commit 4f801be05521d52e3e5a43b3ed4b4a1206ed871e
from: Igor Burago <ib@iburago.org>
via: Dan Cross <crossd@gmail.com>
date: Wed Sep 07 13:30:40 2022 UTC

plumber: set match variables past the first non-matching subexpression

Fixes #563.

commit - 28e91cd8798fd55993e98c83e577dd1d82955257
commit + 4f801be05521d52e3e5a43b3ed4b4a1206ed871e
blob - 13ebe768f7d1b89469e1be562fd1cc9d0428aeed
blob + 4cb32cc650c8ae501fdc1c9e688effcd0bf1f446
--- src/cmd/plumb/match.c
+++ src/cmd/plumb/match.c
@@ -45,12 +45,12 @@ setvar(Resub rs[10], char *match[10])
 	for(i=0; i<10; i++){
 		free(match[i]);
 		match[i] = nil;
-	}
-	for(i=0; i<10 && rs[i].s.sp!=nil; i++){
-		n = rs[i].e.ep-rs[i].s.sp;
-		match[i] = emalloc(n+1);
-		memmove(match[i], rs[i].s.sp, n);
-		match[i][n] = '\0';
+		if(rs[i].s.sp != nil){
+			n = rs[i].e.ep-rs[i].s.sp;
+			match[i] = emalloc(n+1);
+			memmove(match[i], rs[i].s.sp, n);
+			match[i][n] = '\0';
+		}
 	}
 }