diff mbox series

parser: Fix alias expansion after heredoc or newlines

Message ID 20200428141958.GA18579@gondor.apana.org.au (mailing list archive)
State Accepted
Delegated to: Herbert Xu
Headers show
Series parser: Fix alias expansion after heredoc or newlines | expand

Commit Message

Herbert Xu April 28, 2020, 2:19 p.m. UTC 
The following patch is meant to be applied on top of:

https://patchwork.kernel.org/patch/11512439/

---8<---
This script should print OK:

	alias a="case x in " b=x
	a
	b) echo BAD;; esac

	alias BEGIN={ END=}
	BEGIN
		cat <<- EOF > /dev/null
			$(:)
		EOF
	END

	: <<- EOF &&
		$(:)
	EOF
	BEGIN
		echo OK
	END

However, because the value of checkkwd is either zeroed when it
shouldn't, or isn't zeroed when it should, dash currently gets
it wrong in every case.

This patch fixes it by saving checkkwd and zeroing it where needed.

Suggested-by: Harald van Dijk <harald@gigawatt.nl>
Reported-by: Harald van Dijk <harald@gigawatt.nl>
Reported-by: Martijn Dekker <martijn@inlv.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff mbox series

Patch

diff --git a/src/parser.c b/src/parser.c
index 5c9e9a0..be84f8b 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -704,10 +704,14 @@  top:
 	if (kwd & CHKNL) {
 		while (t == TNL) {
 			parseheredoc();
+			checkkwd = 0;
 			t = xxreadtoken();
 		}
 	}
 
+	kwd |= checkkwd;
+	checkkwd = 0;
+
 	if (t != TWORD || quoteflag) {
 		goto out;
 	}
@@ -725,7 +729,7 @@  top:
 		}
 	}
 
-	if (checkkwd & CHKALIAS) {
+	if (kwd & CHKALIAS) {
 		struct alias *ap;
 		if ((ap = lookupalias(wordtext, 1)) != NULL) {
 			if (*ap->val) {
@@ -735,7 +739,6 @@  top:
 		}
 	}
 out:
-	checkkwd = 0;
 #ifdef DEBUG
 	if (!alreadyseen)
 	    TRACE(("token %s %s\n", tokname[t], t == TWORD ? wordtext : ""));