Optimize string concatenation.

1 files changed, 5 insertions, 4 deletions

diff --git a/run.c b/run.c
index b05eb7c..f5bcdc5 100644
--- a/run.c
+++ b/run.c
@@ -1196,13 +1196,14 @@ Cell *cat(Node **a, int q)	/* a[0] cat a[1] */
 
 	x = execute(a[0]);
 	n1 = strlen(getsval(x));
-	adjbuf(&s, &ssz, n1 + 1, recsize, 0, "cat1");
-	(void) strncpy(s, x->sval, ssz);
 
 	y = execute(a[1]);
 	n2 = strlen(getsval(y));
-	adjbuf(&s, &ssz, n1 + n2 + 1, recsize, 0, "cat2");
-	(void) strncpy(s + n1, y->sval, ssz - n1);
+
+	adjbuf(&s, &ssz, n1 + n2 + 1, recsize, 0, "cat");
+	memcpy(s, x->sval, n1);
+	memcpy(s + n1, y->sval, n2);
+	s[n1 + n2] = '\0';
 
 	tempfree(x);
 	tempfree(y);