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2018-04-02ash: parser: Add syntax stack for recursive parsingDenys Vlasenko
This closes 10821. Upstream patch: From: Herbert Xu <herbert@gondor.apana.org.au> Date: Fri, 9 Mar 2018 00:14:02 +0800 parser: Add syntax stack for recursive parsing Without a stack of syntaxes we cannot correctly these two cases together: "${a#'$$'}" "${a#"${b-'$$'}"}" A recursive parser also helps in some other corner cases such as nested arithmetic expansion with paratheses. This patch adds a syntax stack allocated from the stack using alloca. As a side-effect this allows us to remove the naked backslashes for patterns within double-quotes, which means that EXP_QPAT also has to go. This patch also fixes removes any backslashes that precede right braces when they are present within a parameter expansion context, and backslashes that precede double quotes within inner double quotes inside a parameter expansion in a here-document context. The idea of a recursive parser is based on a patch by Harald van Dijk. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> var_bash3, var_bash4 and var_bash6 tests are updated with the output given by bash-4.3.43 With this patch, the following tests now pass for ash: dollar_repl_slash_bash2.tests squote_in_varexp2.tests squote_in_varexp.tests var_bash4.tests function old new delta readtoken1 2615 2874 +259 synstack_push - 54 +54 evalvar 574 571 -3 rmescapes 330 310 -20 subevalvar 1279 1258 -21 argstr 1146 1107 -39 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/4 up/down: 313/-83) Total: 230 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-04-01hush: update information comment about heredoc discrepancyDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-04-01libbb: new function bb_die_memory_exhaustedDenys Vlasenko
function old new delta bb_die_memory_exhausted - 10 +10 xstrdup 28 23 -5 xsetenv 27 22 -5 xrealloc 32 27 -5 xputenv 22 17 -5 xmalloc 30 25 -5 xfdopen_helper 40 35 -5 xasprintf 44 39 -5 wget_main 2387 2382 -5 open_socket 54 49 -5 glob_brace 419 414 -5 bb_get_chunk_from_file 146 141 -5 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/11 up/down: 10/-55) Total: -45 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-04-01hush: add a comment where we differ from bash wrt heredoc EOF mark handlingDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-04-01parser: Fix backquote support in here-document EOF markDenys Vlasenko
Upstream commit: Author: Herbert Xu <herbert@gondor.apana.org.au> Date: Thu Mar 15 18:27:30 2018 +0800 parser: Fix backquote support in here-document EOF mark Currently using backquotes in a here-document EOF mark is broken because dash tries to do command substitution on it. This patch fixes it by checking whether we're looking for an EOF mark during tokenisation. Reported-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> With added fix for quoted-ness of the EOF mark. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-04-01ash,hush: handle a few more bkslash-newline casesDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-31shells: fix var_LINENO1.tests false positive, add it to ash tests tooDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-31hush: fix heredoc_bkslash_newline1.tests failureDenys Vlasenko
function old new delta parse_stream 2787 2827 +40 builtin_type 117 115 -2 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-31ash: use pgetc_eatbnl() in more placesDenys Vlasenko
Part of upstream commit: Date: Thu Mar 8 08:37:11 2018 +0100 Author: Harald van Dijk <harald@gigawatt.nl> parser: use pgetc_eatbnl() in more places dash has a pgetc_eatbnl function in parser.c which skips any backslash-newline combinations. It's not used everywhere it could be. There is also some duplicated backslash-newline handling elsewhere in parser.c. Replace most of the calls to pgetc() with calls to pgetc_eatbnl() and remove the duplicated backslash-newline handling. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Not adding "readtoken1(pgetc_eatbnl(), DQSYNTAX..." changes, since readtoken1() handles the "starts with backslash + newline" case itself. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-31ash: 'nolog' and 'debug' options cause "$-" to wreak havocMartijn Dekker
Upstream commit: Date: Tue Mar 6 17:40:37 2018 +0000 expand: 'nolog' and 'debug' options cause "$-" to wreak havoc Op 29-03-17 om 20:02 schreef Martijn Dekker: > Bug: if either the 'nolog' or the 'debug' option is set, trying to > expand "$-" silently aborts parsing of an entire argument. > > $ dash -o nolog -c 'set -fuC; echo "|$- are the options|"; set +o nolog; echo "|$- are the options|"' > | > |uCf are the options| > $ dash -o debug -c 'set -fuC; echo "|$- are the options|"; set +o debug; echo "|$- are the options|"' > | > |uCf are the options| This turned out to be easy to fix. The routine producing the "$-" expansion failed to skip options for which there is no option letter, but only a long-form name. In dash, 'nolog' and 'debug' are currently the only two such options. Patch below. - Martijn Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> In bbox ash, pipefail is the option which exhibited this. Signed-off-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-31hush: fix a signedness bugDenys Vlasenko
Testcase: set -- a ""; space=" "; printf "<%s>\n" "$@"$space Before: <a > After: <a> <> It usually does not bite since bbox forces -funsigned-char build. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-30ash,hush: new test dollar_repl_slash_bash2.testsDenys Vlasenko
This fails for ash. hush works. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-30ash: fix "char == CTLfoo" comparison signedness bugDenys Vlasenko
It usually does not bite since bbox forces -funsigned-char build. But for some reason void linux people disabled that. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-30ash: use F_DUPFD_CLOEXEC and O_CLOEXECDenys Vlasenko
function old new delta setjobctl 371 367 -4 setinputfile 226 220 -6 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-10) Total: -10 bytes Based on patch by Mark Marshall <mark.marshall@omicronenergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-28hush: add a FIXME commentDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-28ash,hush: fix "saved" redirected fds still visible in childrenDenys Vlasenko
Based on a patch by Mark Marshall <mark.marshall@omicronenergy.com> function old new delta dup_CLOEXEC - 49 +49 fcntl_F_DUPFD 46 - -46 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-06hush: code shrinkDenys Vlasenko
function old new delta run_pipe 1589 1591 +2 pseudo_exec_argv 374 375 +1 builtin_type 114 115 +1 find_function 8 - -8 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 3/0 up/down: 4/-8) Total: -4 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-02hush: fix a='a\\'; echo "${a%\\\\}"Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-02shell: tweak bkslash_in_varexp.tests, add bkslash_in_varexp1.testsDenys Vlasenko
It turns out bkslash_in_varexp.tests was a bash bug :] ash and hush fail "corrected" bkslash_in_varexp.tests as well, just not as badly as I thought (hush gets half of the cases right). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-03-02shell: two new tests, both fail for ash and hushDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-02-13hush: simplify process_command_subs()Denys Vlasenko
Incidentally, this fixes LINENO bug here: echo "1:${LINENO}" echo "2:`echo; echo`" # was counting lines in the `cmd` output as LINENO++ echo "3:${LINENO}" function old new delta parse_and_run_file 53 71 +18 expand_vars_to_list 1187 1164 -23 setup_file_in_str 25 - -25 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 1/1 up/down: 18/-48) Total: -30 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-02-13ash : fix double-quoted "\z" handlingDenys Vlasenko
function old new delta readtoken1 2602 2608 +6 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-02-08hush: probably fixing a bug in last LINENO fixDenys Vlasenko
I don't have an example of mishandled script, but the logic looked wrong: it could sometimes treat newlines as if they are spaces. function old new delta parse_stream 2788 2787 -1 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-02-08hush: LINENO fixDenys Vlasenko
Script triggering the bug: t=0 echo "at line ${LINENO}" while [ ${t} -lt 10 ]; do echo "at line ${LINENO}" # LINENO was 3 instead of 4 here t=$((t+1)) done function old new delta parse_stream 2754 2788 +34 done_word 711 738 +27 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 61/0) Total: 61 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-30hush: protect against self-modifying trap codeDenys Vlasenko
function old new delta check_and_run_traps 211 236 +25 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-28ash: make it possible to disable "const global ptr" optimizationDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-28shell: handle $((NUM++...) like bash does. Closes 10706Denys Vlasenko
function old new delta evaluate_string 680 729 +49 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-27ash: add LINENO supportDenys Vlasenko
This patch is a backport from dash of the combination of: [SHELL] Add preliminary LINENO support [VAR] Fix varinit ordering that broke fc [SHELL] Improve LINENO support function old new delta parse_command 1604 1677 +73 calcsize 156 223 +67 copynode 196 258 +62 evalcommand 1546 1606 +60 ash_main 1046 1103 +57 lookupvar 51 106 +55 evalcase 269 317 +48 evaltree 501 547 +46 evalfor 156 200 +44 evalsubshell 156 195 +39 raise_error_syntax 11 29 +18 varinit_data 120 132 +12 evalfun 270 280 +10 funcline - 4 +4 cmdtxt 569 572 +3 trapcmd 306 304 -2 ash_vmsg 153 150 -3 startlinno 4 - -4 funcnest 4 - -4 xxreadtoken 263 250 -13 readtoken1 2645 2602 -43 ------------------------------------------------------------------------------ (add/remove: 1/2 grow/shrink: 14/4 up/down: 598/-69) Total: 529 bytes text data bss dec hex filename 932834 481 6864 940179 e5893 busybox_old 933375 481 6856 940712 e5aa8 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-27hush: add HUSH_BASH_SOURCE_CURDIR config option, to be on par with ashDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-27hush: fix dot builtin to not search current directoryDenys Vlasenko
function old new delta builtin_source 182 209 +27 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-26ash: introduce a config option to search current directory for sourced filesDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-25ash testsuite: add two hush tests from last commitDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-25hush: fix two corner cases in ${v/pattern/repl}. Closes 10686Denys Vlasenko
function old new delta expand_one_var 1592 1618 +26 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-25hush: fix handling of $_ (so far it's an ordinary variable, no special meaning)Denys Vlasenko
function old new delta parse_dollar 820 779 -41 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-24ash: add support for command_not_found_handle hook function (bashism)William Pitcock
This implements support for the command_not_found_handle hook function, which is useful for allowing package managers to suggest packages which could provide the command. Unlike bash, however, we ignore exit codes from the hook function and always return the correct POSIX error code (EX_NOTFOUND). function old new delta find_command 911 990 +79 Signed-off-by: William Pitcock <nenolod@dereferenced.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-19hush: fix a case where EXIT trap may modify its code mid-flightDenys Vlasenko
function old new delta hush_exit 93 99 +6 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-19hush: fix build if !BASH_LINENO_VARDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-19hush: implement $LINENO bashismDenys Vlasenko
function old new delta run_pipe 1697 1774 +77 unset_local_var_len 258 301 +43 hush_main 1009 1051 +42 set_local_var 516 554 +38 parse_and_run_file 42 75 +33 i_getch 96 116 +20 .rodata 18858 18876 +18 done_command 106 122 +16 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 8/0 up/down: 287/0) Total: 287 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-15ash: a bit of NOFORK code should only be active if FEATURE_SH_STANDALONE=yDenys Vlasenko
function old new delta evalcommand 1546 1420 -126 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-13shell: echo ${?:0} was fixed sometime ago, enable it in testsDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-13hush: fix raw ^C handlisg in single-quoted stringsDenys Vlasenko
function old new delta parse_stream 2719 2754 +35 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-12hush: add command2.tests from ash testsDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-12hush: tweak command -vV printing code, no logic changesDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-12hush: implement "command -v -V"Denys Vlasenko
function old new delta pseudo_exec_argv 231 374 +143 if_command_vV_print_and_exit - 127 +127 builtin_set 267 273 +6 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/0 up/down: 276/0) Total: 276 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-11hush: implement "command" builtin (no options are supported yet)Denys Vlasenko
function old new delta pseudo_exec_argv 194 231 +37 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-11hush: fix handling of ^C in evalDenys Vlasenko
function old new delta run_list 1044 1259 +215 builtin_eval 45 126 +81 expand_strvec_to_string 91 - -91 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 2/0 up/down: 296/-91) Total: 205 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-11hush: fix handling of raw ^C in scripts: "echo ^C"Denys Vlasenko
function old new delta expand_vars_to_list 1133 1187 +54 parse_stream 2690 2719 +29 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-11hush: remove dead codeDenys Vlasenko
function old new delta done_word 761 711 -50 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-10ash: ALWAYS_INLINE grabstackblock()Denys Vlasenko
function old new delta grabstackblock 5 - -5 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-01-10ash: make ${v:N:M} more robust for very large M by clamping to MIN/MAX_INTDenys Vlasenko
Before this patch, "${v:2:0x100000001}" = "${v:2:1}", and similarly, constructs like "${v:2:9999999999}" may give wrong result due to int overflows. function old new delta substr_atoi - 43 +43 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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