From f26560794e5f0868c9a5035158b69f3c4af8f7b3 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Fri, 6 May 2022 08:04:23 -0700
Subject: Removal of dubious addch(line, 0) caused crash.

It was a hack to make sure an object is allocated for a null line.
---
 pw.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'pw.c')

diff --git a/pw.c b/pw.c
index 3bd77fe..f44ce2a 100644
--- a/pw.c
+++ b/pw.c
@@ -193,6 +193,13 @@ static char *dsgrow(char *str, size_t len)
   return ds->str;
 }
 
+static char *dsensure(char *str)
+{
+  if (str)
+    return str;
+  return dsgrow(0, 0);
+}
+
 static char *dsdup(char *str)
 {
   size_t len = strlen(str);
@@ -995,6 +1002,7 @@ int main(int argc, char **argv)
         clearerr(stdin);
       } else if (ch == '\n') {
         nfds = 1;
+        line = dsensure(line);
         if ((pw.stat & stat_grep)) {
           int i;
           for (i = 0; i < ngrep; i++)
-- 
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