X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gzip.c;h=9751c5e7cc121210be0909131b6924af82f1629d;hb=92249085071a973e2c0621b0415b93d2e48bb00d;hp=b45fc88fa442f927192568cee8ba442ad6453ef4;hpb=47dc1883f1f730f9576ae0e6090ead01732ff4ff;p=debian%2Fgzip diff --git a/gzip.c b/gzip.c index b45fc88..9751c5e 100644 --- a/gzip.c +++ b/gzip.c @@ -1,11 +1,12 @@ /* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface - Copyright (C) 1999, 2001, 2002, 2006, 2007 Free Software Foundation, Inc. + Copyright (C) 1999, 2001-2002, 2006-2007, 2009-2018 Free Software + Foundation, Inc. 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) + the Free Software Foundation; either version 3, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -27,11 +28,11 @@ * See the file algorithm.doc for the compression algorithms and file formats. */ -static char *license_msg[] = { -"Copyright (C) 2007 Free Software Foundation, Inc.", +static char const *const license_msg[] = { +"Copyright (C) 2018 Free Software Foundation, Inc.", "Copyright (C) 1993 Jean-loup Gailly.", "This is free software. You may redistribute copies of it under the terms of", -"the GNU General Public License .", +"the GNU General Public License .", "There is NO WARRANTY, to the extent permitted by law.", 0}; @@ -42,7 +43,7 @@ static char *license_msg[] = { * or stdout with -c option or if stdin used as input. * 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. + * On MSDOS, file.tmp -> file.tmz. * * Using gz on MSDOS would create too many file name conflicts. For * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for @@ -53,68 +54,51 @@ static char *license_msg[] = { * For the meaning of all compilation flags, see comments in Makefile.in. */ -#ifdef RCSID -static char rcsid[] = "$Id: gzip.c,v 1.16 2007/03/20 05:09:51 eggert Exp $"; -#endif - #include #include #include #include +#include +#include #include #include #include "tailor.h" #include "gzip.h" +#include "intprops.h" #include "lzw.h" #include "revision.h" +#include "timespec.h" -#include "fcntl-safer.h" +#include "dirname.h" +#include "dosname.h" +#include "fcntl--.h" #include "getopt.h" +#include "ignore-value.h" #include "stat-time.h" +#include "version.h" +#include "xalloc.h" +#include "yesno.h" - /* configuration */ - -#ifdef HAVE_FCNTL_H -# include -#endif - -#ifdef HAVE_LIMITS_H -# include -#endif - -#ifdef HAVE_UNISTD_H -# include -#endif + /* configuration */ -#if defined STDC_HEADERS || defined HAVE_STDLIB_H -# include -#else - extern int errno; -#endif +#include +#include +#include +#include #ifndef NO_DIR # define NO_DIR 0 #endif #if !NO_DIR # include -# ifndef _D_EXACT_NAMLEN -# define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name) -# endif -#endif - -#ifdef CLOSEDIR_VOID -# define CLOSEDIR(d) (closedir(d), 0) -#else -# define CLOSEDIR(d) closedir(d) +# include #endif #ifndef NO_UTIME # include #endif -#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */ - #ifndef MAX_PATH_LEN # define MAX_PATH_LEN 1024 /* max pathname length */ #endif @@ -128,36 +112,13 @@ static char rcsid[] = "$Id: gzip.c,v 1.16 2007/03/20 05:09:51 eggert Exp $"; #endif #ifdef off_t - off_t lseek OF((int fd, off_t offset, int whence)); -#endif - -#ifndef OFF_T_MIN -#define OFF_T_MIN (~ (off_t) 0 << (sizeof (off_t) * CHAR_BIT - 1)) -#endif - -#ifndef OFF_T_MAX -#define OFF_T_MAX (~ (off_t) 0 - OFF_T_MIN) -#endif - -/* Use SA_NOCLDSTOP as a proxy for whether the sigaction machinery is - present. */ -#ifndef SA_NOCLDSTOP -# define SA_NOCLDSTOP 0 -# define sigprocmask(how, set, oset) /* empty */ -# define sigset_t int -# if ! HAVE_SIGINTERRUPT -# define siginterrupt(sig, flag) /* empty */ -# endif + off_t lseek (int fd, off_t offset, int whence); #endif #ifndef HAVE_WORKING_O_NOFOLLOW # define HAVE_WORKING_O_NOFOLLOW 0 #endif -#ifndef ELOOP -# define ELOOP EINVAL -#endif - /* Separator for file name parts (see shorten_name()) */ #ifdef NO_MULTIPLE_DOTS # define PART_SEP "-" @@ -165,7 +126,7 @@ static char rcsid[] = "$Id: gzip.c,v 1.16 2007/03/20 05:09:51 eggert Exp $"; # define PART_SEP "." #endif - /* global buffers */ + /* global buffers */ DECLARE(uch, inbuf, INBUFSIZ +INBUF_EXTRA); DECLARE(uch, outbuf, OUTBUFSIZ+OUTBUF_EXTRA); @@ -178,35 +139,54 @@ DECLARE(uch, window, 2L*WSIZE); 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 no_name = -1; /* don't save or restore the original file name */ -int no_time = -1; /* don't save or restore the original file time */ -int recursive = 0; /* recurse through directories (-r) */ -int list = 0; /* list the file contents (-l) */ -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 = 0; /* set if program run in foreground */ -char *program_name; /* program name */ -int maxbits = BITS; /* max bits per code for LZW */ -int method = DEFLATED;/* compression method */ -int level = 6; /* 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 */ -struct timespec time_stamp; /* original time stamp (modification time) */ -off_t 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; /* default suffix (can be set with --suffix) */ -size_t z_len; /* strlen(z_suffix) */ + /* local variables */ + +/* If true, pretend that standard input is a tty. This option + is deliberately not documented, and only for testing. */ +static bool presume_input_tty; + +/* If true, transfer output data to the output file's storage device + when supported. Otherwise, if the system crashes around the time + gzip is run, the user might lose both input and output data. See: + Pillai TS et al. All file systems are not created equal: on the + complexity of crafting crash-consistent applications. OSDI'14. 2014:433-48. + https://www.usenix.org/conference/osdi14/technical-sessions/presentation/pillai */ +static bool synchronous; + +static int ascii = 0; /* convert end-of-lines to local OS conventions */ + int to_stdout = 0; /* output to stdout (-c) */ +static int decompress = 0; /* decompress (-d) */ +static int force = 0; /* don't ask questions, compress links (-f) */ +static int keep = 0; /* keep (don't delete) input files */ +static int no_name = -1; /* don't save or restore the original file name */ +static int no_time = -1; /* don't save or restore the original file time */ +static int recursive = 0; /* recurse through directories (-r) */ +static int list = 0; /* list the file contents (-l) */ + int verbose = 0; /* be verbose (-v) */ + int quiet = 0; /* be very quiet (-q) */ +static int do_lzw = 0; /* generate output compatible with old compress (-Z) */ + int test = 0; /* test .gz file integrity */ +static int foreground = 0; /* set if program run in foreground */ + char *program_name; /* program name */ + int maxbits = BITS; /* max bits per code for LZW */ + int method = DEFLATED;/* compression method */ + int level = 6; /* compression level */ + int exit_code = OK; /* program exit code */ + int save_orig_name; /* set if original name must be saved */ +static int last_member; /* set for .zip and .Z files */ +static int part_nb; /* number of parts in .gz file */ + off_t ifile_size; /* input file size, -1 for devices (debug only) */ +static char *env; /* contents of GZIP env variable */ +static char const *z_suffix; /* default suffix (can be set with --suffix) */ +static size_t z_len; /* strlen(z_suffix) */ + +/* The original timestamp (modification time). If the original is + unknown, TIME_STAMP.tv_nsec is negative. If the original is + greater than struct timespec range, TIME_STAMP is the maximal + struct timespec value; this can happen on hosts with 32-bit signed + time_t because the gzip format's MTIME is 32-bit unsigned. + The original cannot be less than struct timespec range. */ +struct timespec time_stamp; /* The set of signals that are caught. */ static sigset_t caught_signals; @@ -216,18 +196,24 @@ static sigset_t caught_signals; suppresses a "Broken Pipe" message with some shells. */ static int volatile exiting_signal; -/* If nonnegative, close this file descriptor and unlink ofname on error. */ +/* If nonnegative, close this file descriptor and unlink remove_ofname + on error. */ static int volatile remove_ofname_fd = -1; +static char volatile remove_ofname[MAX_PATH_LEN]; + +static bool stdin_was_read; off_t bytes_in; /* number of input bytes */ off_t bytes_out; /* number of output bytes */ -off_t total_in; /* input bytes for all files */ -off_t total_out; /* output bytes for all files */ +static off_t total_in; /* input bytes for all files */ +static off_t total_out; /* output bytes for all files */ char ifname[MAX_PATH_LEN]; /* input file name */ char ofname[MAX_PATH_LEN]; /* output file name */ -struct stat istat; /* status for input file */ +static char dfname[MAX_PATH_LEN]; /* name of dir containing output file */ +static struct stat istat; /* status for input file */ int ifd; /* input file descriptor */ int ofd; /* output file descriptor */ +static int dfd = -1; /* output directory 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 */ @@ -241,10 +227,8 @@ static int handled_sig[] = #ifdef SIGHUP , SIGHUP #endif -#ifdef SIGPIPE +#if SIGPIPE , SIGPIPE -#else -# define SIGPIPE 0 #endif #ifdef SIGTERM , SIGTERM @@ -257,7 +241,22 @@ static int handled_sig[] = #endif }; -struct option longopts[] = +/* For long options that have no equivalent short option, use a + non-character as a pseudo short option, starting with CHAR_MAX + 1. */ +enum +{ + PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1, + RSYNCABLE_OPTION, + SYNCHRONOUS_OPTION, + + /* A value greater than all valid long options, used as a flag to + distinguish options derived from the GZIP environment variable. */ + ENV_OPTION +}; + +static char const shortopts[] = "ab:cdfhH?klLmMnNqrS:tvVZ123456789"; + +static const struct option longopts[] = { /* { name has_arg *flag val } */ {"ascii", 0, 0, 'a'}, /* ascii text mode */ @@ -269,53 +268,57 @@ struct option longopts[] = {"force", 0, 0, 'f'}, /* force overwrite of output file */ {"help", 0, 0, 'h'}, /* give help */ /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */ + {"keep", 0, 0, 'k'}, /* keep (don't delete) input files */ {"list", 0, 0, 'l'}, /* list .gz file contents */ {"license", 0, 0, 'L'}, /* display software license */ {"no-name", 0, 0, 'n'}, /* don't save or restore original name & time */ {"name", 0, 0, 'N'}, /* save or restore original name & time */ + {"-presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION}, {"quiet", 0, 0, 'q'}, /* quiet mode */ {"silent", 0, 0, 'q'}, /* quiet mode */ + {"synchronous",0, 0, SYNCHRONOUS_OPTION}, {"recursive", 0, 0, 'r'}, /* recurse through directories */ {"suffix", 1, 0, 'S'}, /* use given suffix instead of .gz */ {"test", 0, 0, 't'}, /* test compressed file integrity */ - {"no-time", 0, 0, 'T'}, /* don't save or restore the time stamp */ {"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) */ - {"rsyncable", 0, 0, 'R'}, /* make rsync-friendly archive */ + {"rsyncable", 0, 0, RSYNCABLE_OPTION}, /* make rsync-friendly archive */ { 0, 0, 0, 0 } }; /* local functions */ -local void try_help OF((void)) ATTRIBUTE_NORETURN; -local void help OF((void)); -local void license OF((void)); -local void version OF((void)); -local int input_eof OF((void)); -local void treat_stdin OF((void)); -local void treat_file OF((char *iname)); -local int create_outfile OF((void)); -local char *get_suffix OF((char *name)); -local int open_input_file OF((char *iname, struct stat *sbuf)); -local int make_ofname OF((void)); -local void shorten_name OF((char *name)); -local int get_method OF((int in)); -local void do_list OF((int ifd, int method)); -local int check_ofname OF((void)); -local void copy_stat OF((struct stat *ifstat)); -local void install_signal_handlers OF((void)); -local void remove_output_file OF((void)); -local RETSIGTYPE abort_gzip_signal OF((int)); -local void do_exit OF((int exitcode)) ATTRIBUTE_NORETURN; - int main OF((int argc, char **argv)); -int (*work) OF((int infile, int outfile)) = zip; /* function to call */ +local noreturn void try_help (void); +local void help (void); +local void license (void); +local void version (void); +local int input_eof (void); +local void treat_stdin (void); +local void treat_file (char *iname); +local int create_outfile (void); +local char *get_suffix (char *name); +local int open_input_file (char *iname, struct stat *sbuf); +local void discard_input_bytes (size_t nbytes, unsigned int flags); +local int make_ofname (void); +local void shorten_name (char *name); +local int get_method (int in); +local void do_list (int ifd, int method); +local int check_ofname (void); +local void copy_stat (struct stat *ifstat); +local void install_signal_handlers (void); +static void remove_output_file (bool); +static void abort_gzip_signal (int); +local noreturn void do_exit (int exitcode); +static void finish_out (void); + int main (int argc, char **argv); +static int (*work) (int infile, int outfile) = zip; /* function to call */ #if ! NO_DIR -local void treat_dir OF((int fd, char *dir)); +local void treat_dir (int fd, char *dir); #endif #define strequ(s1, s2) (strcmp((s1),(s2)) == 0) @@ -324,14 +327,14 @@ static void try_help () { fprintf (stderr, "Try `%s --help' for more information.\n", - program_name); + program_name); do_exit (ERROR); } /* ======================================================================== */ local void help() { - static char *help_msg[] = { + static char const* const help_msg[] = { "Compress or uncompress FILEs (by default, compress FILES in-place).", "", "Mandatory arguments to long options are mandatory for short options too.", @@ -345,19 +348,22 @@ local void help() " -f, --force force overwrite of output file and compress links", " -h, --help give this help", /* -k, --pkzip force output in pkzip format */ + " -k, --keep keep (don't delete) input files", " -l, --list list compressed file contents", " -L, --license display software license", #ifdef UNDOCUMENTED - " -m, --no-time do not save or restore the original modification time", + " -m do not save or restore the original modification time", " -M, --time save or restore the original modification time", #endif - " -n, --no-name do not save or restore the original name and time stamp", - " -N, --name save or restore the original name and time stamp", + " -n, --no-name do not save or restore the original name and timestamp", + " -N, --name save or restore the original name and timestamp", " -q, --quiet suppress all warnings", #if ! NO_DIR " -r, --recursive operate recursively on directories", #endif + " --rsyncable make rsync-friendly archive", " -S, --suffix=SUF use suffix SUF on compressed files", + " --synchronous synchronous output (safer if system crashes, but slower)", " -t, --test test compressed file integrity", " -v, --verbose verbose mode", " -V, --version display version number", @@ -367,13 +373,12 @@ local void help() " -Z, --lzw produce output compatible with old compress", " -b, --bits=BITS max number of bits per code (implies -Z)", #endif - " --rsyncable Make rsync-friendly archive", "", "With no FILE, or when FILE is -, read standard input.", "", "Report bugs to .", 0}; - char **p = help_msg; + char const *const *p = help_msg; printf ("Usage: %s [OPTION]... [FILE]...\n", program_name); while (*p) printf ("%s\n", *p++); @@ -382,9 +387,9 @@ local void help() /* ======================================================================== */ local void license() { - char **p = license_msg; + char const *const *p = license_msg; - printf ("%s %s\n", program_name, VERSION); + printf ("%s %s\n", program_name, Version); while (*p) printf ("%s\n", *p++); } @@ -396,8 +401,7 @@ local void version() printf ("Written by Jean-loup Gailly.\n"); } -local void progerror (string) - char *string; +local void progerror (char const *string) { int e = errno; fprintf (stderr, "%s: ", program_name); @@ -407,26 +411,27 @@ local void progerror (string) } /* ======================================================================== */ -int main (argc, argv) - int argc; - char **argv; +int main (int argc, char **argv) { int file_count; /* number of files to process */ size_t proglen; /* length of program_name */ - int optc; /* current option */ + char **argv_copy; + int env_argc; + char **env_argv; EXPAND(argc, argv); /* wild card expansion if necessary */ program_name = gzip_base_name (argv[0]); proglen = strlen (program_name); - /* Suppress .exe for MSDOS, OS/2 and VMS: */ + /* Suppress .exe for MSDOS and OS/2: */ if (4 < proglen && strequ (program_name + proglen - 4, ".exe")) program_name[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; + argv_copy = argv; + env = add_envopt (&env_argc, &argv_copy, OPTIONS_VAR); + env_argv = env ? argv_copy : NULL; #ifndef GNU_STANDARD # define GNU_STANDARD 1 @@ -437,98 +442,173 @@ int main (argc, argv) * 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. + * Ignore an .exe extension for MSDOS and OS/2. */ if (strncmp (program_name, "un", 2) == 0 /* ungzip, uncompress */ - || strncmp (program_name, "gun", 3) == 0) /* gunzip */ - decompress = 1; + || strncmp (program_name, "gun", 3) == 0) /* gunzip */ + decompress = 1; else if (strequ (program_name + 1, "cat") /* zcat, pcat, gcat */ - || strequ (program_name, "gzcat")) /* gzcat */ - decompress = to_stdout = 1; + || strequ (program_name, "gzcat")) /* gzcat */ + decompress = to_stdout = 1; #endif z_suffix = Z_SUFFIX; z_len = strlen(z_suffix); - while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789", - longopts, (int *)0)) != -1) { - switch (optc) { + while (true) { + int optc; + int longind = -1; + + if (env_argv) + { + if (env_argv[optind] && strequ (env_argv[optind], "--")) + optc = ENV_OPTION + '-'; + else + { + optc = getopt_long (env_argc, env_argv, shortopts, longopts, + &longind); + if (0 <= optc) + optc += ENV_OPTION; + else + { + if (optind != env_argc) + { + fprintf (stderr, + ("%s: %s: non-option in "OPTIONS_VAR + " environment variable\n"), + program_name, env_argv[optind]); + try_help (); + } + + /* Wait until here before warning, so that GZIP='-q' + doesn't warn. */ + if (env_argc != 1 && !quiet) + fprintf (stderr, + ("%s: warning: "OPTIONS_VAR" environment variable" + " is deprecated; use an alias or script\n"), + program_name); + + /* Start processing ARGC and ARGV instead. */ + free (env_argv); + env_argv = NULL; + optind = 1; + longind = -1; + } + } + } + + if (!env_argv) + optc = getopt_long (argc, argv, shortopts, longopts, &longind); + if (optc < 0) + break; + + switch (optc) { case 'a': ascii = 1; break; - case 'b': - maxbits = atoi(optarg); - for (; *optarg; optarg++) - if (! ('0' <= *optarg && *optarg <= '9')) - { - fprintf (stderr, "%s: -b operand is not an integer\n", - program_name); - try_help (); - } - break; - case 'c': - to_stdout = 1; break; - case 'd': - decompress = 1; break; - case 'f': - force++; break; - case 'h': case 'H': - help(); do_exit(OK); break; - case 'l': - list = decompress = to_stdout = 1; break; - case 'L': - license(); do_exit(OK); break; - case 'm': /* undocumented, may change later */ - no_time = 1; break; - case 'M': /* undocumented, may change later */ - no_time = 0; break; - case 'n': - no_name = no_time = 1; break; - case 'N': - no_name = no_time = 0; break; - case 'q': - quiet = 1; verbose = 0; break; - case 'r': + case 'b': + maxbits = atoi(optarg); + for (; *optarg; optarg++) + if (! ('0' <= *optarg && *optarg <= '9')) + { + fprintf (stderr, "%s: -b operand is not an integer\n", + program_name); + try_help (); + } + break; + case 'c': + to_stdout = 1; break; + case 'd': + decompress = 1; break; + case 'f': + force++; break; + case 'h': case 'H': + help (); finish_out (); break; + case 'k': + keep = 1; break; + case 'l': + list = decompress = to_stdout = 1; break; + case 'L': + license (); finish_out (); break; + case 'm': /* undocumented, may change later */ + no_time = 1; break; + case 'M': /* undocumented, may change later */ + no_time = 0; break; + case 'n': + case 'n' + ENV_OPTION: + no_name = no_time = 1; break; + case 'N': + case 'N' + ENV_OPTION: + no_name = no_time = 0; break; + case PRESUME_INPUT_TTY_OPTION: + presume_input_tty = true; break; + case 'q': + case 'q' + ENV_OPTION: + quiet = 1; verbose = 0; break; + case 'r': #if NO_DIR - fprintf (stderr, "%s: -r not supported on this system\n", - program_name); - try_help (); + fprintf (stderr, "%s: -r not supported on this system\n", + program_name); + try_help (); #else - recursive = 1; + recursive = 1; #endif - case 'R': - rsync = 1; break; + break; - case 'S': + case RSYNCABLE_OPTION: + case RSYNCABLE_OPTION + ENV_OPTION: + rsync = 1; + break; + case 'S': #ifdef NO_MULTIPLE_DOTS if (*optarg == '.') optarg++; #endif z_len = strlen(optarg); - z_suffix = optarg; + z_suffix = optarg; + break; + case SYNCHRONOUS_OPTION: + synchronous = true; + break; + case 't': + test = decompress = to_stdout = 1; break; - case 't': - test = decompress = to_stdout = 1; - break; - case 'v': - verbose++; quiet = 0; break; - case 'V': - version(); do_exit(OK); break; - case 'Z': + case 'v': + case 'v' + ENV_OPTION: + verbose++; quiet = 0; break; + case 'V': + version (); finish_out (); break; + case 'Z': #ifdef LZW - do_lzw = 1; break; + do_lzw = 1; break; #else - fprintf(stderr, "%s: -Z not supported in this version\n", - program_name); - try_help (); - break; + fprintf(stderr, "%s: -Z not supported in this version\n", + program_name); + try_help (); + 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. */ - try_help (); - } + case '1' + ENV_OPTION: case '2' + ENV_OPTION: case '3' + ENV_OPTION: + case '4' + ENV_OPTION: case '5' + ENV_OPTION: case '6' + ENV_OPTION: + case '7' + ENV_OPTION: case '8' + ENV_OPTION: case '9' + ENV_OPTION: + optc -= ENV_OPTION; + FALLTHROUGH; + case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + level = optc - '0'; + break; + + default: + if (ENV_OPTION <= optc && optc != ENV_OPTION + '?') + { + /* Output a diagnostic, since getopt_long didn't. */ + fprintf (stderr, "%s: ", program_name); + if (longind < 0) + fprintf (stderr, "-%c: ", optc - ENV_OPTION); + else + fprintf (stderr, "--%s: ", longopts[longind].name); + fprintf (stderr, ("option not valid in "OPTIONS_VAR + " environment variable\n")); + } + try_help (); + } } /* loop on all arguments */ /* By default, save name and timestamp on compression but do not @@ -542,15 +622,15 @@ int main (argc, argv) #if O_BINARY #else if (ascii && !quiet) { - fprintf(stderr, "%s: option --ascii ignored on this system\n", - program_name); + fprintf(stderr, "%s: option --ascii ignored on this system\n", + program_name); } #endif - if ((z_len == 0 && !decompress) || z_len > MAX_SUFFIX) { - fprintf(stderr, "%s: incorrect suffix '%s'\n", - program_name, z_suffix); + if (z_len == 0 || z_len > MAX_SUFFIX) { + fprintf(stderr, "%s: invalid suffix '%s'\n", program_name, z_suffix); do_exit(ERROR); } + if (do_lzw && !decompress) work = lzw; /* Allocate all global buffers (for DYN_ALLOC option) */ @@ -570,20 +650,35 @@ int main (argc, argv) /* And get to work */ if (file_count != 0) { - if (to_stdout && !test && !list && (!decompress || !ascii)) { - SET_BINARY_MODE(fileno(stdout)); - } + if (to_stdout && !test && !list && (!decompress || !ascii)) { + SET_BINARY_MODE (STDOUT_FILENO); + } while (optind < argc) { - treat_file(argv[optind++]); - } + treat_file(argv[optind++]); + } } else { /* Standard input */ - treat_stdin(); - } - if (list && !quiet && file_count > 1) { - do_list(-1, -1); /* print totals */ + treat_stdin(); } + if (stdin_was_read && close (STDIN_FILENO) != 0) + { + strcpy (ifname, "stdin"); + read_error (); + } + if (list) + { + /* Output any totals, and check for output errors. */ + if (!quiet && 1 < file_count) + do_list (-1, -1); + if (fflush (stdout) != 0) + write_error (); + } + if (to_stdout + && ((synchronous + && fdatasync (STDOUT_FILENO) != 0 && errno != EINVAL) + || close (STDOUT_FILENO) != 0) + && errno != EBADF) + write_error (); do_exit(exit_code); - return exit_code; /* just to avoid lint warning */ } /* Return nonzero when at end of file on input. */ @@ -596,7 +691,7 @@ input_eof () if (inptr == insize) { if (insize != INBUFSIZ || fill_inbuf (1) == EOF) - return 1; + return 1; /* Unget the char that fill_inbuf got. */ inptr = 0; @@ -605,62 +700,86 @@ input_eof () return 0; } +static void +get_input_size_and_time (void) +{ + ifile_size = -1; + time_stamp.tv_nsec = -1; + + /* Record the input file's size and timestamp only if it is a + regular file. Doing this for the timestamp helps to keep gzip's + output more reproducible when it is used as part of a + pipeline. */ + + if (S_ISREG (istat.st_mode)) + { + ifile_size = istat.st_size; + if (!no_time || list) + time_stamp = get_stat_mtime (&istat); + } +} + /* ======================================================================== * Compress or decompress stdin */ local void treat_stdin() { - if (!force && !list && - 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", - program_name, decompress ? "read from" : "written to", - decompress ? "de" : ""); - fprintf (stderr, "For help, type: %s -h\n", program_name); - do_exit(ERROR); + if (!force && !list + && (presume_input_tty + || isatty (decompress ? STDIN_FILENO : STDOUT_FILENO))) { + /* 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. + */ + if (! quiet) + fprintf (stderr, + ("%s: compressed data not %s a terminal." + " Use -f to force %scompression.\n" + "For help, type: %s -h\n"), + program_name, + decompress ? "read from" : "written to", + decompress ? "de" : "", + program_name); + do_exit(ERROR); } if (decompress || !ascii) { - SET_BINARY_MODE(fileno(stdin)); + SET_BINARY_MODE (STDIN_FILENO); } if (!test && !list && (!decompress || !ascii)) { - SET_BINARY_MODE(fileno(stdout)); + SET_BINARY_MODE (STDOUT_FILENO); } strcpy(ifname, "stdin"); strcpy(ofname, "stdout"); - /* Get the file's time stamp and size. */ - if (fstat (fileno (stdin), &istat) != 0) + /* Get the file's timestamp and size. */ + if (fstat (STDIN_FILENO, &istat) != 0) { - progerror ("standard input"); - do_exit (ERROR); + progerror ("standard input"); + do_exit (ERROR); } - ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1; - time_stamp.tv_nsec = -1; - if (!no_time || list) - time_stamp = get_stat_mtime (&istat); + + get_input_size_and_time (); clear_bufs(); /* clear input and output buffers */ to_stdout = 1; part_nb = 0; + ifd = STDIN_FILENO; + stdin_was_read = true; if (decompress) { - method = get_method(ifd); - if (method < 0) { - do_exit(exit_code); /* error message already emitted */ - } + method = get_method(ifd); + if (method < 0) { + do_exit(exit_code); /* error message already emitted */ + } } if (list) { do_list(ifd, method); @@ -670,30 +789,73 @@ local void treat_stdin() /* Actually do the compression/decompression. Loop over zipped members. */ for (;;) { - if ((*work)(fileno(stdin), fileno(stdout)) != OK) return; + if (work (STDIN_FILENO, STDOUT_FILENO) != OK) + return; - if (input_eof ()) - break; + if (input_eof ()) + break; - method = get_method(ifd); - if (method < 0) return; /* error message already emitted */ - bytes_out = 0; /* required for length check */ + 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\n"); + if (test) { + fprintf(stderr, " OK\n"); - } else if (!decompress) { - display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr); - fprintf(stderr, "\n"); + } else if (!decompress) { + display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr); + fprintf(stderr, "\n"); #ifdef DISPLAY_STDIN_RATIO - } else { - display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr); - fprintf(stderr, "\n"); + } else { + display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr); + fprintf(stderr, "\n"); #endif - } + } + } +} + +static char const dot = '.'; + +/* True if the cached directory for calls to openat etc. is DIR, with + length DIRLEN. DIR need not be null-terminated. DIRLEN must be + less than MAX_PATH_LEN. */ +static bool +atdir_eq (char const *dir, ptrdiff_t dirlen) +{ + if (dirlen == 0) + dir = &dot, dirlen = 1; + return memcmp (dfname, dir, dirlen) == 0 && !dfname[dirlen]; +} + +/* Set the directory used for calls to openat etc. to be the directory + DIR, with length DIRLEN. DIR need not be null-terminated. + DIRLEN must be less than MAX_PATH_LEN. Return a file descriptor for + the directory, or -1 if one could not be obtained. */ +static int +atdir_set (char const *dir, ptrdiff_t dirlen) +{ + /* Don't bother opening directories on older systems that + lack openat and unlinkat. It's not worth the porting hassle. */ + #if HAVE_OPENAT && HAVE_UNLINKAT + enum { try_opening_directories = true }; + #else + enum { try_opening_directories = false }; + #endif + + if (try_opening_directories && ! atdir_eq (dir, dirlen)) + { + if (0 <= dfd) + close (dfd); + if (dirlen == 0) + dir = &dot, dirlen = 1; + memcpy (dfname, dir, dirlen); + dfname[dirlen] = '\0'; + dfd = open (dfname, O_SEARCH | O_DIRECTORY); } + + return dfd; } /* ======================================================================== @@ -704,10 +866,10 @@ local void treat_file(iname) { /* Accept "-" as synonym for stdin */ if (strequ(iname, "-")) { - int cflag = to_stdout; - treat_stdin(); - to_stdout = cflag; - return; + int cflag = to_stdout; + treat_stdin(); + to_stdout = cflag; + return; } /* Check if the input file is present, set ifname and istat: */ @@ -718,95 +880,92 @@ local void treat_file(iname) /* If the input name is that of a directory, recurse or ignore: */ if (S_ISDIR(istat.st_mode)) { #if ! NO_DIR - if (recursive) { - treat_dir (ifd, iname); - /* Warning: ifname is now garbage */ - return; - } + if (recursive) { + treat_dir (ifd, iname); + /* Warning: ifname is now garbage */ + return; + } #endif - close (ifd); - WARN ((stderr, "%s: %s is a directory -- ignored\n", - program_name, ifname)); - return; + close (ifd); + WARN ((stderr, "%s: %s is a directory -- ignored\n", + program_name, ifname)); + return; } if (! to_stdout) { - if (! S_ISREG (istat.st_mode)) - { - WARN ((stderr, - "%s: %s is not a directory or a regular file - ignored\n", - program_name, ifname)); - close (ifd); - return; - } - if (istat.st_mode & S_ISUID) - { - WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n", - program_name, ifname)); - close (ifd); - return; - } - if (istat.st_mode & S_ISGID) - { - WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n", - program_name, ifname)); - close (ifd); - return; - } - - if (! force) - { - if (istat.st_mode & S_ISVTX) - { - WARN ((stderr, - "%s: %s has the sticky bit set - file ignored\n", - program_name, ifname)); - close (ifd); - return; - } - if (2 <= istat.st_nlink) - { - WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n", - program_name, ifname, - (unsigned long int) istat.st_nlink - 1, - istat.st_nlink == 2 ? ' ' : 's')); - close (ifd); - return; - } - } + if (! S_ISREG (istat.st_mode)) + { + WARN ((stderr, + "%s: %s is not a directory or a regular file - ignored\n", + program_name, ifname)); + close (ifd); + return; + } + if (istat.st_mode & S_ISUID) + { + WARN ((stderr, "%s: %s is set-user-ID on execution - ignored\n", + program_name, ifname)); + close (ifd); + return; + } + if (istat.st_mode & S_ISGID) + { + WARN ((stderr, "%s: %s is set-group-ID on execution - ignored\n", + program_name, ifname)); + close (ifd); + return; + } + + if (! force) + { + if (istat.st_mode & S_ISVTX) + { + WARN ((stderr, + "%s: %s has the sticky bit set - file ignored\n", + program_name, ifname)); + close (ifd); + return; + } + if (2 <= istat.st_nlink) + { + WARN ((stderr, "%s: %s has %lu other link%c -- unchanged\n", + program_name, ifname, + (unsigned long int) istat.st_nlink - 1, + istat.st_nlink == 2 ? ' ' : 's')); + close (ifd); + return; + } + } } - ifile_size = S_ISREG (istat.st_mode) ? istat.st_size : -1; - time_stamp.tv_nsec = -1; - if (!no_time || list) - time_stamp = get_stat_mtime (&istat); + get_input_size_and_time (); /* Generate output file name. For -r and (-t or -l), skip files * without a valid gzip suffix (check done in make_ofname). */ if (to_stdout && !list && !test) { - strcpy(ofname, "stdout"); + strcpy(ofname, "stdout"); } else if (make_ofname() != OK) { - close (ifd); - return; + close (ifd); + 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 */ - } + method = get_method(ifd); /* updates ofname if original given */ + if (method < 0) { + close(ifd); + return; /* error message already emitted */ + } } if (list) { do_list(ifd, method); if (close (ifd) != 0) - read_error (); + read_error (); return; } @@ -815,37 +974,37 @@ local void treat_file(iname) * a new ofname and save the original name in the compressed file. */ if (to_stdout) { - ofd = fileno(stdout); - /* Keep remove_ofname_fd negative. */ + ofd = STDOUT_FILENO; + /* Keep remove_ofname_fd negative. */ } else { - if (create_outfile() != OK) return; + if (create_outfile() != OK) return; - if (!decompress && save_orig_name && !verbose && !quiet) { - fprintf(stderr, "%s: %s compressed to %s\n", - program_name, ifname, ofname); - } + if (!decompress && save_orig_name && !verbose && !quiet) { + fprintf(stderr, "%s: %s compressed to %s\n", + program_name, ifname, ofname); + } } /* Keep the name even if not truncated except with --no-name: */ if (!save_orig_name) save_orig_name = !no_name; if (verbose) { - fprintf(stderr, "%s:\t", ifname); + fprintf(stderr, "%s:\t", ifname); } /* Actually do the compression/decompression. Loop over zipped members. */ for (;;) { - if ((*work)(ifd, ofd) != OK) { - method = -1; /* force cleanup */ - break; - } + if ((*work)(ifd, ofd) != OK) { + method = -1; /* force cleanup */ + break; + } - if (input_eof ()) - break; + if (input_eof ()) + break; - method = get_method(ifd); - if (method < 0) break; /* error message already emitted */ - bytes_out = 0; /* required for length check */ + method = get_method(ifd); + if (method < 0) break; /* error message already emitted */ + bytes_out = 0; /* required for length check */ } if (close (ifd) != 0) @@ -853,51 +1012,69 @@ local void treat_file(iname) if (!to_stdout) { - sigset_t oldset; - int unlink_errno; - - copy_stat (&istat); - if (close (ofd) != 0) - write_error (); - - sigprocmask (SIG_BLOCK, &caught_signals, &oldset); - remove_ofname_fd = -1; - unlink_errno = xunlink (ifname) == 0 ? 0 : errno; - sigprocmask (SIG_SETMASK, &oldset, NULL); - - if (unlink_errno) - { - WARN ((stderr, "%s: ", program_name)); - if (!quiet) - { - errno = unlink_errno; - perror (ifname); - } - } + copy_stat (&istat); + + if ((synchronous + && ((0 <= dfd && fdatasync (dfd) != 0 && errno != EINVAL) + || (fsync (ofd) != 0 && errno != EINVAL))) + || close (ofd) != 0) + write_error (); + + if (!keep) + { + sigset_t oldset; + int unlink_errno; + char *ifbase = last_component (ifname); + int ufd = atdir_eq (ifname, ifbase - ifname) ? dfd : -1; + int res; + + sigprocmask (SIG_BLOCK, &caught_signals, &oldset); + remove_ofname_fd = -1; + res = ufd < 0 ? xunlink (ifname) : unlinkat (ufd, ifbase, 0); + unlink_errno = res == 0 ? 0 : errno; + sigprocmask (SIG_SETMASK, &oldset, NULL); + + if (unlink_errno) + { + WARN ((stderr, "%s: ", program_name)); + if (!quiet) + { + errno = unlink_errno; + perror (ifname); + } + } + } } if (method == -1) { - if (!to_stdout) - remove_output_file (); - return; + if (!to_stdout) + remove_output_file (false); + return; } /* Display statistics */ if(verbose) { - if (test) { - fprintf(stderr, " OK"); - } else if (decompress) { - display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr); - } else { - display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr); - } - if (!test && !to_stdout) { - fprintf(stderr, " -- replaced with %s", ofname); - } - fprintf(stderr, "\n"); + if (test) { + fprintf(stderr, " OK"); + } else if (decompress) { + display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out,stderr); + } else { + display_ratio(bytes_in-(bytes_out-header_bytes), bytes_in, stderr); + } + if (!test && !to_stdout) + fprintf(stderr, " -- %s %s", keep ? "created" : "replaced with", + ofname); + fprintf(stderr, "\n"); } } +static void +volatile_strcpy (char volatile *dst, char const volatile *src) +{ + while ((*dst++ = *src++)) + continue; +} + /* ======================================================================== * Create the output file. Return OK or ERROR. * Try several times if necessary to avoid truncating the z_suffix. For @@ -911,50 +1088,65 @@ local int create_outfile() { int name_shortened = 0; int flags = (O_WRONLY | O_CREAT | O_EXCL - | (ascii && decompress ? 0 : O_BINARY)); + | (ascii && decompress ? 0 : O_BINARY)); + char const *base = ofname; + int atfd = AT_FDCWD; + + if (!keep) + { + char const *b = last_component (ofname); + int f = atdir_set (ofname, b - ofname); + if (0 <= f) + { + base = b; + atfd = f; + } + } for (;;) { int open_errno; sigset_t oldset; + volatile_strcpy (remove_ofname, ofname); + sigprocmask (SIG_BLOCK, &caught_signals, &oldset); - remove_ofname_fd = ofd = OPEN (ofname, flags, RW_USER); + remove_ofname_fd = ofd = openat (atfd, base, flags, S_IRUSR | S_IWUSR); open_errno = errno; sigprocmask (SIG_SETMASK, &oldset, NULL); if (0 <= ofd) - break; + break; switch (open_errno) - { + { #ifdef ENAMETOOLONG - case ENAMETOOLONG: - shorten_name (ofname); - name_shortened = 1; - break; + case ENAMETOOLONG: + shorten_name (ofname); + name_shortened = 1; + break; #endif - case EEXIST: - if (check_ofname () != OK) - { - close (ifd); - return ERROR; - } - break; - - default: - progerror (ofname); - close (ifd); - return ERROR; - } + case EEXIST: + if (check_ofname () != OK) + { + close (ifd); + return ERROR; + } + break; + + default: + progerror (ofname); + close (ifd); + return ERROR; + } } if (name_shortened && decompress) { /* name might be too long if an original name was saved */ WARN ((stderr, "%s: %s: warning, name truncated\n", - program_name, ofname)); + program_name, ofname)); } return OK; @@ -969,32 +1161,40 @@ local int create_outfile() * 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. - * On systems allowing multiple versions of the same file (such as VMS), - * this function removes any version suffix in the given name. */ 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[] = + static char const *known_suffixes[] = {NULL, ".gz", ".z", ".taz", ".tgz", "-gz", "-z", "_z", #ifdef MAX_EXT_CHARS "z", #endif - NULL}; - char **suf = known_suffixes; + NULL, NULL}; + char const **suf; + bool suffix_of_builtin = false; - *suf = z_suffix; - if (strequ(z_suffix, "z")) suf++; /* check long suffixes first */ + /* Normally put Z_SUFFIX at the start of KNOWN_SUFFIXES, but if it + is a suffix of one of them, put it at the end. */ + for (suf = known_suffixes + 1; *suf; suf++) + { + size_t suflen = strlen (*suf); + if (z_len < suflen && strequ (z_suffix, *suf + suflen - z_len)) + { + suffix_of_builtin = true; + break; + } + } + + char *z_lower = xstrdup(z_suffix); + strlwr(z_lower); + known_suffixes[suffix_of_builtin + ? sizeof known_suffixes / sizeof *known_suffixes - 2 + : 0] = z_lower; + suf = known_suffixes + suffix_of_builtin; -#ifdef SUFFIX_SEP - /* strip a version number from the file name */ - { - char *v = strrchr(name, SUFFIX_SEP); - if (v != NULL) *v = '\0'; - } -#endif nlen = strlen(name); if (nlen <= MAX_SUFFIX+2) { strcpy(suffix, name); @@ -1003,46 +1203,62 @@ local char *get_suffix(name) } strlwr(suffix); slen = strlen(suffix); + char *match = NULL; do { int s = strlen(*suf); - if (slen > s && suffix[slen-s-1] != PATH_SEP + if (slen > s && ! ISSLASH (suffix[slen - s - 1]) && strequ(suffix + slen - s, *suf)) { - return name+nlen-s; + match = name+nlen-s; + break; } } while (*++suf != NULL); + free(z_lower); - return NULL; + return match; } -/* Open file NAME with the given flags and mode and store its status +/* Open file NAME with the given flags and store its status into *ST. Return a file descriptor to the newly opened file, or -1 (setting errno) on failure. */ static int -open_and_stat (char *name, int flags, mode_t mode, struct stat *st) +open_and_stat (char *name, int flags, struct stat *st) { int fd; + int atfd = AT_FDCWD; + char const *base = name; /* Refuse to follow symbolic links unless -c or -f. */ if (!to_stdout && !force) { if (HAVE_WORKING_O_NOFOLLOW) - flags |= O_NOFOLLOW; + flags |= O_NOFOLLOW; else - { -#if HAVE_LSTAT || defined lstat - if (lstat (name, st) != 0) - return -1; - else if (S_ISLNK (st->st_mode)) - { - errno = ELOOP; - return -1; - } + { +#ifdef S_ISLNK + if (lstat (name, st) != 0) + return -1; + else if (S_ISLNK (st->st_mode)) + { + errno = ELOOP; + return -1; + } #endif - } + } + } + + if (!keep) + { + char const *b = last_component (name); + int f = atdir_set (name, b - name); + if (0 <= f) + { + base = b; + atfd = f; + } } - fd = OPEN (name, flags, mode); + fd = openat (atfd, base, flags); if (0 <= fd && fstat (fd, st) != 0) { int e = errno; @@ -1068,39 +1284,37 @@ open_input_file (iname, sbuf) { int ilen; /* strlen(ifname) */ int z_suffix_errno = 0; - static char *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL}; - char **suf = suffixes; - char *s; + static char const *suffixes[] = {NULL, ".gz", ".z", "-z", ".Z", NULL}; + char const **suf = suffixes; + char const *s; #ifdef NO_MULTIPLE_DOTS char *dot; /* pointer to ifname extension, or NULL */ #endif int fd; int open_flags = (O_RDONLY | O_NONBLOCK | O_NOCTTY - | (ascii && !decompress ? 0 : O_BINARY)); + | (ascii && !decompress ? 0 : O_BINARY)); *suf = z_suffix; if (sizeof ifname - 1 <= strlen (iname)) - goto name_too_long; + goto name_too_long; strcpy(ifname, iname); /* If input file exists, return OK. */ - fd = open_and_stat (ifname, open_flags, RW_USER, sbuf); + fd = open_and_stat (ifname, open_flags, sbuf); if (0 <= fd) return fd; if (!decompress || errno != ENOENT) { - progerror(ifname); - return -1; + progerror(ifname); + return -1; } - /* file.ext doesn't exist, try adding a suffix (after removing any - * version number for VMS). - */ + /* File.ext doesn't exist. Try adding a suffix. */ s = get_suffix(ifname); if (s != NULL) { - progerror(ifname); /* ifname already has z suffix and does not exist */ - return -1; + progerror(ifname); /* ifname already has z suffix and does not exist */ + return -1; } #ifdef NO_MULTIPLE_DOTS dot = strrchr(ifname, '.'); @@ -1114,29 +1328,29 @@ open_input_file (iname, sbuf) /* Search for all suffixes */ do { - char *s0 = s = *suf; + char const *s0 = s = *suf; strcpy (ifname, iname); #ifdef NO_MULTIPLE_DOTS if (*s == '.') s++; if (*dot == '\0') strcpy (dot, "."); #endif #ifdef MAX_EXT_CHARS - if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1)) - dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0'; + if (MAX_EXT_CHARS < strlen (s) + strlen (dot + 1)) + dot[MAX_EXT_CHARS + 1 - strlen (s)] = '\0'; #endif - if (sizeof ifname <= ilen + strlen (s)) - goto name_too_long; + if (sizeof ifname <= ilen + strlen (s)) + goto name_too_long; strcat(ifname, s); - fd = open_and_stat (ifname, open_flags, RW_USER, sbuf); - if (0 <= fd) - return fd; - if (errno != ENOENT) - { - progerror (ifname); - return -1; - } - if (strequ (s0, z_suffix)) - z_suffix_errno = errno; + fd = open_and_stat (ifname, open_flags, sbuf); + if (0 <= fd) + return fd; + if (errno != ENOENT) + { + progerror (ifname); + return -1; + } + if (strequ (s0, z_suffix)) + z_suffix_errno = errno; } while (*++suf != NULL); /* No suffix found, complain using z_suffix: */ @@ -1172,52 +1386,52 @@ local int make_ofname() suff = get_suffix(ofname); if (decompress) { - if (suff == NULL) { - /* With -t or -l, try all files (even without .gz suffix) - * except with -r (behave as with just -dr). + if (suff == NULL) { + /* With -t or -l, try all files (even without .gz suffix) + * except with -r (behave as with just -dr). */ if (!recursive && (list || test)) return OK; - /* Avoid annoying messages with -r */ - if (verbose || (!recursive && !quiet)) { - WARN((stderr,"%s: %s: unknown suffix -- ignored\n", - program_name, 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 the z suffix */ - } + /* Avoid annoying messages with -r */ + if (verbose || (!recursive && !quiet)) { + WARN((stderr,"%s: %s: unknown suffix -- ignored\n", + program_name, 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 the z suffix */ + } /* 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)) { - /* Don't use WARN, as it affects exit status. */ - fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n", - program_name, ifname, suff); - } - return WARNING; + } else if (suff && ! force) { + /* Avoid annoying messages with -r (see treat_dir()) */ + if (verbose || (!recursive && !quiet)) { + /* Don't use WARN, as it affects exit status. */ + fprintf (stderr, "%s: %s already has %s suffix -- unchanged\n", + program_name, ifname, suff); + } + return WARNING; } else { save_orig_name = 0; #ifdef NO_MULTIPLE_DOTS - suff = strrchr(ofname, '.'); - if (suff == NULL) { - if (sizeof ofname <= strlen (ofname) + 1) - goto name_too_long; + suff = strrchr(ofname, '.'); + if (suff == NULL) { + if (sizeof ofname <= strlen (ofname) + 1) + goto name_too_long; strcat(ofname, "."); # ifdef MAX_EXT_CHARS - if (strequ(z_suffix, "z")) { - if (sizeof ofname <= strlen (ofname) + 2) - goto name_too_long; - strcat(ofname, "gz"); /* enough room */ - return OK; - } + if (strequ(z_suffix, "z")) { + if (sizeof ofname <= strlen (ofname) + 2) + goto name_too_long; + strcat(ofname, "gz"); /* enough room */ + return OK; + } /* On the Atari and some versions of MSDOS, * ENAMETOOLONG does not work correctly. So we * must truncate here. @@ -1228,9 +1442,9 @@ local int make_ofname() # endif } #endif /* NO_MULTIPLE_DOTS */ - if (sizeof ofname <= strlen (ofname) + z_len) - goto name_too_long; - strcat(ofname, z_suffix); + if (sizeof ofname <= strlen (ofname) + z_len) + goto name_too_long; + strcat(ofname, z_suffix); } /* decompress ? */ return OK; @@ -1240,13 +1454,32 @@ local int make_ofname() return WARNING; } +/* Discard NBYTES input bytes from the input, or up through the next + zero byte if NBYTES == (size_t) -1. If FLAGS say that the header + CRC should be computed, update the CRC accordingly. */ +static void +discard_input_bytes (nbytes, flags) + size_t nbytes; + unsigned int flags; +{ + while (nbytes != 0) + { + uch c = get_byte (); + if (flags & HEADER_CRC) + updcrc (&c, 1); + if (nbytes != (size_t) -1) + nbytes--; + else if (! c) + break; + } +} /* ======================================================================== * 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. - * Updates time_stamp if there is one and --no-time is not used. + * Updates time_stamp if there is one and neither -m nor -n is used. * 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. @@ -1256,186 +1489,228 @@ local int get_method(in) int in; /* input file descriptor */ { uch flags; /* compression flags */ - char magic[2]; /* magic header */ + uch magic[10]; /* magic header */ + int imagic0; /* first magic byte or EOF */ int imagic1; /* like magic[1], but can represent EOF */ - ulg stamp; /* time stamp */ + ulg stamp; /* timestamp */ /* If --force and --stdout, zcat == cat, so do not complain about * premature end of file: use try_byte instead of get_byte. */ if (force && to_stdout) { - magic[0] = (char)try_byte(); - imagic1 = try_byte (); - magic[1] = (char) imagic1; - /* If try_byte returned EOF, magic[1] == (char) EOF. */ + imagic0 = try_byte(); + magic[0] = imagic0; + imagic1 = try_byte (); + magic[1] = imagic1; + /* If try_byte returned EOF, magic[1] == (char) EOF. */ } else { - magic[0] = (char)get_byte(); - magic[1] = (char)get_byte(); - imagic1 = 0; /* avoid lint warning */ + magic[0] = get_byte (); + imagic0 = 0; + if (magic[0]) { + magic[1] = get_byte (); + imagic1 = 0; /* avoid lint warning */ + } else { + imagic1 = try_byte (); + magic[1] = imagic1; + } } method = -1; /* unknown yet */ part_nb++; /* number of parts in gzip file */ header_bytes = 0; - last_member = RECORD_IO; + last_member = 0; /* 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) { - method = (int)get_byte(); - if (method != DEFLATED) { - fprintf(stderr, - "%s: %s: unknown method %d -- not supported\n", - program_name, ifname, method); - exit_code = ERROR; - return -1; - } - work = unzip; - flags = (uch)get_byte(); - - if ((flags & ENCRYPTED) != 0) { - fprintf(stderr, - "%s: %s is encrypted -- not supported\n", - program_name, ifname); - exit_code = ERROR; - return -1; - } - if ((flags & CONTINUATION) != 0) { - fprintf(stderr, - "%s: %s is a multi-part gzip file -- not supported\n", - program_name, ifname); - exit_code = ERROR; - if (force <= 1) return -1; - } - if ((flags & RESERVED) != 0) { - fprintf(stderr, - "%s: %s has flags 0x%x -- not supported\n", - program_name, ifname, flags); - exit_code = ERROR; - if (force <= 1) return -1; - } - stamp = (ulg)get_byte(); - stamp |= ((ulg)get_byte()) << 8; - stamp |= ((ulg)get_byte()) << 16; - stamp |= ((ulg)get_byte()) << 24; - if (stamp != 0 && !no_time) - { - time_stamp.tv_sec = stamp; - time_stamp.tv_nsec = 0; - } - - (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", - program_name, 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", - program_name, ifname, len); - } - while (len--) (void)get_byte(); - } - - /* Get original file name if it was truncated */ - if ((flags & ORIG_NAME) != 0) { - if (no_name || (to_stdout && !list) || part_nb > 1) { - /* Discard the old name */ - char c; /* dummy used for NeXTstep 3.0 cc optimizer bug */ - do {c=get_byte();} while (c != 0); - } else { - /* Copy the base name. Keep a directory prefix intact. */ + method = (int)get_byte(); + if (method != DEFLATED) { + fprintf(stderr, + "%s: %s: unknown method %d -- not supported\n", + program_name, ifname, method); + exit_code = ERROR; + return -1; + } + work = unzip; + flags = (uch)get_byte(); + + if ((flags & ENCRYPTED) != 0) { + fprintf(stderr, + "%s: %s is encrypted -- not supported\n", + program_name, ifname); + exit_code = ERROR; + return -1; + } + if ((flags & RESERVED) != 0) { + fprintf(stderr, + "%s: %s has flags 0x%x -- not supported\n", + program_name, ifname, flags); + exit_code = ERROR; + if (force <= 1) return -1; + } + stamp = (ulg)get_byte(); + stamp |= ((ulg)get_byte()) << 8; + stamp |= ((ulg)get_byte()) << 16; + stamp |= ((ulg)get_byte()) << 24; + if (stamp != 0 && !no_time) + { + if (stamp <= TYPE_MAXIMUM (time_t)) + { + time_stamp.tv_sec = stamp; + time_stamp.tv_nsec = 0; + } + else + { + WARN ((stderr, + "%s: %s: MTIME %lu out of range for this platform\n", + program_name, ifname, stamp)); + time_stamp.tv_sec = TYPE_MAXIMUM (time_t); + time_stamp.tv_nsec = TIMESPEC_RESOLUTION - 1; + } + } + + magic[8] = get_byte (); /* Ignore extra flags. */ + magic[9] = get_byte (); /* Ignore OS type. */ + + if (flags & HEADER_CRC) + { + magic[2] = DEFLATED; + magic[3] = flags; + magic[4] = stamp & 0xff; + magic[5] = (stamp >> 8) & 0xff; + magic[6] = (stamp >> 16) & 0xff; + magic[7] = stamp >> 24; + updcrc (NULL, 0); + updcrc (magic, 10); + } + + if ((flags & EXTRA_FIELD) != 0) { + uch lenbuf[2]; + unsigned int len = lenbuf[0] = get_byte (); + len |= (lenbuf[1] = get_byte ()) << 8; + if (verbose) { + fprintf(stderr,"%s: %s: extra field of %u bytes ignored\n", + program_name, ifname, len); + } + if (flags & HEADER_CRC) + updcrc (lenbuf, 2); + discard_input_bytes (len, flags); + } + + /* Get original file name if it was truncated */ + if ((flags & ORIG_NAME) != 0) { + if (no_name || (to_stdout && !list) || part_nb > 1) { + /* Discard the old name */ + discard_input_bytes (-1, flags); + } else { + /* Copy the base name. Keep a directory prefix intact. */ char *p = gzip_base_name (ofname); char *base = p; - for (;;) { - *p = (char)get_char(); - if (*p++ == '\0') break; - if (p >= ofname+sizeof(ofname)) { - gzip_error ("corrupted input -- file name too large"); - } - } - p = gzip_base_name (base); - memmove (base, p, strlen (p) + 1); + for (;;) { + *p = (char) get_byte (); + if (*p++ == '\0') break; + if (p >= ofname+sizeof(ofname)) { + gzip_error ("corrupted input -- file name too large"); + } + } + if (flags & HEADER_CRC) + updcrc ((uch *) base, p - base); + p = gzip_base_name (base); + memmove (base, p, strlen (p) + 1); /* If necessary, adapt the name to local OS conventions: */ if (!list) { MAKE_LEGAL_NAME(base); - if (base) list=0; /* avoid warning about unused variable */ + if (base) list=0; /* avoid warning about unused variable */ } - } /* no_name || to_stdout */ - } /* ORIG_NAME */ + } /* no_name || to_stdout */ + } /* ORIG_NAME */ + + /* Discard file comment if any */ + if ((flags & COMMENT) != 0) { + discard_input_bytes (-1, flags); + } - /* 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 */ - } + if (flags & HEADER_CRC) + { + unsigned int crc16 = updcrc (magic, 0) & 0xffff; + unsigned int header16 = get_byte (); + header16 |= ((unsigned int) get_byte ()) << 8; + if (header16 != crc16) + { + fprintf (stderr, + "%s: %s: header checksum 0x%04x != computed checksum 0x%04x\n", + program_name, ifname, header16, crc16); + exit_code = ERROR; + if (force <= 1) + return -1; + } + } + + if (part_nb == 1) { + header_bytes = inptr + 2*4; /* 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. + && 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; + 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; + work = unpack; + method = PACKED; } else if (memcmp(magic, LZW_MAGIC, 2) == 0) { - work = unlzw; - method = COMPRESSED; - last_member = 1; + work = unlzw; + method = COMPRESSED; + last_member = 1; } else if (memcmp(magic, LZH_MAGIC, 2) == 0) { - work = unlzh; - method = LZHED; - last_member = 1; + work = unlzh; + method = LZHED; + last_member = 1; } else if (force && to_stdout && !list) { /* pass input unchanged */ - method = STORED; - work = copy; - inptr = 0; - last_member = 1; + method = STORED; + work = copy; + if (imagic1 != EOF) + inptr--; + last_member = 1; + if (imagic0 != EOF) { + write_buf (STDOUT_FILENO, magic, 1); + bytes_out++; + } } if (method >= 0) return method; if (part_nb == 1) { - fprintf (stderr, "\n%s: %s: not in gzip format\n", - program_name, ifname); - exit_code = ERROR; - return -1; + fprintf (stderr, "\n%s: %s: not in gzip format\n", + program_name, ifname); + exit_code = ERROR; + return -1; } else { - if (magic[0] == 0) - { - int inbyte; - for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ()) - continue; - if (inbyte == EOF) - { - if (verbose) - WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n", - program_name, ifname)); - return -3; - } - } - - WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n", - program_name, ifname)); - return -2; + if (magic[0] == 0) + { + int inbyte; + for (inbyte = imagic1; inbyte == 0; inbyte = try_byte ()) + continue; + if (inbyte == EOF) + { + if (verbose) + WARN ((stderr, "\n%s: %s: decompression OK, trailing zero bytes ignored\n", + program_name, ifname)); + return -3; + } + } + + WARN((stderr, "\n%s: %s: decompression OK, trailing garbage ignored\n", + program_name, ifname)); + return -2; } } @@ -1450,53 +1725,47 @@ local void do_list(ifd, method) { ulg crc; /* original crc */ static int first_time = 1; - static char* methods[MAX_METHODS] = { + static char const *const methods[MAX_METHODS] = { "store", /* 0 */ "compr", /* 1 */ "pack ", /* 2 */ "lzh ", /* 3 */ "", "", "", "", /* 4 to 7 reserved */ "defla"}; /* 8 */ - int positive_off_t_width = 1; - off_t o; - - for (o = OFF_T_MAX; 9 < o; o /= 10) { - positive_off_t_width++; - } + int positive_off_t_width = INT_STRLEN_BOUND (off_t) - 1; if (first_time && method >= 0) { - first_time = 0; - if (verbose) { - printf("method crc date time "); - } - if (!quiet) { - printf("%*.*s %*.*s ratio uncompressed_name\n", - positive_off_t_width, positive_off_t_width, "compressed", - positive_off_t_width, positive_off_t_width, "uncompressed"); - } + first_time = 0; + if (verbose) { + printf("method crc date time "); + } + if (!quiet) { + printf("%*.*s %*.*s ratio uncompressed_name\n", + positive_off_t_width, positive_off_t_width, "compressed", + positive_off_t_width, positive_off_t_width, "uncompressed"); + } } else if (method < 0) { - if (total_in <= 0 || total_out <= 0) return; - if (verbose) { - printf(" "); - } - if (verbose || !quiet) { - fprint_off(stdout, total_in, positive_off_t_width); - printf(" "); - fprint_off(stdout, total_out, positive_off_t_width); - printf(" "); - } - display_ratio(total_out-(total_in-header_bytes), total_out, stdout); - /* header_bytes is not meaningful but used to ensure the same - * ratio if there is a single file. - */ - printf(" (totals)\n"); - return; + if (total_in <= 0 || total_out <= 0) return; + if (verbose) { + printf(" "); + } + if (verbose || !quiet) { + fprint_off(stdout, total_in, positive_off_t_width); + printf(" "); + fprint_off(stdout, total_out, positive_off_t_width); + printf(" "); + } + display_ratio(total_out-(total_in-header_bytes), total_out, stdout); + /* header_bytes is not meaningful but used to ensure the same + * ratio if there is a single file. + */ + printf(" (totals)\n"); + return; } crc = (ulg)~0; /* unknown */ bytes_out = -1L; bytes_in = ifile_size; -#if RECORD_IO == 0 if (method == DEFLATED && !last_member) { /* Get the crc and uncompressed size for gzip'ed (not zip'ed) files. * If the lseek fails, we could use read() to get to the end, but @@ -1512,37 +1781,38 @@ local void do_list(ifd, method) read_error(); } crc = LG(buf); - bytes_out = LG(buf+4); - } + bytes_out = LG(buf+4); + } } -#endif /* RECORD_IO */ + if (verbose) { - struct tm *tm = localtime (&time_stamp.tv_sec); - printf ("%5s %08lx ", methods[method], crc); - if (tm) - printf ("%s%3d %02d:%02d ", - ("Jan\0Feb\0Mar\0Apr\0May\0Jun\0Jul\0Aug\0Sep\0Oct\0Nov\0Dec" - + 4 * tm->tm_mon), - tm->tm_mday, tm->tm_hour, tm->tm_min); - else - printf ("??? ?? ??:?? "); + static char const month_abbr[][4] + = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; + struct tm *tm = localtime (&time_stamp.tv_sec); + printf ("%5s %08lx ", methods[method], crc); + if (tm) + printf ("%s%3d %02d:%02d ", month_abbr[tm->tm_mon], + tm->tm_mday, tm->tm_hour, tm->tm_min); + else + printf ("??? ?? ??:?? "); } fprint_off(stdout, bytes_in, positive_off_t_width); printf(" "); fprint_off(stdout, bytes_out, positive_off_t_width); printf(" "); if (bytes_in == -1L) { - total_in = -1L; - bytes_in = bytes_out = header_bytes = 0; + total_in = -1L; + bytes_in = bytes_out = header_bytes = 0; } else if (total_in >= 0) { - total_in += bytes_in; + total_in += bytes_in; } if (bytes_out == -1L) { - total_out = -1L; - bytes_in = bytes_out = header_bytes = 0; + total_out = -1L; + bytes_in = bytes_out = header_bytes = 0; } else if (total_out >= 0) { - total_out += bytes_out; + total_out += bytes_out; } display_ratio(bytes_out-(bytes_in-header_bytes), bytes_out, stdout); printf(" %s\n", ofname); @@ -1568,10 +1838,10 @@ local void shorten_name(name) len = strlen(name); if (decompress) { - if (len <= 1) - gzip_error ("name too short"); - name[len-1] = '\0'; - return; + if (len <= 1) + gzip_error ("name too short"); + name[len-1] = '\0'; + return; } p = get_suffix(name); if (! p) @@ -1581,33 +1851,32 @@ local void shorten_name(name) /* compress 1234567890.tar to 1234567890.tgz */ if (len > 4 && strequ(p-4, ".tar")) { - strcpy(p-4, ".tgz"); - return; + strcpy(p-4, ".tgz"); + return; } /* Try keeping short extensions intact: * 1234.678.012.gz -> 123.678.012.gz */ do { - p = strrchr(name, PATH_SEP); - p = p ? p+1 : name; - while (*p) { - plen = strcspn(p, PART_SEP); - p += plen; - if (plen > min_part) trunc = p-1; - if (*p) p++; - } + p = last_component (name); + while (*p) { + plen = strcspn(p, PART_SEP); + p += plen; + if (plen > min_part) trunc = p-1; + if (*p) p++; + } } while (trunc == NULL && --min_part != 0); if (trunc != NULL) { - do { - trunc[0] = trunc[1]; - } while (*trunc++); - trunc--; + do { + trunc[0] = trunc[1]; + } while (*trunc++); + trunc--; } else { - trunc = strrchr(name, PART_SEP[0]); - if (!trunc) - gzip_error ("internal error in shorten_name"); - if (trunc[1] == '\0') trunc--; /* force truncation */ + trunc = strrchr(name, PART_SEP[0]); + if (!trunc) + gzip_error ("internal error in shorten_name"); + if (trunc[1] == '\0') trunc--; /* force truncation */ } strcpy(trunc, z_suffix); } @@ -1620,26 +1889,44 @@ local int check_ofname() { /* Ask permission to overwrite the existing file */ if (!force) { - int ok = 0; - fprintf (stderr, "%s: %s already exists;", program_name, ofname); - if (foreground && isatty(fileno(stdin))) { - fprintf(stderr, " do you wish to overwrite (y or n)? "); - fflush(stderr); - ok = yesno(); - } - if (!ok) { - fprintf(stderr, "\tnot overwritten\n"); - if (exit_code == OK) exit_code = WARNING; - return ERROR; - } + int ok = 0; + fprintf (stderr, "%s: %s already exists;", program_name, ofname); + if (foreground && (presume_input_tty || isatty (STDIN_FILENO))) { + fprintf(stderr, " do you wish to overwrite (y or n)? "); + fflush(stderr); + ok = yesno(); + } + if (!ok) { + fprintf(stderr, "\tnot overwritten\n"); + if (exit_code == OK) exit_code = WARNING; + return ERROR; + } } if (xunlink (ofname)) { - progerror(ofname); - return ERROR; + progerror(ofname); + return ERROR; } return OK; } +/* Change the owner and group of a file. FD is a file descriptor for + the file and NAME its name. Change it to user UID and to group GID. + If UID or GID is -1, though, do not change the corresponding user + or group. */ +#if ! (HAVE_FCHOWN || HAVE_CHOWN) +/* The types uid_t and gid_t do not exist on mingw, so don't assume them. */ +# define do_chown(fd, name, uid, gid) ((void) 0) +#else +static void +do_chown (int fd, char const *name, uid_t uid, gid_t gid) +{ +# if HAVE_FCHOWN + ignore_value (fchown (fd, uid, gid)); +# else + ignore_value (chown (name, uid, gid)); +# endif +} +#endif /* ======================================================================== * Copy modes, times, ownership from input file to output file. @@ -1652,130 +1939,108 @@ local void copy_stat(ifstat) int r; #ifndef NO_UTIME + bool restoring; struct timespec timespec[2]; timespec[0] = get_stat_atime (ifstat); timespec[1] = get_stat_mtime (ifstat); + restoring = (decompress && 0 <= time_stamp.tv_nsec + && ! (timespec[1].tv_sec == time_stamp.tv_sec + && timespec[1].tv_nsec == time_stamp.tv_nsec)); + if (restoring) + timespec[1] = time_stamp; - if (decompress && 0 <= time_stamp.tv_nsec - && ! (timespec[1].tv_sec == time_stamp.tv_sec - && timespec[1].tv_nsec == time_stamp.tv_nsec)) + if (fdutimens (ofd, ofname, timespec) == 0) { - timespec[1] = time_stamp; - if (verbose > 1) { - fprintf(stderr, "%s: time stamp restored\n", ofname); - } + if (restoring && 1 < verbose) { + fprintf(stderr, "%s: timestamp restored\n", ofname); + } } - - if (gz_futimens (ofd, ofname, timespec) != 0) + else { - int e = errno; - WARN ((stderr, "%s: ", program_name)); - if (!quiet) - { - errno = e; - perror (ofname); - } + int e = errno; + WARN ((stderr, "%s: ", program_name)); + if (!quiet) + { + errno = e; + perror (ofname); + } } #endif -#ifndef NO_CHOWN -# if HAVE_FCHOWN - fchown (ofd, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */ -# elif HAVE_CHOWN - chown(ofname, ifstat->st_uid, ifstat->st_gid); /* Copy ownership */ -# endif -#endif + /* Change the group first, then the permissions, then the owner. + That way, the permissions will be correct on systems that allow + users to give away files, without introducing a security hole. + Security depends on permissions not containing the setuid or + setgid bits. */ + + do_chown (ofd, ofname, -1, ifstat->st_gid); - /* Copy the protection modes */ #if HAVE_FCHMOD r = fchmod (ofd, mode); #else r = chmod (ofname, mode); #endif if (r != 0) { - int e = errno; - WARN ((stderr, "%s: ", program_name)); - if (!quiet) { - errno = e; - perror(ofname); - } + int e = errno; + WARN ((stderr, "%s: ", program_name)); + if (!quiet) { + errno = e; + perror(ofname); + } } + + do_chown (ofd, ofname, ifstat->st_uid, -1); } #if ! NO_DIR /* ======================================================================== - * Recurse through the given directory. This code is taken from ncompress. + * Recurse through the given directory. */ local void treat_dir (fd, dir) int fd; char *dir; { - struct dirent *dp; DIR *dirp; char nbuf[MAX_PATH_LEN]; - int len; + char *entries; + char const *entry; + size_t entrylen; -#if HAVE_FDOPENDIR dirp = fdopendir (fd); -#else - close (fd); - dirp = opendir(dir); -#endif if (dirp == NULL) { - progerror(dir); -#if HAVE_FDOPENDIR - close (fd); -#endif - return ; + progerror(dir); + close (fd); + return ; } - /* - ** WARNING: the following algorithm could occasionally cause - ** compress to produce error warnings of the form ".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 ((errno = 0, dp = readdir(dirp)) != NULL) { - - if (strequ(dp->d_name,".") || strequ(dp->d_name,"..")) { - continue; - } - len = strlen(dir); - if (len + _D_EXACT_NAMLEN (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", - program_name, dir, dp->d_name); - exit_code = ERROR; - } + entries = streamsavedir (dirp, SAVEDIR_SORT_NONE); + if (! entries) + progerror (dir); + if (closedir (dirp) != 0) + progerror (dir); + if (! entries) + return; + + for (entry = entries; *entry; entry += entrylen + 1) { + size_t len = strlen (dir); + entrylen = strlen (entry); + if (strequ (entry, ".") || strequ (entry, "..")) + continue; + if (len + entrylen < MAX_PATH_LEN - 2) { + strcpy(nbuf,dir); + if (*last_component (nbuf) && !ISSLASH (nbuf[len - 1])) + nbuf[len++] = '/'; + strcpy (nbuf + len, entry); + treat_file(nbuf); + } else { + fprintf(stderr,"%s: %s/%s: pathname too long\n", + program_name, dir, entry); + exit_code = ERROR; + } } - if (errno != 0) - progerror(dir); - if (CLOSEDIR(dirp) != 0) - progerror(dir); + free (entries); } #endif /* ! NO_DIR */ @@ -1786,8 +2051,6 @@ install_signal_handlers () { int nsigs = sizeof handled_sig / sizeof handled_sig[0]; int i; - -#if SA_NOCLDSTOP struct sigaction act; sigemptyset (&caught_signals); @@ -1795,7 +2058,7 @@ install_signal_handlers () { sigaction (handled_sig[i], NULL, &act); if (act.sa_handler != SIG_IGN) - sigaddset (&caught_signals, handled_sig[i]); + sigaddset (&caught_signals, handled_sig[i]); } act.sa_handler = abort_gzip_signal; @@ -1805,20 +2068,10 @@ install_signal_handlers () for (i = 0; i < nsigs; i++) if (sigismember (&caught_signals, handled_sig[i])) { - if (i == 0) - foreground = 1; - sigaction (handled_sig[i], &act, NULL); - } -#else - for (i = 0; i < nsigs; i++) - if (signal (handled_sig[i], SIG_IGN) != SIG_IGN) - { - if (i == 0) - foreground = 1; - signal (handled_sig[i], abort_gzip_signal); - siginterrupt (handled_sig[i], 1); + if (i == 0) + foreground = 1; + sigaction (handled_sig[i], &act, NULL); } -#endif } /* ======================================================================== @@ -1831,8 +2084,8 @@ local void do_exit(exitcode) if (in_exit) exit(exitcode); in_exit = 1; - if (env != NULL) free(env), env = NULL; - if (args != NULL) free((char*)args), args = NULL; + free(env); + env = NULL; FREE(inbuf); FREE(outbuf); FREE(d_buf); @@ -1846,46 +2099,55 @@ local void do_exit(exitcode) exit(exitcode); } +static void +finish_out (void) +{ + if (fclose (stdout) != 0) + write_error (); + do_exit (OK); +} + /* ======================================================================== * Close and unlink the output file. */ static void -remove_output_file () +remove_output_file (bool signals_already_blocked) { int fd; sigset_t oldset; - sigprocmask (SIG_BLOCK, &caught_signals, &oldset); + if (!signals_already_blocked) + sigprocmask (SIG_BLOCK, &caught_signals, &oldset); fd = remove_ofname_fd; if (0 <= fd) { + char fname[MAX_PATH_LEN]; remove_ofname_fd = -1; close (fd); - xunlink (ofname); + volatile_strcpy (fname, remove_ofname); + xunlink (fname); } - sigprocmask (SIG_SETMASK, &oldset, NULL); + if (!signals_already_blocked) + sigprocmask (SIG_SETMASK, &oldset, NULL); } /* ======================================================================== * Error handler. */ void -abort_gzip () +abort_gzip (void) { - remove_output_file (); + remove_output_file (false); do_exit(ERROR); } /* ======================================================================== * Signal handler. */ -static RETSIGTYPE -abort_gzip_signal (sig) - int sig; +static void +abort_gzip_signal (int sig) { - if (! SA_NOCLDSTOP) - signal (sig, SIG_IGN); - remove_output_file (); + remove_output_file (true); if (sig == exiting_signal) _exit (WARNING); signal (sig, SIG_DFL);