From e4e624848b53ac02f1212af2209a63d28e40afec Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Wed, 22 Sep 1999 06:14:23 +0000 Subject: [PATCH] (time): Declare if not defined. (base_64_digits): Moved here from create.c. (base64_map): Use UCHAR_MAX for size, not less-clear (unsigned char) -1. (read_and): Don't get time from header unless we need it now; as getting time can cause duplicate diagnostics if bogus. Remove "Hmm, " from diagnostic. Use "Skipping to next header" uniformly. (from_header): Renamed from from_chars. All uses changed. Allow different forms for unportable 2's complement numbers. Don't check for extended forms when parsing checksums. Parse base-256 output. (gid_from_header): Renamed from gid_from_chars. All uses changed. (major_from_header): Renamed from major_from_chars. All uses changed. (minor_from_header): Renamed from minor_from_chars. All uses changed. (mode_from_header): Renamed from mode_from_chars. All uses changed. (off_from_header): Renamed from off_from_chars. All uses changed. (size_from_header): Renamed from size_from_chars. All uses changed. (time_from_header): Renamed from time_from_chars. All uses changed. Warn about future timestamps. (uid_from_header): Renamed from uid_from_chars. All uses changed. (uintmax_from_header): Renamed from uintmax_from_chars. All uses changed. (tartime): New function, incorporating isotime. (isotime): Delete. (print_header): Use tartime. --- src/list.c | 364 ++++++++++++++++++++++++++++++++--------------------- 1 file changed, 222 insertions(+), 142 deletions(-) diff --git a/src/list.c b/src/list.c index 5067a86..396d83a 100644 --- a/src/list.c +++ b/src/list.c @@ -16,13 +16,16 @@ 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() instead of isotime(). */ +/* Define to non-zero for forcing old ctime format instead of ISO format. */ #undef USE_OLD_CTIME #include "system.h" #include #include +#ifndef time +time_t time (); +#endif #include "common.h" @@ -32,12 +35,23 @@ union block *current_header; /* points to current archive header */ struct stat current_stat; /* stat struct corresponding */ enum archive_format current_format; /* recognized format */ -static uintmax_t from_chars PARAMS ((const char *, size_t, const char *, - uintmax_t, uintmax_t)); +static char const *tartime PARAMS ((time_t)); +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[1 + (unsigned char) -1]; +/* 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) @@ -76,12 +90,14 @@ read_and (void (*do_something) ()) /* Valid header. We should decode next field (mode) first. Ensure incoming names are null terminated. */ - /* FIXME: This is a quick kludge before 1.12 goes out. */ - current_stat.st_mtime - = TIME_FROM_CHARS (current_header->header.mtime); - if (!name_match (current_file_name) - || current_stat.st_mtime < newer_mtime_option + || (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)) { char save_typeflag; @@ -144,12 +160,12 @@ read_and (void (*do_something) ()) switch (prev_status) { case HEADER_STILL_UNREAD: - WARN ((0, 0, _("Hmm, this doesn't look like a tar archive"))); + WARN ((0, 0, _("This does not look like a tar archive"))); /* Fall through. */ case HEADER_ZERO_BLOCK: case HEADER_SUCCESS: - WARN ((0, 0, _("Skipping to next file header"))); + WARN ((0, 0, _("Skipping to next header"))); break; case HEADER_END_OF_FILE: @@ -312,9 +328,10 @@ read_header (void) unsigned_sum += ' ' * sizeof header->header.chksum; signed_sum += ' ' * sizeof header->header.chksum; - parsed_sum = from_chars (header->header.chksum, - sizeof header->header.chksum, 0, - (uintmax_t) 0, (uintmax_t) TYPE_MAXIMUM (int)); + 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; @@ -328,7 +345,7 @@ read_header (void) if (header->header.typeflag == LNKTYPE) current_stat.st_size = 0; /* links 0 size on tape */ else - current_stat.st_size = OFF_FROM_CHARS (header->header.size); + current_stat.st_size = OFF_FROM_HEADER (header->header.size); if (header->header.typeflag == GNUTYPE_LONGNAME || header->header.typeflag == GNUTYPE_LONGLINK) @@ -447,19 +464,19 @@ decode_header (union block *header, struct stat *stat_info, format = V7_FORMAT; *format_pointer = format; - stat_info->st_mode = MODE_FROM_CHARS (header->header.mode); - stat_info->st_mtime = TIME_FROM_CHARS (header->header.mtime); + 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_CHARS (header->oldgnu_header.atime); - stat_info->st_ctime = TIME_FROM_CHARS (header->oldgnu_header.ctime); + 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_CHARS (header->header.uid); - stat_info->st_gid = GID_FROM_CHARS (header->header.gid); + 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 @@ -471,25 +488,25 @@ decode_header (union block *header, struct stat *stat_info, if (numeric_owner_option || !*header->header.uname || !uname_to_uid (header->header.uname, &stat_info->st_uid)) - stat_info->st_uid = UID_FROM_CHARS (header->header.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_CHARS (header->header.gid); + stat_info->st_gid = GID_FROM_HEADER (header->header.gid); } switch (header->header.typeflag) { case BLKTYPE: stat_info->st_rdev - = makedev (MAJOR_FROM_CHARS (header->header.devmajor), - MINOR_FROM_CHARS (header->header.devminor)); + = makedev (MAJOR_FROM_HEADER (header->header.devmajor), + MINOR_FROM_HEADER (header->header.devminor)); break; case CHRTYPE: stat_info->st_rdev - = makedev (MAJOR_FROM_CHARS (header->header.devmajor), - MINOR_FROM_CHARS (header->header.devminor)); + = makedev (MAJOR_FROM_HEADER (header->header.devmajor), + MINOR_FROM_HEADER (header->header.devminor)); break; default: @@ -501,12 +518,12 @@ decode_header (union block *header, struct stat *stat_info, /*------------------------------------------------------------------------. | 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. | +| range -MINUS_MINVAL through MAXVAL. DIGS must be positive. | `------------------------------------------------------------------------*/ static uintmax_t -from_chars (char const *where0, size_t digs, char const *type, - uintmax_t minus_minval, uintmax_t maxval) +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; @@ -536,45 +553,115 @@ from_chars (char const *where0, size_t digs, char const *type, value = 0; if (ISODIGIT (*where)) { - do + char const *where1 = where; + uintmax_t overflow = 0; + + for (;;) { - if (value << LG_8 >> LG_8 != value) + 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 ((overflow || maxval < value) && '4' <= *where1) + { + /* Compute the negative of the input value, assuming two's + complement. */ + for (value = 0, where = where1, overflow = 0; ; ) + { + value += 7 - (*where++ - '0'); + if (where == lim || ! ISODIGIT (*where)) + break; + overflow |= value ^ (value << LG_8 >> LG_8); + value <<= LG_8; + } + value++; + overflow |= !value; + + if (!overflow && value <= minus_minval) { - ERROR ((0, 0, - _("Archive octal string `%.*s' is out of %s range"), - (int) digs, where0, type)); - return -1; + WARN ((0, 0, + _("Archive octal value %.*s is out of %s range; assuming two's complement"), + (int) (where - where1), where1, type)); + negative = 1; } - value = (value << LG_8) | (*where++ - '0'); } - while (where != lim && ISODIGIT (*where)); - /* Parse the output of older tars, which output negative values - in two's complement octal. This method works only if the - type has the same number of bits as it did on the host that - created the tar file, but that's the best we can do. */ - if (maxval < value && value - maxval <= minus_minval) + if (overflow) { - value = minus_minval - (value - maxval); - negative = 1; + ERROR ((0, 0, + _("Archive octal value %.*s is out of %s range"), + (int) (where - where1), where1, type)); + return -1; } } - else if (*where == '-' || *where == '+') + else if (type) { - int dig; - negative = *where++ == '-'; - while (where != lim - && (dig = base64_map[(unsigned char) *where]) < 64) + /* The following forms cannot appear as checksums, so we don't + check for them if TYPE is null. */ + + 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) + { + ERROR ((0, 0, + _("Archive signed base-64 string `%.*s' is out of %s range"), + (int) digs, where0, type)); + return -1; + } + value = (value << LG_64) | dig; + where++; + } + } + else if (*where == '\200' /* positive base-256 */ + || *where == '\377' /* negative base-256 */) { - if (value << LG_64 >> LG_64 != value) + /* 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 (;;) { - ERROR ((0, 0, - _("Archive signed base 64 string `%.*s' is out of %s range"), - (int) digs, where0, type)); - return -1; + value = (value << LG_256) + (unsigned char) *where++; + if (where == lim) + break; + if (((value << LG_256 >> LG_256) | topbits) != value) + { + ERROR ((0, 0, + _("Archive base-256 value is out of %s range"), + type)); + return -1; + } } - value = (value << LG_64) | dig; - where++; + negative = signbit; + if (negative) + value = -value; } } @@ -625,36 +712,36 @@ from_chars (char const *where0, size_t digs, char const *type, } gid_t -gid_from_chars (const char *p, size_t s) +gid_from_header (const char *p, size_t s) { - return from_chars (p, s, "gid_t", - - (uintmax_t) TYPE_MINIMUM (gid_t), - (uintmax_t) TYPE_MAXIMUM (gid_t)); + return from_header (p, s, "gid_t", + - (uintmax_t) TYPE_MINIMUM (gid_t), + (uintmax_t) TYPE_MAXIMUM (gid_t)); } major_t -major_from_chars (const char *p, size_t s) +major_from_header (const char *p, size_t s) { - return from_chars (p, s, "major_t", - - (uintmax_t) TYPE_MINIMUM (major_t), - (uintmax_t) TYPE_MAXIMUM (major_t)); + return from_header (p, s, "major_t", + - (uintmax_t) TYPE_MINIMUM (major_t), + (uintmax_t) TYPE_MAXIMUM (major_t)); } minor_t -minor_from_chars (const char *p, size_t s) +minor_from_header (const char *p, size_t s) { - return from_chars (p, s, "minor_t", - - (uintmax_t) TYPE_MINIMUM (minor_t), - (uintmax_t) TYPE_MAXIMUM (minor_t)); + return from_header (p, s, "minor_t", + - (uintmax_t) TYPE_MINIMUM (minor_t), + (uintmax_t) TYPE_MAXIMUM (minor_t)); } mode_t -mode_from_chars (const char *p, size_t s) +mode_from_header (const char *p, size_t s) { /* Do not complain about unrecognized mode bits. */ - unsigned u = from_chars (p, s, "mode_t", - - (uintmax_t) TYPE_MINIMUM (mode_t), - TYPE_MAXIMUM (uintmax_t)); + 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) @@ -670,42 +757,45 @@ mode_from_chars (const char *p, size_t s) } off_t -off_from_chars (const char *p, size_t s) +off_from_header (const char *p, size_t s) { /* Negative offsets are not allowed in tar files, so invoke - from_chars with minimum value 0, not TYPE_MINIMUM (off_t). */ - return from_chars (p, s, "off_t", (uintmax_t) 0, - (uintmax_t) TYPE_MAXIMUM (off_t)); + 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_chars (const char *p, size_t s) +size_from_header (const char *p, size_t s) { - return from_chars (p, s, "size_t", (uintmax_t) 0, - (uintmax_t) TYPE_MAXIMUM (size_t)); + return from_header (p, s, "size_t", (uintmax_t) 0, + (uintmax_t) TYPE_MAXIMUM (size_t)); } time_t -time_from_chars (const char *p, size_t s) +time_from_header (const char *p, size_t s) { - return from_chars (p, s, "time_t", - - (uintmax_t) TYPE_MINIMUM (time_t), - (uintmax_t) TYPE_MAXIMUM (time_t)); + time_t t = from_header (p, s, "time_t", + - (uintmax_t) TYPE_MINIMUM (time_t), + (uintmax_t) TYPE_MAXIMUM (time_t)); + if (start_time < t && time (0) < t) + WARN ((0, 0, _("Archive contains future timestamp %s"), tartime (t))); + return t; } uid_t -uid_from_chars (const char *p, size_t s) +uid_from_header (const char *p, size_t s) { - return from_chars (p, s, "uid_t", - - (uintmax_t) TYPE_MINIMUM (uid_t), - (uintmax_t) TYPE_MAXIMUM (uid_t)); + return from_header (p, s, "uid_t", + - (uintmax_t) TYPE_MINIMUM (uid_t), + (uintmax_t) TYPE_MAXIMUM (uid_t)); } uintmax_t -uintmax_from_chars (const char *p, size_t s) +uintmax_from_header (const char *p, size_t s) { - return from_chars (p, s, "uintmax_t", (uintmax_t) 0, - TYPE_MAXIMUM (uintmax_t)); + return from_header (p, s, "uintmax_t", (uintmax_t) 0, + TYPE_MAXIMUM (uintmax_t)); } @@ -723,20 +813,30 @@ stringify_uintmax_t_backwards (uintmax_t o, char *buf) return buf; } -#if !USE_OLD_CTIME - -/*-------------------------------------------. -| Return the time formatted along ISO 8601. | -`-------------------------------------------*/ - -/* Also, see http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html. */ - +/* 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. */ static char const * -isotime (time_t time) +tartime (time_t t) { static char buffer[max (UINTMAX_STRSIZE_BOUND + 1, INT_STRLEN_BOUND (int) + 16)]; - struct tm *tm = localtime (&time); + char *p; + +#if USE_OLD_CTIME + p = ctime (&t); + if (p) + { + char const *time_stamp = p + 4; + for (p += 16; p[4] != '\n'; p++) + p[0] = p[4]; + 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", @@ -744,24 +844,20 @@ isotime (time_t time) tm->tm_hour, tm->tm_min, tm->tm_sec); return buffer; } - else - { - /* 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. */ - uintmax_t abstime = time < 0 ? - (uintmax_t) time : time; - char *p = stringify_uintmax_t_backwards (abstime, - buffer + sizeof buffer); - if (time < 0) - *--p = '-'; - while (buffer + sizeof buffer - 19 - 1 < p) - *--p = ' '; - return p; - } -} +#endif -#endif /* not USE_OLD_CTIME */ + /* 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; +} /*-------------------------------------------------------------------------. | Decode MODE from its binary form in a stat structure, and encode it into | @@ -826,7 +922,6 @@ print_header (void) char size[2 * UINTMAX_STRSIZE_BOUND]; /* holds formatted size or major,minor */ char uintbuf[UINTMAX_STRSIZE_BOUND]; - time_t longie; /* to make ctime() call portable */ int pad; char *name; @@ -910,23 +1005,7 @@ print_header (void) /* Time stamp. */ - longie = current_stat.st_mtime; -#if USE_OLD_CTIME - { - char *ct = ctime (&longie); - if (ct) - { - time_stamp = ct + 4; - for (ct += 16; ct[4] != '\n'; ct++) - ct[0] = ct[4]; - ct[0] = '\0'; - } - else - time_stamp = "??? ?? ??:?? ????"; - } -#else - time_stamp = isotime (longie); -#endif + time_stamp = tartime (current_stat.st_mtime); /* User and group names. */ @@ -934,7 +1013,7 @@ print_header (void) && !numeric_owner_option) user = current_header->header.uname; else - user = STRINGIFY_BIGINT (UINTMAX_FROM_CHARS + user = STRINGIFY_BIGINT (UINTMAX_FROM_HEADER (current_header->header.uid), uform); @@ -942,7 +1021,7 @@ print_header (void) && !numeric_owner_option) group = current_header->header.gname; else - group = STRINGIFY_BIGINT (UINTMAX_FROM_CHARS + group = STRINGIFY_BIGINT (UINTMAX_FROM_HEADER (current_header->header.gid), gform); @@ -961,7 +1040,8 @@ print_header (void) case GNUTYPE_SPARSE: strcpy (size, STRINGIFY_BIGINT - (UINTMAX_FROM_CHARS (current_header->oldgnu_header.realsize), + (UINTMAX_FROM_HEADER (current_header + ->oldgnu_header.realsize), uintbuf)); break; default: @@ -1035,7 +1115,7 @@ print_header (void) case GNUTYPE_MULTIVOL: strcpy (size, STRINGIFY_BIGINT - (UINTMAX_FROM_CHARS (current_header->oldgnu_header.offset), + (UINTMAX_FROM_HEADER (current_header->oldgnu_header.offset), uintbuf)); fprintf (stdlis, _("--Continued at byte %s--\n"), size); break; -- 2.44.0