1 files changed, 8 insertions, 0 deletions
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++)