stty: fix option parsing bug (spotted by Sascha Hauer <s.hauer@pengutronix.de>)

doc: add README on shell job control

procps: remove all global variables
   text    data     bss     dec     hex filename
   1462      14      24    1500     5dc busybox.t2/procps/ps.o
   1484       0       0    1484     5cc busybox.t3/procps/ps.o
   3122       0     252    3374     d2e busybox.t1/procps/top.o
   3117       0       0    3117     c2d busybox.t3/procps/top.o

ps: add -o tty and -o rss support
   1373      14      24    1411     583 busybox.t1/procps/ps.o
   1462      14      24    1500     5dc busybox.t2/procps/ps.o

loop device code: readability improvement

switch_root: error_msg -> perror_msg, reduce by 22 bytes while at it.

"Unify base64 handling" is done, remove TODO

make "busybox" w/o args work again, and save 10 bytes in the process.

hush: remove stray semicolon (should change nothing)

ether-wake: save a few more bytes of code

ether-wake: close bug 1317. Reorder fuctions to avoid
forward refs while at it

shells: remove few statics and duplicated code
(much more of the same remains, alas)
function                                             old     new   delta
doset                                                330     332      +2
warn                                                  53      51      -2
onecommand                                           463     461      -2
ioecho                                                40      38      -2
forkexec                                            1412    1410      -2
err                                                   81      79      -2
setdash                                               59      56      -3
flag                                                   4       -      -4
msh_main                                            1389    1384      -5
eval                                                 388     381      -7
subgetc                                              759     747     -12
static.local                                          14       -     -14
b_adduint                                             70      52     -18
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 1/10 up/down: 2/-73)            Total: -71 bytes

style fixes, no code changes

applet.c: ruid is needed only if FEATURE_SUID=y

- we unconditionally need ruid. Fixes build error in line 334

- fix compilation when ENABLE_FEATURE_IP_RULE was off

- fix compilation if ENABLE_FEATURE_DD_IBS_OBS is off

lineedit: state->hist_file doesn't exist if !FEATURE_EDITING_SAVEHISTORY,
#ifdef it out

doc: fix code example which may provoke warning

e2fsprogs: stop using statics in chattr. Minor code shrinkage (-130 bytes)

deluser: add optional support for removing users from groups
(by Tito <farmatito@tiscali.it>)

update style-guide.txt

xargs: simplify word list management

msh: style fixes
shell/README - a place to record things about busybox shells

lineedit: nuke two unused variables and code which sets them
applets: do not even try to read config if run by real root
msh: use named constants (O_RDONLY etc) in open() instead of magic numbers,
     other minor code size reduction.

lash: recognize and use NOFORK applets
lash,hush: fix kill buglet (didn't properly recognize ESRCH)

lineedit: do not try to open NULL history file

hush: use NOFORK applets as appropriate. Net reduction of code size.

teach find_root_device to deal with /dev/ subdirs
(by "Kirill K. Smirnov" <lich@math.spbu.ru>)

dpkg: use nitfields which are a bit closer to typical ushort.
Code size -800.

style fixes

sourse_route_list -> source_route_list

make xsocket die with address family printed (if VERBOSE_RESOLUTION_ERRORS=y)

hush: more style fixes.

hush: comment out and replace bug in set_local_var:
-       if (value == 0 && ++value == 0) {
+       /*if (value == 0 && ++value == 0) ??? -vda */
+       if (value == NULL || value[1] == '\0') {

Style fixes.

shell/: add SUSv3 doc for fast & easy reference

fix typo in comment

find: add support for -delete, -path (by Natanael Copa)

sed: fix escaped newlines in -f; fix multiple -f and -e
(broke when getopt32 was fixed to not reverse the list)

login: fixing my brainfart: xspawn(t_argv) <- was using argv!

make sure we free the grep data as well

lash: "forking" applets are actually can be treated the same way as "non-forked".
Also save a bit of space on trailing NULL array elements.

fix realloc-of-non-malloced pointer, and reduce size while at it

login: remove setpgrp call (makes it work from shell prompt again).
login: sanitize stdio descriptors (we are suid, need to be careful!)
shrink login and set_environment by ~100 bytes.

pass a copy of argv[i] to NOFORK applets (they may permute it etc).
set/save/restore more shared global variables whan call one applet from another

- shrink iproute a bit (-200 bytes). Untested

- add xsendto and use where appropriate; shrink iplink; sanitize libiproute a bit.
  -916 byte

style fixes. No code changes

bb_full_fd_action: remove potential xmalloc from NOFORK path
cat: stop using stdio.h opens
libbb: introduce & use open[3]_or_warn
function                                             old     new   delta
open3_or_warn                                          -      54     +54
bb_cat                                               115     144     +29
open_or_warn                                           -      25     +25
unlzma                                              2404    2412      +8
chattr_main                                          334     339      +5
xstrtoul_range_sfx                                   251     255      +4
telnet_main                                         1514    1510      -4
static.opt                                             4       -      -4
qgravechar                                           122     118      -4
fuser_add_pid                                         61      54      -7
fuser_add_inode                                      154     147      -7
writeFileToTarball                                  1542    1534      -8
refresh                                             1156    1148      -8
do_show                                              856     846     -10
read_leases                                          212     200     -12
setup_redirects                                      236     222     -14
iproute_list_or_flush                               1582    1568     -14
read_config                                          427     411     -16
write_leases                                         284     264     -20
hash_file                                            338     318     -20
copy_file                                           1760    1740     -20
do_iproute                                          2610    2588     -22
bb_full_fd_action                                    320     269     -51
open_to_or_warn                                      103      49     -54
fuser_main                                          1660    1596     -64
.rodata                                           131160  131096     -64
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 4/19 up/down: 125/-423)        Total: -298 bytes

ash: fix kill -l (by Mats Erik Andersson <mats.andersson64@comhem.se>)

fix typo in doc

style fixes, no code changes.

rename: run_applet_by_name -> run_applet_and_exit

- set the scope properly. Thanks to Jean Wolter, who wrote:
busybox ip and the original ip utility behave differently when setting
the following route (verified with ip route show using the original ip
utility):

   ip route add 10.0.0.138 dev eth0

Result for busybox ip:

       # ip route add 10.0.0.138 dev eth0
       # /usr/local/bin/ip route show
       10.0.0.138 dev eth0

Result for ip:

       # /usr/local/bin/ip route add 10.0.0.138 dev eth0
       #  /usr/local/bin/ip route show
       10.0.0.138 dev eth0  scope link

A following "ip route add default via 10.0.0.138" fails for busybox
ip, since the kernel can not find a route to 10.0.0.138 (it replies
with Network is unreachable).

The reasons seems to be that the original ip utility explicitly sets
the scope after parsing all parameters. This is missing in busybox,
the attached patch fixes this. I took this from the original iproute
sources and removed some variables, which are not needed for busybox.

Add NOFORK/NOEXEC documentation.

fix typo in comment

fix misplaced #if

add more convenient defines for [NO]MMU:
"#ifndef BB_NOMMU" is a double negative

random NOMMU fixes. compressed --help really does work for NOMMU! /me happy

Rename two config options:
FEATURE_SH_STANDALONE_SHELL => FEATURE_SH_STANDALONE
FEATURE_EXEC_PREFER_APPLETS => FEATURE_PREFER_APPLETS
Make SH_STANDALONE depend on PREFER_APPLETS.
getopt.c: more randomconfig-induced fixes

xargs: fix my brain fart (resulted in memory leak)

make compressed help code NOMMU- and NOFORK-friendly -
no forking anymore, bunzip2 unpack routine now does all it in memory.

make a few struct bb_applet members conditional
rename sllep_and_die -> xfunc_die
make fflush_stdout_and_exit NOFORK-safe
fix some buglets found by randomconfig

- mv ip*_main into ip.c; use a dispatcher to save on needless duplication.
  Saves a minor 12b.

- use enum for the OPs as suggested by vda. No obj-code changes.

- forgot this hunk that corrects the usage text of ip

- rewrite the ip applet to be less bloaty
- mark libiproute's matches() as deprecated. Convert to index_in_(sub)str_array()!
   text    data     bss     dec     hex filename
    314       0       0     314     13a ip.o.orig
    200       0       0     200      c8 ip.o
Using a smallint for the key would save another byte.

- add ATTRIBUTE_DEPRECATED for functions that should be removed in the future.
  This is ment to provide means to point at cruft marked for cleanup.

one-liner: fix indentation

bunzip2: big style cleanup. No code changes apart from one s/write/safe_write/
(verified with objdump).

echo: fix regression ("echo" with no arguments didn't print newline.
echo: use fputs if no options are given. Code growth ~15 bytes.

Old:
# time ./busybox find $bigdir -exec echo {} \; >/dev/null
real    0m2.038s
user    0m0.761s
sys     0m0.953s

New:
# time ./busybox find $bigdir -exec echo {} \; >/dev/null
real    0m1.781s
user    0m0.781s
sys     0m0.939s

For comparison: without NOFORK:
# time find $bigdir -exec echo {} \; >/dev/null
real    1m51.129s
user    0m38.442s
sys     1m3.350s

audit small applets and mark some of them as NOFORK.
Put big scary warnings in relevant places.

style fixes. No code changes.

- very minor shrinkage (-3b)

- use skip_non_whitespace() where appropriate

- add prototype for str_tolower()

- add libbb function str_tolower to convert a string to lowercase.
- shrink wget a bit

make xfunctions optionally longjump instead of exit.
use it for making NOFORK more practical.
touch: make it a NOFORK applet

factor out NOFORK/NOEXEC code from find. Use it for xargs too.

xargs: shrink code, ~80 bytes
applets.h: +#undef APPLET_NOEXEC

wait4pid: if passed with pid < 0, do not set errno - it is already set by exec!

Implement first instance of NOFORK applet - echo
find: use NOFORK/NOEXEC; small -exec buglet also eliminated
vfork_daemon_rexec: honor PREFER_APPLETS
echo: small size improvements

find -exec echo {} \; with PREFER_APPLETS=y runs 4 times faster

busybox: fix "<applet>: applet not found" message

Improve STANDALONE_SHELL. "safe" applets are renamed NOEXEC applets
and now this fact is recorded in applets.h, not ash.c.

Several fixes to "--help + STANDALONE_SHELL" scenarios.

function                                             old     new   delta
run_current_applet_and_exit                            -     355    +355
arith                                               2064    2073      +9
refresh                                             1148    1156      +8
getopt32                                            1068    1073      +5
telnet_main                                         1510    1514      +4
md5_sha1_sum_main                                    565     566      +1
xstrtoul_range_sfx                                   255     251      -4
packed_usage                                       22523   22514      -9
tryexec                                              255     203     -52
static.safe_applets                                  152       -    -152
.rodata                                           131320  131128    -192
run_applet_by_name                                   869     506    -363
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 5/5 up/down: 382/-772)         Total: -390 bytes

./busybox ash -c 'i=20000; while test $i != 0; do touch z; i=$((i-1)); done'
runs more than twice as fast with STANDALONE_SHELL versus without.

msh: smallish code shrinkage; cosmetics

merge busybox.c into applets.c

applets.h: de-obfuscate

add some missed statics on constant objects.
fix few #ifndef ENABLE_xxx

# size busybox_old busybox_unstripped
   text    data     bss     dec     hex filename
 677152    2920   18208  698280   aa7a8 busybox_old
 676420    2920   18208  697548   aa4cc busybox_unstripped

adding small script, mostly for documentational purposes

getopt32: fix llist_t options ordering. llist_rev is not unused.

function                                             old     new   delta
tar_main                                             705     695     -10
sort_main                                            928     918     -10
decode_format_string                                 886     876     -10
run_parts_main                                       197     185     -12
ps_main                                              513     500     -13
wget_main                                           2764    2750     -14
awk_main                                            1014    1000     -14
od_main                                             2886    2866     -20
llist_rev                                             25       -     -25
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/8 up/down: 0/-128)           Total: -128 bytes

find: fix -prune more. Add big comment about it.

find: fix handling of -prune
recursive_actions: uppercase flag constants

busybox.net: micro fix

busybox.net: update "screenshot"

getopt: use getopt32 for option parsing - inspired by patch by
        Mats Erik Andersson <mats.andersson64@comhem.se>
function                                             old     new   delta
getopt_main                                          809     810      +1
static.BUFFER                                          4       -      -4
shell                                                  8       4      -4
quote                                                  4       -      -4
quiet_output                                           4       -      -4
quiet_errors                                           4       -      -4
long_options_nr                                        4       -      -4
long_options_length                                    4       -      -4
long_options                                         388     384      -4
alternative                                            4       -      -4
shortopts                                             15       -     -15
normalize                                            243     220     -23
.rodata                                           131832  131800     -32
add_longopt                                          200       -    -200
------------------------------------------------------------------------------
(add/remove: 0/9 grow/shrink: 1/4 up/down: 1/-306)           Total: -305 bytes

docs: "how to add a patch"

libiproute: audit callgraph, shortcut error paths into die() functions.
Kill a few statics, made other globals smaller:
oneline is smallint, _SL_ is char

function                                             old     new   delta
print_tunnel                                         693     731     +38
print_route                                         1775    1777      +2
print_addrinfo                                      1495    1497      +2
ipaddr_list_or_flush                                2826    2828      +2
oneline                                                4       1      -3
_SL_                                                   4       1      -3
ipaddr_modify                                       1476    1472      -4
parse_address                                        124     119      -5
ip_parse_common_args                                 429     423      -6
on_off                                                53      46      -7
do_del_ioctl                                         113     106      -7
do_add_ioctl                                         120     113      -7
do_show                                              864     856      -8
iprule_list                                          157     148      -9
do_iptunnel                                          310     299     -11
do_add                                               143     126     -17
get_ctl_fd                                            95      76     -19
set_address                                          108      84     -24
ip_main                                              351     323     -28
static.ifr                                            32       -     -32
parse_args                                          1992    1949     -43
iproute_list_or_flush                               1673    1582     -91
do_iplink                                           1583    1485     -98
filter                                               280       -    -280
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 4/18 up/down: 44/-702)         Total: -658 bytes

udhcp: MAC_BCAST_ADDR and blank_chaddr are in fact constant, move to rodata.
a few global variables reduced to smallints
function                                             old     new   delta
add_lease                                             75     227    +152
static.blank_chaddr                                    -      16     +16
MAC_BCAST_ADDR                                         -       6      +6
sockfd                                                 4       8      +4
udhcp_run_script                                    1153    1155      +2
state                                                  8       5      -3
listen_mode                                            4       1      -3
perform_release                                      152     148      -4
fd                                                     8       4      -4
blank_chaddr                                          16       -     -16
udhcpc_main                                         2518    2497     -21
.rodata                                           131864  131832     -32
oldest_expired_lease                                  61       -     -61
clear_lease                                          127       -    -127
------------------------------------------------------------------------------
(add/remove: 2/3 grow/shrink: 3/6 up/down: 180/-271)          Total: -91 bytes

comm: eliminate statics

random small shrinkage and elimination of statics