X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fbuffer.c;h=1b36051e19c784f7e5588162c8f7b06a92ea2f3c;hb=84378fa99ae3ce256fea9eb25d8ae999d1c91fdf;hp=3e10acc3a3fb345c7fd5f48fcfe29bdcae70d100;hpb=5019d3b2d9e2b00ccea82551000e726268cda183;p=chaz%2Ftar diff --git a/src/buffer.c b/src/buffer.c index 3e10acc..1b36051 100644 --- a/src/buffer.c +++ b/src/buffer.c @@ -1,5 +1,8 @@ /* Buffer management for tar. - Copyright (C) 1988, 92, 93, 94, 96, 97, 1999 Free Software Foundation, Inc. + + Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001, + 2003, 2004, 2005, 2006 Free Software Foundation, Inc. + Written by John Gilmore, on 1985-08-25. This program is free software; you can redistribute it and/or modify it @@ -14,74 +17,49 @@ 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., - 59 Place - Suite 330, Boston, MA 02111-1307, USA. */ + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ -#include "system.h" +#include #include -#include -time_t time (); - -#if MSDOS -# include -#endif -#if XENIX -# include -#endif - -#ifndef FNM_LEADING_DIR -# include -#endif +#include +#include +#include +#include #include "common.h" -#include "rmt.h" - -#define DEBUG_FORK 0 /* if nonzero, childs are born stopped */ - -#define STDIN 0 /* standard input file descriptor */ -#define STDOUT 1 /* standard output file descriptor */ - -#define PREAD 0 /* read file descriptor from pipe() */ -#define PWRITE 1 /* write file descriptor from pipe() */ +#include /* Number of retries before giving up on read. */ #define READ_ERROR_MAX 10 /* Globbing pattern to append to volume label if initial match failed. */ #define VOLUME_LABEL_APPEND " Volume [1-9]*" - + /* Variables. */ -static tarlong total_written; /* bytes written on all volumes */ +static tarlong prev_written; /* bytes written on previous volumes */ static tarlong bytes_written; /* bytes written on this volume */ +static void *record_buffer[2]; /* allocated memory */ +static int record_index; -/* FIXME: The following four variables should ideally be static to this - module. However, this cannot be done yet, as update.c uses the first - three a lot, and compare.c uses the fourth. The cleanup continues! */ +/* FIXME: The following variables should ideally be static to this + module. However, this cannot be done yet. The cleanup continues! */ union block *record_start; /* start of record of archive */ union block *record_end; /* last+1 block of archive record */ union block *current_block; /* current block of archive */ enum access_mode access_mode; /* how do we handle the archive */ -static struct stat archive_stat; /* stat block for archive file */ +off_t records_read; /* number of records read from this archive */ +off_t records_written; /* likewise, for records written */ static off_t record_start_block; /* block ordinal at record_start */ -/* Where we write list messages (not errors, not interactions) to. Stdout - unless we're writing a pipe, in which case stderr. */ +/* Where we write list messages (not errors, not interactions) to. */ FILE *stdlis; -static void backspace_output PARAMS ((void)); -static int new_volume PARAMS ((enum access_mode)); -static void write_error PARAMS ((ssize_t)); -static void read_error PARAMS ((void)); - -#if !MSDOS -/* Obnoxious test to see if dimwit is trying to dump the archive. */ -dev_t ar_dev; -ino_t ar_ino; -#endif +static void backspace_output (void); /* PID of child program, if compress_option or remote archive access. */ static pid_t child_pid; @@ -90,133 +68,270 @@ static pid_t child_pid; static int read_error_count; /* Have we hit EOF yet? */ -static int hit_eof; +static bool hit_eof; /* Checkpointing counter */ static int checkpoint; -/* We're reading, but we just read the last block and its time to update. */ -/* As least EXTERN like this one as possible. FIXME! */ -extern int time_to_start_writing; +static bool read_full_records = false; + +/* We're reading, but we just read the last block and it's time to update. + Declared in update.c + + As least EXTERN like this one as possible. (?? --gray) + FIXME: Either eliminate it or move it to common.h. +*/ +extern bool time_to_start_writing; -int file_to_switch_to = -1; /* if remote update, close archive, and use - this descriptor to write to */ +bool write_archive_to_stdout; +void (*flush_write_ptr) (size_t); +void (*flush_read_ptr) (void); + + +char *volume_label; +char *continued_file_name; +uintmax_t continued_file_size; +uintmax_t continued_file_offset; + + static int volno = 1; /* which volume of a multi-volume tape we're on */ static int global_volno = 1; /* volume number to print in external messages */ -/* The pointer save_name, which is set in function dump_file() of module - create.c, points to the original long filename instead of the new, - shorter mangled name that is set in start_header() of module create.c. - The pointer save_name is only used in multi-volume mode when the file - being processed is non-sparse; if a file is split between volumes, the - save_name is used in generating the LF_MULTIVOL record on the second - volume. (From Pierce Cantrell, 1991-08-13.) */ - -char *save_name; /* name of the file we are currently writing */ -off_t save_totsize; /* total size of file we are writing, only - valid if save_name is non NULL */ -off_t save_sizeleft; /* where we are in the file we are writing, - only valid if save_name is nonzero */ - -int write_archive_to_stdout = 0; +bool write_archive_to_stdout; /* Used by flush_read and flush_write to store the real info about saved names. */ -static char *real_s_name = NULL; +static char *real_s_name; static off_t real_s_totsize; static off_t real_s_sizeleft; + -/* Functions. */ +/* Multi-volume tracking support */ +static char *save_name; /* name of the file we are currently writing */ +static off_t save_totsize; /* total size of file we are writing, only + valid if save_name is nonzero */ +static off_t save_sizeleft; /* where we are in the file we are writing, + only valid if save_name is nonzero */ + +void +mv_begin (struct tar_stat_info *st) +{ + if (multi_volume_option) + { + assign_string (&save_name, st->orig_file_name); + save_totsize = save_sizeleft = st->stat.st_size; + } +} -#if DEBUG_FORK +void +mv_end () +{ + if (multi_volume_option) + assign_string (&save_name, 0); +} -static pid_t -myfork (void) +void +mv_total_size (off_t size) { - pid_t result = fork(); + save_totsize = size; +} - if (result == 0) - kill (getpid (), SIGSTOP); - return result; +void +mv_size_left (off_t size) +{ + save_sizeleft = size; +} + + +/* Functions. */ + +void +clear_read_error_count (void) +{ + read_error_count = 0; } -# define fork myfork + +/* Time-related functions */ -#endif /* DEBUG FORK */ +double duration; void -init_total_written (void) +set_start_time () { - clear_tarlong (total_written); - clear_tarlong (bytes_written); + gettime (&start_time); } void -print_total_written (void) +compute_duration () +{ + struct timespec now; + gettime (&now); + duration += ((now.tv_sec - start_time.tv_sec) + + (now.tv_nsec - start_time.tv_nsec) / 1e9); + set_start_time (); +} + + +/* Compression detection */ + +enum compress_type { + ct_none, + ct_compress, + ct_gzip, + ct_bzip2 +}; + +struct zip_magic +{ + enum compress_type type; + size_t length; + char *magic; + char *program; + char *option; +}; + +static struct zip_magic const magic[] = { + { ct_none, }, + { ct_compress, 2, "\037\235", "compress", "-Z" }, + { ct_gzip, 2, "\037\213", "gzip", "-z" }, + { ct_bzip2, 3, "BZh", "bzip2", "-j" }, +}; + +#define NMAGIC (sizeof(magic)/sizeof(magic[0])) + +#define compress_option(t) magic[t].option +#define compress_program(t) magic[t].program + +/* Check if the file ARCHIVE is a compressed archive. */ +enum compress_type +check_compressed_archive () +{ + struct zip_magic const *p; + bool sfr; + + /* Prepare global data needed for find_next_block: */ + record_end = record_start; /* set up for 1st record = # 0 */ + sfr = read_full_records; + read_full_records = true; /* Suppress fatal error on reading a partial + record */ + find_next_block (); + + /* Restore global values */ + read_full_records = sfr; + + if (tar_checksum (record_start, true) == HEADER_SUCCESS) + /* Probably a valid header */ + return ct_none; + + for (p = magic + 1; p < magic + NMAGIC; p++) + if (memcmp (record_start->buffer, p->magic, p->length) == 0) + return p->type; + + return ct_none; +} + +/* Open an archive named archive_name_array[0]. Detect if it is + a compressed archive of known type and use corresponding decompression + program if so */ +int +open_compressed_archive () { - fprintf (stderr, _("Total bytes written: ")); - print_tarlong (total_written, stderr); - fprintf (stderr, "\n"); + archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY, + MODE_RW, rsh_command_option); + if (archive == -1) + return archive; + + if (!multi_volume_option) + { + enum compress_type type = check_compressed_archive (); + + if (type == ct_none) + return archive; + + /* FD is not needed any more */ + rmtclose (archive); + + hit_eof = false; /* It might have been set by find_next_block in + check_compressed_archive */ + + /* Open compressed archive */ + use_compress_program_option = compress_program (type); + child_pid = sys_child_open_for_uncompress (); + read_full_records = true; + } + + records_read = 0; + record_end = record_start; /* set up for 1st record = # 0 */ + + return archive; } + + +void +print_total_written (void) +{ + tarlong written = prev_written + bytes_written; + char bytes[sizeof (tarlong) * CHAR_BIT]; + char abbr[LONGEST_HUMAN_READABLE + 1]; + char rate[LONGEST_HUMAN_READABLE + 1]; -/*--------------------------------------------------------. -| Compute and return the block ordinal at current_block. | -`--------------------------------------------------------*/ + int human_opts = human_autoscale | human_base_1024 | human_SI | human_B; + sprintf (bytes, TARLONG_FORMAT, written); + + /* Amanda 2.4.1p1 looks for "Total bytes written: [0-9][0-9]*". */ + fprintf (stderr, _("Total bytes written: %s (%s, %s/s)\n"), bytes, + human_readable (written, abbr, human_opts, 1, 1), + (0 < duration && written / duration < (uintmax_t) -1 + ? human_readable (written / duration, rate, human_opts, 1, 1) + : "?")); +} + +/* Compute and return the block ordinal at current_block. */ off_t current_block_ordinal (void) { return record_start_block + (current_block - record_start); } -/*------------------------------------------------------------------. -| If the EOF flag is set, reset it, as well as current_block, etc. | -`------------------------------------------------------------------*/ - +/* If the EOF flag is set, reset it, as well as current_block, etc. */ void reset_eof (void) { if (hit_eof) { - hit_eof = 0; + hit_eof = false; current_block = record_start; record_end = record_start + blocking_factor; access_mode = ACCESS_WRITE; } } -/*-------------------------------------------------------------------------. -| Return the location of the next available input or output block. | -| Return NULL for EOF. Once we have returned NULL, we just keep returning | -| it, to avoid accidentally going on to the next file on the tape. | -`-------------------------------------------------------------------------*/ - +/* Return the location of the next available input or output block. + Return zero for EOF. Once we have returned zero, we just keep returning + it, to avoid accidentally going on to the next file on the tape. */ union block * find_next_block (void) { if (current_block == record_end) { if (hit_eof) - return NULL; + return 0; flush_archive (); if (current_block == record_end) { - hit_eof = 1; - return NULL; + hit_eof = true; + return 0; } } return current_block; } -/*------------------------------------------------------. -| Indicate that we have used all blocks up thru BLOCK. | -| | -| FIXME: should the arg have an off-by-1? | -`------------------------------------------------------*/ - +/* Indicate that we have used all blocks up thru BLOCK. */ void set_next_block_after (union block *block) { @@ -231,855 +346,1048 @@ set_next_block_after (union block *block) abort (); } -/*------------------------------------------------------------------------. -| Return the number of bytes comprising the space between POINTER through | -| the end of the current buffer of blocks. This space is available for | -| filling with data, or taking data from. POINTER is usually (but not | -| always) the result previous find_next_block call. | -`------------------------------------------------------------------------*/ - +/* Return the number of bytes comprising the space between POINTER + through the end of the current buffer of blocks. This space is + available for filling with data, or taking data from. POINTER is + usually (but not always) the result of previous find_next_block call. */ size_t available_space_after (union block *pointer) { return record_end->buffer - pointer->buffer; } -/*------------------------------------------------------------------. -| Close file having descriptor FD, and abort if close unsucessful. | -`------------------------------------------------------------------*/ - -static void +/* Close file having descriptor FD, and abort if close unsuccessful. */ +void xclose (int fd) { - if (close (fd) < 0) - FATAL_ERROR ((0, errno, _("Cannot close file #%d"), fd)); + if (close (fd) != 0) + close_error (_("(pipe)")); } -/*-----------------------------------------------------------------------. -| Duplicate file descriptor FROM into becoming INTO, or else, issue | -| MESSAGE. INTO is closed first and has to be the next available slot. | -`-----------------------------------------------------------------------*/ - static void -xdup2 (int from, int into, const char *message) +init_buffer () { - if (from != into) - { - int status = close (into); - - if (status < 0 && errno != EBADF) - FATAL_ERROR ((0, errno, _("Cannot close descriptor %d"), into)); - status = dup (from); - if (status != into) - FATAL_ERROR ((0, errno, _("Cannot properly duplicate %s"), message)); - xclose (from); - } -} - -#if MSDOS - -/*-------------------------------------------------------. -| Set ARCHIVE for writing, then compressing an archive. | -`-------------------------------------------------------*/ + if (!record_buffer[record_index]) + page_aligned_alloc (&record_buffer[record_index], record_size); -static void -child_open_for_compress (void) -{ - FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives"))); + record_start = record_buffer[record_index]; + current_block = record_start; + record_end = record_start + blocking_factor; } -/*---------------------------------------------------------. -| Set ARCHIVE for uncompressing, then reading an archive. | -`---------------------------------------------------------*/ - +/* Open an archive file. The argument specifies whether we are + reading or writing, or both. */ static void -child_open_for_uncompress (void) +_open_archive (enum access_mode wanted_access) { - FATAL_ERROR ((0, 0, _("Cannot use compressed or remote archives"))); -} - -#else /* not MSDOS */ - -/*---------------------------------------------------------------------. -| Return nonzero if NAME is the name of a regular file, or if the file | -| does not exist (so it would be created as a regular file). | -`---------------------------------------------------------------------*/ + int backed_up_flag = 0; -static int -is_regular_file (const char *name) -{ - struct stat stbuf; + if (index_file_name) + { + stdlis = freopen (index_file_name, "w", stdout); + if (! stdlis) + open_error (index_file_name); + close_stdout_set_file_name (index_file_name); + } + else + stdlis = to_stdout_option ? stderr : stdout; - if (stat (name, &stbuf) < 0) - return 1; + if (record_size == 0) + FATAL_ERROR ((0, 0, _("Invalid value for record_size"))); - if (S_ISREG (stbuf.st_mode)) - return 1; + if (archive_names == 0) + FATAL_ERROR ((0, 0, _("No archive name given"))); - return 0; -} + tar_stat_destroy (¤t_stat_info); + save_name = 0; + real_s_name = 0; -/*-------------------------------------------------------. -| Set ARCHIVE for writing, then compressing an archive. | -`-------------------------------------------------------*/ + record_index = 0; + init_buffer (); -static void -child_open_for_compress (void) -{ - int parent_pipe[2]; - int child_pipe[2]; - pid_t grandchild_pid; + /* When updating the archive, we start with reading. */ + access_mode = wanted_access == ACCESS_UPDATE ? ACCESS_READ : wanted_access; - if (pipe (parent_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); + read_full_records = read_full_records_option; - child_pid = fork (); - if (child_pid < 0) - FATAL_ERROR ((0, errno, _("Cannot fork"))); + records_read = 0; - if (child_pid > 0) + if (use_compress_program_option) { - /* The parent tar is still here! Just clean up. */ - - archive = parent_pipe[PWRITE]; - xclose (parent_pipe[PREAD]); - return; - } + switch (wanted_access) + { + case ACCESS_READ: + child_pid = sys_child_open_for_uncompress (); + read_full_records = true; + record_end = record_start; /* set up for 1st record = # 0 */ + break; - /* The new born child tar is here! */ + case ACCESS_WRITE: + child_pid = sys_child_open_for_compress (); + break; - program_name = _("tar (child)"); + case ACCESS_UPDATE: + abort (); /* Should not happen */ + break; + } - xdup2 (parent_pipe[PREAD], STDIN, _("(child) Pipe to stdin")); - xclose (parent_pipe[PWRITE]); + if (wanted_access == ACCESS_WRITE + && strcmp (archive_name_array[0], "-") == 0) + stdlis = stderr; + } + else if (strcmp (archive_name_array[0], "-") == 0) + { + read_full_records = true; /* could be a pipe, be safe */ + if (verify_option) + FATAL_ERROR ((0, 0, _("Cannot verify stdin/stdout archive"))); - /* Check if we need a grandchild tar. This happens only if either: - a) we are writing stdout: to force reblocking; - b) the file is to be accessed by rmt: compressor doesn't know how; - c) the file is not a plain file. */ + switch (wanted_access) + { + case ACCESS_READ: + { + enum compress_type type; - if (strcmp (archive_name_array[0], "-") != 0 - && !_remdev (archive_name_array[0]) - && is_regular_file (archive_name_array[0])) - { - if (backup_option) - maybe_backup_file (archive_name_array[0], 1); + archive = STDIN_FILENO; - /* We don't need a grandchild tar. Open the archive and launch the - compressor. */ + type = check_compressed_archive (archive); + if (type != ct_none) + FATAL_ERROR ((0, 0, + _("Archive is compressed. Use %s option"), + compress_option (type))); + } + break; - archive = creat (archive_name_array[0], 0666); - if (archive < 0) - { - int saved_errno = errno; + case ACCESS_WRITE: + archive = STDOUT_FILENO; + stdlis = stderr; + break; - if (backup_option) - undo_last_backup (); - FATAL_ERROR ((0, saved_errno, _("Cannot open archive %s"), - archive_name_array[0])); + case ACCESS_UPDATE: + archive = STDIN_FILENO; + stdlis = stderr; + write_archive_to_stdout = true; + break; } - xdup2 (archive, STDOUT, _("Archive to stdout")); - execlp (use_compress_program_option, use_compress_program_option, - (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); } + else if (verify_option) + archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY, + MODE_RW, rsh_command_option); + else + switch (wanted_access) + { + case ACCESS_READ: + archive = open_compressed_archive (); + break; - /* We do need a grandchild tar. */ - - if (pipe (child_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); + case ACCESS_WRITE: + if (backup_option) + { + maybe_backup_file (archive_name_array[0], 1); + backed_up_flag = 1; + } + archive = rmtcreat (archive_name_array[0], MODE_RW, + rsh_command_option); + break; - grandchild_pid = fork (); - if (grandchild_pid < 0) - FATAL_ERROR ((0, errno, _("Child cannot fork"))); + case ACCESS_UPDATE: + archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY, + MODE_RW, rsh_command_option); + break; + } - if (grandchild_pid > 0) + if (archive < 0 + || (! _isrmt (archive) && !sys_get_archive_stat ())) { - /* The child tar is still here! Launch the compressor. */ - - xdup2 (child_pipe[PWRITE], STDOUT, _("((child)) Pipe to stdout")); - xclose (child_pipe[PREAD]); - execlp (use_compress_program_option, use_compress_program_option, - (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + int saved_errno = errno; + + if (backed_up_flag) + undo_last_backup (); + errno = saved_errno; + open_fatal (archive_name_array[0]); } - /* The new born grandchild tar is here! */ + sys_detect_dev_null_output (); + sys_save_archive_dev_ino (); + SET_BINARY_MODE (archive); - program_name = _("tar (grandchild)"); + switch (wanted_access) + { + case ACCESS_UPDATE: + records_written = 0; + record_end = record_start; /* set up for 1st record = # 0 */ - /* Prepare for reblocking the data from the compressor into the archive. */ + case ACCESS_READ: + find_next_block (); /* read it in, check for EOF */ + break; - xdup2 (child_pipe[PREAD], STDIN, _("(grandchild) Pipe to stdin")); - xclose (child_pipe[PWRITE]); + case ACCESS_WRITE: + records_written = 0; + break; + } +} - if (strcmp (archive_name_array[0], "-") == 0) - archive = STDOUT; - else - archive = rmtcreat (archive_name_array[0], 0666, rsh_command_option); - if (archive < 0) - FATAL_ERROR ((0, errno, _("Cannot open archive %s"), - archive_name_array[0])); +/* Perform a write to flush the buffer. */ +ssize_t +_flush_write (void) +{ + ssize_t status; - /* Let's read out of the stdin pipe and write an archive. */ + if (checkpoint_option && !(++checkpoint % 10)) + /* TRANSLATORS: This is a ``checkpoint of write operation'', + *not* ``Writing a checkpoint''. + E.g. in Spanish ``Punto de comprobaci@'on de escritura'', + *not* ``Escribiendo un punto de comprobaci@'on'' */ + WARN ((0, 0, _("Write checkpoint %d"), checkpoint)); - while (1) + if (tape_length_option && tape_length_option <= bytes_written) { - ssize_t status = 0; - char *cursor; - size_t length; - - /* Assemble a record. */ - - for (length = 0, cursor = record_start->buffer; - length < record_size; - length += status, cursor += status) - { - size_t size = record_size - length; - - if (size < BLOCKSIZE) - size = BLOCKSIZE; - status = read (STDIN, cursor, size); - if (status <= 0) - break; - } + errno = ENOSPC; + status = 0; + } + else if (dev_null_output) + status = record_size; + else + status = sys_write_archive_buffer (); - if (status < 0) - FATAL_ERROR ((0, errno, _("Cannot read from compression program"))); + return status; +} - /* Copy the record. */ +/* Handle write errors on the archive. Write errors are always fatal. + Hitting the end of a volume does not cause a write error unless the + write was the first record of the volume. */ +void +archive_write_error (ssize_t status) +{ + /* It might be useful to know how much was written before the error + occurred. */ + if (totals_option) + { + int e = errno; + print_total_written (); + errno = e; + } - if (status == 0) - { - /* We hit the end of the file. Write last record at - full length, as the only role of the grandchild is - doing proper reblocking. */ + write_fatal_details (*archive_name_cursor, status, record_size); +} - if (length > 0) - { - memset (record_start->buffer + length, 0, record_size - length); - status = rmtwrite (archive, record_start->buffer, record_size); - if (status != record_size) - write_error (status); - } +/* Handle read errors on the archive. If the read should be retried, + return to the caller. */ +void +archive_read_error (void) +{ + read_error (*archive_name_cursor); - /* There is nothing else to read, break out. */ - break; - } + if (record_start_block == 0) + FATAL_ERROR ((0, 0, _("At beginning of tape, quitting now"))); - status = rmtwrite (archive, record_start->buffer, record_size); - if (status != record_size) - write_error (status); - } + /* Read error in mid archive. We retry up to READ_ERROR_MAX times and + then give up on reading the archive. */ -#if 0 - close_archive (); -#endif - exit (exit_status); + if (read_error_count++ > READ_ERROR_MAX) + FATAL_ERROR ((0, 0, _("Too many errors, quitting"))); + return; } -/*---------------------------------------------------------. -| Set ARCHIVE for uncompressing, then reading an archive. | -`---------------------------------------------------------*/ - static void -child_open_for_uncompress (void) +short_read (size_t status) { - int parent_pipe[2]; - int child_pipe[2]; - pid_t grandchild_pid; - - if (pipe (parent_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); + size_t left; /* bytes left */ + char *more; /* pointer to next byte to read */ - child_pid = fork (); - if (child_pid < 0) - FATAL_ERROR ((0, errno, _("Cannot fork"))); + more = record_start->buffer + status; + left = record_size - status; - if (child_pid > 0) + while (left % BLOCKSIZE != 0 + || (left && status && read_full_records)) { - /* The parent tar is still here! Just clean up. */ - - read_full_records_option = 1; - archive = parent_pipe[PREAD]; - xclose (parent_pipe[PWRITE]); - return; - } + if (status) + while ((status = rmtread (archive, more, left)) == SAFE_READ_ERROR) + archive_read_error (); - /* The new born child tar is here! */ + if (status == 0) + break; - program_name = _("tar (child)"); + if (! read_full_records) + { + unsigned long rest = record_size - left; - xdup2 (parent_pipe[PWRITE], STDOUT, _("(child) Pipe to stdout")); - xclose (parent_pipe[PREAD]); + FATAL_ERROR ((0, 0, + ngettext ("Unaligned block (%lu byte) in archive", + "Unaligned block (%lu bytes) in archive", + rest), + rest)); + } - /* Check if we need a grandchild tar. This happens only if either: - a) we're reading stdin: to force unblocking; - b) the file is to be accessed by rmt: compressor doesn't know how; - c) the file is not a plain file. */ + /* User warned us about this. Fix up. */ - if (strcmp (archive_name_array[0], "-") != 0 - && !_remdev (archive_name_array[0]) - && is_regular_file (archive_name_array[0])) - { - /* We don't need a grandchild tar. Open the archive and lauch the - uncompressor. */ - - archive = open (archive_name_array[0], O_RDONLY | O_BINARY, 0666); - if (archive < 0) - FATAL_ERROR ((0, errno, _("Cannot open archive %s"), - archive_name_array[0])); - xdup2 (archive, STDIN, _("Archive to stdin")); - execlp (use_compress_program_option, use_compress_program_option, - "-d", (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + left -= status; + more += status; } - /* We do need a grandchild tar. */ - - if (pipe (child_pipe) < 0) - FATAL_ERROR ((0, errno, _("Cannot open pipe"))); - - grandchild_pid = fork (); - if (grandchild_pid < 0) - FATAL_ERROR ((0, errno, _("Child cannot fork"))); + /* FIXME: for size=0, multi-volume support. On the first record, warn + about the problem. */ - if (grandchild_pid > 0) + if (!read_full_records && verbose_option > 1 + && record_start_block == 0 && status != 0) { - /* The child tar is still here! Launch the uncompressor. */ - - xdup2 (child_pipe[PREAD], STDIN, _("((child)) Pipe to stdin")); - xclose (child_pipe[PWRITE]); - execlp (use_compress_program_option, use_compress_program_option, - "-d", (char *) 0); - FATAL_ERROR ((0, errno, _("Cannot exec %s"), - use_compress_program_option)); + unsigned long rsize = (record_size - left) / BLOCKSIZE; + WARN ((0, 0, + ngettext ("Record size = %lu block", + "Record size = %lu blocks", + rsize), + rsize)); } - /* The new born grandchild tar is here! */ - - program_name = _("tar (grandchild)"); + record_end = record_start + (record_size - left) / BLOCKSIZE; + records_read++; +} - /* Prepare for unblocking the data from the archive into the uncompressor. */ +/* Perform a read to flush the buffer. */ +size_t +_flush_read (void) +{ + size_t status; /* result from system call */ - xdup2 (child_pipe[PWRITE], STDOUT, _("(grandchild) Pipe to stdout")); - xclose (child_pipe[PREAD]); + if (checkpoint_option && !(++checkpoint % 10)) + /* TRANSLATORS: This is a ``checkpoint of read operation'', + *not* ``Reading a checkpoint''. + E.g. in Spanish ``Punto de comprobaci@'on de lectura'', + *not* ``Leyendo un punto de comprobaci@'on'' */ + WARN ((0, 0, _("Read checkpoint %d"), checkpoint)); - if (strcmp (archive_name_array[0], "-") == 0) - archive = STDIN; - else - archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY, - 0666, rsh_command_option); - if (archive < 0) - FATAL_ERROR ((0, errno, _("Cannot open archive %s"), - archive_name_array[0])); + /* Clear the count of errors. This only applies to a single call to + flush_read. */ - /* Let's read the archive and pipe it into stdout. */ + read_error_count = 0; /* clear error count */ - while (1) + if (write_archive_to_stdout && record_start_block != 0) { - char *cursor; - size_t maximum; - size_t count; - ssize_t status; - - read_error_count = 0; + archive = STDOUT_FILENO; + status = sys_write_archive_buffer (); + archive = STDIN_FILENO; + if (status != record_size) + archive_write_error (status); + } - error_loop: - status = rmtread (archive, record_start->buffer, record_size); - if (status < 0) - { - read_error (); - goto error_loop; - } - if (status == 0) - break; - cursor = record_start->buffer; - maximum = status; - while (maximum) - { - count = maximum < BLOCKSIZE ? maximum : BLOCKSIZE; - status = write (STDOUT, cursor, count); - if (status < 0) - FATAL_ERROR ((0, errno, _("\ -Cannot write to compression program"))); + status = rmtread (archive, record_start->buffer, record_size); + if (status == record_size) + records_read++; + return status; +} - if (status != count) - { - ERROR ((0, 0, _("\ -Write to compression program short %lu bytes"), - (unsigned long) (count - status))); - count = status; - } +/* Flush the current buffer to/from the archive. */ +void +flush_archive (void) +{ + size_t buffer_level = current_block->buffer - record_start->buffer; + record_start_block += record_end - record_start; + current_block = record_start; + record_end = record_start + blocking_factor; - cursor += count; - maximum -= count; - } + if (access_mode == ACCESS_READ && time_to_start_writing) + { + access_mode = ACCESS_WRITE; + time_to_start_writing = false; + backspace_output (); } -#if 0 - close_archive (); -#endif - exit (exit_status); + switch (access_mode) + { + case ACCESS_READ: + flush_read (); + break; + + case ACCESS_WRITE: + flush_write_ptr (buffer_level); + break; + + case ACCESS_UPDATE: + abort (); + } } -#endif /* not MSDOS */ +/* Backspace the archive descriptor by one record worth. If it's a + tape, MTIOCTOP will work. If it's something else, try to seek on + it. If we can't seek, we lose! */ +static void +backspace_output (void) +{ +#ifdef MTIOCTOP + { + struct mtop operation; + + operation.mt_op = MTBSR; + operation.mt_count = 1; + if (rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0) + return; + if (errno == EIO && rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0) + return; + } +#endif + + { + off_t position = rmtlseek (archive, (off_t) 0, SEEK_CUR); -/*--------------------------------------------------------------------------. -| Check the LABEL block against the volume label, seen as a globbing | -| pattern. Return true if the pattern matches. In case of failure, retry | -| matching a volume sequence number before giving up in multi-volume mode. | -`--------------------------------------------------------------------------*/ + /* Seek back to the beginning of this record and start writing there. */ -static int -check_label_pattern (union block *label) + position -= record_size; + if (position < 0) + position = 0; + if (rmtlseek (archive, position, SEEK_SET) != position) + { + /* Lseek failed. Try a different method. */ + + WARN ((0, 0, + _("Cannot backspace archive file; it may be unreadable without -i"))); + + /* Replace the first part of the record with NULs. */ + + if (record_start->buffer != output_start) + memset (record_start->buffer, 0, + output_start - record_start->buffer); + } + } +} + +off_t +seek_archive (off_t size) { - char *string; - int result; + off_t start = current_block_ordinal (); + off_t offset; + off_t nrec, nblk; + off_t skipped = (blocking_factor - (current_block - record_start)); - if (fnmatch (volume_label_option, label->header.name, 0) == 0) - return 1; + size -= skipped * BLOCKSIZE; - if (!multi_volume_option) + if (size < record_size) return 0; + /* FIXME: flush? */ - string = xmalloc (strlen (volume_label_option) - + sizeof VOLUME_LABEL_APPEND + 1); - strcpy (string, volume_label_option); - strcat (string, VOLUME_LABEL_APPEND); - result = fnmatch (string, label->header.name, 0) == 0; - free (string); - return result; -} + /* Compute number of records to skip */ + nrec = size / record_size; + offset = rmtlseek (archive, nrec * record_size, SEEK_CUR); + if (offset < 0) + return offset; + + if (offset % record_size) + FATAL_ERROR ((0, 0, _("rmtlseek not stopped at a record boundary"))); + + /* Convert to number of records */ + offset /= BLOCKSIZE; + /* Compute number of skipped blocks */ + nblk = offset - start; -/*------------------------------------------------------------------------. -| Open an archive file. The argument specifies whether we are reading or | -| writing, or both. | -`------------------------------------------------------------------------*/ + /* Update buffering info */ + records_read += nblk / blocking_factor; + record_start_block = offset - blocking_factor; + current_block = record_end; + return nblk; +} + +/* Close the archive file. */ void -open_archive (enum access_mode access) +close_archive (void) { - int backed_up_flag = 0; + if (time_to_start_writing || access_mode == ACCESS_WRITE) + { + flush_archive (); + if (current_block > record_start) + flush_archive (); + } - stdlis = to_stdout_option ? stderr : stdout; + sys_drain_input_pipe (); - if (record_size == 0) - FATAL_ERROR ((0, 0, _("Invalid value for record_size"))); + compute_duration (); + if (verify_option) + verify_volume (); - if (archive_names == 0) - FATAL_ERROR ((0, 0, _("No archive name given"))); + if (rmtclose (archive) != 0) + close_warn (*archive_name_cursor); - current_file_name = NULL; - current_link_name = NULL; + sys_wait_for_child (child_pid); + + tar_stat_destroy (¤t_stat_info); + if (save_name) + free (save_name); + if (real_s_name) + free (real_s_name); + free (record_buffer[0]); + free (record_buffer[1]); +} - /* FIXME: According to POSIX.1, PATH_MAX may well not be a compile-time - constant, and the value from sysconf (_SC_PATH_MAX) may well not be any - size that is reasonable to allocate a buffer. In the GNU system, there - is no fixed limit. The only correct thing to do is to use dynamic - allocation. (Roland McGrath) */ +/* Called to initialize the global volume number. */ +void +init_volume_number (void) +{ + FILE *file = fopen (volno_file_option, "r"); - if (!real_s_name) - real_s_name = (char *) xmalloc (PATH_MAX); - /* FIXME: real_s_name is never freed. */ + if (file) + { + if (fscanf (file, "%d", &global_volno) != 1 + || global_volno < 0) + FATAL_ERROR ((0, 0, _("%s: contains invalid volume number"), + quotearg_colon (volno_file_option))); + if (ferror (file)) + read_error (volno_file_option); + if (fclose (file) != 0) + close_error (volno_file_option); + } + else if (errno != ENOENT) + open_error (volno_file_option); +} - save_name = NULL; +/* Called to write out the closing global volume number. */ +void +closeout_volume_number (void) +{ + FILE *file = fopen (volno_file_option, "w"); - if (multi_volume_option) + if (file) { - record_start - = (union block *) valloc (record_size + (2 * BLOCKSIZE)); - if (record_start) - record_start += 2; + fprintf (file, "%d\n", global_volno); + if (ferror (file)) + write_error (volno_file_option); + if (fclose (file) != 0) + close_error (volno_file_option); } else - record_start = (union block *) valloc (record_size); - if (!record_start) - FATAL_ERROR ((0, 0, _("Could not allocate memory for blocking factor %d"), - blocking_factor)); + open_error (volno_file_option); +} - current_block = record_start; - record_end = record_start + blocking_factor; - /* When updating the archive, we start with reading. */ - access_mode = access == ACCESS_UPDATE ? ACCESS_READ : access; + +static void +increase_volume_number () +{ + global_volno++; + if (global_volno < 0) + FATAL_ERROR ((0, 0, _("Volume number overflow"))); + volno++; +} - if (multi_volume_option && verify_option) - FATAL_ERROR ((0, 0, _("Cannot verify multi-volume archives"))); +void +change_tape_menu (FILE *read_file) +{ + char *input_buffer = NULL; + size_t size = 0; - if (use_compress_program_option) + while (1) { - if (multi_volume_option) - FATAL_ERROR ((0, 0, _("Cannot use multi-volume compressed archives"))); - if (verify_option) - FATAL_ERROR ((0, 0, _("Cannot verify compressed archives"))); + fputc ('\007', stderr); + fprintf (stderr, + _("Prepare volume #%d for %s and hit return: "), + global_volno + 1, quote (*archive_name_cursor)); + fflush (stderr); - switch (access) + if (getline (&input_buffer, &size, read_file) <= 0) { - case ACCESS_READ: - child_open_for_uncompress (); - break; + WARN ((0, 0, _("EOF where user reply was expected"))); - case ACCESS_WRITE: - child_open_for_compress (); - break; + if (subcommand_option != EXTRACT_SUBCOMMAND + && subcommand_option != LIST_SUBCOMMAND + && subcommand_option != DIFF_SUBCOMMAND) + WARN ((0, 0, _("WARNING: Archive is incomplete"))); - case ACCESS_UPDATE: - FATAL_ERROR ((0, 0, _("Cannot update compressed archives"))); - break; + fatal_exit (); } - if (access == ACCESS_WRITE && strcmp (archive_name_array[0], "-") == 0) - stdlis = stderr; - } - else if (strcmp (archive_name_array[0], "-") == 0) - { - read_full_records_option = 1; /* could be a pipe, be safe */ - if (verify_option) - FATAL_ERROR ((0, 0, _("Cannot verify stdin/stdout archive"))); + if (input_buffer[0] == '\n' + || input_buffer[0] == 'y' + || input_buffer[0] == 'Y') + break; - switch (access) + switch (input_buffer[0]) { - case ACCESS_READ: - archive = STDIN; + case '?': + { + fprintf (stderr, _("\ + n [name] Give a new file name for the next (and subsequent) volume(s)\n\ + q Abort tar\n\ + y or newline Continue operation\n")); + if (!restrict_option) + fprintf (stderr, _(" ! Spawn a subshell\n")); + fprintf (stderr, _(" ? Print this list\n")); + } break; - case ACCESS_WRITE: - archive = STDOUT; - stdlis = stderr; - break; + case 'q': + /* Quit. */ - case ACCESS_UPDATE: - archive = STDIN; - stdlis = stderr; - write_archive_to_stdout = 1; + WARN ((0, 0, _("No new volume; exiting.\n"))); + + if (subcommand_option != EXTRACT_SUBCOMMAND + && subcommand_option != LIST_SUBCOMMAND + && subcommand_option != DIFF_SUBCOMMAND) + WARN ((0, 0, _("WARNING: Archive is incomplete"))); + + fatal_exit (); + + case 'n': + /* Get new file name. */ + + { + char *name; + char *cursor; + + for (name = input_buffer + 1; + *name == ' ' || *name == '\t'; + name++) + ; + + for (cursor = name; *cursor && *cursor != '\n'; cursor++) + ; + *cursor = '\0'; + + /* FIXME: the following allocation is never reclaimed. */ + *archive_name_cursor = xstrdup (name); + } break; + + case '!': + if (!restrict_option) + { + sys_spawn_shell (); + break; + } + /* FALL THROUGH */ + + default: + fprintf (stderr, _("Invalid input. Type ? for help.\n")); + } + } + free (input_buffer); +} + +/* We've hit the end of the old volume. Close it and open the next one. + Return nonzero on success. +*/ +static bool +new_volume (enum access_mode mode) +{ + static FILE *read_file; + static int looped; + + if (!read_file && !info_script_option) + /* FIXME: if fopen is used, it will never be closed. */ + read_file = archive == STDIN_FILENO ? fopen (TTY_NAME, "r") : stdin; + + if (now_verifying) + return false; + if (verify_option) + verify_volume (); + + assign_string (&volume_label, NULL); + assign_string (&continued_file_name, NULL); + continued_file_size = continued_file_offset = 0; + + if (rmtclose (archive) != 0) + close_warn (*archive_name_cursor); + + archive_name_cursor++; + if (archive_name_cursor == archive_name_array + archive_names) + { + archive_name_cursor = archive_name_array; + looped = 1; + } + + tryagain: + if (looped) + { + /* We have to prompt from now on. */ + + if (info_script_option) + { + if (volno_file_option) + closeout_volume_number (); + if (sys_exec_info_script (archive_name_cursor, global_volno+1)) + FATAL_ERROR ((0, 0, _("%s command failed"), + quote (info_script_option))); } + else + change_tape_menu (read_file); + } + + if (strcmp (archive_name_cursor[0], "-") == 0) + { + read_full_records = true; + archive = STDIN_FILENO; } else if (verify_option) - archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY, - 0666, rsh_command_option); + archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, MODE_RW, + rsh_command_option); else - switch (access) + switch (mode) { case ACCESS_READ: - archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY, 0666, + archive = rmtopen (*archive_name_cursor, O_RDONLY, MODE_RW, rsh_command_option); break; case ACCESS_WRITE: if (backup_option) - { - maybe_backup_file (archive_name_array[0], 1); - backed_up_flag = 1; - } - archive = rmtcreat (archive_name_array[0], 0666, rsh_command_option); + maybe_backup_file (*archive_name_cursor, 1); + archive = rmtcreat (*archive_name_cursor, MODE_RW, + rsh_command_option); break; case ACCESS_UPDATE: - archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY, - 0666, rsh_command_option); + archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, MODE_RW, + rsh_command_option); break; } if (archive < 0) { - int saved_errno = errno; - - if (backed_up_flag) + open_warn (*archive_name_cursor); + if (!verify_option && mode == ACCESS_WRITE && backup_option) undo_last_backup (); - FATAL_ERROR ((0, saved_errno, _("Cannot open %s"), - archive_name_array[0])); + goto tryagain; } -#if !MSDOS + SET_BINARY_MODE (archive); - fstat (archive, &archive_stat); + return true; +} - /* Detect if outputting to "/dev/null". */ - { - struct stat dev_null_stat; +static bool +read_header0 () +{ + enum read_header rc = read_header (false); - stat ("/dev/null", &dev_null_stat); - dev_null_output = (S_ISCHR (archive_stat.st_mode) - && archive_stat.st_rdev == dev_null_stat.st_rdev); - } + if (rc == HEADER_SUCCESS) + { + set_next_block_after (current_header); + return true; + } + ERROR ((0, 0, _("This does not look like a tar archive"))); + return false; +} + +bool +try_new_volume () +{ + size_t status; + union block *header; - if (!_isrmt (archive) && S_ISREG (archive_stat.st_mode)) + switch (subcommand_option) { - ar_dev = archive_stat.st_dev; - ar_ino = archive_stat.st_ino; + case APPEND_SUBCOMMAND: + case CAT_SUBCOMMAND: + case UPDATE_SUBCOMMAND: + if (!new_volume (ACCESS_UPDATE)) + return true; + break; + + default: + if (!new_volume (ACCESS_READ)) + return true; + break; } -#endif /* not MSDOS */ + while ((status = rmtread (archive, record_start->buffer, record_size)) + == SAFE_READ_ERROR) + archive_read_error (); -#if MSDOS - setmode (archive, O_BINARY); -#endif + if (status != record_size) + short_read (status); - switch (access) + header = find_next_block (); + if (!header) + return false; + switch (header->header.typeflag) { - case ACCESS_READ: - case ACCESS_UPDATE: - record_end = record_start; /* set up for 1st record = # 0 */ - find_next_block (); /* read it in, check for EOF */ + case XGLTYPE: + { + struct tar_stat_info dummy; + if (!read_header0 ()) + return false; + tar_stat_init (&dummy); + xheader_decode (&dummy); /* decodes values from the global header */ + tar_stat_destroy (&dummy); + if (!real_s_name) + { + /* We have read the extended header of the first member in + this volume. Put it back, so next read_header works as + expected. */ + current_block = record_start; + } + break; + } - if (volume_label_option) - { - union block *label = find_next_block (); - - if (!label) - FATAL_ERROR ((0, 0, _("Archive not labelled to match `%s'"), - volume_label_option)); - if (!check_label_pattern (label)) - FATAL_ERROR ((0, 0, _("Volume `%s' does not match `%s'"), - label->header.name, volume_label_option)); - } + case GNUTYPE_VOLHDR: + if (!read_header0 ()) + return false; + assign_string (&volume_label, current_header->header.name); + set_next_block_after (header); + header = find_next_block (); + if (header->header.typeflag != GNUTYPE_MULTIVOL) + break; + /* FALL THROUGH */ + + case GNUTYPE_MULTIVOL: + if (!read_header0 ()) + return false; + assign_string (&continued_file_name, current_header->header.name); + continued_file_size = + UINTMAX_FROM_HEADER (current_header->header.size); + continued_file_offset = + UINTMAX_FROM_HEADER (current_header->oldgnu_header.offset); break; - case ACCESS_WRITE: - if (volume_label_option) - { - memset ((void *) record_start, 0, BLOCKSIZE); - if (multi_volume_option) - sprintf (record_start->header.name, "%s Volume 1", - volume_label_option); - else - strcpy (record_start->header.name, volume_label_option); - - assign_string (¤t_file_name, record_start->header.name); - - record_start->header.typeflag = GNUTYPE_VOLHDR; - TIME_TO_OCT (time (0), record_start->header.mtime); - finish_header (record_start); -#if 0 - current_block++; -#endif - } + default: break; } -} -/*--------------------------------------. -| Perform a write to flush the buffer. | -`--------------------------------------*/ + if (real_s_name) + { + uintmax_t s; + if (!continued_file_name + || strcmp (continued_file_name, real_s_name)) + { + WARN ((0, 0, _("%s is not continued on this volume"), + quote (real_s_name))); + return false; + } -void -flush_write (void) -{ - int copy_back; - ssize_t status; + s = continued_file_size + continued_file_offset; - if (checkpoint_option && !(++checkpoint % 10)) - WARN ((0, 0, _("Write checkpoint %d"), checkpoint)); + if (real_s_totsize != s || s < continued_file_offset) + { + char totsizebuf[UINTMAX_STRSIZE_BOUND]; + char s1buf[UINTMAX_STRSIZE_BOUND]; + char s2buf[UINTMAX_STRSIZE_BOUND]; + + WARN ((0, 0, _("%s is the wrong size (%s != %s + %s)"), + quote (continued_file_name), + STRINGIFY_BIGINT (save_totsize, totsizebuf), + STRINGIFY_BIGINT (continued_file_size, s1buf), + STRINGIFY_BIGINT (continued_file_offset, s2buf))); + return false; + } - if (!zerop_tarlong (tape_length_option) - && !lessp_tarlong (bytes_written, tape_length_option)) - { - errno = ENOSPC; /* FIXME: errno should be read-only */ - status = 0; + if (real_s_totsize - real_s_sizeleft != continued_file_offset) + { + WARN ((0, 0, _("This volume is out of sequence"))); + return false; + } } - else if (dev_null_output) - status = record_size; - else - status = rmtwrite (archive, record_start->buffer, record_size); - if (status != record_size && !multi_volume_option) - write_error (status); - else if (totals_option) - add_to_tarlong (total_written, record_size); - if (status > 0) - add_to_tarlong (bytes_written, status); + increase_volume_number (); + return true; +} - if (status == record_size) - { - if (multi_volume_option) - { - char *cursor; + +/* Check the LABEL block against the volume label, seen as a globbing + pattern. Return true if the pattern matches. In case of failure, + retry matching a volume sequence number before giving up in + multi-volume mode. */ +static bool +check_label_pattern (union block *label) +{ + char *string; + bool result; - if (!save_name) - { - real_s_name[0] = '\0'; - real_s_totsize = 0; - real_s_sizeleft = 0; - return; - } + if (! memchr (label->header.name, '\0', sizeof label->header.name)) + return false; - cursor = save_name; -#if MSDOS - if (cursor[1] == ':') - cursor += 2; -#endif - while (*cursor == '/') - cursor++; + if (fnmatch (volume_label_option, label->header.name, 0) == 0) + return true; - strcpy (real_s_name, cursor); - real_s_totsize = save_totsize; - real_s_sizeleft = save_sizeleft; - } - return; - } + if (!multi_volume_option) + return false; - /* We're multivol. Panic if we didn't get the right kind of response. */ + string = xmalloc (strlen (volume_label_option) + + sizeof VOLUME_LABEL_APPEND + 1); + strcpy (string, volume_label_option); + strcat (string, VOLUME_LABEL_APPEND); + result = fnmatch (string, label->header.name, 0) == 0; + free (string); + return result; +} - /* ENXIO is for the UNIX PC. */ - if (status < 0 && errno != ENOSPC && errno != EIO && errno != ENXIO) - write_error (status); +/* Check if the next block contains a volume label and if this matches + the one given in the command line */ +static void +match_volume_label (void) +{ + union block *label = find_next_block (); + + if (!label) + FATAL_ERROR ((0, 0, _("Archive not labeled to match %s"), + quote (volume_label_option))); + if (!check_label_pattern (label)) + FATAL_ERROR ((0, 0, _("Volume %s does not match %s"), + quote_n (0, label->header.name), + quote_n (1, volume_label_option))); +} - /* If error indicates a short write, we just move to the next tape. */ +/* Mark the archive with volume label STR. */ +static void +_write_volume_label (const char *str) +{ + if (archive_format == POSIX_FORMAT) + xheader_store ("GNU.volume.label", NULL, str); + else + { + union block *label = find_next_block (); - if (!new_volume (ACCESS_WRITE)) - return; + memset (label, 0, BLOCKSIZE); - clear_tarlong (bytes_written); + strcpy (label->header.name, volume_label_option); + assign_string (¤t_stat_info.file_name, + label->header.name); + current_stat_info.had_trailing_slash = + strip_trailing_slashes (current_stat_info.file_name); - if (volume_label_option && real_s_name[0]) - { - copy_back = 2; - record_start -= 2; + label->header.typeflag = GNUTYPE_VOLHDR; + TIME_TO_CHARS (start_time.tv_sec, label->header.mtime); + finish_header (¤t_stat_info, label, -1); + set_next_block_after (label); } - else if (volume_label_option || real_s_name[0]) - { - copy_back = 1; - record_start--; - } - else - copy_back = 0; +} - if (volume_label_option) +#define VOL_SUFFIX "Volume" + +/* Add a volume label to a part of multi-volume archive */ +static void +add_volume_label (void) +{ + char buf[UINTMAX_STRSIZE_BOUND]; + char *p = STRINGIFY_BIGINT (volno, buf); + char *s = xmalloc (strlen (volume_label_option) + sizeof VOL_SUFFIX + + strlen (p) + 2); + sprintf (s, "%s %s %s", volume_label_option, VOL_SUFFIX, p); + _write_volume_label (s); + free (s); +} + +static void +add_chunk_header () +{ + if (archive_format == POSIX_FORMAT) { - memset ((void *) record_start, 0, BLOCKSIZE); - sprintf (record_start->header.name, "%s Volume %d", volume_label_option, volno); - TIME_TO_OCT (time (0), record_start->header.mtime); - record_start->header.typeflag = GNUTYPE_VOLHDR; - finish_header (record_start); + off_t block_ordinal; + union block *blk; + struct tar_stat_info st; + static size_t real_s_part_no; /* FIXME */ + + real_s_part_no++; + memset (&st, 0, sizeof st); + st.orig_file_name = st.file_name = real_s_name; + st.stat.st_mode = S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH; + st.stat.st_uid = getuid (); + st.stat.st_gid = getgid (); + st.orig_file_name = xheader_format_name (&st, + "%d/GNUFileParts.%p/%f.%n", + real_s_part_no); + st.file_name = st.orig_file_name; + st.archive_file_size = st.stat.st_size = real_s_sizeleft; + + block_ordinal = current_block_ordinal (); + blk = start_header (&st); + free (st.orig_file_name); + if (!blk) + abort (); /* FIXME */ + finish_header (&st, blk, block_ordinal); } +} - if (real_s_name[0]) - { - int tmp; - if (volume_label_option) - record_start++; +/* Add a volume label to the current archive */ +static void +write_volume_label (void) +{ + if (multi_volume_option) + add_volume_label (); + else + _write_volume_label (volume_label_option); +} - memset ((void *) record_start, 0, BLOCKSIZE); +/* Write GNU multi-volume header */ +static void +gnu_add_multi_volume_header (void) +{ + int tmp; + union block *block = find_next_block (); - /* FIXME: Michael P Urban writes: [a long name file] is being written - when a new volume rolls around [...] Looks like the wrong value is - being preserved in real_s_name, though. */ + if (strlen (real_s_name) > NAME_FIELD_SIZE) + WARN ((0, 0, + _("%s: file name too long to be stored in a GNU multivolume header, truncated"), + quotearg_colon (real_s_name))); - strcpy (record_start->header.name, real_s_name); - record_start->header.typeflag = GNUTYPE_MULTIVOL; - OFF_TO_OCT (real_s_sizeleft, record_start->header.size); - OFF_TO_OCT (real_s_totsize - real_s_sizeleft, - record_start->oldgnu_header.offset); - tmp = verbose_option; - verbose_option = 0; - finish_header (record_start); - verbose_option = tmp; + memset (block, 0, BLOCKSIZE); - if (volume_label_option) - record_start--; - } + /* FIXME: Michael P Urban writes: [a long name file] is being written + when a new volume rolls around [...] Looks like the wrong value is + being preserved in real_s_name, though. */ - status = rmtwrite (archive, record_start->buffer, record_size); - if (status != record_size) - write_error (status); - else if (totals_option) - add_to_tarlong (total_written, record_size); - - add_to_tarlong (bytes_written, record_size); - if (copy_back) - { - record_start += copy_back; - memcpy ((void *) current_block, - (void *) (record_start + blocking_factor - copy_back), - (size_t) (copy_back * BLOCKSIZE)); - current_block += copy_back; - - if (real_s_sizeleft >= copy_back * BLOCKSIZE) - real_s_sizeleft -= copy_back * BLOCKSIZE; - else if ((real_s_sizeleft + BLOCKSIZE - 1) / BLOCKSIZE <= copy_back) - real_s_name[0] = '\0'; - else - { - char *cursor = save_name; + strncpy (block->header.name, real_s_name, NAME_FIELD_SIZE); + block->header.typeflag = GNUTYPE_MULTIVOL; -#if MSDOS - if (cursor[1] == ':') - cursor += 2; -#endif - while (*cursor == '/') - cursor++; + OFF_TO_CHARS (real_s_sizeleft, block->header.size); + OFF_TO_CHARS (real_s_totsize - real_s_sizeleft, + block->oldgnu_header.offset); - strcpy (real_s_name, cursor); - real_s_sizeleft = save_sizeleft; - real_s_totsize = save_totsize; - } - copy_back = 0; - } + tmp = verbose_option; + verbose_option = 0; + finish_header (¤t_stat_info, block, -1); + verbose_option = tmp; + set_next_block_after (block); } -/*---------------------------------------------------------------------. -| Handle write errors on the archive. Write errors are always fatal. | -| Hitting the end of a volume does not cause a write error unless the | -| write was the first record of the volume. | -`---------------------------------------------------------------------*/ - +/* Add a multi volume header to the current archive. The exact header format + depends on the archive format. */ static void -write_error (ssize_t status) +add_multi_volume_header (void) { - int saved_errno = errno; - - /* It might be useful to know how much was written before the error - occured. Beware that mere printing maybe change errno value. */ - if (totals_option) - print_total_written (); - - if (status < 0) - FATAL_ERROR ((0, saved_errno, _("Cannot write to %s"), - *archive_name_cursor)); + if (archive_format == POSIX_FORMAT) + { + off_t d = real_s_totsize - real_s_sizeleft; + xheader_store ("GNU.volume.filename", NULL, real_s_name); + xheader_store ("GNU.volume.size", NULL, &real_s_sizeleft); + xheader_store ("GNU.volume.offset", NULL, &d); + } else - FATAL_ERROR ((0, 0, _("Only wrote %lu of %lu bytes to %s"), - (unsigned long) status, (unsigned long) record_size, - *archive_name_cursor)); + gnu_add_multi_volume_header (); } -/*-------------------------------------------------------------------. -| Handle read errors on the archive. If the read should be retried, | -| returns to the caller. | -`-------------------------------------------------------------------*/ - +/* Synchronize multi-volume globals */ static void -read_error (void) +multi_volume_sync () { - WARN ((0, errno, _("Read error on %s"), *archive_name_cursor)); - - if (record_start_block == 0) - FATAL_ERROR ((0, 0, _("At beginning of tape, quitting now"))); - - /* Read error in mid archive. We retry up to READ_ERROR_MAX times and - then give up on reading the archive. */ - - if (read_error_count++ > READ_ERROR_MAX) - FATAL_ERROR ((0, 0, _("Too many errors, quitting"))); - return; + if (multi_volume_option) + { + if (save_name) + { + assign_string (&real_s_name, + safer_name_suffix (save_name, false, + absolute_names_option)); + real_s_totsize = save_totsize; + real_s_sizeleft = save_sizeleft; + } + else + { + assign_string (&real_s_name, 0); + real_s_totsize = 0; + real_s_sizeleft = 0; + } + } } -/*-------------------------------------. -| Perform a read to flush the buffer. | -`-------------------------------------*/ + +/* Low-level flush functions */ -void -flush_read (void) +/* Simple flush read (no multi-volume or label extensions) */ +static void +simple_flush_read (void) { - ssize_t status; /* result from system call */ - size_t left; /* bytes left */ - char *more; /* pointer to next byte to read */ + size_t status; /* result from system call */ if (checkpoint_option && !(++checkpoint % 10)) + /* TRANSLATORS: This is a ``checkpoint of read operation'', + *not* ``Reading a checkpoint''. + E.g. in Spanish ``Punto de comprobaci@'on de lectura'', + *not* ``Leyendo un punto de comprobaci@'on'' */ WARN ((0, 0, _("Read checkpoint %d"), checkpoint)); /* Clear the count of errors. This only applies to a single call to @@ -1089,595 +1397,231 @@ flush_read (void) if (write_archive_to_stdout && record_start_block != 0) { - status = rmtwrite (1, record_start->buffer, record_size); + archive = STDOUT_FILENO; + status = sys_write_archive_buffer (); + archive = STDIN_FILENO; if (status != record_size) - write_error (status); + archive_write_error (status); } - if (multi_volume_option) - if (save_name) - { - char *cursor = save_name; -#if MSDOS - if (cursor[1] == ':') - cursor += 2; -#endif - while (*cursor == '/') - cursor++; - - strcpy (real_s_name, cursor); - real_s_sizeleft = save_sizeleft; - real_s_totsize = save_totsize; - } - else - { - real_s_name[0] = '\0'; - real_s_totsize = 0; - real_s_sizeleft = 0; - } - -error_loop: - status = rmtread (archive, record_start->buffer, record_size); - if (status == record_size) - return; - - if ((status == 0 - || (status < 0 && errno == ENOSPC) - || (status > 0 && !read_full_records_option)) - && multi_volume_option) + for (;;) { - union block *cursor; - - try_volume: - switch (subcommand_option) - { - case APPEND_SUBCOMMAND: - case CAT_SUBCOMMAND: - case UPDATE_SUBCOMMAND: - if (!new_volume (ACCESS_UPDATE)) - return; - break; - - default: - if (!new_volume (ACCESS_READ)) - return; - break; - } - - vol_error: status = rmtread (archive, record_start->buffer, record_size); - if (status < 0) - { - read_error (); - goto vol_error; - } - if (status != record_size) - goto short_read; - - cursor = record_start; - - if (cursor->header.typeflag == GNUTYPE_VOLHDR) + if (status == record_size) { - if (volume_label_option) - { - if (!check_label_pattern (cursor)) - { - WARN ((0, 0, _("Volume `%s' does not match `%s'"), - cursor->header.name, volume_label_option)); - volno--; - global_volno--; - goto try_volume; - } - } - if (verbose_option) - fprintf (stdlis, _("Reading %s\n"), cursor->header.name); - cursor++; + records_read++; + return; } - else if (volume_label_option) - WARN ((0, 0, _("WARNING: No volume header"))); - - if (real_s_name[0]) + if (status == SAFE_READ_ERROR) { - uintmax_t s1, s2; - if (cursor->header.typeflag != GNUTYPE_MULTIVOL - || strcmp (cursor->header.name, real_s_name)) - { - WARN ((0, 0, _("%s is not continued on this volume"), - real_s_name)); - volno--; - global_volno--; - goto try_volume; - } - s1 = UINTMAX_FROM_OCT (cursor->header.size); - s2 = UINTMAX_FROM_OCT (cursor->oldgnu_header.offset); - if (real_s_totsize != s1 + s2 || s1 + s2 < s2) - { - char totsizebuf[UINTMAX_STRSIZE_BOUND]; - char s1buf[UINTMAX_STRSIZE_BOUND]; - char s2buf[UINTMAX_STRSIZE_BOUND]; - - WARN ((0, 0, _("%s is the wrong size (%s != %s + %s)"), - cursor->header.name, - STRINGIFY_BIGINT (save_totsize, totsizebuf), - STRINGIFY_BIGINT (s1, s1buf), - STRINGIFY_BIGINT (s2, s2buf))); - volno--; - global_volno--; - goto try_volume; - } - if (real_s_totsize - real_s_sizeleft - != OFF_FROM_OCT (cursor->oldgnu_header.offset)) - { - WARN ((0, 0, _("This volume is out of sequence"))); - volno--; - global_volno--; - goto try_volume; - } - cursor++; + archive_read_error (); + continue; /* try again */ } - current_block = cursor; - return; - } - else if (status < 0) - { - read_error (); - goto error_loop; /* try again */ + break; } + short_read (status); +} -short_read: - more = record_start->buffer + status; - left = record_size - status; - -again: - if (left % BLOCKSIZE == 0) - { - /* FIXME: for size=0, multi-volume support. On the first record, warn - about the problem. */ - - if (!read_full_records_option && verbose_option - && record_start_block == 0 && status > 0) - WARN ((0, 0, _("Record size = %lu blocks"), - (unsigned long) (status / BLOCKSIZE))); - - record_end = record_start + (record_size - left) / BLOCKSIZE; +/* Simple flush write (no multi-volume or label extensions) */ +static void +simple_flush_write (size_t level __attribute__((unused))) +{ + ssize_t status; - return; - } - if (read_full_records_option) + status = _flush_write (); + if (status != record_size) + archive_write_error (status); + else { - /* User warned us about this. Fix up. */ - - if (left > 0) - { - error2loop: - status = rmtread (archive, more, left); - if (status < 0) - { - read_error (); - goto error2loop; /* try again */ - } - if (status == 0) - FATAL_ERROR ((0, 0, _("Archive %s EOF not on block boundary"), - *archive_name_cursor)); - left -= status; - more += status; - goto again; - } + records_written++; + bytes_written += status; } - else - FATAL_ERROR ((0, 0, _("Only read %lu bytes from archive %s"), - (unsigned long) status, *archive_name_cursor)); } -/*-----------------------------------------------. -| Flush the current buffer to/from the archive. | -`-----------------------------------------------*/ + +/* GNU flush functions. These support multi-volume and archive labels in + GNU and PAX archive formats. */ -void -flush_archive (void) +static void +_gnu_flush_read (void) { - record_start_block += record_end - record_start; - current_block = record_start; - record_end = record_start + blocking_factor; + size_t status; /* result from system call */ - if (access_mode == ACCESS_READ && time_to_start_writing) - { - access_mode = ACCESS_WRITE; - time_to_start_writing = 0; + if (checkpoint_option && !(++checkpoint % 10)) + /* TRANSLATORS: This is a ``checkpoint of read operation'', + *not* ``Reading a checkpoint''. + E.g. in Spanish ``Punto de comprobaci@'on de lectura'', + *not* ``Leyendo un punto de comprobaci@'on'' */ + WARN ((0, 0, _("Read checkpoint %d"), checkpoint)); - if (file_to_switch_to >= 0) - { - int status = rmtclose (archive); + /* Clear the count of errors. This only applies to a single call to + flush_read. */ - if (status < 0) - WARN ((0, errno, _("WARNING: Cannot close %s (%d, %d)"), - *archive_name_cursor, archive, status)); + read_error_count = 0; /* clear error count */ - archive = file_to_switch_to; - } - else - backspace_output (); + if (write_archive_to_stdout && record_start_block != 0) + { + archive = STDOUT_FILENO; + status = sys_write_archive_buffer (); + archive = STDIN_FILENO; + if (status != record_size) + archive_write_error (status); } - switch (access_mode) + multi_volume_sync (); + + for (;;) { - case ACCESS_READ: - flush_read (); - break; + status = rmtread (archive, record_start->buffer, record_size); + if (status == record_size) + { + records_read++; + return; + } - case ACCESS_WRITE: - flush_write (); + /* The condition below used to include + || (status > 0 && !read_full_records) + This is incorrect since even if new_volume() succeeds, the + subsequent call to rmtread will overwrite the chunk of data + already read in the buffer, so the processing will fail */ + if ((status == 0 + || (status == SAFE_READ_ERROR && errno == ENOSPC)) + && multi_volume_option) + { + while (!try_new_volume ()) + ; + return; + } + else if (status == SAFE_READ_ERROR) + { + archive_read_error (); + continue; + } break; - - case ACCESS_UPDATE: - abort (); } + short_read (status); } -/*-------------------------------------------------------------------------. -| Backspace the archive descriptor by one record worth. If its a tape, | -| MTIOCTOP will work. If its something else, we try to seek on it. If we | -| can't seek, we lose! | -`-------------------------------------------------------------------------*/ - static void -backspace_output (void) +gnu_flush_read (void) { -#ifdef MTIOCTOP - { - struct mtop operation; - - operation.mt_op = MTBSR; - operation.mt_count = 1; - if (rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0) - return; - if (errno == EIO && rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0) - return; - } -#endif - - { - off_t position = rmtlseek (archive, (off_t) 0, 1); - - /* Seek back to the beginning of this record and start writing there. */ - - position -= record_size; - if (rmtlseek (archive, position, 0) != position) - { - /* Lseek failed. Try a different method. */ - - WARN ((0, 0, _("\ -Could not backspace archive file; it may be unreadable without -i"))); - - /* Replace the first part of the record with NULs. */ - - if (record_start->buffer != output_start) - memset (record_start->buffer, 0, - (size_t) (output_start - record_start->buffer)); - } - } + flush_read_ptr = simple_flush_read; /* Avoid recursion */ + _gnu_flush_read (); + flush_read_ptr = gnu_flush_read; } -/*-------------------------. -| Close the archive file. | -`-------------------------*/ - -void -close_archive (void) +static void +_gnu_flush_write (size_t buffer_level) { - if (time_to_start_writing || access_mode == ACCESS_WRITE) - flush_archive (); - -#if !MSDOS - - /* Manage to fully drain a pipe we might be reading, so to not break it on - the producer after the EOF block. FIXME: one of these days, GNU tar - might become clever enough to just stop working, once there is no more - work to do, we might have to revise this area in such time. */ - - if (access_mode == ACCESS_READ && S_ISFIFO (archive_stat.st_mode) && - !ending_file_option) - while (rmtread (archive, record_start->buffer, record_size) > 0) - continue; -#endif + ssize_t status; + union block *header; + char *copy_ptr; + size_t copy_size; + size_t bufsize; - if (subcommand_option == DELETE_SUBCOMMAND) + status = _flush_write (); + if (status != record_size && !multi_volume_option) + archive_write_error (status); + else { - off_t pos; - - pos = rmtlseek (archive, (off_t) 0, 1); -#if MSDOS - rmtwrite (archive, "", 0); -#else - ftruncate (archive, pos); -#endif + records_written++; + bytes_written += status; } - if (verify_option) - verify_volume (); - { - int status = rmtclose (archive); + if (status == record_size) + { + multi_volume_sync (); + return; + } - if (status < 0) - WARN ((0, errno, _("WARNING: Cannot close %s (%d, %d)"), - *archive_name_cursor, archive, status)); - } + /* In multi-volume mode. */ + /* ENXIO is for the UNIX PC. */ + if (status < 0 && errno != ENOSPC && errno != EIO && errno != ENXIO) + archive_write_error (status); -#if !MSDOS + if (!new_volume (ACCESS_WRITE)) + return; - if (child_pid) - { - WAIT_T wait_status; - pid_t child; + xheader_destroy (&extended_header); - /* Loop waiting for the right child to die, or for no more kids. */ + increase_volume_number (); + if (totals_option) + prev_written += bytes_written; + bytes_written = 0; - while ((child = wait (&wait_status), child != child_pid) - && child != -1) - continue; + copy_ptr = record_start->buffer + status; + copy_size = buffer_level - status; + /* Switch to the next buffer */ + record_index = !record_index; + init_buffer (); - if (child != -1) - if (WIFSIGNALED (wait_status) -#if 0 - && !WIFSTOPPED (wait_status) -#endif - ) - { - /* SIGPIPE is OK, everything else is a problem. */ + if (volume_label_option) + add_volume_label (); - if (WTERMSIG (wait_status) != SIGPIPE) - ERROR ((0, 0, _("Child died with signal %d%s"), - WTERMSIG (wait_status), - WCOREDUMP (wait_status) ? _(" (core dumped)") : "")); - } - else - { - /* Child voluntarily terminated -- but why? /bin/sh returns - SIGPIPE + 128 if its child, then do nothing. */ + if (real_s_name) + add_multi_volume_header (); - if (WEXITSTATUS (wait_status) != (SIGPIPE + 128) - && WEXITSTATUS (wait_status)) - ERROR ((0, 0, _("Child returned status %d"), - WEXITSTATUS (wait_status))); - } + write_extended (true, NULL, find_next_block ()); + if (real_s_name) + add_chunk_header (); + header = find_next_block (); + bufsize = available_space_after (header); + while (bufsize < copy_size) + { + memcpy (header->buffer, copy_ptr, bufsize); + copy_ptr += bufsize; + copy_size -= bufsize; + set_next_block_after (header + (bufsize - 1) / BLOCKSIZE); + header = find_next_block (); + bufsize = available_space_after (header); } -#endif /* !MSDOS */ - - if (current_file_name) - free (current_file_name); - if (current_link_name) - free (current_link_name); - if (save_name) - free (save_name); - free (multi_volume_option ? record_start - 2 : record_start); + memcpy (header->buffer, copy_ptr, copy_size); + memset (header->buffer + copy_size, 0, bufsize - copy_size); + set_next_block_after (header + (copy_size - 1) / BLOCKSIZE); + find_next_block (); } -/*------------------------------------------------. -| Called to initialize the global volume number. | -`------------------------------------------------*/ +static void +gnu_flush_write (size_t buffer_level) +{ + flush_write_ptr = simple_flush_write; /* Avoid recursion */ + _gnu_flush_write (buffer_level); + flush_write_ptr = gnu_flush_write; +} void -init_volume_number (void) +flush_read () { - FILE *file = fopen (volno_file_option, "r"); - - if (file) - { - fscanf (file, "%d", &global_volno); - if (fclose (file) == EOF) - ERROR ((0, errno, "%s", volno_file_option)); - } - else if (errno != ENOENT) - ERROR ((0, errno, "%s", volno_file_option)); + flush_read_ptr (); } -/*-------------------------------------------------------. -| Called to write out the closing global volume number. | -`-------------------------------------------------------*/ - void -closeout_volume_number (void) +flush_write () { - FILE *file = fopen (volno_file_option, "w"); - - if (file) - { - fprintf (file, "%d\n", global_volno); - if (fclose (file) == EOF) - ERROR ((0, errno, "%s", volno_file_option)); - } - else - ERROR ((0, errno, "%s", volno_file_option)); + flush_write_ptr (record_size); } -/*-----------------------------------------------------------------------. -| We've hit the end of the old volume. Close it and open the next one. | -| Return nonzero on success. | -`-----------------------------------------------------------------------*/ - -static int -new_volume (enum access_mode access) +void +open_archive (enum access_mode wanted_access) { - static FILE *read_file = NULL; - static int looped = 0; - - int status; - - if (!read_file && !info_script_option) - /* FIXME: if fopen is used, it will never be closed. */ - read_file = archive == STDIN ? fopen (TTY_NAME, "r") : stdin; - - if (now_verifying) - return 0; - if (verify_option) - verify_volume (); - - if (status = rmtclose (archive), status < 0) - WARN ((0, errno, _("WARNING: Cannot close %s (%d, %d)"), - *archive_name_cursor, archive, status)); - - global_volno++; - volno++; - archive_name_cursor++; - if (archive_name_cursor == archive_name_array + archive_names) - { - archive_name_cursor = archive_name_array; - looped = 1; - } + flush_read_ptr = gnu_flush_read; + flush_write_ptr = gnu_flush_write; -tryagain: - if (looped) + _open_archive (wanted_access); + switch (wanted_access) { - /* We have to prompt from now on. */ - - if (info_script_option) - { - if (volno_file_option) - closeout_volume_number (); - system (info_script_option); - } - else - while (1) - { - char input_buffer[80]; - - fprintf (stderr, - _("\007Prepare volume #%d for %s and hit return: "), - global_volno, *archive_name_cursor); - fflush (stderr); - - if (fgets (input_buffer, sizeof (input_buffer), read_file) == 0) - { - fprintf (stderr, _("EOF where user reply was expected")); - - if (subcommand_option != EXTRACT_SUBCOMMAND - && subcommand_option != LIST_SUBCOMMAND - && subcommand_option != DIFF_SUBCOMMAND) - WARN ((0, 0, _("WARNING: Archive is incomplete"))); - - exit (TAREXIT_FAILURE); - } - if (input_buffer[0] == '\n' - || input_buffer[0] == 'y' - || input_buffer[0] == 'Y') - break; - - switch (input_buffer[0]) - { - case '?': - { - fprintf (stderr, _("\ - n [name] Give a new file name for the next (and subsequent) volume(s)\n\ - q Abort tar\n\ - ! Spawn a subshell\n\ - ? Print this list\n")); - } - break; - - case 'q': - /* Quit. */ - - fprintf (stdlis, _("No new volume; exiting.\n")); - - if (subcommand_option != EXTRACT_SUBCOMMAND - && subcommand_option != LIST_SUBCOMMAND - && subcommand_option != DIFF_SUBCOMMAND) - WARN ((0, 0, _("WARNING: Archive is incomplete"))); - - exit (TAREXIT_FAILURE); - - case 'n': - /* Get new file name. */ - - { - char *name = &input_buffer[1]; - char *cursor; - - while (*name == ' ' || *name == '\t') - name++; - cursor = name; - while (*cursor && *cursor != '\n') - cursor++; - *cursor = '\0'; - - /* FIXME: the following allocation is never reclaimed. */ - *archive_name_cursor = xstrdup (name); - } - break; - - case '!': -#if MSDOS - spawnl (P_WAIT, getenv ("COMSPEC"), "-", 0); -#else /* not MSDOS */ - switch (fork ()) - { - case -1: - WARN ((0, errno, _("Cannot fork!"))); - break; - - case 0: - { - const char *shell = getenv ("SHELL"); - - if (shell == NULL) - shell = "/bin/sh"; - execlp (shell, "-sh", "-i", 0); - FATAL_ERROR ((0, errno, _("Cannot exec a shell %s"), - shell)); - } - - default: - { - WAIT_T wait_status; - - wait (&wait_status); - } - break; - } - - /* FIXME: I'm not sure if that's all that has to be done - here. (jk) */ - -#endif /* not MSDOS */ - break; - } - } - } - - if (verify_option) - archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, 0666, - rsh_command_option); - else - switch (access) - { - case ACCESS_READ: - archive = rmtopen (*archive_name_cursor, O_RDONLY, 0666, - rsh_command_option); - break; - - case ACCESS_WRITE: - if (backup_option) - maybe_backup_file (*archive_name_cursor, 1); - archive = rmtcreat (*archive_name_cursor, 0666, rsh_command_option); - break; + case ACCESS_READ: + if (volume_label_option) + match_volume_label (); + break; - case ACCESS_UPDATE: - archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, 0666, - rsh_command_option); - break; - } + case ACCESS_WRITE: + records_written = 0; + if (volume_label_option) + write_volume_label (); + break; - if (archive < 0) - { - WARN ((0, errno, _("Cannot open %s"), *archive_name_cursor)); - if (!verify_option && access == ACCESS_WRITE && backup_option) - undo_last_backup (); - goto tryagain; + default: + break; } - -#if MSDOS - setmode (archive, O_BINARY); -#endif - - return 1; }