoid truncating the z_suffix. For
+ * example, do not create a compressed file of name "1234567890123."
+ * IN assertions: the input file has already been open (ifd is set) and
+ *   ofname has already been updated if there was an original name.
+ * OUT assertions: ifd and ofd are closed in case of error.
+ */
+local int create_outfile()
+{
+    struct stat	ostat; /* stat for ofname */
+    int len;
+    int flags = O_WRONLY | O_CREAT | O_EXCL | O_BINARY;
+
+    if (ascii && decompress) {
+	flags &= ~O_BINARY; /* force ascii text mode */
+    }
+    for (;;) {
+        len = strlen(ofname);
+        if (len == 0 || ofname[len] == PATH_SEP) break;
+	if (check_ofname() != OK) {
+	    close(ifd);
+	    return ERROR;
+	}
+	/* Create the output file */
+	remove_ofname = 1;
+	ofd = OPEN(ofname, flags, RW_USER);
+	if (ofd == -1) {
+	    perror(ofname);
+	    close(ifd);
+	    exit_code = ERROR;
+	    return ERROR;
+	}
+
+	/* Check for name truncation on new file (1234567890123.gz) */
+	if (fstat(ofd, &ostat) != 0) {
+	    fprintf(stderr, "%s: ", progname);
+	    perror(ofname);
+	    close(ifd); close(ofd);
+	    unlink(ofname);
+	    exit_code = ERROR;
+	    return ERROR;
+	}
+	if (!name_too_long(ofname, &ostat)) return OK;
+
+	if (decompress) {
+	    /* name might be too long if an original name was saved */
+	    WARN((stderr, "%s: %s: warning, name truncated\n",
+		  progname, ofname));
+	    return OK;
+	} else {
+#ifdef NO_MULTIPLE_DOTS
+	    /* Should never happen, see check_ofname() */
+	    fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
+	    do_exit(ERROR);
+#else
+	    close(ofd);
+	    unlink(ofname);
+	    save_orig_name = 1;
+	    strcpy(ofname+strlen(ofname)-z_len-1, z_suffix);
+            /* 123456789012.gz -> 12345678901.gz */
+#endif
+	} /* decompress ? */
+    } /* while non null name */
+
+    close(ifd);
+    fprintf(stderr, "%s: %s: name too long\n", progname, ofname);
+    exit_code = ERROR;
+    return ERROR;
+}
+
+/* ========================================================================
+ * Use lstat if available, except for -c or -f. Use stat otherwise.
+ * This allows links when not removing the original file.
+ */
+local int do_stat(name, sbuf)
+    char *name;
+    struct stat *sbuf;
+{
+    errno = 0;
+#if (defined(S_IFLNK) || defined (S_ISLNK)) && !defined(NO_SYMLINK)
+    if (!to_stdout && !force) {
+	return lstat(name, sbuf);
+    }
+#endif
+    return stat(name, sbuf);
+}
+
+/* ========================================================================
+ * Return a pointer to the 'z' suffix of a file name, or NULL. For all
+ * systems, ".gz", ".z", ".Z", ".taz", ".tgz", "-gz", "-z" and "_z" are
+ * accepted suffixes, in addition to the value of the --suffix option.
+ * ".tgz" is a useful convention for tar.z files on systems limited
+ * to 3 characters extensions. On such systems, ".?z" and ".??z" are
+ * also accepted suffixes. For Unix, we do not want to accept any
+ * .??z suffix as indicating a compressed file; some people use .xyz
+ * to denote volume data.
+ */
+local char *get_suffix(name)
+    char *name;
+{
+    int nlen, slen;
+    char suffix[MAX_SUFFIX+3]; /* last chars of name, forced to lower case */
+    static char *known_suffixes[] =
+       {z_suffix, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z",
+#ifdef MAX_EXT_CHARS
+          "z",
+#endif
+          NULL};
+    char **suf = known_suffixes;
+
+    if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */
+
+    nlen = strlen(name);
+    if (nlen <= MAX_SUFFIX+2) {
+        strcpy(suffix, name);
+    } else {
+        strcpy(suffix, name+nlen-MAX_SUFFIX-2);
+    }
+#ifdef SUFFIX_SEP
+    /* strip a version number from the file name */
+    {
+	char *v = strrchr(suffix, SUFFIX_SEP);
+	if (v != NULL) *v = '\0', nlen = v - name;
+    }
+#endif
+    strlwr(suffix);
+    slen = strlen(suffix);
+    do {
+       int s = strlen(*suf);
+       if (slen > s && suffix[slen-s-1] != PATH_SEP
+           && strequ(suffix + slen - s, *suf)) {
+           return name+nlen-s;
+       }
+    } while (*++suf != NULL);
+
+    return NULL;
+}
+
+
+/* ========================================================================
+ * Set ifname to the input file name (with a suffix appended if necessary)
+ * and istat to its stats. For decompression, if no file exists with the
+ * original name, try adding successively z_suffix, .gz, .z, -z and .Z.
+ * For MSDOS, we try only z_suffix and z.
+ * Return OK or ERROR.
+ */
+local int get_istat(iname, sbuf)
+    char *iname;
+    struct stat *sbuf;
+{
+    int ilen;  /* strlen(ifname) */
+    static char *suffixes[] = {z_suffix, ".gz", ".z", "-z", ".Z", NULL};
+    char **suf = suffixes;
+    char *s;
+#ifdef NO_MULTIPLE_DOTS
+    char *dot; /* pointer to ifname extension, or NULL */
+#endif
+
+    strcpy(ifname, iname);
+
+    /* If input file exists, return OK. */
+    if (do_stat(ifname, sbuf) == 0) return OK;
+
+    if (!decompress || errno != ENOENT) {
+	perror(ifname);
+	exit_code = ERROR;
+	return ERROR;
+    }
+    /* file.ext doesn't exist, try adding a suffix.
+     */
+    s = get_suffix(ifname);
+    if (s != NULL) {
+	perror(ifname); /* ifname already has z suffix and does not exist */
+	exit_code = ERROR;
+	return ERROR;
+    }
+#ifdef SUFFIX_SEP
+    /* strip a version number from the input file name */
+    if ((s = strrchr(ifname, SUFFIX_SEP)) != NULL) *s = '\0';
+#endif
+#ifdef NO_MULTIPLE_DOTS
+    dot = strrchr(ifname, '.');
+    if (dot == NULL) {
+        strcat(ifname, ".");
+        dot = strrchr(ifname, '.');
+    }
+#endif
+    ilen = strlen(ifname);
+    if (strequ(z_suffix, ".gz")) suf++;
+
+    /* Search for all suffixes */
+    do {
+        s = *suf;
+#ifdef NO_MULTIPLE_DOTS
+        if (*s == '.') s++;
+#endif
+#ifdef MAX_EXT_CHARS
+        strcpy(ifname, iname);
+        /* Needed if the suffixes are not sorted by increasing length */
+
+        if (*dot == '\0') strcpy(dot, ".");
+        dot[MAX_EXT_CHARS+1-strlen(s)] = '\0';
+#endif
+        strcat(ifname, s);
+        if (do_stat(ifname, sbuf) == 0) return OK;
+	ifname[ilen] = '\0';
+    } while (*++suf != NULL);
+
+    /* No suffix found, complain using z_suffix: */
+#ifdef MAX_EXT_CHARS
+    strcpy(ifname, iname);
+    if (*dot == '\0') strcpy(dot, ".");
+    dot[MAX_EXT_CHARS+1-z_len] = '\0';
+#endif
+    strcat(ifname, z_suffix);
+    perror(ifname);
+    exit_code = ERROR;
+    return ERROR;
+}
+
+/* ========================================================================
+ * Generate ofname given ifname. Return OK, or WARNING if file must be skipped.
+ * Initializes save_orig_name.
+ * IN assertion: this function is not called if to_stdout is true.
+ */
+local int make_ofname()
+{
+    char *suff;            /* ofname z suffix */
+
+    strcpy(ofname, ifname);
+    suff = get_suffix(ofname);
+
+    if (decompress) {
+	if (suff == NULL) {
+	    WARN((stderr,"%s: %s: unknown suffix -- ignored\n",
+		  progname, ifname));
+	    return WARNING;
+	}
+	/* Make a special case for .tgz and .taz: */
+	strlwr(suff);
+	if (strequ(suff, ".tgz") || strequ(suff, ".taz")) {
+	    strcpy(suff, ".tar");
+	} else {
+	    *suff = '\0'; /* strip z suffix and optional version number */
+	}
+        /* ofname might be changed later if infile contains an original name */
+
+    } else if (suff != NULL) {
+	/* Avoid annoying messages with -r (see treat_dir()) */
+	if (verbose || (!recursive && !quiet)) {
+	    fprintf(stderr, "%s: %s already has %s suffix -- unchanged\n",
+		    progname, ifname, suff);
+	}
+	if (exit_code == OK) exit_code = WARNING;
+	return WARNING;
+    } else {
+        save_orig_name = 0;
+
+#ifdef SUFFIX_SEP
+	/* strip a version number from the file name */
+	if ((suff = strrchr(ofname, SUFFIX_SEP)) != NULL) *suff = '\0';
+#endif
+
+#ifdef NO_MULTIPLE_DOTS
+	suff = strrchr(ofname, '.');
+	if (suff == NULL) {
+            strcat(ofname, ".");
+#  ifdef MAX_EXT_CHARS
+        /* On the Atari and some versions of MSDOS, name_too_long()
+         * does not work correctly because of a bug in stat(). So we
+         * must truncate here.
+         */
+        } else if (strlen(suff)-1 + z_len > MAX_SUFFIX) {
+            suff[MAX_SUFFIX+1-z_len] = '\0';
+            save_orig_name = 1;
+#  endif
+        }
+#endif /* NO_MULTIPLE_DOTS */
+	strcat(ofname, z_suffix);
+
+    } /* decompress ? */
+    return OK;
+}
+
+
+/* ========================================================================
+ * Check the magic number of the input file and update ofname if an
+ * original name was given and to_stdout is not set.
+ * Return the compression method, -1 for error, -2 for warning.
+ * Set inptr to the offset of the next byte to be processed.
+ * This function may be called repeatedly for an input file consisting
+ * of several contiguous gzip'ed members.
+ * IN assertions: there is at least one remaining compressed member.
+ *   If the member is a zip file, it must be the only one.
+ */
+local int get_method(in)
+    int in;        /* input file descriptor */
+{
+    uch flags;
+    char magic[2]; /* magic header */
+
+    magic[0] = (char)get_byte();
+    magic[1] = (char)get_byte();
+
+    time_stamp = istat.st_mtime; /* may be modified later for some methods */
+    method = -1;                 /* unknown yet */
+    part_nb++;                   /* number of parts in gzip file */
+    header_bytes = 0;
+    last_member = RECORD_IO;
+    /* assume multiple members in gzip file except for record oriented I/O */
+
+    if (memcmp(magic, GZIP_MAGIC, 2) == 0
+        || memcmp(magic, OLD_GZIP_MAGIC, 2) == 0) {
+
+	work = unzip;
+	method = (int)get_byte();
+	flags  = (uch)get_byte();
+
+	if ((flags & ENCRYPTED) != 0) {
+	    fprintf(stderr,
+		    "%s: %s is encrypted -- get newer version of gzip\n",
+		    progname, ifname);
+	    exit_code = ERROR;
+	    return -1;
+	}
+	if ((flags & CONTINUATION) != 0) {
+	    fprintf(stderr,
+	   "%s: %s is a a multi-part gzip file -- get newer version of gzip\n",
+		    progname, ifname);
+	    exit_code = ERROR;
+	    if (force <= 1) return -1;
+	}
+	if ((flags & RESERVED) != 0) {
+	    fprintf(stderr,
+		    "%s: %s has flags 0x%x -- get newer version of gzip\n",
+		    progname, ifname, flags);
+	    exit_code = ERROR;
+	    if (force <= 1) return -1;
+	}
+	time_stamp  = (ulg)get_byte();
+	time_stamp |= ((ulg)get_byte()) << 8;
+	time_stamp |= ((ulg)get_byte()) << 16;
+	time_stamp |= ((ulg)get_byte()) << 24;
+
+	(void)get_byte();  /* Ignore extra flags for the moment */
+	(void)get_byte();  /* Ignore OS type for the moment */
+
+	if ((flags & CONTINUATION) != 0) {
+	    unsigned part = (unsigned)get_byte();
+	    part |= ((unsigned)get_byte())<<8;
+	    if (verbose) {
+		fprintf(stderr,"%s: %s: part number %u\n",
+			progname, ifname, part);
+	    }
+	}
+	if ((flags & EXTRA_FIELD) != 0) {
+	    unsigned len = (unsigned)get_byte();
+	    len |= ((unsigned)get_byte())<<8;
+	    if (verbose) {
+		fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n",
+			progname, ifname, len);
+	    }
+	    while (len--) (void)get_byte();
+	}
+
+	/* Get original file name if it was truncated */
+	if ((flags & ORIG_NAME) != 0) {
+	    if (to_stdout || part_nb > 1) {
+		/* Discard the old name */
+		char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */
+		while ((c=get_byte()) != 0) c++;
+	    } else {
+		/* Copy the base name. Keep a directory prefix intact. */
+		char *p = basename(ofname);
+		for (;;) {
+		    *p = (char)get_char();
+		    if (*p++ == '\0') break;
+		    if (p >= ofname+sizeof(ofname)) {
+			error("corrupted input -- file name too large");
+		    }
+		}
+	    } /* to_stdout */
+	} /* orig_name */
+
+	/* Discard file comment if any */
+	if ((flags & COMMENT) != 0) {
+	    while (get_char() != 0) /* null */ ;
+	}
+	if (part_nb == 1) {
+	    header_bytes = inptr + 2*sizeof(long); /* include crc and size */
+	}
+
+    } else if (memcmp(magic, PKZIP_MAGIC, 2) == 0 && inptr == 2
+	    && memcmp((char*)inbuf, PKZIP_MAGIC, 4) == 0) {
+	/* To simplify the code, we support a zip file when alone only.
+         * We are thus guaranteed that the entire local header fits in inbuf.
+         */
+        inptr = 0;
+	work = unzip;
+	if (check_zipfile(in) != OK) return -1;
+	/* check_zipfile may get ofname from the local header */
+	last_member = 1;
+
+    } else if (memcmp(magic, PACK_MAGIC, 2) == 0) {
+	work = unpack;
+	method = PACKED;
+    } else if (memcmp(magic, LZW_MAGIC, 2) == 0) {
+	work = unlzw;
+	method = COMPRESSED;
+	last_member = 1;
+    }
+    if (method >= 0) return method;
+    if (part_nb == 1) {
+	fprintf(stderr, "\n%s: %s: not in gzip format\n", progname, ifname);
+	exit_code = ERROR;
+	return -1;
+    } else {
+	WARN((stderr, "\n%s: %s: trailing garbage ignored\n",
+	      progname, ifname));
+	return -2;
+    }
+}
+
+/* ========================================================================
+ * Return true if the two stat structures correspond to the same file.
+ */
+local int same_file(stat1, stat2)
+    struct stat *stat1;
+    struct stat *stat2;
+{
+    return stat1->st_ino   == stat2->st_ino
+	&& stat1->st_dev   == stat2->st_dev
+#ifdef NO_ST_INO
+        /* Can't rely on st_ino and st_dev, use other fields: */
+	&& stat1->st_mode  == stat2->st_mode
+	&& stat1->st_uid   == stat2->st_uid
+	&& stat1->st_gid   == stat2->st_gid
+	&& stat1->st_size  == stat2->st_size
+	&& stat1->st_atime == stat2->st_atime
+	&& stat1->st_mtime == stat2->st_mtime
+	&& stat1->st_ctime == stat2->st_ctime
+#endif
+	    ;
+}
+
+/* ========================================================================
+ * Return true if a file name is ambiguous because the operating system
+ * truncates file names.
+ */
+local int name_too_long(name, statb)
+    char *name;           /* file name to check */
+    struct stat *statb;   /* stat buf for this file name */
+{
+    int s = strlen(name);
+    char c = name[s-1];
+    struct stat	tstat; /* stat for truncated name */
+    int res;
+
+    tstat = *statb;      /* Just in case OS does not fill all fields */
+    name[s-1] = '\0';
+    res = stat(name, &tstat) == 0 && same_file(statb, &tstat);
+    name[s-1] = c;
+    Trace((stderr, " too_long(%s) => %d\n", name, res));
+    return res;
+}
+
+/* ========================================================================
+ * If compressing to a file, check if ofname is not ambiguous
+ * because the operating system truncates names. Otherwise, generate
+ * a new ofname and save the original name in the compressed file.
+ * If the compressed file already exists, ask for confirmation.
+ *    The check for name truncation is made dynamically, because different
+ * file systems on the same OS might use different truncation rules (on SVR4
+ * s5 truncates to 14 chars and ufs does not truncate).
+ *    This function returns -1 if the file must be skipped, and
+ * updates save_orig_name if necessary.
+ * IN assertions: save_orig_name is already set if ofname has been
+ * already truncated because of NO_MULTIPLE_DOTS. The input file has
+ * already been open and istat is set.
+ */
+local int check_ofname()
+{
+    int s = strlen(ofname);
+    struct stat	ostat; /* stat for ofname */
+
+    if (stat(ofname, &ostat) != 0) return 0;
+
+    /* Check for name truncation on existing file: */
+#ifdef NO_MULTIPLE_DOTS
+    if (!decompress && name_too_long(ofname, &ostat)) {
+#else
+    if (!decompress && s > 8 && name_too_long(ofname, &ostat)) {
+#endif
+	save_orig_name = 1;
+	strcpy(ofname+s-z_len-1, z_suffix);  /* f.ext.gz -> f.ex.gz  */
+
+	if (stat(ofname, &ostat) != 0) return 0;
+    } /* !decompress && name_too_long */
+
+    /* Check that the input and output files are different (could be
+     * the same by name truncation or links).
+     */
+    if (same_file(&istat, &ostat)) {
+	fprintf(stderr, "%s: %s and %s are the same file\n",
+		progname, ifname, ofname);
+	exit_code = ERROR;
+	return ERROR;
+    }
+    /* Ask permission to overwrite the existing file */
+    if (!force) {
+	char response[80];
+	strcpy(response,"n");
+	fprintf(stderr, "%s: %s already exists;", progname, ofname);
+	if (foreground && isatty(fileno(stdin))) {
+	    fprintf(stderr, " do you wish to overwrite (y or n)? ");
+	    fflush(stderr);
+	    (void)fgets(response, sizeof(response)-1, stdin);
+	}
+	if (tolow(*response) != 'y') {
+	    fprintf(stderr, "\tnot overwritten\n");
+	    if (exit_code == OK) exit_code = WARNING;
+	    return ERROR;
+	}
+    }
+    (void) chmod(ofname, 0777);
+    if (unlink(ofname)) {
+	fprintf(stderr, "%s: ", progname);
+	perror(ofname);
+	exit_code = ERROR;
+	return ERROR;
+    }
+    return OK;
+}
+
+
+/* ========================================================================
+ * Set the access and modification times from the given stat buffer.
+ */
+local void reset_times (name, statb)
+    char *name;
+    struct stat *statb;
+{
+#ifndef NO_UTIME
+    struct utimbuf	timep;
+
+    /* Copy the time stamp */
+    timep.actime  = statb->st_atime;
+    timep.modtime = statb->st_mtime;
+
+    /* Some systems (at least OS/2) do not support utime on directories */
+    if (utime(name, &timep) && !S_ISDIR(statb->st_mode)) {
+	WARN((stderr, "%s: ", progname));
+	if (!quiet) perror(ofname);
+    }
+#else
+    name = name; statb = statb; /* avoid warnings */
+#endif
+}
+
+
+/* ========================================================================
+ * Copy modes, times, ownership from input file to output file.
+ * IN assertion: to_stdout is false.
+ */
+local void copy_stat(ifstat)
+    struct stat *ifstat;
+{
+#ifndef NO_UTIME
+    if (decompress && time_stamp != 0 && ifstat->st_mtime != time_stamp) {
+	ifstat->st_mtime = time_stamp;
+	if (verbose) {
+	    fprintf(stderr, "%s: time stamp restored\n", ofname);
+	}
+    }
+    reset_times(ofname, ifstat);
+#endif
+    /* Copy the protection modes */
+    if (chmod(ofname, ifstat->st_mode & 07777)) {
+	WARN((stderr, "%s: ", progname));
+	if (!quiet) perror(ofname);
+    }
+#ifndef NO_CHOWN
+    chown(ofname, ifstat->st_uid, ifstat->st_gid);  /* Copy ownership */
+#endif
+    remove_ofname = 0;
+    /* It's now safe to remove the input file: */
+    (void) chmod(ifname, 0777);
+    if (unlink(ifname)) {
+	WARN((stderr, "%s: ", progname));
+	if (!quiet) perror(ifname);
+    }
+}
+
+#ifndef NO_DIR
+
+/* ========================================================================
+ * Recurse through the given directory. This code is taken from ncompress.
+ */
+local void treat_dir(dir)
+    char *dir;
+{
+    dir_type *dp;
+    DIR      *dirp;
+    char     nbuf[MAX_PATH_LEN];
+    int      len;
+
+    dirp = opendir(dir);
+    
+    if (dirp == NULL) {
+	fprintf(stderr, "%s: %s unreadable\n", progname, dir);
+	exit_code = ERROR;
+	return ;
+    }
+    /*
+     ** WARNING: the following algorithm could occasionally cause
+     ** compress to produce error warnings of the form "<filename>.gz
+     ** already has .gz suffix - ignored". This occurs when the
+     ** .gz output file is inserted into the directory below
+     ** readdir's current pointer.
+     ** These warnings are harmless but annoying, so they are suppressed
+     ** with option -r (except when -v is on). An alternative
+     ** to allowing this would be to store the entire directory
+     ** list in memory, then compress the entries in the stored
+     ** list. Given the depth-first recursive algorithm used here,
+     ** this could use up a tremendous amount of memory. I don't
+     ** think it's worth it. -- Dave Mack
+     ** (An other alternative might be two passes to avoid depth-first.)
+     */
+    
+    while ((dp = readdir(dirp)) != NULL) {
+
+	if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) {
+	    continue;
+	}
+	len = strlen(dir);
+	if (len + NLENGTH(dp) + 1 < MAX_PATH_LEN - 1) {
+	    strcpy(nbuf,dir);
+	    if (len != 0 /* dir = "" means current dir on Amiga */
+#ifdef PATH_SEP2
+		&& dir[len-1] != PATH_SEP2
+#endif
+#ifdef PATH_SEP3
+		&& dir[len-1] != PATH_SEP3
+#endif
+	    ) {
+		nbuf[len++] = PATH_SEP;
+	    }
+	    strcpy(nbuf+len, dp->d_name);
+	    treat_file(nbuf);
+	} else {
+	    fprintf(stderr,"%s: %s/%s: pathname too long\n",
+		    progname, dir, dp->d_name);
+	    exit_code = ERROR;
+	}
+    }
+    closedir(dirp);
+}
+#endif /* ? NO_DIR */
+
+/* ========================================================================
+ * Free all dynamically allocated variables and exit with the given code.
+ */
+local void do_exit(exitcode)
+    int exitcode;
+{
+    if (env != NULL)  free(env),  env  = NULL;
+    if (args != NULL) free((char*)args), args = NULL;
+    FREE(inbuf);
+    FREE(outbuf);
+    FREE(d_buf);
+    FREE(window);
+#ifndef MAXSEG_64K
+    FREE(tab_prefix);
+#else
+    FREE(tab_prefix0);
+    FREE(tab_prefix1);
+#endif
+    exit(exitcode);
+}
+
+/* ========================================================================
+ * Signal and error handler.
+ */
+RETSIGTYPE abort_gzip()
+{
+   if (remove_ofname) {
+       close(ofd);
+       unlink (ofname);
+   }
+   do_exit(ERROR);
+}