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path: root/applets/applet_tables.c
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2016-04-02build system: finer-grained selection of search speedup table.Denys Vlasenko
KNOWN_APPNAME_OFFSETS=8 versus KNOWN_APPNAME_OFFSETS=0: function old new delta find_applet_by_name 55 136 +81 applet_nameofs - 14 +14 run_applet_and_exit 757 758 +1 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-03-30applet_tables: save space by removing applet name offsetsRon Yorston
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>
2014-09-18false: make "false --help" exit with 1Denys Vlasenko
function old new delta run_applet_no_and_exit 447 445 -2 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2013-11-26build system: do not generate MAX_APPLET_NAME_LEN (unused)Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2012-03-19Fix one-applet build for tcpsvdDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-09-16applet_tables: fix single applet build failure. Closes 4009Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-03-28applet_tables: do not include libbb.h, that header ir for target buildsDenys Vlasenko
...and applets/applet_tables.c is built on *host*. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-08-16*: make GNU licensing statement forms more regularDenys Vlasenko
This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-08-16*: fix "see file License ..." - the file is named LICENSE (in uppercase)Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-06-26build system: do not rebuild ash and hush on any change to any .c fileDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-03-23ash,hush: make it possible to build them individuallyDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2009-10-02Update documentation generator so that it sucks lessDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2008-04-08Avoid linking in printf/bsearch if possible. -20k for static bbox withDenis Vlasenko
"basename", "true" and "false" only. function old new delta full_write2_str - 25 +25 bb_show_usage 183 202 +19 main 883 898 +15 run_applet_and_exit 501 507 +6
2008-04-01shells: do not frocibly enable test, echo and kill _applets_,Denis Vlasenko
just build relevant source and use xxx_main functions. build system: add a special case when we have exactly one applet enabled (makes "true", "false", "basename" REALLY tiny). getopt32: do not use stdio. function old new delta getopt32 1385 1412 +27 make_device 1187 1200 +13 basename_main 120 127 +7 tcpudpsvd_main 1922 1926 +4 testcmd 5 - -5 echocmd 5 - -5 fuser_main 1243 1231 -12 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 4/1 up/down: 51/-22) Total: 29 bytes
2008-02-22small code readability and typo fixesDenis Vlasenko
2008-01-05ps: add conditional support for -o [e]timeDenis Vlasenko
2008-01-04Makefile.help: removing allbareconfig target from helpDenis Vlasenko
applet_tables: fix allnoconfig
2007-12-24nameif: extended matching (Nico Erfurth <masta@perlgolf.de>)Denis Vlasenko
*: whitespace fixes function old new delta prepend_new_eth_table - 304 +304 nameif_main 620 684 +64 cc_macaddr 51 - -51 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 1/0 up/down: 368/-51) Total: 317 bytes
2007-11-29Further optimize applet tables; prettify build outputDenis Vlasenko
text data bss dec hex filename 775923 929 9100 785952 bfe20 busybox_old 775565 929 9100 785594 bfcba busybox_unstripped
2007-11-28forgotten part of previous commitDenis Vlasenko
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