Avoid unnecessary realloc in resizebuf.

1 files changed, 5 insertions, 4 deletions

diff --git a/pw.c b/pw.c
index acac723..6c36a90 100644
--- a/pw.c
+++ b/pw.c
@@ -1048,13 +1048,14 @@ static void sigwinch(int sig)
 
 static char **resizebuf(char **buf, size_t nlfrom, size_t nlto)
 {
-  if (nlfrom > nlto)
+  if (nlfrom > nlto) {
     for (size_t i = nlto; i < nlfrom; i++)
       dsdrop(buf[i]);
-  if ((buf = realloc(buf, sizeof *buf * nlto)) == 0)
-    panic("out of memory");
-  if (nlfrom < nlto)
+  } else if (nlfrom < nlto) {
+    if ((buf = realloc(buf, sizeof *buf * nlto)) == 0)
+      panic("out of memory");
     memset(buf + nlfrom, 0, (nlto - nlfrom) * sizeof *buf);
+  }
   return buf;
 }