From owner-freebsd-current@freebsd.org  Thu Jun 16 19:20:26 2016
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 for freebsd-current@freebsd.org; Thu, 16 Jun 2016 22:20:14 +0300
To: freebsd-current@freebsd.org
From: rihad <rihad@mail.ru>
Subject: dpv(1) ignores -i & -I flags
Message-ID: <99aa9e97-8bdb-cd7e-ea3a-fcdb05ee86da@mail.ru>
Date: Thu, 16 Jun 2016 23:20:04 +0400
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By simply overwriting the provided template strings with the default 
ones a bit later.

Here's one possible fix (untested):

--- dpv.c.orig    2016-06-16 23:14:00.466195000 +0400
+++ dpv.c    2016-06-16 23:15:39.306944000 +0400
@@ -455,12 +455,16 @@

      /* Set status formats and action */
      if (line_mode) {
-        config->status_solo = LINE_STATUS_SOLO;
-        config->status_many = LINE_STATUS_SOLO;
+        if (!config->status_solo)
+            config->status_solo = LINE_STATUS_SOLO;
+        if (!config->status_many)
+            config->status_many = LINE_STATUS_SOLO;
          config->action = operate_on_lines;
      } else {
-        config->status_solo = BYTE_STATUS_SOLO;
-        config->status_many = BYTE_STATUS_SOLO;
+        if (!config->status_solo)
+            config->status_solo = BYTE_STATUS_SOLO;
+        if (!config->status_many)
+            config->status_many = BYTE_STATUS_SOLO;
          config->action = operate_on_bytes;
      }