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Diffstat (limited to 'contrib/tar/src/list.c')
| -rw-r--r-- | contrib/tar/src/list.c | 1191 |
1 files changed, 1191 insertions, 0 deletions
diff --git a/contrib/tar/src/list.c b/contrib/tar/src/list.c new file mode 100644 index 0000000..e88d53b --- /dev/null +++ b/contrib/tar/src/list.c @@ -0,0 +1,1191 @@ +/* List a tar archive, with support routines for reading a tar archive. + + Copyright 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, + 2001 Free Software Foundation, Inc. + + Written by John Gilmore, on 1985-08-26. + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any later + version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General + Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Define to non-zero for forcing old ctime format instead of ISO format. */ +#undef USE_OLD_CTIME + +#include "system.h" +#include <quotearg.h> + +#include "common.h" + +#define max(a, b) ((a) < (b) ? (b) : (a)) + +union block *current_header; /* points to current archive header */ +struct stat current_stat; /* stat struct corresponding */ +enum archive_format current_format; /* recognized format */ +union block *recent_long_name; /* recent long name header and contents */ +union block *recent_long_link; /* likewise, for long link */ +size_t recent_long_name_blocks; /* number of blocks in recent_long_name */ +size_t recent_long_link_blocks; /* likewise, for long link */ + +static uintmax_t from_header PARAMS ((const char *, size_t, const char *, + uintmax_t, uintmax_t)); + +/* Base 64 digits; see Internet RFC 2045 Table 1. */ +static char const base_64_digits[64] = +{ + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', + 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', + 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', + 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' +}; + +/* Table of base-64 digit values indexed by unsigned chars. + The value is 64 for unsigned chars that are not base-64 digits. */ +static char base64_map[UCHAR_MAX + 1]; + +static void +base64_init (void) +{ + int i; + memset (base64_map, 64, sizeof base64_map); + for (i = 0; i < 64; i++) + base64_map[(int) base_64_digits[i]] = i; +} + +/* Main loop for reading an archive. */ +void +read_and (void (*do_something) ()) +{ + enum read_header status = HEADER_STILL_UNREAD; + enum read_header prev_status; + + base64_init (); + name_gather (); + open_archive (ACCESS_READ); + + while (1) + { + prev_status = status; + status = read_header (0); + switch (status) + { + case HEADER_STILL_UNREAD: + abort (); + + case HEADER_SUCCESS: + + /* Valid header. We should decode next field (mode) first. + Ensure incoming names are null terminated. */ + + if (! name_match (current_file_name) + || (newer_mtime_option != TYPE_MINIMUM (time_t) + /* FIXME: We get mtime now, and again later; this causes + duplicate diagnostics if header.mtime is bogus. */ + && ((current_stat.st_mtime + = TIME_FROM_HEADER (current_header->header.mtime)) + < newer_mtime_option)) + || excluded_name (current_file_name)) + { + switch (current_header->header.typeflag) + { + case GNUTYPE_VOLHDR: + case GNUTYPE_MULTIVOL: + case GNUTYPE_NAMES: + break; + + case DIRTYPE: + if (show_omitted_dirs_option) + WARN ((0, 0, _("%s: Omitting"), + quotearg_colon (current_file_name))); + /* Fall through. */ + default: + skip_member (); + continue; + } + } + + (*do_something) (); + continue; + + case HEADER_ZERO_BLOCK: + if (block_number_option) + { + char buf[UINTMAX_STRSIZE_BOUND]; + fprintf (stdlis, _("block %s: ** Block of NULs **\n"), + STRINGIFY_BIGINT (current_block_ordinal (), buf)); + } + + set_next_block_after (current_header); + status = prev_status; + if (ignore_zeros_option) + continue; + break; + + case HEADER_END_OF_FILE: + if (block_number_option) + { + char buf[UINTMAX_STRSIZE_BOUND]; + fprintf (stdlis, _("block %s: ** End of File **\n"), + STRINGIFY_BIGINT (current_block_ordinal (), buf)); + } + break; + + case HEADER_FAILURE: + /* If the previous header was good, tell them that we are + skipping bad ones. */ + set_next_block_after (current_header); + switch (prev_status) + { + case HEADER_STILL_UNREAD: + ERROR ((0, 0, _("This does not look like a tar archive"))); + /* Fall through. */ + + case HEADER_ZERO_BLOCK: + case HEADER_SUCCESS: + ERROR ((0, 0, _("Skipping to next header"))); + break; + + case HEADER_END_OF_FILE: + case HEADER_FAILURE: + /* We are in the middle of a cascade of errors. */ + break; + } + continue; + } + break; + } + + close_archive (); + names_notfound (); /* print names not found */ +} + +/* Print a header block, based on tar options. */ +void +list_archive (void) +{ + /* Print the header block. */ + + if (verbose_option) + { + if (verbose_option > 1) + decode_header (current_header, ¤t_stat, ¤t_format, 0); + print_header (); + } + + if (incremental_option && current_header->header.typeflag == GNUTYPE_DUMPDIR) + { + off_t size; + size_t written, check; + union block *data_block; + + set_next_block_after (current_header); + if (multi_volume_option) + { + assign_string (&save_name, current_file_name); + save_totsize = current_stat.st_size; + } + for (size = current_stat.st_size; size > 0; size -= written) + { + if (multi_volume_option) + save_sizeleft = size; + data_block = find_next_block (); + if (!data_block) + { + ERROR ((0, 0, _("Unexpected EOF in archive"))); + break; /* FIXME: What happens, then? */ + } + written = available_space_after (data_block); + if (written > size) + written = size; + errno = 0; + check = fwrite (data_block->buffer, sizeof (char), written, stdlis); + set_next_block_after ((union block *) + (data_block->buffer + written - 1)); + if (check != written) + { + write_error_details (current_file_name, check, written); + skip_file (size - written); + break; + } + } + if (multi_volume_option) + assign_string (&save_name, 0); + fputc ('\n', stdlis); + fflush (stdlis); + return; + + } + + if (multi_volume_option) + assign_string (&save_name, current_file_name); + + skip_member (); + + if (multi_volume_option) + assign_string (&save_name, 0); +} + +/* Read a block that's supposed to be a header block. Return its + address in "current_header", and if it is good, the file's size in + current_stat.st_size. + + Return 1 for success, 0 if the checksum is bad, EOF on eof, 2 for a + block full of zeros (EOF marker). + + If RAW_EXTENDED_HEADERS is nonzero, do not automagically fold the + GNU long name and link headers into later headers. + + You must always set_next_block_after(current_header) to skip past + the header which this routine reads. */ + +/* The standard BSD tar sources create the checksum by adding up the + bytes in the header as type char. I think the type char was unsigned + on the PDP-11, but it's signed on the Next and Sun. It looks like the + sources to BSD tar were never changed to compute the checksum + correctly, so both the Sun and Next add the bytes of the header as + signed chars. This doesn't cause a problem until you get a file with + a name containing characters with the high bit set. So read_header + computes two checksums -- signed and unsigned. */ + +enum read_header +read_header (bool raw_extended_headers) +{ + size_t i; + int unsigned_sum; /* the POSIX one :-) */ + int signed_sum; /* the Sun one :-( */ + int recorded_sum; + uintmax_t parsed_sum; + char *p; + union block *header; + union block *header_copy; + char *bp; + union block *data_block; + size_t size, written; + union block *next_long_name = 0; + union block *next_long_link = 0; + size_t next_long_name_blocks; + size_t next_long_link_blocks; + + while (1) + { + header = find_next_block (); + current_header = header; + if (!header) + return HEADER_END_OF_FILE; + + unsigned_sum = 0; + signed_sum = 0; + p = header->buffer; + for (i = sizeof *header; i-- != 0;) + { + unsigned_sum += (unsigned char) *p; + signed_sum += (signed char) (*p++); + } + + if (unsigned_sum == 0) + return HEADER_ZERO_BLOCK; + + /* Adjust checksum to count the "chksum" field as blanks. */ + + for (i = sizeof header->header.chksum; i-- != 0;) + { + unsigned_sum -= (unsigned char) header->header.chksum[i]; + signed_sum -= (signed char) (header->header.chksum[i]); + } + unsigned_sum += ' ' * sizeof header->header.chksum; + signed_sum += ' ' * sizeof header->header.chksum; + + parsed_sum = from_header (header->header.chksum, + sizeof header->header.chksum, 0, + (uintmax_t) 0, + (uintmax_t) TYPE_MAXIMUM (int)); + if (parsed_sum == (uintmax_t) -1) + return HEADER_FAILURE; + + recorded_sum = parsed_sum; + + if (unsigned_sum != recorded_sum && signed_sum != recorded_sum) + return HEADER_FAILURE; + + /* Good block. Decode file size and return. */ + + if (header->header.typeflag == LNKTYPE) + current_stat.st_size = 0; /* links 0 size on tape */ + else + current_stat.st_size = OFF_FROM_HEADER (header->header.size); + + if (header->header.typeflag == GNUTYPE_LONGNAME + || header->header.typeflag == GNUTYPE_LONGLINK) + { + if (raw_extended_headers) + return HEADER_SUCCESS_EXTENDED; + else + { + size_t name_size = current_stat.st_size; + size = name_size - name_size % BLOCKSIZE + 2 * BLOCKSIZE; + if (name_size != current_stat.st_size || size < name_size) + xalloc_die (); + } + + header_copy = xmalloc (size + 1); + + if (header->header.typeflag == GNUTYPE_LONGNAME) + { + if (next_long_name) + free (next_long_name); + next_long_name = header_copy; + next_long_name_blocks = size / BLOCKSIZE; + } + else + { + if (next_long_link) + free (next_long_link); + next_long_link = header_copy; + next_long_link_blocks = size / BLOCKSIZE; + } + + set_next_block_after (header); + *header_copy = *header; + bp = header_copy->buffer + BLOCKSIZE; + + for (size -= BLOCKSIZE; size > 0; size -= written) + { + data_block = find_next_block (); + if (! data_block) + { + ERROR ((0, 0, _("Unexpected EOF in archive"))); + break; + } + written = available_space_after (data_block); + if (written > size) + written = size; + + memcpy (bp, data_block->buffer, written); + bp += written; + set_next_block_after ((union block *) + (data_block->buffer + written - 1)); + } + + *bp = '\0'; + + /* Loop! */ + + } + else + { + char const *name; + struct posix_header const *h = ¤t_header->header; + char namebuf[sizeof h->prefix + 1 + NAME_FIELD_SIZE + 1]; + + if (recent_long_name) + free (recent_long_name); + + if (next_long_name) + { + name = next_long_name->buffer + BLOCKSIZE; + recent_long_name = next_long_name; + recent_long_name_blocks = next_long_name_blocks; + } + else + { + /* Accept file names as specified by POSIX.1-1996 + section 10.1.1. */ + char *np = namebuf; + + if (h->prefix[0] && strcmp (h->magic, TMAGIC) == 0) + { + memcpy (np, h->prefix, sizeof h->prefix); + np[sizeof h->prefix] = '\0'; + np += strlen (np); + *np++ = '/'; + + /* Prevent later references to current_header from + mistakenly treating this as an old GNU header. + This assignment invalidates h->prefix. */ + current_header->oldgnu_header.isextended = 0; + } + memcpy (np, h->name, sizeof h->name); + np[sizeof h->name] = '\0'; + name = namebuf; + recent_long_name = 0; + recent_long_name_blocks = 0; + } + assign_string (¤t_file_name, name); + + if (recent_long_link) + free (recent_long_link); + + if (next_long_link) + { + name = next_long_link->buffer + BLOCKSIZE; + recent_long_link = next_long_link; + recent_long_link_blocks = next_long_link_blocks; + } + else + { + memcpy (namebuf, h->linkname, sizeof h->linkname); + namebuf[sizeof h->linkname] = '\0'; + name = namebuf; + recent_long_link = 0; + recent_long_link_blocks = 0; + } + assign_string (¤t_link_name, name); + + return HEADER_SUCCESS; + } + } +} + +/* Decode things from a file HEADER block into STAT_INFO, also setting + *FORMAT_POINTER depending on the header block format. If + DO_USER_GROUP, decode the user/group information (this is useful + for extraction, but waste time when merely listing). + + read_header() has already decoded the checksum and length, so we don't. + + This routine should *not* be called twice for the same block, since + the two calls might use different DO_USER_GROUP values and thus + might end up with different uid/gid for the two calls. If anybody + wants the uid/gid they should decode it first, and other callers + should decode it without uid/gid before calling a routine, + e.g. print_header, that assumes decoded data. */ +void +decode_header (union block *header, struct stat *stat_info, + enum archive_format *format_pointer, int do_user_group) +{ + enum archive_format format; + + if (strcmp (header->header.magic, TMAGIC) == 0) + format = POSIX_FORMAT; + else if (strcmp (header->header.magic, OLDGNU_MAGIC) == 0) + format = OLDGNU_FORMAT; + else + format = V7_FORMAT; + *format_pointer = format; + + stat_info->st_mode = MODE_FROM_HEADER (header->header.mode); + stat_info->st_mtime = TIME_FROM_HEADER (header->header.mtime); + + if (format == OLDGNU_FORMAT && incremental_option) + { + stat_info->st_atime = TIME_FROM_HEADER (header->oldgnu_header.atime); + stat_info->st_ctime = TIME_FROM_HEADER (header->oldgnu_header.ctime); + } + + if (format == V7_FORMAT) + { + stat_info->st_uid = UID_FROM_HEADER (header->header.uid); + stat_info->st_gid = GID_FROM_HEADER (header->header.gid); + stat_info->st_rdev = 0; + } + else + { + if (do_user_group) + { + /* FIXME: Decide if this should somewhat depend on -p. */ + + if (numeric_owner_option + || !*header->header.uname + || !uname_to_uid (header->header.uname, &stat_info->st_uid)) + stat_info->st_uid = UID_FROM_HEADER (header->header.uid); + + if (numeric_owner_option + || !*header->header.gname + || !gname_to_gid (header->header.gname, &stat_info->st_gid)) + stat_info->st_gid = GID_FROM_HEADER (header->header.gid); + } + switch (header->header.typeflag) + { + case BLKTYPE: + stat_info->st_rdev + = makedev (MAJOR_FROM_HEADER (header->header.devmajor), + MINOR_FROM_HEADER (header->header.devminor)); + break; + + case CHRTYPE: + stat_info->st_rdev + = makedev (MAJOR_FROM_HEADER (header->header.devmajor), + MINOR_FROM_HEADER (header->header.devminor)); + break; + + default: + stat_info->st_rdev = 0; + } + } +} + +/* Convert buffer at WHERE0 of size DIGS from external format to + uintmax_t. The data is of type TYPE. The buffer must represent a + value in the range -MINUS_MINVAL through MAXVAL. DIGS must be + positive. Return -1 on error, diagnosing the error if TYPE is + nonzero. */ +static uintmax_t +from_header (char const *where0, size_t digs, char const *type, + uintmax_t minus_minval, uintmax_t maxval) +{ + uintmax_t value; + char const *where = where0; + char const *lim = where + digs; + int negative = 0; + + /* Accommodate buggy tar of unknown vintage, which outputs leading + NUL if the previous field overflows. */ + where += !*where; + + /* Accommodate older tars, which output leading spaces. */ + for (;;) + { + if (where == lim) + { + if (type) + ERROR ((0, 0, + _("Blanks in header where numeric %s value expected"), + type)); + return -1; + } + if (!ISSPACE ((unsigned char) *where)) + break; + where++; + } + + value = 0; + if (ISODIGIT (*where)) + { + char const *where1 = where; + uintmax_t overflow = 0; + + for (;;) + { + value += *where++ - '0'; + if (where == lim || ! ISODIGIT (*where)) + break; + overflow |= value ^ (value << LG_8 >> LG_8); + value <<= LG_8; + } + + /* Parse the output of older, unportable tars, which generate + negative values in two's complement octal. If the leading + nonzero digit is 1, we can't recover the original value + reliably; so do this only if the digit is 2 or more. This + catches the common case of 32-bit negative time stamps. */ + if ((overflow || maxval < value) && '2' <= *where1 && type) + { + /* Compute the negative of the input value, assuming two's + complement. */ + int digit = (*where1 - '0') | 4; + overflow = 0; + value = 0; + where = where1; + for (;;) + { + value += 7 - digit; + where++; + if (where == lim || ! ISODIGIT (*where)) + break; + digit = *where - '0'; + overflow |= value ^ (value << LG_8 >> LG_8); + value <<= LG_8; + } + value++; + overflow |= !value; + + if (!overflow && value <= minus_minval) + { + WARN ((0, 0, + _("Archive octal value %.*s is out of %s range; assuming two's complement"), + (int) (where - where1), where1, type)); + negative = 1; + } + } + + if (overflow) + { + if (type) + ERROR ((0, 0, + _("Archive octal value %.*s is out of %s range"), + (int) (where - where1), where1, type)); + return -1; + } + } + else if (*where == '-' || *where == '+') + { + /* Parse base-64 output produced only by tar test versions + 1.13.6 (1999-08-11) through 1.13.11 (1999-08-23). + Support for this will be withdrawn in future releases. */ + int dig; + static int warned_once; + if (! warned_once) + { + warned_once = 1; + WARN ((0, 0, + _("Archive contains obsolescent base-64 headers"))); + } + negative = *where++ == '-'; + while (where != lim + && (dig = base64_map[(unsigned char) *where]) < 64) + { + if (value << LG_64 >> LG_64 != value) + { + char *string = alloca (digs + 1); + memcpy (string, where0, digs); + string[digs] = '\0'; + if (type) + ERROR ((0, 0, + _("Archive signed base-64 string %s is out of %s range"), + quote (string), type)); + return -1; + } + value = (value << LG_64) | dig; + where++; + } + } + else if (*where == '\200' /* positive base-256 */ + || *where == '\377' /* negative base-256 */) + { + /* Parse base-256 output. A nonnegative number N is + represented as (256**DIGS)/2 + N; a negative number -N is + represented as (256**DIGS) - N, i.e. as two's complement. + The representation guarantees that the leading bit is + always on, so that we don't confuse this format with the + others (assuming ASCII bytes of 8 bits or more). */ + int signbit = *where & (1 << (LG_256 - 2)); + uintmax_t topbits = (((uintmax_t) - signbit) + << (CHAR_BIT * sizeof (uintmax_t) + - LG_256 - (LG_256 - 2))); + value = (*where++ & ((1 << (LG_256 - 2)) - 1)) - signbit; + for (;;) + { + value = (value << LG_256) + (unsigned char) *where++; + if (where == lim) + break; + if (((value << LG_256 >> LG_256) | topbits) != value) + { + if (type) + ERROR ((0, 0, + _("Archive base-256 value is out of %s range"), + type)); + return -1; + } + } + negative = signbit; + if (negative) + value = -value; + } + + if (where != lim && *where && !ISSPACE ((unsigned char) *where)) + { + if (type) + { + char buf[1000]; /* Big enough to represent any header. */ + static struct quoting_options *o; + + if (!o) + { + o = clone_quoting_options (0); + set_quoting_style (o, locale_quoting_style); + } + + while (where0 != lim && ! lim[-1]) + lim--; + quotearg_buffer (buf, sizeof buf, where0, lim - where, o); + ERROR ((0, 0, + _("Archive contains %.*s where numeric %s value expected"), + (int) sizeof buf, buf, type)); + } + + return -1; + } + + if (value <= (negative ? minus_minval : maxval)) + return negative ? -value : value; + + if (type) + { + char minval_buf[UINTMAX_STRSIZE_BOUND + 1]; + char maxval_buf[UINTMAX_STRSIZE_BOUND]; + char value_buf[UINTMAX_STRSIZE_BOUND + 1]; + char *minval_string = STRINGIFY_BIGINT (minus_minval, minval_buf + 1); + char *value_string = STRINGIFY_BIGINT (value, value_buf + 1); + if (negative) + *--value_string = '-'; + if (minus_minval) + *--minval_string = '-'; + ERROR ((0, 0, _("Archive value %s is out of %s range %s..%s"), + value_string, type, + minval_string, STRINGIFY_BIGINT (maxval, maxval_buf))); + } + + return -1; +} + +gid_t +gid_from_header (const char *p, size_t s) +{ + return from_header (p, s, "gid_t", + - (uintmax_t) TYPE_MINIMUM (gid_t), + (uintmax_t) TYPE_MAXIMUM (gid_t)); +} + +major_t +major_from_header (const char *p, size_t s) +{ + return from_header (p, s, "major_t", + - (uintmax_t) TYPE_MINIMUM (major_t), + (uintmax_t) TYPE_MAXIMUM (major_t)); +} + +minor_t +minor_from_header (const char *p, size_t s) +{ + return from_header (p, s, "minor_t", + - (uintmax_t) TYPE_MINIMUM (minor_t), + (uintmax_t) TYPE_MAXIMUM (minor_t)); +} + +mode_t +mode_from_header (const char *p, size_t s) +{ + /* Do not complain about unrecognized mode bits. */ + unsigned u = from_header (p, s, "mode_t", + - (uintmax_t) TYPE_MINIMUM (mode_t), + TYPE_MAXIMUM (uintmax_t)); + return ((u & TSUID ? S_ISUID : 0) + | (u & TSGID ? S_ISGID : 0) + | (u & TSVTX ? S_ISVTX : 0) + | (u & TUREAD ? S_IRUSR : 0) + | (u & TUWRITE ? S_IWUSR : 0) + | (u & TUEXEC ? S_IXUSR : 0) + | (u & TGREAD ? S_IRGRP : 0) + | (u & TGWRITE ? S_IWGRP : 0) + | (u & TGEXEC ? S_IXGRP : 0) + | (u & TOREAD ? S_IROTH : 0) + | (u & TOWRITE ? S_IWOTH : 0) + | (u & TOEXEC ? S_IXOTH : 0)); +} + +off_t +off_from_header (const char *p, size_t s) +{ + /* Negative offsets are not allowed in tar files, so invoke + from_header with minimum value 0, not TYPE_MINIMUM (off_t). */ + return from_header (p, s, "off_t", (uintmax_t) 0, + (uintmax_t) TYPE_MAXIMUM (off_t)); +} + +size_t +size_from_header (const char *p, size_t s) +{ + return from_header (p, s, "size_t", (uintmax_t) 0, + (uintmax_t) TYPE_MAXIMUM (size_t)); +} + +time_t +time_from_header (const char *p, size_t s) +{ + return from_header (p, s, "time_t", + - (uintmax_t) TYPE_MINIMUM (time_t), + (uintmax_t) TYPE_MAXIMUM (time_t)); +} + +uid_t +uid_from_header (const char *p, size_t s) +{ + return from_header (p, s, "uid_t", + - (uintmax_t) TYPE_MINIMUM (uid_t), + (uintmax_t) TYPE_MAXIMUM (uid_t)); +} + +uintmax_t +uintmax_from_header (const char *p, size_t s) +{ + return from_header (p, s, "uintmax_t", (uintmax_t) 0, + TYPE_MAXIMUM (uintmax_t)); +} + + +/* Format O as a null-terminated decimal string into BUF _backwards_; + return pointer to start of result. */ +char * +stringify_uintmax_t_backwards (uintmax_t o, char *buf) +{ + *--buf = '\0'; + do + *--buf = '0' + (int) (o % 10); + while ((o /= 10) != 0); + return buf; +} + +/* Return a printable representation of T. The result points to + static storage that can be reused in the next call to this + function, to ctime, or to asctime. */ +char const * +tartime (time_t t) +{ + static char buffer[max (UINTMAX_STRSIZE_BOUND + 1, + INT_STRLEN_BOUND (int) + 16)]; + char *p; + +#if USE_OLD_CTIME + p = ctime (&t); + if (p) + { + char const *time_stamp = p + 4; + for (p += 16; p[3] != '\n'; p++) + p[0] = p[3]; + p[0] = '\0'; + return time_stamp; + } +#else + /* Use ISO 8610 format. See: + http://www.cl.cam.ac.uk/~mgk25/iso-time.html */ + struct tm *tm = localtime (&t); + if (tm) + { + sprintf (buffer, "%04d-%02d-%02d %02d:%02d:%02d", + tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + return buffer; + } +#endif + + /* The time stamp cannot be broken down, most likely because it + is out of range. Convert it as an integer, + right-adjusted in a field with the same width as the usual + 19-byte 4-year ISO time format. */ + p = stringify_uintmax_t_backwards (t < 0 ? - (uintmax_t) t : (uintmax_t) t, + buffer + sizeof buffer); + if (t < 0) + *--p = '-'; + while (buffer + sizeof buffer - 19 - 1 < p) + *--p = ' '; + return p; +} + +/* Actually print it. + + Plain and fancy file header block logging. Non-verbose just prints + the name, e.g. for "tar t" or "tar x". This should just contain + file names, so it can be fed back into tar with xargs or the "-T" + option. The verbose option can give a bunch of info, one line per + file. I doubt anybody tries to parse its format, or if they do, + they shouldn't. Unix tar is pretty random here anyway. */ + + +/* FIXME: Note that print_header uses the globals HEAD, HSTAT, and + HEAD_STANDARD, which must be set up in advance. Not very clean... */ + +/* UGSWIDTH starts with 18, so with user and group names <= 8 chars, the + columns never shift during the listing. */ +#define UGSWIDTH 18 +static int ugswidth = UGSWIDTH; /* maximum width encountered so far */ + +/* DATEWIDTH is the number of columns taken by the date and time fields. */ +#if USE_OLD_CDATE +# define DATEWIDTH 19 +#else +# define DATEWIDTH 18 +#endif + +void +print_header (void) +{ + char modes[11]; + char const *time_stamp; + /* These hold formatted ints. */ + char uform[UINTMAX_STRSIZE_BOUND], gform[UINTMAX_STRSIZE_BOUND]; + char *user, *group; + char size[2 * UINTMAX_STRSIZE_BOUND]; + /* holds formatted size or major,minor */ + char uintbuf[UINTMAX_STRSIZE_BOUND]; + int pad; + + if (block_number_option) + { + char buf[UINTMAX_STRSIZE_BOUND]; + fprintf (stdlis, _("block %s: "), + STRINGIFY_BIGINT (current_block_ordinal (), buf)); + } + + if (verbose_option <= 1) + { + /* Just the fax, mam. */ + fprintf (stdlis, "%s\n", quotearg (current_file_name)); + } + else + { + /* File type and modes. */ + + modes[0] = '?'; + switch (current_header->header.typeflag) + { + case GNUTYPE_VOLHDR: + modes[0] = 'V'; + break; + + case GNUTYPE_MULTIVOL: + modes[0] = 'M'; + break; + + case GNUTYPE_NAMES: + modes[0] = 'N'; + break; + + case GNUTYPE_LONGNAME: + case GNUTYPE_LONGLINK: + ERROR ((0, 0, _("Visible longname error"))); + break; + + case GNUTYPE_SPARSE: + case REGTYPE: + case AREGTYPE: + case LNKTYPE: + modes[0] = '-'; + if (current_file_name[strlen (current_file_name) - 1] == '/') + modes[0] = 'd'; + break; + case GNUTYPE_DUMPDIR: + modes[0] = 'd'; + break; + case DIRTYPE: + modes[0] = 'd'; + break; + case SYMTYPE: + modes[0] = 'l'; + break; + case BLKTYPE: + modes[0] = 'b'; + break; + case CHRTYPE: + modes[0] = 'c'; + break; + case FIFOTYPE: + modes[0] = 'p'; + break; + case CONTTYPE: + modes[0] = 'C'; + break; + } + + decode_mode (current_stat.st_mode, modes + 1); + + /* Time stamp. */ + + time_stamp = tartime (current_stat.st_mtime); + + /* User and group names. */ + + if (*current_header->header.uname && current_format != V7_FORMAT + && !numeric_owner_option) + user = current_header->header.uname; + else + { + /* Try parsing it as an unsigned integer first, and as a + uid_t if that fails. This method can list positive user + ids that are too large to fit in a uid_t. */ + uintmax_t u = from_header (current_header->header.uid, + sizeof current_header->header.uid, 0, + (uintmax_t) 0, + (uintmax_t) TYPE_MAXIMUM (uintmax_t)); + if (u != -1) + user = STRINGIFY_BIGINT (u, uform); + else + { + sprintf (uform, "%ld", + (long) UID_FROM_HEADER (current_header->header.uid)); + user = uform; + } + } + + if (*current_header->header.gname && current_format != V7_FORMAT + && !numeric_owner_option) + group = current_header->header.gname; + else + { + /* Try parsing it as an unsigned integer first, and as a + gid_t if that fails. This method can list positive group + ids that are too large to fit in a gid_t. */ + uintmax_t g = from_header (current_header->header.gid, + sizeof current_header->header.gid, 0, + (uintmax_t) 0, + (uintmax_t) TYPE_MAXIMUM (uintmax_t)); + if (g != -1) + group = STRINGIFY_BIGINT (g, gform); + else + { + sprintf (gform, "%ld", + (long) GID_FROM_HEADER (current_header->header.gid)); + group = gform; + } + } + + /* Format the file size or major/minor device numbers. */ + + switch (current_header->header.typeflag) + { + case CHRTYPE: + case BLKTYPE: + strcpy (size, + STRINGIFY_BIGINT (major (current_stat.st_rdev), uintbuf)); + strcat (size, ","); + strcat (size, + STRINGIFY_BIGINT (minor (current_stat.st_rdev), uintbuf)); + break; + case GNUTYPE_SPARSE: + strcpy (size, + STRINGIFY_BIGINT + (UINTMAX_FROM_HEADER (current_header + ->oldgnu_header.realsize), + uintbuf)); + break; + default: + strcpy (size, STRINGIFY_BIGINT (current_stat.st_size, uintbuf)); + break; + } + + /* Figure out padding and print the whole line. */ + + pad = strlen (user) + strlen (group) + strlen (size) + 1; + if (pad > ugswidth) + ugswidth = pad; + + fprintf (stdlis, "%s %s/%s %*s%s %s", + modes, user, group, ugswidth - pad, "", size, time_stamp); + + fprintf (stdlis, " %s", quotearg (current_file_name)); + + switch (current_header->header.typeflag) + { + case SYMTYPE: + fprintf (stdlis, " -> %s\n", quotearg (current_link_name)); + break; + + case LNKTYPE: + fprintf (stdlis, _(" link to %s\n"), quotearg (current_link_name)); + break; + + default: + { + char type_string[2]; + type_string[0] = current_header->header.typeflag; + type_string[1] = '\0'; + fprintf (stdlis, _(" unknown file type %s\n"), + quote (type_string)); + } + break; + + case AREGTYPE: + case REGTYPE: + case GNUTYPE_SPARSE: + case CHRTYPE: + case BLKTYPE: + case DIRTYPE: + case FIFOTYPE: + case CONTTYPE: + case GNUTYPE_DUMPDIR: + putc ('\n', stdlis); + break; + + case GNUTYPE_VOLHDR: + fprintf (stdlis, _("--Volume Header--\n")); + break; + + case GNUTYPE_MULTIVOL: + strcpy (size, + STRINGIFY_BIGINT + (UINTMAX_FROM_HEADER (current_header->oldgnu_header.offset), + uintbuf)); + fprintf (stdlis, _("--Continued at byte %s--\n"), size); + break; + + case GNUTYPE_NAMES: + fprintf (stdlis, _("--Mangled file names--\n")); + break; + } + } + fflush (stdlis); +} + +/* Print a similar line when we make a directory automatically. */ +void +print_for_mkdir (char *pathname, int length, mode_t mode) +{ + char modes[11]; + + if (verbose_option > 1) + { + /* File type and modes. */ + + modes[0] = 'd'; + decode_mode (mode, modes + 1); + + if (block_number_option) + { + char buf[UINTMAX_STRSIZE_BOUND]; + fprintf (stdlis, _("block %s: "), + STRINGIFY_BIGINT (current_block_ordinal (), buf)); + } + + fprintf (stdlis, "%s %*s %.*s\n", modes, ugswidth + DATEWIDTH, + _("Creating directory:"), length, quotearg (pathname)); + } +} + +/* Skip over SIZE bytes of data in blocks in the archive. */ +void +skip_file (off_t size) +{ + union block *x; + + if (multi_volume_option) + { + save_totsize = size; + save_sizeleft = size; + } + + while (size > 0) + { + x = find_next_block (); + if (! x) + FATAL_ERROR ((0, 0, _("Unexpected EOF in archive"))); + + set_next_block_after (x); + size -= BLOCKSIZE; + if (multi_volume_option) + save_sizeleft -= BLOCKSIZE; + } +} + +/* Skip the current member in the archive. */ +void +skip_member (void) +{ + char save_typeflag = current_header->header.typeflag; + set_next_block_after (current_header); + + if (current_header->oldgnu_header.isextended) + { + union block *exhdr; + do + { + exhdr = find_next_block (); + if (!exhdr) + FATAL_ERROR ((0, 0, _("Unexpected EOF in archive"))); + set_next_block_after (exhdr); + } + while (exhdr->sparse_header.isextended); + } + + if (save_typeflag != DIRTYPE) + skip_file (current_stat.st_size); +} |
