Age | Commit message (Collapse) | Author |
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Quote file names using the "shell-escape" or "shell-escape-always"
methods, which quote as appropriate for most shells,
and better support copy and paste of presented names.
The "always" variant is used when the file name is
embedded in an error message with surrounding spaces.
* cfg.mk (sc_error_shell_quotes): A new syntax check rule
to suggest quotef() where appropriate.
(sc_error_shell_always_quotes): Likewise for quoteaf().
* src/system.h (quotef): A new define to apply shell quoting
when needed. I.E. when shell character or ':' is present.
(quoteaf): Likewise, but always quote.
* src/*.c: Use quotef() and quoteaf() rather than quote()
where appropriate.
* tests/: Adjust accordingly.
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These strings are often file names or other user specified
parameters, which can give confusing errors in
the presence of unexpected characters for example.
* cfg.mk (sc_error_quotes): A new syntax check rule.
* src/*.c: Wrap error() string arguments with quote().
* tests/: Adjust accordingly.
* NEWS: Mention the improvement.
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* src/system.h (emit_stdin_note): A new function, refactoring
the usage note about the '-' FILE implying stdin.
* src/base64.c (usage): Use the new function to emit the
note in a standard location and with standard separation.
* src/cat.c (usage): Likewise.
* src/csplit.c (usage): Likewise.
* src/cut.c (usage): Likewise.
* src/expand.c (usage): Likewise.
* src/fmt.c (usage): Likewise.
* src/head.c (usage): Likewise.
* src/md5sum.c (usage): Likewise.
* src/nl.c (usage): Likewise.
* src/od.c (usage): Likewise.
* src/paste.c (usage): Likewise.
* src/pr.c (usage): Likewise.
* src/ptx.c (usage): Likewise.
* src/shred.c (usage): Likewise.
* src/shuf.c (usage): Likewise.
* src/sort.c (usage): Likewise.
* src/sum.c (usage): Likewise.
* src/tac.c (usage): Likewise.
* src/tail.c (usage): Likewise.
* src/tsort.c (usage): Likewise.
* src/unexpand.c (usage): Likewise.
* src/wc.c (usage): Likewise.
* src/join.c (usage): Adjust the separation used for
the message referring to FILE1 or FILE2 as stdin.
* src/comm.c (usage): Add a message using the same
wording (translation) as used in join.
* src/split.c (usage): Reword to using FILE rather than
INPUT, allowing use of emit_stdin_note(). Also remove
the mention of "fixed-size" pieces as this isn't now
always the case.
Fixes http://pad.lv/1450179
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Run "make update-copyright" and then...
* tests/sample-test: Adjust to use the single most recent year.
* tests/du/bind-mount-dir-cycle-v2.sh: Fix case in copyright message,
so that year is updated automatically in future.
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* src/system.h (emit_ancillary_info): Take the invariant PROGRAM_NAME
as a parameter, so that consistent references are made to online docs
and texinfo nodes, when a --program-prefix is in place. Note the
man pages don't need this fix as they're generated before the program
prefix is used.
* NEWS: Mention the improvements in references to online documentation.
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* build-aux/gen-single-binary.sh: Don't use ATTRIBUTE_NORETURN
for main functions.
* src/base64.c, src/basename.c, src/cat.c, src/chcon.c, src/chgrp.c:
* src/chmod.c, src/chown.c, src/chroot.c, src/cksum.c, src/comm.c:
* src/cp.c, src/csplit.c, src/cut.c, src/date.c, src/dd.c, src/df.c:
* src/dircolors.c, src/dirname.c, src/du.c, src/echo.c, src/env.c:
* src/expand.c, src/expr.c, src/factor.c, src/fmt.c, src/fold.c:
* src/getlimits.c, src/groups.c, src/head.c, src/hostid.c:
* src/hostname.c, src/id.c, src/install.c, src/join.c, src/kill.c:
* src/link.c, src/ln.c, src/logname.c, src/ls.c, src/make-prime-list.c:
* src/md5sum.c, src/mkdir.c, src/mkfifo.c, src/mknod.c, src/mktemp.c:
* src/mv.c, src/nice.c, src/nl.c, src/nohup.c, src/nproc.c:
* src/numfmt.c, src/od.c, src/paste.c, src/pathchk.c, src/pinky.c:
* src/pr.c, src/printenv.c, src/printf.c, src/ptx.c, src/pwd.c:
* src/readlink.c, src/realpath.c, src/rm.c, src/rmdir.c, src/runcon.c:
* src/seq.c, src/shred.c, src/shuf.c, src/sleep.c, src/sort.c:
* src/split.c, src/stat.c, src/stdbuf.c, src/stty.c, src/sum.c:
* src/sync.c, src/tac.c, src/tail.c, src/tee.c, src/timeout.c:
* src/touch.c, src/tr.c, src/true.c, src/truncate.c, src/tsort.c:
* src/tty.c, src/uname.c, src/unexpand.c, src/uniq.c, src/unlink.c:
* src/uptime.c, src/users.c, src/wc.c, src/who.c, src/whoami.c:
In 'main' functions, Prefer 'return status;' to 'exit (status);'.
* src/coreutils-arch.c (_single_binary_main_uname)
(_single_binary_main_arch):
* src/coreutils-dir.c, src/coreutils-vdir.c (_single_binary_main_ls)
(_single_binary_main_dir, _single_binary_main_vdir):
Omit ATTRIBUTE_NORETURN. Return a value.
* src/coreutils.c (SINGLE_BINARY_PROGRAM): Omit ATTRIBUTE_NORETURN.
(launch_program): Now static.
* src/dd.c (finish_up): New function.
(quit, main): Use it.
* src/getlimits.c (main): Return a proper exit status.
* src/test.c (test_main_return): New macro.
(main): Use it.
* src/logname.c, src/nohup.c, src/whoami.c:
Use 'error' to simplify exit status in 'main' function.
* src/yes.c (main): Use 'return' rather than 'error' to exit,
so that GCC doesn't suggest ATTRIBUTE_NORETURN.
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Run "make update-copyright", but then also run this,
perl -pi -e 's/2\d\d\d-//' tests/sample-test
to make that one script use the single most recent year number.
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Each program with at least one long option which is marked as
'required_argument' and which has also a short option for that
option, should print a note about mandatory arguments.
Define that well-known note centrally and use it rather than
literal printf/fputs, and add it where it was missing.
* src/system.h (emit_mandatory_arg_note): Add new function.
* src/cp.c (usage): Use it rather than literal printf/fputs.
* src/csplit.c, src/cut.c, src/date.c, src/df.c, src/du.c:
* src/expand.c, src/fmt.c, src/fold.c, src/head.c, src/install.c:
* src/kill.c, src/ln.c, src/ls.c, src/mkdir.c, src/mkfifo.c:
* src/mknod.c, src/mv.c, src/nl.c, src/od.c, src/paste.c:
* src/pr.c, src/ptx.c, src/shred.c, src/shuf.c, src/sort.c:
* src/split.c, src/stdbuf.c, src/tac.c, src/tail.c, src/timeout.c:
* src/touch.c, src/truncate.c, src/unexpand.c, src/uniq.c:
Likewise.
* src/base64.c (usage): Add call of the above new function
because at least one long option has a required argument.
* src/basename.c, src/chcon.c, src/date.c, src/env.c:
* src/nice.c, src/runcon.c, src/seq.c, src/stat.c, src/stty.c:
Likewise.
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Run "make update-copyright", but then also run this,
perl -pi -e 's/2\d\d\d-//' tests/sample-test
to make that one script use the single most recent year number.
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Run "make update-copyright".
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Run this (twice):
git grep -E -l '`[^ ]+'\' src/*.c \
|xargs perl -pi -e 's/`([^ ]+'\'')/'\''$1/'
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Run this command:
perl -0777 -pi -e \
's/fprintf \(stderr, _\("Try `%s --help.*\n.*;/emit_try_help ();/m'\
src/*.c
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Run "make update-copyright".
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The following dropped the space from the first field
printf "1234567 \t1\n" | unexpand -a
Note POSIX says that spaces should not precede tabs.
Also a single trailing space should not be converted
if the next field starts with non blank characters.
So we enforce those rules too, with this change.
* src/unexpand.c (unexpand): Implement as per POSIX rules.
* tests/misc/unexpand: Add tests, and adjust existing
tests as per POSIX rules.
* NEWS: Mention the fix.
Reported by Hallvard B Furuseth
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Run "make update-copyright".
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Following on from commit dae35bac, 01-03-2010,
"sort: inform the system about our input access pattern"
apply the same hint to all appropriate utils.
This currently gives around a 5% speedup for reading
large files from fast flash devices on GNU/Linux.
* src/base64.c: Call fadvise (..., FADVISE_SEQUENTIAL);
* src/cat.c: Likewise.
* src/cksum.c: Likewise.
* src/comm.c: Likewise.
* src/cut.c: Likewise.
* src/expand.c: Likewise.
* src/fmt.c: Likewise.
* src/fold.c: Likewise.
* src/join.c: Likewise.
* src/md5sum.c: Likewise.
* src/nl.c: Likewise.
* src/paste.c: Likewise.
* src/pr.c: Likewise.
* src/ptx.c: Likewise.
* src/shuf.c: Likewise.
* src/sum.c: Likewise.
* src/tee.c: Likewise.
* src/tr.c: Likewise.
* src/tsort.c: Likewise.
* src/unexpand.c: Likewise.
* src/uniq.c: Likewise.
* src/wc.c: Likewise, unless we don't actually read().
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E.g.,
- size_t desired_width IF_LINT (= 0);
+ size_t desired_width IF_LINT ( = 0);
Use this command:
g grep -l IF_LINT | grep '\.[ch]$' \
| xargs perl -pi -e 's/(IF_LINT \()= /$1 = /'
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Run this command:
git ls-files | grep '\.[ch]$' \
| xargs perl -pi -e 's/for \(;;\)/while (true)/g'
...except for randint.c, which does not include stdbool.h.
In that case, use "while (1)".
* gl/lib/randint.c (randint_genmax): Use "while (1)" for infloops.
* src/cat.c (simple_cat, cat): Use "while (true)" for infloops.
* gl/lib/randread.c (readsource, readisaac): Likewise.
* src/copy.c (copy_reg): Likewise.
* src/csplit.c (record_line_starts, process_regexp): Likewise.
* src/cut.c (set_fields): Likewise.
* src/dd.c (iread, parse_symbols): Likewise.
* src/df.c (find_mount_point, main): Likewise.
* src/du.c (main): Likewise.
* src/expand.c (expand): Likewise.
* src/factor.c (factor_using_division, do_stdin): Likewise.
* src/fmt.c (get_space): Likewise.
* src/ls.c (decode_switches): Likewise.
* src/od.c (main): Likewise.
* src/pr.c (main, read_line): Likewise.
* src/shred.c (dopass, genpattern): Likewise.
* src/sort.c (initbuf, fillbuf, getmonth, keycompare): Likewise.
* src/split.c (bytes_split, lines_split): Likewise.
* src/tac.c (tac_seekable): Likewise.
* src/test.c (and, or): Likewise.
* src/tr.c (squeeze_filter, main): Likewise.
* src/tsort.c (search_item): Likewise.
* src/unexpand.c (unexpand): Likewise.
* src/uniq.c (main): Likewise.
* src/yes.c (main): Likewise.
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Use this command:
git ls-files | grep -v COPYING \
| xargs env UPDATE_COPYRIGHT_USE_INTERVALS=1 \
build-aux/update-copyright
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This is because bitwise operators are:
- confusing and inconsistent in a boolean context
- non short circuiting
- brittle in C89 where bool can be an int (so > 1)
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* src/system.h: Rename emit_bug_reporting_address() to
emit_ancillary_info() and update it to not print the translation
project address in en_* locales, and _do_ print it in the 'C'
(and other) locales so that it's included in the default man page.
Also mention how to invoke the texinfo documentation for each command.
Also move the "hard-locale.h" include to the 8 files that now use it.
* man/help2man: Strip the newly added texinfo reference from the
--help output as a more verbose version is already added by help2man.
Suggestion from C de-Avillez
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Transformed via this shell code:
t=$'\t'
git ls-files \
| grep -vE '(^|/)((GNU)?[Mm]akefile|ChangeLog)|\.(am|mk)$' \
| grep -vE 'tests/pr/|help2man' \
| xargs grep -lE "^ *$t" \
| xargs perl -MText::Tabs -ni -le \
'$m=/^( *\t[ \t]*)(.*)/; print $m ? expand($1) . $2 : $_'
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* src/ls.c (ASSERT_MATCHING_DEV_INO): Comment-out unused definition,
to match commented-out use.
* src/install.c (INITIAL_HASH_MODULE, INITIAL_ENTRY_TAB_SIZE):
(READ_SIZE): Remove definitions of unused macros.
* src/mv.c (INITIAL_HASH_MODULE, INITIAL_ENTRY_TAB_SIZE): Likewise.
* src/dd.c (max): Likewise.
* src/expand.c (OUTPUT_BLOCK): Likewise.
* src/csplit.c (ALLOC_SIZE): Likewise.
* src/pr.c (NULLCOL): Likewise.
* src/ptx.c (Sword): Likewise.
* src/unexpand.c (OUTPUT_BLOCK): Likewise.
* src/factor.c (NDEBUG): Likewise.
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Use the new "bad_cast" function or an actual cast-to-"(char *)"
to avoid warnings.
* src/system.h (bad_cast): Define.
* src/chown.c (main):
* src/chroot.c (main):
* src/date.c (main):
* src/du.c (main):
* src/expand.c (stdin_argv):
* src/ls.c (decode_switches):
* src/md5sum.c (main):
* src/paste.c (main):
* src/pr.c (col_sep_string, column_separator, line_separator, main):
* src/sort.c (main):
* src/split.c (main):
* src/tail.c (main):
* src/unexpand.c (stdin_argv):
* src/yes.c (main):
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In 1463824d8e7f72c31f1d803d7cfe2b608ccafc5c, I added some
missing "const" directives, as well as some new, redundant ones.
This removes the redundant ones. Pointed out by Eric Blake.
* base64.c, cat.c, chcon.c, chgrp.c, chmod.c, chown.c, comm.c:
* cp.c, csplit.c, cut.c, date.c, dd.c, df.c, dircolors.c, du.c:
* env.c, expand.c, fmt.c, fold.c, groups.c, head.c, id.c:
* install.c, join.c, kill.c, ln.c, ls.c, md5sum.c, mkdir.c:
* mkfifo.c, mknod.c, mktemp.c, mv.c, nice.c, nl.c, od.c:
* paste.c, pathchk.c, pinky.c, pr.c, ptx.c, readlink.c, rm.c:
* rmdir.c, runcon.c, seq.c, shred.c, shuf.c, sort.c, split.c:
* stat.c, stty.c, su.c, sum.c, tac.c, tail.c, tee.c, timeout.c:
* touch.c, tr.c, truncate.c, tty.c, uname.c, unexpand.c, uniq.c:
* wc.c, who.c: Remove redundant const directives.
* maint.mk (sc_const_long_option): Don't require redundant "const".
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* maint.mk (sc_const_long_option): New rule. Enforce global change.
* src/base64.c (long_options): Use "const" where possible.
* src/cat.c (main): Likewise.
* src/chcon.c (long_options): Likewise.
* src/chgrp.c (long_options): Likewise.
* src/chmod.c (long_options): Likewise.
* src/chown.c (long_options): Likewise.
* src/comm.c (long_options, OUTPUT_DELIMITER_OPTION): Likewise.
* src/cp.c (long_opts): Likewise.
* src/csplit.c (longopts): Likewise.
* src/cut.c (longopts): Likewise.
* src/date.c (long_options): Likewise.
* src/dd.c (conversions, flags, statuses): Likewise.
* src/df.c (long_options): Likewise.
* src/dircolors.c (long_options): Likewise.
* src/du.c (long_options): Likewise.
* src/env.c (longopts): Likewise.
* src/expand.c (longopts): Likewise.
* src/fmt.c (long_options): Likewise.
* src/fold.c (longopts): Likewise.
* src/groups.c (longopts): Likewise.
* src/head.c (long_options): Likewise.
* src/id.c (longopts): Likewise.
* src/install.c (long_options): Likewise.
* src/join.c (longopts): Likewise.
* src/kill.c (long_options): Likewise.
* src/ln.c (long_options): Likewise.
* src/ls.c (long_time_format, long_options, sort_functions): Likewise.
* src/md5sum.c (long_options): Likewise.
* src/mkdir.c (longopts): Likewise.
* src/mkfifo.c (longopts): Likewise.
* src/mknod.c (longopts): Likewise.
* src/mktemp.c (longopts): Likewise.
* src/mv.c (long_options): Likewise.
* src/nice.c (longopts): Likewise.
* src/nl.c (longopts): Likewise.
* src/od.c (charname, long_options): Likewise.
* src/paste.c (longopts): Likewise.
* src/pathchk.c (longopts): Likewise.
* src/pinky.c (longopts): Likewise.
* src/pr.c (long_options): Likewise.
* src/ptx.c (long_options): Likewise.
* src/readlink.c (longopts): Likewise.
* src/rm.c (long_opts): Likewise.
* src/rmdir.c (longopts): Likewise.
* src/runcon.c (long_options): Likewise.
* src/seq.c (long_options): Likewise.
* src/shred.c (long_opts): Likewise.
* src/shuf.c (long_opts): Likewise.
* src/sort.c (monthtab, long_options): Likewise.
* src/split.c (longopts): Likewise.
* src/stat.c (long_options): Likewise.
* src/stty.c (mode_info, control_info, longopts, set_mode) Likewise.
(set_control_char, speeds): Likewise.
* src/su.c (longopts): Likewise.
* src/sum.c (longopts): Likewise.
* src/tac.c (longopts): Likewise.
* src/tail.c (long_options): Likewise.
* src/tee.c (long_options): Likewise.
* src/timeout.c (long_options): Likewise.
* src/touch.c (longopts): Likewise.
* src/tr.c (long_options): Likewise.
* src/truncate.c (longopts): Likewise.
* src/tty.c (longopts): Likewise.
* src/uname.c (uname_long_options, arch_long_options): Likewise.
* src/unexpand.c (longopts): Likewise.
* src/uniq.c (longopts): Likewise.
* src/wc.c (longopts): Likewise.
* src/who.c (longopts): Likewise.
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* bootstrap.conf (gnulib_modules): Add progname.
* src/*.c (program_name): Remove declaration.
* (main): Call set_program_name rather than setting program_name.
* src/nice.c (main): Cast program_name to "(char *)".
* src/prog-fprintf.c: Include "system.h"
* src/system.h: Include "progname.h".
* maint.mk (sc_program_name): Adjust rule.
Suggestion from Eric Blake.
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* src/base64.c: Likewise.
* src/basename.c: Likewise.
* src/cat.c: Likewise.
* src/chcon.c: Likewise.
* src/chgrp.c: Likewise.
* src/chmod.c: Likewise.
* src/chown.c: Likewise.
* src/chroot.c: Likewise.
* src/cksum.c: Likewise.
* src/comm.c: Likewise.
* src/cp.c: Likewise.
* src/csplit.c: Likewise.
* src/cut.c: Likewise.
* src/date.c: Likewise.
* src/dd.c: Likewise.
* src/df.c: Likewise.
* src/dircolors.c: Likewise.
* src/dirname.c: Likewise.
* src/du.c: Likewise.
* src/echo.c: Likewise.
* src/env.c: Likewise.
* src/expand.c: Likewise.
* src/expr.c: Likewise.
* src/factor.c: Likewise.
* src/fmt.c: Likewise.
* src/fold.c: Likewise.
* src/groups.c: Likewise.
* src/head.c: Likewise.
* src/hostid.c: Likewise.
* src/hostname.c: Likewise.
* src/id.c: Likewise.
* src/install.c: Likewise.
* src/join.c: Likewise.
* src/kill.c: Likewise.
* src/link.c: Likewise.
* src/ln.c: Likewise.
* src/logname.c: Likewise.
* src/ls.c: Likewise.
* src/md5sum.c: Likewise.
* src/mkdir.c: Likewise.
* src/mkfifo.c: Likewise.
* src/mknod.c: Likewise.
* src/mktemp.c: Likewise.
* src/mv.c: Likewise.
* src/nice.c: Likewise.
* src/nl.c: Likewise.
* src/nohup.c: Likewise.
* src/od.c: Likewise.
* src/paste.c: Likewise.
* src/pathchk.c: Likewise.
* src/pinky.c: Likewise.
* src/pr.c: Likewise.
* src/printenv.c: Likewise.
* src/printf.c: Likewise.
* src/ptx.c: Likewise.
* src/pwd.c: Likewise.
* src/readlink.c: Likewise.
* src/rm.c: Likewise.
* src/rmdir.c: Likewise.
* src/runcon.c: Likewise.
* src/seq.c: Likewise.
* src/setuidgid.c: Likewise.
* src/shuf.c: Likewise.
* src/sleep.c: Likewise.
* src/sort.c: Likewise.
* src/split.c: Likewise.
* src/stat.c: Likewise.
* src/stty.c: Likewise.
* src/su.c: Likewise.
* src/sum.c: Likewise.
* src/sync.c: Likewise.
* src/tac.c: Likewise.
* src/tail.c: Likewise.
* src/tee.c: Likewise.
* src/test.c: Likewise.
* src/timeout.c: Likewise.
* src/touch.c: Likewise.
* src/tr.c: Likewise.
* src/true.c: Likewise.
* src/tsort.c: Likewise.
* src/tty.c: Likewise.
* src/uname.c: Likewise.
* src/unexpand.c: Likewise.
* src/uniq.c: Likewise.
* src/unlink.c: Likewise.
* src/uptime.c: Likewise.
* src/users.c: Likewise.
* src/wc.c: Likewise.
* src/who.c: Likewise.
* src/whoami.c: Likewise.
* src/yes.c: Likewise.
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g grep -E -l 'define AUTHORS "[^,]+"$'|xargs perl -pi -e \
's/(define AUTHORS) ("[^,]+")$/$1 proper_name ($2)/'
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* src/system.h (emit_bug_reporting_address): New function.
* src/base64.c: Use it rather than a literal printf.
* src/basename.c, src/cat.c, src/chgrp.c, src/chmod.c:
* src/chown.c, src/chroot.c, src/cksum.c, src/comm.c, src/cp.c:
* src/csplit.c, src/cut.c, src/date.c, src/dd.c, src/df.c:
* src/dircolors.c, src/dirname.c, src/du.c, src/echo.c, src/env.c:
* src/expand.c, src/expr.c, src/factor.c, src/fmt.c, src/fold.c:
* src/head.c, src/hostid.c, src/hostname.c, src/id.c, src/install.c:
* src/join.c, src/kill.c, src/link.c, src/ln.c, src/logname.c:
* src/ls.c, src/md5sum.c, src/mkdir.c, src/mkfifo.c, src/mknod.c:
* src/mv.c, src/nice.c, src/nl.c, src/nohup.c, src/od.c:
* src/paste.c, src/pathchk.c, src/pinky.c, src/pr.c, src/printenv.c:
* src/printf.c, src/ptx.c, src/pwd.c, src/readlink.c, src/rm.c:
* src/rmdir.c, src/seq.c, src/setuidgid.c, src/shred.c, src/shuf.c:
* src/sleep.c, src/sort.c, src/split.c, src/stat.c, src/stty.c:
* src/su.c, src/sum.c, src/sync.c, src/system.h, src/tac.c:
* src/tail.c, src/tee.c, src/test.c, src/touch.c, src/tr.c:
* src/true.c, src/tsort.c, src/tty.c, src/uname.c, src/unexpand.c:
* src/uniq.c, src/unlink.c, src/uptime.c, src/users.c, src/wc.c:
* src/who.c, src/whoami.c, src/yes.c: Likewise.
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booleans (needed for pre-C99 hosts).
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--first-only option string from its description, so help2man formats
the derived man page properly.
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identical to the one in unexpand.c.
* src/unexpand.c (parse_tab_stops): Adjust syntax to make this function
identical to the one in expand.c.
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three).
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the input and output must be text.
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a type, not a value.
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(main): Don't complain about -TAB.
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place of nearly-equivalent code.
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specified via the obsolete form. E.g., now this command fails:
_POSIX2_VERSION=1 ./unexpand -$(echo '2^64+1'|bc)
Before it would act like `_POSIX2_VERSION=1 ./unexpand -1'.
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(parse_tab_stop): Renamed from parse_tabstop. All uses changed.
(validate_tab_stop): Renamed from validate_tabstop. All uses changed.
(next_file, main): Check fclose against 0, not EOF.
(unexpand): Remove unnecessary casts.
Add another loop nesting level, for lines, so that per-line variables
are initialized cleanly.
Revamp tab checking. Check for write error immediately, rather
than just once at the end of the program.
(TAB_STOP_SENTINEL): Remove.
(tab_size): Now size_t, not uintmax_t, since we need to store
the sequences of blanks.
(max_column_width): New var.
(usage): Say "blank" where POSIX requires this.
(add_tab_stop): Calculate maximum column width.
(unexpand): Store the pending blanks, instead of merely counting them.
Follow POSIX's rules about -a requiring two blanks before a tab stop.
Get rid of internal label and goto.
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