Dash was incorrectly handling empty aliases. When attempting to use an
empty alias with nothing else, I'm (incorrectly) prompted for more
input:
```
$ alias empty=''
$ empty
>
```
Other shells (e.g., bash, yash) correctly handle the lone, empty alias as an
empty command:
```
$ alias empty=''
$ empty
$
```
This patch fixes the parser to handle the case where an alias is empty,
i.e., produces no token.
Signed-off-by: Michael Greenberg <michael.greenb...@pomona.edu>
diff --git a/src/parser.c b/src/parser.c
index 1f9e8ec..a1d6116 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -470,6 +470,7 @@ next_case:
break;
case TWORD:
case TREDIR:
+ case TNL: /* necessary for empty aliases */
tokpushback++;
return simplecmd();
}
@@ -717,6 +718,7 @@ top:
}
}
+ignorenl: /* empty alias? */
if (t != TWORD || quoteflag) {
goto out;
}
@@ -739,8 +741,11 @@ top:
if ((ap = lookupalias(wordtext, 1)) != NULL) {
if (*ap->val) {
pushstring(ap->val, ap);
+ goto top;
+ } else {
+ t = xxreadtoken();
+ goto ignorenl;
}
- goto top;
}
}
out:
