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Upstream commit:
Date: Mon, 29 Apr 2019 19:13:37 +0500
expand: Fix trailing newlines processing in backquote expanding
According to POSIX.1-2008 we should remove newlines only at the end of
the substitution. Newlines-only substitions causes dash to remove
newlines before beggining of the substitution. The following code:
cat <<END
1
$(echo "")
2
END
prints "1<newline>2" instead of expected "1<newline><newline>2".
This patch fixes trailing newlines processing in backquote expanding.
Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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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>
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ash passes these.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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