Commit Graph
100 Commits
Author SHA1 Message Date
Ron Yorston 5c69ad0ecd build system: drop PLATFORM_LINUX
PLATFORM_LINUX is a hidden configuration option which is disabled by
default and enabled at over a hundred locations for features that are
deemed to be Linux specific.

The only effect of PLATFORM_LINUX is to control compilation of
libbb/match_fstype.c.  This file is only needed by mount and umount.

Remove all references to PLATFORM_LINUX and compile match_fstype.c
if mount or umount is enabled.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-08-13 17:12:56 +02:00
Ron Yorston 17764603f2 httpd: allow '-h' to work when daemonized with NOMMU enabled
Commit d1b75e184 (httpd: permit non-default home directory with NOMMU
enabled) only works when used with the '-f' (foreground) option.

When '-f' isn't specified and NOMMU is enabled bb_daemonize_or_rexec()
is called to daemonize the server.  Since the server process has been
re-execed the previous patch results in the xchdir() not being called.

Fix this by resetting the re_execed variable in this case.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-06-09 17:38:21 +02:00
Ron Yorston 9f3b410006 ash,hush: drop pointer check before calls to show_history
show_history() checks that its argument in non-null so there's
no need to repeat the test at call sites.

function                                             old     new   delta
historycmd                                            25      17      -8
builtin_history                                       29      21      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-16)             Total: -16 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-30 17:30:02 +02:00
Ron Yorston 981b2eff81 mim: run scripts from a specification file
mim runs scripts from a specification file which can be thought
of as an extremely limited Makefile. Neither make variables nor
dependencies are supported. By default the file 'Mimfile' is read.
An example:

   hello:
      echo hello $1

   clean:
      rm -rf *

The command 'mim' or 'mim hello' will echo 'hello'. Unlike 'make'
arguments after the first are available to the script; they don't
specify additional targets.

mim isn't enabled by default.  Enabling it increases the size of the
binary by about 500 bytes.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-30 17:23:08 +02:00
Ron Yorston da7a6dbfa5 ash: fix build failure when command built-in is disabled
Since commit 7eb8eecbb (ash: eval: Add assignment built-in support
again) building BusyBox with the 'command' built-in disabled fails.

parse_command_args() only needs to be called when the 'command'
built-in is run.  Which it won't be if it's disabled.

v2: Avoiding infinite loops is good, too.  Thanks, Harald van Dijk.

Reported-by: Deweloper <deweloper@wp.pl>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-30 16:42:58 +02:00
Ron Yorston d1b75e1842 httpd: permit non-default home directory with NOMMU enabled
When BusyBox is compiled with NOMMU enabled running httpd with
the '-h' option fails even if the specified directory exists:

   $ ls -d www
   www
   $ busybox httpd  -fvvvp 8080 -h www
   ...
   ... try to access http://localhost:8080/www
   ...
   httpd: can't change directory to 'www': No such file or directory

The parent process executes xchdir("www").  When a connection is accepted
it's handled by re-executing httpd in inetd mode.  The child process
inherits the current directory "www" and tries to change directory again
to "www", which fails.

Omit the call to xchdir() when httpd is re-executed.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-30 16:37:44 +02:00
Ron Yorston 1c462d47a0 xargs: restore correct behaviour of -n option
Since commit 1ff7002b1 (xargs: fix handling of quoted arguments, closes
11441) the -n option hasn't worked properly:

   $ echo 1 2 3 | xargs -n 1 echo
   1
   2

   3

   $

Because state is now remembered between calls to process_stdin() it's
necessary to update the state before any premature return.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-29 15:53:51 +02:00
Ron Yorston 6cda0b04a3 ash: move TRACE statement in evalcommand()
Following recent work on evalcommand() a TRACE statement to report
the status of a forked command was left in the wrong place.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-24 12:52:41 +01:00
Ron Yorston d5bfe26c45 ash: return exit status of nofork applets (again)
Since commit d81af7216 (ash: eval: Reap zombies after built-in commands
and functions) if the shell is compiled with SH_STANDALONE and SH_NOFORK
enabled nofork applets potentially return the incorrect status.

The status value returned by evalcommand() in this case is obtained from
exitstatus in a call to waitforjob(NULL).  This overwrites the status
set for nonfork applets.

If this commit seems familiar it's essentially a reversion of commit
5ccb0e92fa (ash: return exit status of nofork applets).  What was correct
in 2016 is wrong in 2020 and vice versa.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20 10:39:46 +01:00
Ron Yorston 9e2a5668fd ash,hush: allow builtins to be tab-completed, closes 7532
function                                             old     new   delta
complete_cmd_dir_file                                678     830    +152
get_builtin_name                                       -      35     +35
optschanged                                          125     132      +7
hush_main                                           1069    1076      +7
save_command_ps_at_cur_history                        76      78      +2
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/0 up/down: 203/0)             Total: 203 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-01-29 15:23:17 +01:00
Ron Yorston 1ff7002b1d xargs: fix handling of quoted arguments, closes 11441
As reported in bug 11441 when presented with a large number of quoted
arguments xargs can return 'argument line too long':

   seq 10000 29999 | sed -e 's/^/"/' -e 's/$/"/' | busybox xargs echo

This happens because the variant of process_stdin() which handles quoted
arguments doesn't preserve state between calls.  If the allowed number
of characters is exceeded part way through a quoted argument the next
call to process_stdin() incorrectly treats the terminating quote as a
starting quote, thus quoting all of the argument separators.

function                                             old     new   delta
process_stdin                                        274     303     +29
xargs_main                                           731     745     +14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 43/0)               Total: 43 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-01-29 14:39:13 +01:00
Ron Yorston 16bcd504a3 vi: fixes to string search in colon commands, closes 10321
Handling of string searches in colon commands (e.g ':/pat1/,/pat2/cmd')
differ from standard vi:

- As reported in bug 10321 such searches can't be repeated using the
  'n' command.  This is because the last search pattern isn't updated.

- The search also can't be repeated using the command '://' because
  an empty search pattern doesn't imply the use of the last search
  pattern.

- Such searches should start on the line after the current line,
  otherwise '://' never moves to the next occurrence of the pattern.
  This can also affect other cases where line ranges are specified
  using search patterns.

Fix these various issues.

function                                             old     new   delta
get_one_address                                      325     342     +17

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-01-29 14:01:50 +01:00
Ron Yorston b0c711e64f ash: improve expandstr()
The dash maintainer recently posted a fix for issues with expanding
PS1.  These had already been fixed differently in BusyBox ash.  Borrow
a couple of improvements:

- Use a single call to setjmp() to trap errors in both readtoken1()
  and expandarg().

- In case of error set the prompt to the literal value of PS1 rather
  than the half-digested nonsense in stackblock() which might include
  ugly control characters.

function                                             old     new   delta
expandstr                                            353     300     -53

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-01-29 13:59:45 +01:00
Ron Yorston 943e81f5db ash: only catch unexpected exceptions in PS1 expansion
Commit d1a2fa2a4 (ash: catch error in arithmetic expansion in PS1)
catches all exceptions raised by expandarg().  Some exceptions, such as
the EXEXIT raised when command expansion is used, are expected:

   export PS1='$(echo "$ ")'

These should be processed normally or the shell hangs at the prompt.

function                                             old     new   delta
expandstr                                            344     353      +9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 9/0)                 Total: 9 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-31 13:44:32 +02:00
Ron Yorston 7b93e317c1 vi: enable 'dG' command. Closes 11801
The 'G' command was omitted from the list of commands that change or
delete whole lines.  Add it in the appropriate places so the 'dG',
'cG' and 'yG' commands work, including in cases where an explicit
line number has been supplied.

function                                             old     new   delta
find_range                                           534     596     +62
.rodata                                           175166  175167      +1
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 63/0)               Total: 63 bytes

Reported-by: David Kelly <david.kelly@liberica.ch>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-28 17:16:46 +02:00
Ron Yorston 4b49422a08 vi: fix changes to word at end of line. Closes 11796
As reported in bug 11796 BusyBox vi incorrectly handles changes
to a word at the end of a line.  If the following line starts
with whitespace changing or deleting the last word of a line
with the 'cw' or 'dw' commands causes the lines to be joined.

This happens because the range for the change returned by
find_range() covers all whitespace after the word, including
newlines.  The problem can be fixed by setting 'ml' to zero
to indicate to yank_delete() that processing should stop at
the end of the current line.

However, this results in a new problem.  'dw' correctly deletes
all whitespace following the word but so does 'cw', which should
preserve the trailing whitespace.  To fix this the code to omit
whitespace from the change is modified to include all whitespace
not just blanks.

function                                             old     new   delta
do_cmd                                              5034    5069     +35
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 35/0)               Total: 35 bytes

Reported-by: David Kelly <david.kelly@liberica.ch>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-28 17:16:46 +02:00
Ron Yorston d1a2fa2a4e ash: catch error in arithmetic expansion in PS1
Setting PS1 to:

   PS1='$((123+))'

causes the shell to enter an infinite error loop:

   sh: arithmetic syntax error

Catch any exception raised by expandarg() in expandstr() and allow
processing to continue.

function                                             old     new   delta
expandstr                                            262     344     +82
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 82/0)               Total: 82 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-19 13:21:34 +02:00
Ron Yorston 48645b8350 ash: prevent error in backquotes in PS1 from exiting shell
Setting PS1 to:

   PS1='`xxx(`'

causes the shell to terminate with the error:

   sh: syntax error: unexpected end of file (expecting ")")

This happens because old-style backquotes require the input to be reread
and thus call setinputstring() a second time.  Prevent the problem by
unwinding all recently opened files in expandstr().

function                                             old     new   delta
unwindfiles                                            -      22     +22
expandstr                                            247     262     +15
forkchild                                            631     625      -6
evalcommand                                         1694    1685      -9
ash_main                                            1346    1336     -10
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/3 up/down: 37/-25)             Total: 12 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-19 13:21:34 +02:00
Ron Yorston 1d37186fe2 ash: add bash-compatible EPOCH variables
Bash 5.0 added the dynamic variable EPOCHSECONDS and EPOCHREALTIME
which return the number of seconds since the Unix Epoch as an
integer or float.  These are useful for logging or tracing.

function                                             old     new   delta
change_epoch                                           -      78     +78
.rodata                                           175167  175235     +68
varinit_data                                         264     312     +48
change_seconds                                         -      24     +24
change_realtime                                        -      24     +24
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 2/0 up/down: 242/0)             Total: 242 bytes
   text	   data	    bss	    dec	    hex	filename
 938508	   4203	   1888	 944599	  e69d7	busybox_old
 938702	   4203	   1888	 944793	  e6a99	busybox_unstripped

v2: Cast tv_sec and tv_usec to unsigned quantities.
    Add brackets to macros.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-16 18:29:52 +02:00
Ron Yorston d96c69d876 ash: an unset dynamic variable should not be dynamic
Commit b28d4c346 (ash: [VAR] Move unsetvar functionality into setvareq)
dropped the code that caused dynamic variables to lose their special
properties when unset.  Add it back again.

function                                             old     new   delta
setvareq                                             346     360     +14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 14/0)               Total: 14 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-16 18:29:52 +02:00
Ron Yorston a81700bc08 hush: add bash-compatible EPOCH variables
Bash 5.0 added the dynamic variable EPOCHSECONDS and EPOCHREALTIME
which return the number of seconds since the Unix Epoch as an
integer or float.  These are useful for logging or tracing.

function                                             old     new   delta
get_local_var_value                                  207     302     +95
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 95/0)               Total: 95 bytes
   text	   data	    bss	    dec	    hex	filename
 938702	   4203	   1888	 944793	  e6a99	busybox_old
 938797	   4203	   1888	 944888	  e6af8	busybox_unstripped

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-16 18:29:52 +02:00
Ron Yorston e2026381be stat: reduce storage for human-readable filesystem names
function                                             old     new   delta
static.humanname                                       -     236    +236
static.fstype                                          -     140    +140
print_statfs                                         339     341      +2
static.humantypes                                    288       -    -288
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 1/0 up/down: 378/-288)           Total: 90 bytes
   text	   data	    bss	    dec	    hex	filename
 982183	    485	   7296	 989964	  f1b0c	busybox_old
 982152	    485	   7296	 989933	  f1aed	busybox_unstripped

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-12 12:00:38 +02:00
Ron Yorston 3e61b59ef3 vi: avoid build failure in non-default case
If vi is built with FEATURE_VI_USE_SIGNALS disabled and
FEATURE_VI_WIN_RESIZE enabled new_screen() is used without a
declaration.  Move the function to avoid this.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-03 16:20:13 +02:00
Ron Yorston e48559eae3 ash: distinguish 'wait -n' from other bashisms
Add a specific define to indicate which bash compatibility code
implements 'wait -n'.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-02 13:43:40 +02:00
Ron Yorston a2fd1aaf86 vi: allow manual screen update if SIGWINCH isn't supported
On platforms that don't support SIGWINCH vi can be configured
with FEATURE_VI_USE_SIGNALS disabled and FEATURE_VI_WIN_RESIZE
enabled.  This allows the user to force an update with ^L when
the screen is resized.

However, because the SIGWINCH handler hasn't run the virtual
screen buffer won't have been updated and the display becomes
corrupted.  Fix this by calling new_screen() if necessary.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-03-30 18:03:37 +01:00
Ron Yorston 3193cb56d6 libbb: mark scripted_main() as externally visible
Building with individual binaries enabled fails when embedded
script applets are included:

   /tmp/ccIvMFZg.o: In function `main':
   applet.c:(.text.main+0x20): undefined reference to `scripted_main'

Mark scripted_main() as externally visible.

Reported-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-03-30 16:46:27 +01:00
Ron Yorston 3c6f3336e1 man: don't skip default path which appears in config file
If the MANPATH environment variable isn't set a provisional default
path of /usr/man is placed in man_path_list.  This is only used if a
configuration file doesn't contain an alternative path.

If a configuration file lists the default path first:

   MANPATH /usr/man:/usr/share/man

add_MANPATH() sees that the default entry is already present and skips
it.  As a result man_path_list only contains the second and subsequent
components of the configured MANPATH.

In such cases the path should not be skipped.

function                                             old     new   delta
add_MANPATH                                          170     183     +13
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 13/0)               Total: 13 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-03-26 17:46:21 +01:00
Ron Yorston f55161ad27 ash: eval: avoid leaking memory associated with redirections. Closes 7748
The following constructs result in ever-increasing memory usage:

   while true; do { true; } </dev/null; done
   while true; do ( true; ) </dev/null; done

For comparison, bash displays static memory usage in both cases.

This has been fixed in dash by commit 2bc6caa.  The maintainer
writes:

   I have simplified evaltree so that it simply sets the stack mark
   unconditionally.  This allows us to remove the stack marks in the
   functions called by evaltree.

Closes BusyBox bug 7748.

function                                             old     new   delta
evaltree                                             606     632     +26
evalcommand                                         1724    1696     -28
evalcase                                             382     351     -31
evalfor                                              230     196     -34
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/3 up/down: 26/-93)            Total: -67 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-02-25 18:57:59 +01:00
Ron Yorston e563f9e851 du: don't count duplicate arguments. Closes 5288
Since coreutils 8.6 (2010-10-15) du no longer counts duplicate arguments.

Revert the relevant part of commit 618a3027ed (du: fix "du /dir /dir"
case).

function                                             old     new   delta
du_main                                              302     297      -5
reset_ino_dev_hashtable                               78       -     -78
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-83)             Total: -83 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-02-19 17:08:39 +01:00
Ron Yorston 61052d1bb8 vi: further fixes to undo after autoindent
Commit bb983f30e (vi: fix faulty undo after autoinsert) has a
number of problems:

- The commit message refers to 'autoinsert' when it really means
  'autoindent'.

- The indentation of undo_push_insert() was incorrect.

- Most seriously the commit only fixed the problem for cases where
  the indentation was exactly one character.  This is because undo_push()
  only allows single characters to be queued for UNDO_INS_QUEUED.

  Lifting this restriction allows the example given in the previous
  commit message (with a three character indent) to work.

function                                             old     new   delta
undo_push                                            406     435     +29
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 29/0)               Total: 29 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-02-11 11:47:20 +01:00
Ron Yorston df4e3af9f7 vi: fix replacement of single character with CR
Currently if the 'r' command is followed by a carriage return a
literal CR replaces the current character.

Fix this so that:

- a new line is inserted
- the autoindent setting is respected
- the cursor is placed at the start of the new line

function                                             old     new   delta
do_cmd                                              5052    5060      +8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 8/0)                 Total: 8 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-02-08 13:03:06 +01:00
Ron Yorston bb983f30e7 vi: fix faulty undo after autoinsert
Enable autoinsert and enter the following with an indent of three
spaces:

   line 1
   line 2

Using 'u' to undo the last insert results in:

   line1e 2

The insertion of the indent hasn't been properly recorded.

Since recording insertions is a common operation add a convenience
function, undo_push_insert(), to handle this and use it to record
the autoindent correctly.

function                                             old     new   delta
undo_push_insert                                       -      36     +36
string_insert                                        133     129      -4
char_insert                                          518     473     -45
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/2 up/down: 36/-49)            Total: -13 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-02-08 12:57:58 +01:00
Ron Yorston d08206dce1 vi: correctly detect when a deletion empties the buffer
Michał Berger has reported two issues:

- Repeatedly deleting and undoing the deletion of the last line
  results in characters being lost from the end of the line.

- Deleting the bottom line twice then attempting to undo each of
  these deletions results in a segfault.

The problem seems to be an incorrect test for whether the text buffer
is empty.

Reported-by: Michał Berger <michallinuxstuff@gmail.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-12-03 10:07:58 +01:00
Ron Yorston 71df2d3589 hush: allow hush to run embedded scripts
Embedded scripts require a shell to be present in the BusyBox
binary.  Allow either ash or hush to be used for this purpose.
If both are enabled ash takes precedence.

The size of the binary is unchanged in the default configuration:
both ash and hush are present but support for embedded scripts
isn't compiled into hush.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-27 16:13:07 +01:00
Ron Yorston 31a04d91c2 docs: add embedded-scripts.txt
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-27 12:33:28 +01:00
Ron Yorston 2d217799e8 build system: prevent duplicate applet names
The embedded script feature makes it easier to create applets with
duplicate names.  Currently in such cases the build succeeds but
the resulting executable doesn't work as the developer intended.

Catch duplicate names when the applet tables are being generated
and make the build fail.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-27 10:47:06 +01:00
Ron Yorston 7b42f8fc76 Tweaks to build process for embedded scripts
- Force a rebuild if a script in applets_sh is changed.

- Move the dummy usage messages for custom applets to usage.h and
  change the name from 'dummy' to 'scripted'.

- Hide an error from gen_build_files.sh if an embed directory exists
  but is empty.

- Tidy up embedded_scripts script.

v2: Remove a couple of unnecessary tests in embedded_scripts, as
    pointed out by Xabier Oneca.
    Drop the stripping of comments.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-27 10:38:10 +01:00
Ron Yorston af694a4b29 Ensure build works when KBUILD_OUTPUT is set, closes 11511
The build process for embedded scripts didn't have consistent
support for saving output to a different directory.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-18 19:34:39 +01:00
Ron Yorston d1b2ae2d04 busybox: add '--show SCRIPT' option to display scripts
Add an option to allow the content of embedded scripts to be
displayed.  This includes applet scripts, custom scripts and the
.profile script.

function                                             old     new   delta
busybox_main                                         624     701     +77
find_script_by_name                                    -      24     +24
scripted_main                                         41      35      -6
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 101/-6)             Total: 95 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-18 19:19:29 +01:00
Ron Yorston 3778898f97 Treat custom and applet scripts as applets
BusyBox has support for embedded shell scripts.  Two types can be
distinguished:  custom scripts and scripts implementing applets.

Custom scripts should be placed in the 'embed' directory at build
time.  They are given a default applet configuration and appear
as applets to the user but no further configuration is possible.

Applet scripts are integrated with the BusyBox build system and
are intended to be used to ship standard applets that just happen
to be implemented as scripts.  They can be configured at build time
and appear just like native applets.

Such scripts should be placed in the 'applets_sh' directory.  A stub
C program should be written to provide the usual applet configuration
details and placed in a suitable subsystem directory.  It may be
helpful to have a configuration option to enable any dependencies the
script requires:  see the 'nologin' applet for an example.

function                                             old     new   delta
scripted_main                                          -      41     +41
applet_names                                        2773    2781      +8
applet_main                                         1600    1604      +4
i2cdetect_main                                       672     674      +2
applet_suid                                          100     101      +1
applet_install_loc                                   200     201      +1
applet_flags                                         100     101      +1
packed_usage                                       33180   33179      -1
tryexec                                              159     152      -7
evalcommand                                         1661    1653      -8
script_names                                           9       -      -9
packed_scripts                                       123     114      -9
complete_cmd_dir_file                                826     811     -15
shellexec                                            271     254     -17
find_command                                        1007     990     -17
busybox_main                                         642     624     -18
run_applet_and_exit                                  100      78     -22
find_script_by_name                                   51       -     -51
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 6/9 up/down: 58/-174)          Total: -116 bytes
   text	   data	    bss	    dec	    hex	filename
 950034	    477	   7296	 957807	  e9d6f	busybox_old
 949918	    477	   7296	 957691	  e9cfb	busybox_unstripped

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-17 21:16:33 +01:00
Ron Yorston e6a63bf683 ash: ensure variables are fully initialised when unset
When a variable is unset by calling setvar(name, NULL, 0) the code
to initialise the new, empty variable fails to initialise the last
character of the string.

Attempts to read the contents of the unset variable will result
in the uninitialised character at the end of the string being
accessed.

For example, running BusyBox under Valgrind and unsetting PATH:

$ valgrind ./busybox_unstripped sh
==21249== Memcheck, a memory error detector
==21249== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==21249== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==21249== Command: ./busybox_unstripped sh
==21249==
/data2/git/build_fix_8721 $ unset PATH
/data2/git/build_fix_8721 $ 0
==21249== Conditional jump or move depends on uninitialised value(s)
==21249==    at 0x451371: path_advance (ash.c:2555)
==21249==    by 0x456E22: find_command (ash.c:13407)
==21249==    by 0x458425: evalcommand (ash.c:10139)
==21249==    by 0x454CBC: evaltree (ash.c:9131)
==21249==    by 0x456C80: cmdloop (ash.c:13164)

Closes https://bugs.busybox.net/show_bug.cgi?id=8721

v2: On the dash mailing list Harald van Dijk was kind enough to point
    out a flaw in my reasoning and provide an alternative patch.  Sadly
    his patch adds 2 bytes of bloat.  Using xzalloc to zero the whole
    string gives a bloat of -3 bytes.

function                                             old     new   delta
setvar                                               172     169      -3

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-16 17:28:01 +01:00
Ron Yorston 060f0a050a hush: correct description for HUSH_TICK config option
The HUSH_TICK configuration option enables command substitution,
not process substitution.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-14 11:35:58 +01:00
Ron Yorston 8767c12774 ash: minor fixes
Ensure that login_sh is initialised in procargs even when running
an embedded script.

The argc argument to ash_main isn't unused when embedded scripts
are present.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-06 08:49:11 +01:00
Ron Yorston c339c7f7b3 libarchive: add a function to unpack embedded data
Similar code to unpack embedded data is used to decompress usage
messages, embedded scripts and the config file (in the non-default
bbconfig applet).

Moving this code to a common function reduces the size of the default
build and hides more of the internals of libarchive.

function                                             old     new   delta
unpack_bz2_data                                        -     135    +135
bb_show_usage                                        137     157     +20
get_script_content                                    32      47     +15
unpack_scripts                                       119       -    -119
unpack_usage_messages                                124       -    -124
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/0 up/down: 170/-243)          Total: -73 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-02 14:14:51 +01:00
Ron Yorston c9e161277e lineedit: autocompletion for embedded scripts
function                                             old     new   delta
complete_cmd_dir_file                                811     826     +15

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-01 12:51:10 +01:00
Ron Yorston ca82b5354f ash: in tryexec(), ensure we don't try to run embedded scripts as applets
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-01 11:48:21 +01:00
Ron Yorston 151de441e7 ash: recognize embedded scripts in SH_STANDALONE mode
function                                             old     new   delta
find_script_by_name                                    -      51     +51
shellexec                                            254     271     +17
find_command                                         990    1007     +17
evalcommand                                         1653    1661      +8
doCommands                                          2233    2222     -11
run_applet_and_exit                                  128     100     -28
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 6/4 up/down: 104/-52)            Total: 52 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-01 11:07:26 +01:00
Ron Yorston 552796791f vi: remove duplicated code
At worst show_status_line() might be called needlessly when the
user presses ^L/^R, but I don't think we'll get many complaints
about that.

function                                             old     new   delta
do_cmd                                              4592    4558     -34
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-34)             Total: -34 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-10-31 12:51:51 +01:00
Ron Yorston 1f27fa9838 testsuite: allow tests to work in paths containing spaces
Tweak some tests so they work when the path to the test directory or
$HOME contains spaces.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-04-09 20:35:48 +02:00
Ron Yorston b5820d9fd8 ssl_client: fix option parsing
The wrong character was used to indicate options taking an integer
parameter.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-20 11:41:51 +01:00
Ron Yorston 23286900da lineedit: allow window size tracking to be disabled
function                                             old     new   delta
lineedit_read_key                                    269     261      -8
win_changed                                           47       -     -47
read_line_input                                     3884    3821     -63
cmdedit_setwidth                                      63       -     -63
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 0/2 up/down: 0/-181)           Total: -181 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-02-25 20:09:54 +01:00
Ron Yorston ecaec1dbec testsuite: update busybox and bzcat tests
Test scripts that use CONFIG_* variables need to source .config.
Since this wasn't being done for busybox many tests were skipped.
As a result new failures due to changes in help output were missed.

Also remove some unnecessary echos in the bzcat script.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-02-12 15:32:02 +01:00
Ron Yorston 8d8ee910f0 env: -u option fails due to typo
The -u option is supposed to be allowed to appear multiple times; the
option string supplied to getopt32long requires it to be followed by a
nonnegative integer.

Reported-by: Keith Maxwell <keith.maxwell@gmail.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-12-25 21:36:05 +01:00
Ron Yorston 0b6ec06beb kill: add '--' option to separate options from arguments
Using a negative pid to send TERM to a process group results in an
obscure error:

   $ ./busybox kill -12345
   kill: bad signal name '12345'

This is intended. Manpage says:
ARGUMENTS
       pid    Each pid can be one of four things:
...
              -n     where n is larger than 1.  All processes in process group
                     n are signaled.  When an argument of  the  form  '-n'  is
                     given,  and it is meant to denote a process group, either
                     a signal must be specified first, or the argument must be
                     preceded  by a '--' option, otherwise it will be taken as
                     the signal to send.

However, we did not support "--". Add this capability to BusyBox.

function                                             old     new   delta
kill_main                                            993     999      +6

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-28 14:03:13 +02:00
Ron Yorston 6bafcfb67a tar: fix handling of first argument without '-'
The following no longer works as expected:

   $ ./busybox tar xfz test.tgz
   tar: can't open 'z': No such file or directory

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-23 12:19:44 +02:00
Ron Yorston e837a0dbbe libarchive: fix build failure on NOMMU systems
In the old code fd was an argument, now we need to get the file descriptor
from the xstate structure.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-22 15:41:33 +02:00
Ron Yorston 0ec0fac045 ps: fix build failure if FEATURE_PS_TIME is disabled
The global seconds_since_boot is only defined if FEATURE_PS_TIME
is enabled.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-22 15:39:13 +02:00
Ron Yorston 008fc9499a libbb: remove vdprintf
Two reasons:

* it's only built for GNU C Library versions < 2 (released 1997)

* it isn't used anywhere in BusyBox

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-07-29 17:30:21 +02:00
Ron Yorston be366e5afa ash: support platforms that don't have '%m' printf specifier
The '%m' conversion specifier prints an error message based on the
current value of 'errno'.  It is available in the GNU C library,
Cygwin (since 2012), uClibc and musl.

It is not available in various BSDs, BSD-derived systems (MacOS,
Android) or Microsoft Windows.

Use a symbol defined in platform.h to control how error messages
can be formatted to display the 'errno' message.  On platforms that
support it use '%m'; on other platforms use '%s' and strerror().

On platforms that have '%m' there is essentially no change in the
size of the binary.  Otherwise:

function                                             old     new   delta
redirect                                            1287    1310     +23
xtcsetpgrp                                            27      44     +17
dup2_or_raise                                         34      51     +17
setinputfile                                         267     275      +8
.rodata                                           163379  163371      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/1 up/down: 65/-8)              Total: 57 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-07-28 15:39:26 +02:00
Ron Yorston a165603d24 od_bloaty: fix floating point output
Currently od_bloaty does this:

   $ /bin/echo -en '\x00\x00\x00\x00\x00\x00\x00\x00' | busybox od -f
   od: invalid character 'F' in type string 'fF'
   $ /bin/echo -en '\x00\x00\x00\x00\x00\x00\x00\x00' | busybox od -t fD
   od: invalid character 'D' in type string 'fD'
   $ /bin/echo -en '\x00\x00\x00\x00\x00\x00\x00\x00' | busybox od -t f
   0000000
   0000010

The first two occur because the alphabetic length specifier isn't being
properly skipped.  The third is due to the empty length specifier being
treated as alphabetic so we fall off the end of the FDL_sizeof array with
undetermined consequences.  Coreutils defaults to printing a double in
this case.

With this patch the output is:

   $ /bin/echo -en '\x00\x00\x00\x00\x00\x00\x00\x00' | ./busybox od -f
   0000000   0.0000000e+00   0.0000000e+00
   0000010
   $ /bin/echo -en '\x00\x00\x00\x00\x00\x00\x00\x00' | ./busybox od -t fD
   0000000   0.000000000000000e+00
   0000010
   $ /bin/echo -en '\x00\x00\x00\x00\x00\x00\x00\x00' | ./busybox od -t f
   0000000   0.000000000000000e+00
   0000010

I guess nobody uses BusyBox od to print floating point numbers.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-07-19 13:12:02 +02:00
Ron Yorston 513a2457b6 printf: fix format string sanity check
One of the tests for printf checks for an invalid bare '%' in the
format string:

   $ busybox printf '%' a b c
   printf: %: invalid format

On x86_64 a slightly different test doesn't work correctly:

   $ busybox printf '%' d e f
   printf: invalid number 'd'
   printf: invalid number 'e'
   printf: invalid number 'f'

On other platforms the test fails randomly depending on how the
arguments are laid out in memory.

There are two places in the code where strchr is used to determine if
a character in the format string is valid.  However, strchr also returns
a valid pointer if the character being searched for is the null terminator
thus causing the code to incorrectly suppose that a valid character has
been found.

Add explicit checks for the null terminator.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-07-18 16:00:38 +02:00
Ron Yorston ea7d2f6ec0 ash: fix error code regression
The commit 'ash,hush: set exit code 127 in "sh /does/not/exist" case'
only partly implemented the dash commit '[ERROR] Allow the originator
of EXERROR to set the exit status'.  This resulted in incorrect error
codes for a syntax error:

   $ )
   $ echo $?
   0

or a redirection error for a special builtin:

   $ rm -f xxx
   $ eval cat <xxx
   $ echo $?
   0

Signed-off-by: Ron Yorston <rmy@pobox.com>
Reported-by: Martijn Dekker <martijn@inlv.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-03 11:18:23 +01:00
Ron Yorston 5ccb0e92fa ash: return exit status of nofork applets
The commit 'ash: eval: Return status in eval functions' changed how
exit status is handled in eval functions.  The case of nofork
applets was missed, resulting in the incorrect status potentially
being returned for nofork applets when FEATURE_SH_NOFORK is enabled.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-10-24 01:18:13 +02:00
Ron Yorston 1b0dcc02dd libbb: suppress warning about run_applet_and_exit
When busybox is configured to contain a single applet an unnecessary
declaration of run_applet_and_exit results in a warning.  Move the
declaration to avoid this.

Reported-by: Lauri Kasanen <curaga@operamail.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-07-05 21:21:36 +02:00
Ron Yorston ce824aecf2 libbb: move common code into run_applet_and_exit
Both calls to run_applet_and_exit are followed by the same code
to print an error message and return status 127.  Remove this
duplication and make run_applet_and_exit static.

function                                             old     new   delta
run_applet_and_exit                                  675     667      -8
main                                                 119      92     -27
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-35)             Total: -35 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-06-19 15:16:27 +02:00
Ron Yorston ba12081a9e Allow "busybox <applet>" to work when busybox is disabled
A recent commit made it possible to disable BusyBox's --install
and --list options.  However it also stopped "busybox <applet>
<params>" from working.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-06-18 19:15:20 +02:00
Ron Yorston 84ba50c32f ash: bash-compatible $'...' shouldn't expand in double quotes
Bash doesn't expand its $'...' construct in double quotes:

   $ echo "$'a\tb'"
   $'a\tb'

Change BusyBox ash to do the same.  This also fixes a problem with
here documents where BusyBox ash gave an incorrect result for:

   $ cat <<EOF
   > '$'
   > EOF
   '$'

Reported-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-15 22:16:46 +02:00
Ron Yorston 2b91958dff Rewrite iteration through applet names to save a few bytes
function                                             old     new   delta
run_applet_and_exit                                  758     755      -3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-3)               Total: -3 bytes

In standalone shell mode the saving increases to 17 bytes.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-15 22:13:51 +02:00
Ron Yorston b22061718d find_applet_by_name: loop index should be signed
The loop

   for (j = ARRAY_SIZE(applet_nameofs)-1; j >= 0; j--) {

was intended to terminate when j goes negative, so j needs to be signed.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-04-03 22:29:35 +02:00
Ron Yorston 610c4c385b applet_tables: save space by removing applet name offsets
The array applet_nameofs consumes two bytes per applet.  It encodes

   nofork/noexec flags
   suid flags
   the offset of the applet name in the applet_name string

Change the applet_table build tool to store the flags in two separate
arrays (applet_flags and applet_suid).  Replace applet_nameofs[] with a
smaller version that only stores a limited number of offsets.

This requires changes to the macros APPLET_IS_NOFORK, APPLET_IS_NOEXEC
and APPLET_SUID.

   According to Valgrind the original find_applet_by_name required
   353 cycles per call, averaged over all names.  Adjusting the number
   of known offsets allows space to be traded off against execution time:

      KNOWN_OFFSETS     cycles     bytes (wrt KNOWN_OFFSETS = 0)

           0             9057        -
           2             4604       32
           4             2407       75
           8             1342       98
          16              908      130
          32              884      194

   This patch uses KNOWN_OFFSETS = 8.

v2:
   Remove some dead code from the applet_table tool;
   Treat the applet in the middle of the table as a special case.

v3:
   Use the middle applet to adjust the start of the linear search as
   well as the last applet found.

v4:
   Use an augmented linear search in find_applet_by_name.
   Drop the special treatment of the middle name from get_applet_name:
   most of the advantage now derives from the last stored value.

v5:
   Don't store index in applet_nameofs, it can be calculated.

v6:
   Tweaks by Denys

function                                             old     new   delta
find_applet_by_name                                   25     125    +100
applet_suid                                            -      92     +92
run_applet_no_and_exit                               452     460      +8
run_applet_and_exit                                  695     697      +2
applet_name_compare                                   31       -     -31
applet_nameofs                                       734      14    -720
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 3/1 up/down: 202/-751)         Total: -549 bytes
   text       data        bss        dec        hex    filename
 925464        906      17160     943530      e65aa    busybox_old
 924915        906      17160     942981      e6385    busybox_unstripped

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-03-30 00:44:11 +02:00
Ron Yorston 3e3bfb896e ash: fix corruption of ${#var} if $var contains UTF-8 characters
As reported in bug 8506:

   $ X=abcdÉfghÍjklmnÓpqrstÚvwcyz
   $ echo ${#X}
   abcd26

The result should be 26.

This regression was introduced by:

   <d68d1fb> 2015-05-18 [Ron Yorston]  ash: code shrink around varvalue

The length in characters was being used to discard the contents of
the variable instead of the length in bytes.

URL: https://bugs.busybox.net/8506
Reported-by: Martijn Dekker <martijn@inlv.org>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2016-03-22 18:19:29 -04:00
Ron Yorston 4a79224cfc printf: short-circuit output when argument to %b includes \c
printf wasn't correctly handling \c in an argument to the %b format
specifier.

   printf %bXX OK\\c

returned 'OK\cXX' rather than the expected 'OK'.

function                                             old     new   delta
printf_main                                          886     899     +13

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-01-31 22:23:05 +01:00
Ron Yorston 95ebcf79ff ash: add support for bash 'function' keyword
Where the POSIX shell allows functions to be defined as:

   name () compound-command [ redirections ]

bash adds the alternative syntax:

   function name [()] compound-command [ redirections ]

Implement this in ash's bash compatibility mode.  Most compound
commands work (for/while/until/if/case/[[]]/{}); one exception is:

   function f (echo "no way!")

The other two variants work:

   f() (echo "ok")
   function f() (echo "also ok")

function                                             old     new   delta
parse_command                                       1555    1744    +189
tokname_array                                        232     240      +8
.rodata                                           155612  155566     -46
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 197/-46)           Total: 151 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-11-04 19:30:24 +01:00
Ron Yorston 85405c80a2 ash: copy function tests from hush testsuite
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-11-04 14:48:16 +01:00
Ron Yorston 95650a86d1 ash: allow popredir to be called if the stack is empty
If /tmp/test.sh is a script that tries to run a second script which
happens to be non-executable this:

   command . /tmp/test.sh

causes a seg fault.

This is because clearredir is called in the error path to clear the
stack of redirections.  The normal path then calls popredir, but popredir
fails when the stack is empty.

Reported-by: Bastian Bittorf <bittorf@bluebottle.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-30 22:23:13 +01:00
Ron Yorston 8c55dc79a7 ash: fix EXEXEC status clobbering
evalcommand always clobbers the exit status in case of an EXEXEC
which means that exec always fails with exit status 2 regardless
of what it actually returns.

This patch adds the missing check for EXEXEC so that the correct
exit status is preserved.  It causes the test ash-misc/exec.tests
to succeed.

Based on commit 7f68426 in dash git, by Herbert Xu.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-30 22:19:48 +01:00
Ron Yorston e939856c87 ash: add tests for failures of the exec and command builtins
The exec builtin should return an exit status of 127 if the command
can't be found.  It doesn't:  it returns 2.

If the command builtin is used to source a script that runs a second
script that doesn't exist ash should issue an error.  Instead it seg
faults.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-30 22:19:06 +01:00
Ron Yorston c0e007663d ash: simplify EOF/newline handling in list parser
Processing of here documents in ash has had a couple of breakages
which are now the subject of tests.  This commit should fix both.

It is based on the following commit in dash git by Herbert Xu:

   <7c245aa> [PARSER] Simplify EOF/newline handling in list parser

(See git://git.kernel.org/pub/scm/utils/dash/dash.git)

Reported-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 21:44:11 +01:00
Ron Yorston 6bd2fabc52 Revert "ash: fix a SEGV case in an invalid heredoc" xxx
This reverts commit 7e66102f76 but
leaves the test in place as it's still valid.

Reported-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 21:42:30 +01:00
Ron Yorston 713f07d906 ash: fix error during recursive processing of here document
Save the value of the checkkwd flag to prevent it being clobbered
during recursion.

Based on commit ec2c84d from git://git.kernel.org/pub/scm/utils/dash/dash.git
by Herbert Xu.

function                                             old     new   delta
readtoken                                            190     203     +13
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 13/0)               Total: 13 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 20:45:36 +01:00
Ron Yorston ef2386b80a ash: only allow local variables in functions
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 20:33:44 +01:00
Ron Yorston 3f221113a5 ash: respect -p flag when command builtin is run with -v/-V
The command builtin should only check the default path, not $PATH,
when the -p flag is used along with -v/-V.

Based on commits 65ae84b (by Harald van Dijk) and 29ee27d (by Herbert
Xu) from git://git.kernel.org/pub/scm/utils/dash/dash.git).

function                                             old     new   delta
commandcmd                                            72      87     +15
describe_command                                     437     450     +13
typecmd                                               84      86      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 30/0)               Total: 30 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 20:05:32 +01:00
Ron Yorston 383b885ff7 ash: save a few bytes in code to parse case statements
Based on commit 49b82fc from git://git.kernel.org/pub/scm/utils/dash/dash.git
by Herbert Xu.

function                                             old     new   delta
parse_command                                       1563    1555      -8
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-8)               Total: -8 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 19:36:08 +01:00
Ron Yorston ab80e01cd9 ash: allow newline after variable name in for loop
Newline is a valid delimiter between the variable name and `in`
keyword in for loops.

Based on commit 22e8fb4 from git://git.kernel.org/pub/scm/utils/dash/dash.git
by Herbert Xu.

function                                             old     new   delta
parse_command                                       1568    1563      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-5)               Total: -5 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 19:30:55 +01:00
Ron Yorston 9121510dc6 ash: add test for issue with here document
This used to work but doesn't now:

foo () {
cat <<EOF && { echo "$1" ; }
$1
EOF
}

foo "bar"

Reported-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-29 19:12:03 +01:00
Ron Yorston 8814431aca libiproute: use if_nametoindex
Saves 87 bytes.  Assuming, of course, all platforms have it.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-24 22:04:36 +02:00
Ron Yorston 4d0c1ea478 wget: shrink code if https isn't supported
If FEATURE_WGET_OPENSSL and FEATURE_WGET_SSL_HELPER are both disabled
there's no point in checking for https URLs.

function                                             old     new   delta
P_HTTPS                                                6       -      -6
.rodata                                           155501  155469     -32
parse_url                                            476     423     -53
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/2 up/down: 0/-91)             Total: -91 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-10-13 14:56:22 +02:00
Ron Yorston ca25af9b06 ash: fix slash treatment in expmeta
Commit 549deab caused this sequence of commands:

   mkdir foo
   cd foo
   touch a b
   echo "./"*

to return './*' instead of the expected './a ./b'.  The problem
was caused by the backport of commit 880d952 from dash.  In dash
the issue was fixed by two further commits by Herbert Xu:

<d6d06ff> [EXPAND] Fixed non-leading slash treatment in expmeta
<36f0fa8> [EXPAND] Fix slash treatment in expmeta

(See git://git.kernel.org/pub/scm/utils/dash/dash.git)

Apply these fixes to BusyBox ash, thus causing the new test
glob3.tests to succeed.

function                                             old     new   delta
expmeta                                              469     528     +59

Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-09-04 22:23:54 +02:00
Ron Yorston 26ccd3d062 less: fix botched attempt to use last column
Commit 1ecb996 attempted to make read_lines() use the last column of
the terminal (as re_wrap() did).  There were two problems with this:

- The size of the buffer allocated for lines wasn't increased to allow
  for the extra character.

- The test for width overflow was moved after the point where the
  next character was added to the buffer.  This caused a buffer overflow
  in certain circumstances.

  For example, if the line beyond the end of the display was wider than
  the display read_lines() would initially read the partial line into a
  buffer.  When the user moved down read_lines() would be called again
  to ensure the rest of the line was read.  This would place the next
  character in the partial line before checking for overflow.

  This can be fixed by moving the test for overflow back to where it was
  before commit 1ecb996 and changing the comparison to `>` rather than
  `>=`.

There are two other places where buffers are created without allowing
for width+1 characters.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-08-16 18:54:49 +02:00
Ron Yorston b27cf31003 less: further tweaks to regular file detection
Test explicitly for REOPEN flags:  update_num_lines is called
unconditionally so (num_lines != NOT_REGULAR_FILE) is also true when
num_lines contains a valid number of lines.

The call to fstat doesn't need to be in #if ENABLE_FEATURE_LESS_FLAGS:
the whole function is already in such a test.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-08-03 16:41:19 +02:00
Ron Yorston 1ecb996fd2 less: allow use of last column of terminal
When read_lines tests whether a character will fit on the current
line it checks the *next* character but in case of overflow doesn't
display the *current* one.  This results in the last column of the
terminal never being used.

The test in re_wrap (used when the terminal width changes or line
numbers are enabled/disabled) is different:  it does allow the use
of the final column.

function                                             old     new   delta
read_lines                                           764     770      +6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 6/0)                 Total: 6 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-31 16:22:09 +02:00
Ron Yorston d542d183e1 less: fix line number confusion
Much of the code refers to lines using indices into the flines
array (which splits lines into portions that fit on the terminal).
In some cases this is wrong and actual line numbers should be
used:

- when lines are being truncated rather than wrapped (-S flag)
- when line numbers have been entered by the user

Also fix a bug in numeric input and improve the display at EOF.

function                                             old     new   delta
goto_lineno                                            -     111    +111
cap_cur_fline                                          -     101    +101
buffer_to_line                                         -      56     +56
buffer_up                                             35      66     +31
less_main                                           2606    2615      +9
goto_match                                           125     127      +2
buffer_down                                           81      56     -25
buffer_line                                           64       -     -64
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 3/1 up/down: 310/-89)           Total: 221 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-31 16:22:08 +02:00
Ron Yorston ad1b4d5882 less: add a function to detect when display is at end of file
Add a function to package the test that detects whether enough has
been read from the file to allow a screenful to be displayed.

Also use this to determine when to display '(END)' in the status
line.  The previous code was incomplete and didn't handle truncated
lines (-S flag) properly.

function                                             old     new   delta
at_end                                                 -      63     +63
status_print                                         111     109      -2
read_lines                                           819     764     -55
getch_nowait                                         319     264     -55
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/3 up/down: 63/-112)           Total: -49 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-31 16:22:08 +02:00
Ron Yorston 70b84be9e8 less: rearrange detection of non-regular files
Move the code to detect non-regular files to the point where the
file is being opened.  If num_lines == READING_FILE guarantees
that the file is regular.

Detect when a file becomes unreadable between it first being opened
and the call to update_num_lines.  Mark the file as being non-regular
so we don't try that again.

function                                             old     new   delta
reinitialize                                         197     245     +48
update_num_lines                                     159     127     -32
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 48/-32)             Total: 16 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-31 16:22:07 +02:00
Ron Yorston 159e032bf4 less: move code to count lines into a separate function
function                                             old     new   delta
update_num_lines                                       -     159    +159
m_status_print                                       409     266    -143
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 159/-143)           Total: 16 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-31 16:22:07 +02:00
Ron Yorston ae1a9e899e less: fix numeric input
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-31 15:33:53 +02:00
Ron Yorston 193ba408a4 less: improvements to verbose status messages
Make verbose status messages (-m/-M flags) behave more like the
real `less` command:

- fix display of line numbers so they're correct whether lines are
  being truncated (-S flag) or wrapped.
- don't display total lines or percentage when lines are read from
  stdin:  we don't have that information until we reach EOF.  When
  we do reach EOF the additional information is displayed.
- when lines are read from a file count the total number of lines
  so that we can display percentages.  Counting lines is avoided
  until the information is actually needed.  If the user pages to
  EOF the separate read pass can be avoided entirely.

Fixes Bug 7586

function                                             old     new   delta
m_status_print                                       195     382    +187
safe_lineno                                            -      35     +35
reinitialize                                         172     182     +10
read_lines                                           675     685     +10
buffer_fill_and_print                                178     169      -9
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 3/1 up/down: 242/-9)            Total: 233 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-07-21 22:28:09 +02:00
Ron Yorston 523006798c testsuite: add some tests for ash
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-05-18 10:13:21 +02:00
Ron Yorston 417622cc2e ash: fix breakage of ${v/pat/str}
The commit

   ash: move parse-time quote flag detection to run-time

breaks pattern substitution in parameter expansion.  Fix this and
revise the code so that the different handling of the pattern and
the replacement string takes place in rmescapes rather than the
separate function parse_sub_pattern.

function                                             old     new   delta
rmescapes                                            227     273     +46
static.qchars                                          3       4      +1
subevalvar                                          1177    1157     -20
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 47/-20)             Total: 27 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-05-18 09:59:14 +02:00
Ron Yorston 549deab5ab ash: move parse-time quote flag detection to run-time
Because the parser does not recursively parse parameter expansion
with respect to quotes, we can't accurately determine quote status at
parse time.  This patch works around this by moving the quote detection
to run-time where we do interpret it recursively.

Test case:
   foo=\\ echo "<${foo#[\\]}>"
Old result:
   <\>
New result:
   <>

Do not quote back slashes in parameter expansions outside quotes.

Test case:
   a=/b/c/*
   b=\\
   echo ${a%$b*}
Old result:
   /b/c/*
New result:
   /b/c/

Based on commits 880d952, 7cfd8be, 0d7d660 and a7c21a6 from
git://git.kernel.org/pub/scm/utils/dash/dash.git by Herbert Xu

function                                             old     new   delta
argstr                                              1164    1193     +29
memtodest                                            147     174     +27
subevalvar                                          1153    1177     +24
redirect                                            1279    1282      +3
dolatstr                                               5       7      +2
static.spclchars                                      10       9      -1
expandarg                                            962     960      -2
evalcase                                             273     271      -2
evalcommand                                         1204    1197      -7
rmescapes                                            236     227      -9
preglob                                               27       8     -19
evalvar                                              604     582     -22
cmdputs                                              389     334     -55
readtoken1                                          3163    3061    -102
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 5/9 up/down: 85/-219)          Total: -134 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-05-18 09:57:51 +02:00