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2399 Commits

Author SHA1 Message Date
Ron Yorston
5a9d2b6e02 libbb: make '--help' handling more consistent 
Running an applet with '--help' as its only argument is treated
as a special case.  If additional arguments follow '--help' the
behaviour is inconsistent:

- applets which call single_argv() print help and do nothing else;

- applets which call getopt() report "unrecognized option '--help'"
  and print help anyway;

- expr says "expr: syntax error" and doesn't print help;

- printenv silently ignores '--help', prints any other variables
  and doesn't print help;

- realpath says "--help: No such file or directory", prints the path
  of any other files and doesn't print help.

If the first argument is '--help' ignore any other arguments and print
help.  This is more consistent and most likely what the user wanted.

See also commit 6bdfbc4cb (libbb: fix '--help' handling in
FEATURE_SH_NOFORK=y).

function                                             old     new   delta
show_usage_if_dash_dash_help                          75      69      -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-6)               Total: -6 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-08-22 14:05:01 +02:00
Ron Yorston
298ac9507b lineedit: get PWD from ash 
The line editing code and ash disagree when the current directory
is changed to a symbolic link:

   ~ $ mkdir real
   ~ $ ln -s real link
   ~ $ cd link
   ~/real $ pwd
   /home/rmyf36/link

Note the prompt says we're in ~/real.  Bash does:

   [rmy@random ~]$ cd link
   [rmy@random link]$ pwd
   /home/rmyf36/link

Ash uses the name supplied by the user while the line editing code
calls getcwd(3).  The discrepancy can be avoided by fetching the
value of PWD from ash.

Hush calls getcwd(3) when the directory is changed
so there's no disagreement with the line editing code.

There is no standard how shells should handle cd'ing into
symlinks.

function                                             old     new   delta
parse_and_put_prompt                                 838     869     +31

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-07-03 21:41:38 +02:00
Ron Yorston
7d1c7d8337 ash,hush: use HOME for tab completion and prompts 
ash and hush correctly use the value of HOME for tilde expansion.
However the line editing code in libbb obtains the user's home
directory by calling getpwuid().  Thus tildes in tab completion
and prompts may be interpreted differently than in tilde expansion.

When the line editing code is invoked from a shell make it use the
shell's interpretation of tilde.  This is similar to how GNU readline
and bash collaborate.

function                                             old     new   delta
get_homedir_or_NULL                                   29      72     +43
optschanged                                          119     126      +7
hush_main                                           1204    1211      +7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 57/0)               Total: 57 bytes

v2: Always check for HOME before trying the password database:  this
    is what GNU readline does.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-06-26 18:05:50 +02:00
Ron Yorston
95fec31be6 libbb: restore special handling of nomsg errors 
The functions bb_perror_nomsg() and bb_perror_nomsg_and_die() are
used to print error messages where no specific information is
available.  For example:

   $ busybox mktemp -p /
   mktemp: (null): Permission denied

mktemp(3) doesn't tell us the name of the file it tried to create.

However, printing '(null)' is a regression introduced by commit
6937487be (libbb: reduce the overhead of single parameter bb_error_msg()
calls).  Restore the previous behaviour by reverting the changes to
the two functions mentioned:

   $ busybox mktemp -p /
   mktemp: Permission denied

function                                             old     new   delta
bb_perror_nomsg_and_die                                7      14      +7
bb_perror_nomsg                                        7      14      +7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 14/0)               Total: 14 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-06-26 17:17:02 +02:00
Denys Vlasenko
9b6f44e040 style fix 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-05-01 17:06:00 +02:00
Denys Vlasenko
1891fdda59 libbb/sha1: update config help text with new performance numbers 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-18 17:09:51 +01:00
Denys Vlasenko
c2e7780e52 libbb/sha256: explicitly use sha256rnds2's %xmm0 (MSG) argument 
Else, the code seemingly does not use MSG.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-12 00:52:12 +01:00
Denys Vlasenko
1f272c06d0 whitespace fixes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-11 23:03:27 +01:00
Denys Vlasenko
dda77e8376 libbb/sha1: revert last commit: pshufb is a SSSE3 insn, can't use it 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-11 14:53:26 +01:00
Denys Vlasenko
8154146be4 libbb/sha1: shrink unrolled x86-64 code 
function                                             old     new   delta
sha1_process_block64                                3481    3384     -97

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-11 06:08:27 +01:00
Denys Vlasenko
6f56fa1713 libbb/sha: improve comments 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-10 15:38:10 +01:00
Denys Vlasenko
6a6c1c0ea9 whitespace fix 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-09 11:29:23 +01:00
Denys Vlasenko
caa9c4f707 libbb/sha256: code shrink in x86 assembly 
function                                             old     new   delta
sha256_process_block64_shaNI 32-bit                  676     673      -3
sha256_process_block64_shaNI 64-bit                  680     677      -3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-09 01:50:22 +01:00
Denys Vlasenko
11bcea7ac0 libbb/sha256: code shrink in 64-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         701     680     -21

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-09 01:42:49 +01:00
Denys Vlasenko
461a994b09 libbb/sha256: code shrink in 32-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         697     676     -21

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-09 01:30:23 +01:00
Denys Vlasenko
c0ff0d4528 libbb/sha256: code shrink in 32-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         713     697     -16

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-09 00:33:39 +01:00
Denys Vlasenko
eb8d5f3b8f libbb/sha1: shrink x86 hardware accelerated hashing (32-bit) 
function                                             old     new   delta
sha1_process_block64_shaNI                           511     507      -4

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-08 15:34:02 +01:00
Denys Vlasenko
eb52e7fa52 libbb/sha1: shrink x86 hardware accelerated hashing (32-bit) 
function                                             old     new   delta
sha1_process_block64_shaNI                           517     511      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-08 15:23:26 +01:00
Denys Vlasenko
71a1cccaad libbb/sha1: shrink x86 hardware accelerated hashing 
function                                             old     new   delta
sha1_process_block64_shaNI 32-bit                    524     517      -7
sha1_process_block64_shaNI 64-bit                    510     508      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-08 08:22:17 +01:00
Denys Vlasenko
4923f74e58 libbb/sha1: shrink unrolled x86-64 code 
function                                             old     new   delta
sha1_process_block64                                3482    3481      -1
.rodata                                           108460  108412     -48
------------------------------------------------------------------------------
(add/remove: 1/4 grow/shrink: 0/2 up/down: 0/-49)             Total: -49 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-08 03:29:16 +01:00
Denys Vlasenko
c193cbd6df libbb/sha1: shrink and speed up unrolled x86-64 code 
function                                             old     new   delta
sha1_process_block64                                3514    3482     -32

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-07 02:34:04 +01:00
Denys Vlasenko
987be932ed *: slap on a few ALIGN_PTR where appropriate 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-06 20:07:12 +01:00
Denys Vlasenko
ca466f385a *: slap on a few ALIGN* where appropriate 
The result of looking at "grep -F -B2 '*fill*' busybox_unstripped.map"

function                                             old     new   delta
.rodata                                           108586  108460    -126
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-126)           Total: -126 bytes
   text	   data	    bss	    dec	    hex	filename
 970412	   4219	   1848	 976479	  ee65f	busybox_old
 970286	   4219	   1848	 976353	  ee5e1	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-06 19:53:10 +01:00
Denys Vlasenko
4f40735c87 libbb/sha256: code shrink in 32-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         722     713      -9

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-06 00:56:13 +01:00
Denys Vlasenko
31c1c31077 libbb/sha256: code shrink in 64-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         706     701      -5

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-06 00:33:42 +01:00
Denys Vlasenko
a1429fbb8c libbb/sha256: code shrink in 64-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         730     706     -24

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-03 15:17:42 +01:00
Denys Vlasenko
de6cb4bed8 libbb/sha256: code shrink in 32-bit x86 
function                                             old     new   delta
sha256_process_block64_shaNI                         747     722     -25

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-03 15:11:23 +01:00
Denys Vlasenko
6472ac9428 libbb/sha256: optional x86 hardware accelerated hashing 
64 bit:
function                                             old     new   delta
sha256_process_block64_shaNI                           -     730    +730
.rodata                                           108314  108586    +272
sha256_begin                                          31      83     +52
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 2/0 up/down: 1055/-1)          Total: 1054 bytes

32 bit:
function                                             old     new   delta
sha256_process_block64_shaNI                           -     747    +747
.rodata                                           104318  104590    +272
sha256_begin                                          29      84     +55
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 2/0 up/down: 1075/-1)          Total: 1074 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-02-03 14:58:02 +01:00
Denys Vlasenko
205042c07a libbb/sha1: in unrolled x86-64 code, pass initial W[] in registers, not on stack 
This can be faster on some CPUs.
On Skylake, evidently load latency from L1 (or store-to-load
forwarding in LSU) is fast enough to completely hide
memory reference latencies here.

function                                             old     new   delta
sha1_process_block64                                3495    3514     +19

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-25 17:21:45 +01:00
Denys Vlasenko
99e22d230d cut: build fix for FEATURE_CUT_REGEX 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-24 07:07:17 +01:00
Denys Vlasenko
39369ff460 libbb/sha1: use SSE2 in unrolled x86-64 code. ~10% faster 
function                                             old     new   delta
.rodata                                           108241  108305     +64
sha1_process_block64                                3502    3495      -7
------------------------------------------------------------------------------
(add/remove: 5/0 grow/shrink: 1/1 up/down: 64/-7)              Total: 57 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-23 12:57:27 +01:00
Denys Vlasenko
1e825acf8d libbb: shrink lineedit_read_key() 
function                                             old     new   delta
lineedit_read_key                                    237     231      -6

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-18 00:36:42 +01:00
Denys Vlasenko
12566e7f9b ash,hush: fix handling of SIGINT while waiting for interactive input 
function                                             old     new   delta
lineedit_read_key                                    160     237     +77
__pgetc                                              522     589     +67
fgetc_interactive                                    244     309     +65
safe_read_key                                          -      39     +39
read_key                                             588     607     +19
record_pending_signo                                  23      32      +9
signal_handler                                        75      81      +6
.rodata                                           104312  104309      -3
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 6/1 up/down: 282/-3)            Total: 279 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-17 11:46:23 +01:00
Denys Vlasenko
c2788f88f4 libbb: introduce and use chdir_or_warn() 
function                                             old     new   delta
chdir_or_warn                                          -      37     +37
send_cgi_and_exit                                    720     711      -9
xchdir                                                27      15     -12
setup_environment                                    233     217     -16
fork_job                                             449     433     -16
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/4 up/down: 37/-53)            Total: -16 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-13 12:56:10 +01:00
Denys Vlasenko
931c55f9e2 libbb: invert the meaning of SETUP_ENV_NO_CHDIR -> SETUP_ENV_CHDIR 
Double negatives are hard to grok.

function                                             old     new   delta
login_main                                           986     988      +2
su_main                                              474     470      -4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 2/-4)               Total: -2 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-13 12:50:48 +01:00
Denys Vlasenko
d162a7b978 sulogin: increase util-linux compatibility 
Change to root's HOME. Set some envvars. Steal ctty if necessary and possible.

function                                             old     new   delta
sulogin_main                                         240     340    +100
setup_environment                                    225     233      +8
su_main                                              479     474      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 108/-5)            Total: 103 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-12 23:19:11 +01:00
Denys Vlasenko
143356876b libbb/sha1: add a comment 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-08 22:43:24 +01:00
Denys Vlasenko
e7ff29402d libbb/sha1: simplify cpuid code 
function                                             old     new   delta
sha1_begin                                           107     106      -1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-08 01:25:23 +01:00
Denys Vlasenko
805ececa61 whitespace fix 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-08 00:41:09 +01:00
Denys Vlasenko
0bab5da37e libbb/sha1: tweak comments 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-07 14:55:31 +01:00
Denys Vlasenko
a96ccbefe4 libbb/sha1: optional i686 hardware accelerates hashing 
function                                             old     new   delta
sha1_process_block64_shaNI                             -     524    +524
sha1_begin                                            57     114     +57
.rodata                                           104353  104369     +16
static.shaNI                                           -       1      +1
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 2/0 up/down: 598/0)             Total: 598 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-07 01:32:13 +01:00
Denys Vlasenko
711e20ecb8 libbb/sha1: optional x86-64 hardware accelerates hashing 
function                                             old     new   delta
sha1_process_block64_shaNI                             -     510    +510
sha1_begin                                            52     107     +55
.rodata                                           108285  108301     +16
static.shaNI                                           -       1      +1
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 2/0 up/down: 582/0)             Total: 582 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-07 00:43:59 +01:00
Denys Vlasenko
6062c0d19b libbb: change xstrndup, xmemdup to take size_t as size parameter 
Also, remove entirely usually-disabled paranoia check (was also using
wrong config option to enable itself).

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-05 23:03:54 +01:00
Denys Vlasenko
db5546ca10 libbb: code shrink: introduce and use [_]exit_SUCCESS() 
function                                             old     new   delta
exit_SUCCESS                                           -       7      +7
_exit_SUCCESS                                          -       7      +7
run_pipe                                            1562    1567      +5
pseudo_exec_argv                                     399     400      +1
finish                                                86      87      +1
start_stop_daemon_main                              1109    1107      -2
shutdown_on_signal                                    38      36      -2
runsv_main                                          1662    1660      -2
redirect                                            1070    1068      -2
read_line                                             79      77      -2
pause_and_low_level_reboot                            54      52      -2
list_i2c_busses_and_exit                             483     481      -2
less_exit                                             12      10      -2
identify                                            4123    4121      -2
grep_file                                           1161    1159      -2
getty_main                                          1519    1517      -2
fsck_minix_main                                     2681    2679      -2
free_session                                         132     130      -2
fdisk_main                                          4739    4737      -2
clean_up_and_exit                                     53      51      -2
bsd_select                                          1566    1564      -2
bb_daemonize_or_rexec                                198     196      -2
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/17 up/down: 21/-34)           Total: -13 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-05 22:16:06 +01:00
Denys Vlasenko
dfd8aafcf5 libbb: fflush_stdout_and_exit(0) still exits with _error_ (not 0!) if fflush fails 
function                                             old     new   delta
fflush_stdout_and_exit                                36      40      +4

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-04 23:36:16 +01:00
Denys Vlasenko
31f45c1b36 libbb: factor out fflush_stdout_and_exit(EXIT_SUCCESS) 
function                                             old     new   delta
fflush_stdout_and_exit_SUCCESS                         -       7      +7
xxd_main                                             890     888      -2
vlock_main                                           353     351      -2
uuencode_main                                        318     316      -2
uniq_main                                            427     425      -2
uname_main                                           250     248      -2
sort_main                                            853     851      -2
shuf_main                                            500     498      -2
route_main                                           238     236      -2
readlink_main                                        113     111      -2
nice_main                                            156     154      -2
last_main                                            957     955      -2
ipcs_main                                            960     958      -2
env_main                                             209     207      -2
chrt_main                                            464     462      -2
cal_main                                             921     919      -2
baseNUM_main                                         650     648      -2
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/16 up/down: 7/-32)            Total: -25 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-04 23:31:58 +01:00
Denys Vlasenko
c3cfcc9242 libbb/sha1: x86_64 version: reorder prologue/epilogue insns 
Not clear exactly why, but this increases hashing speed
on Skylake from 454 MB/s to 464 MB/s.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-04 01:45:52 +01:00
Denys Vlasenko
7abb2bb96e libbb/sha1: x86_64 version: tidying up, no code changes 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-03 17:02:48 +01:00
Denys Vlasenko
4387077f8e typo fix 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-03 13:14:09 +01:00
Denys Vlasenko
947bef0dea libbb/sha1: x86_64 version: generate from a script, optimize a bit 
function                                             old     new   delta
sha1_process_block64                                3569    3502     -67

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
 2022-01-03 13:10:30 +01:00