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| author | Denys Vlasenko | 2020-02-17 10:24:32 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2020-02-17 10:24:32 +0100 |
| commit | 9ee5892798be81f7a6f3e070ecd52cbf0d55740e (patch) | |
| tree | 9801edcaadd307687df6f33cad7ba7edd1e2b75b /shell | |
| parent | c2ce888030b6b880b3229520a8ff7d7026248a9a (diff) | |
| download | busybox-9ee5892798be81f7a6f3e070ecd52cbf0d55740e.zip busybox-9ee5892798be81f7a6f3e070ecd52cbf0d55740e.tar.gz | |
ash: expand: Fix trailing newlines processing in backquote expanding
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
$(echo "")
2
END
prints "1<newline>2" instead of expected "1<newline><newline>2".
This patch fixes trailing newlines processing in backquote expanding.
Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/ash.c | 2 | ||||
| -rw-r--r-- | shell/ash_test/ash-psubst/tick_in_heredoc.right | 5 | ||||
| -rwxr-xr-x | shell/ash_test/ash-psubst/tick_in_heredoc.tests | 7 | ||||
| -rw-r--r-- | shell/hush_test/hush-psubst/tick_in_heredoc.right | 5 | ||||
| -rwxr-xr-x | shell/hush_test/hush-psubst/tick_in_heredoc.tests | 7 |
5 files changed, 25 insertions, 1 deletions
diff --git a/shell/ash.c b/shell/ash.c index 90496ba..dfe6d1c 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -6578,7 +6578,7 @@ expbackq(union node *cmd, int flag) /* Eat all trailing newlines */ dest = expdest; - for (; dest > (char *)stackblock() && dest[-1] == '\n';) + for (; dest > ((char *)stackblock() + startloc) && dest[-1] == '\n';) STUNPUTC(dest); expdest = dest; diff --git a/shell/ash_test/ash-psubst/tick_in_heredoc.right b/shell/ash_test/ash-psubst/tick_in_heredoc.right new file mode 100644 index 0000000..7e7bac6 --- /dev/null +++ b/shell/ash_test/ash-psubst/tick_in_heredoc.right @@ -0,0 +1,5 @@ +1 + +2 + +3 diff --git a/shell/ash_test/ash-psubst/tick_in_heredoc.tests b/shell/ash_test/ash-psubst/tick_in_heredoc.tests new file mode 100755 index 0000000..c8eb8f4 --- /dev/null +++ b/shell/ash_test/ash-psubst/tick_in_heredoc.tests @@ -0,0 +1,7 @@ +cat <<END +1 +$(echo "") +2 +`echo ""` +3 +END diff --git a/shell/hush_test/hush-psubst/tick_in_heredoc.right b/shell/hush_test/hush-psubst/tick_in_heredoc.right new file mode 100644 index 0000000..7e7bac6 --- /dev/null +++ b/shell/hush_test/hush-psubst/tick_in_heredoc.right @@ -0,0 +1,5 @@ +1 + +2 + +3 diff --git a/shell/hush_test/hush-psubst/tick_in_heredoc.tests b/shell/hush_test/hush-psubst/tick_in_heredoc.tests new file mode 100755 index 0000000..c8eb8f4 --- /dev/null +++ b/shell/hush_test/hush-psubst/tick_in_heredoc.tests @@ -0,0 +1,7 @@ +cat <<END +1 +$(echo "") +2 +`echo ""` +3 +END |