Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 814 insertions, 0 deletions

diff --git a/g10/plaintext.c b/g10/plaintext.c
new file mode 100644
index 0000000..3bc8696
--- /dev/null
+++ b/g10/plaintext.c
@@ -0,0 +1,814 @@
+/* plaintext.c -  process plaintext packets
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ *               2006, 2009, 2010 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#ifdef HAVE_DOSISH_SYSTEM
+# include <fcntl.h> /* for setmode() */
+#endif
+
+#include "gpg.h"
+#include "../common/util.h"
+#include "options.h"
+#include "packet.h"
+#include "../common/ttyio.h"
+#include "filter.h"
+#include "main.h"
+#include "../common/status.h"
+#include "../common/i18n.h"
+
+
+/* Get the output filename.  On success, the actual filename that is
+   used is set in *FNAMEP and a filepointer is returned in *FP.
+
+   EMBEDDED_NAME AND EMBEDDED_NAMELEN are normally stored in a
+   plaintext packet.  EMBEDDED_NAMELEN should not include any NUL
+   terminator (EMBEDDED_NAME does not need to be NUL terminated).
+
+   DATA is the iobuf containing the input data.  We just use it to get
+   the input file's filename.
+
+   On success, the caller is responsible for calling xfree on *FNAMEP
+   and calling es_close on *FPP.  */
+gpg_error_t
+get_output_file (const byte *embedded_name, int embedded_namelen,
+                 iobuf_t data, char **fnamep, estream_t *fpp)
+{
+  gpg_error_t err = 0;
+  char *fname = NULL;
+  estream_t fp = NULL;
+  int nooutput = 0;
+
+  /* Create the filename as C string.  */
+  if (opt.outfp)
+    {
+      fname = xtrystrdup ("[FP]");
+      if (!fname)
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+    }
+  else if (opt.outfile
+           && !(opt.flags.use_embedded_filename && opt.flags.dummy_outfile))
+    {
+      fname = xtrystrdup (opt.outfile);
+      if (!fname)
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+    }
+  else if (embedded_namelen == 8 && !memcmp (embedded_name, "_CONSOLE", 8))
+    {
+      log_info (_("data not saved; use option \"--output\" to save it\n"));
+      nooutput = 1;
+    }
+  else if (!opt.flags.use_embedded_filename)
+    {
+      if (data)
+        fname = make_outfile_name (iobuf_get_real_fname (data));
+      if (!fname)
+	fname = ask_outfile_name (embedded_name, embedded_namelen);
+      if (!fname)
+	{
+	  err = gpg_error (GPG_ERR_GENERAL);	/* Can't create file. */
+	  goto leave;
+	}
+    }
+  else
+    fname = utf8_to_native (embedded_name, embedded_namelen, 0);
+
+  if (nooutput)
+    ;
+  else if (opt.outfp)
+    {
+      fp = opt.outfp;
+      es_set_binary (fp);
+    }
+  else if (iobuf_is_pipe_filename (fname) || !*fname)
+    {
+      /* Special file name, no filename, or "-" given; write to the
+       * file descriptor or to stdout. */
+      int fd;
+      char xname[64];
+
+      fd = check_special_filename (fname, 1, 0);
+      if (fd == -1)
+        {
+          /* Not a special filename, thus we want stdout.  */
+          fp = es_stdout;
+          es_set_binary (fp);
+        }
+      else if (!(fp = es_fdopen_nc (fd, "wb")))
+        {
+          err = gpg_error_from_syserror ();
+          snprintf (xname, sizeof xname, "[fd %d]", fd);
+          log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (err));
+          goto leave;
+        }
+    }
+  else
+    {
+      while (!overwrite_filep (fname))
+	{
+	  char *tmp = ask_outfile_name (NULL, 0);
+	  if (!tmp || !*tmp)
+	    {
+	      xfree (tmp);
+              /* FIXME: Below used to be GPG_ERR_CREATE_FILE */
+	      err = gpg_error (GPG_ERR_GENERAL);
+	      goto leave;
+	    }
+	  xfree (fname);
+	  fname = tmp;
+	}
+    }
+
+#ifndef __riscos__
+  if (opt.outfp && is_secured_file (es_fileno (opt.outfp)))
+    {
+      err = gpg_error (GPG_ERR_EPERM);
+      log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
+      goto leave;
+    }
+  else if (fp || nooutput)
+    ;
+  else if (is_secured_filename (fname))
+    {
+      gpg_err_set_errno (EPERM);
+      err = gpg_error_from_syserror ();
+      log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
+      goto leave;
+    }
+  else if (!(fp = es_fopen (fname, "wb")))
+    {
+      err = gpg_error_from_syserror ();
+      log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
+      goto leave;
+    }
+#else /* __riscos__ */
+  /* If no output filename was given, i.e. we constructed it, convert
+     all '.' in fname to '/' but not vice versa as we don't create
+     directories! */
+  if (!opt.outfile)
+    for (c = 0; fname[c]; ++c)
+      if (fname[c] == '.')
+	fname[c] = '/';
+
+  if (fp || nooutput)
+    ;
+  else
+    {
+      /* Note: riscos stuff is not expected to work anymore.  If we
+         want to port it again to riscos we should do most of the suff
+         in estream.  FIXME: Consider to remove all riscos special
+         cases.  */
+      fp = gnupg_fopen (fname, "wb");
+      if (!fp)
+	{
+	  log_error (_("error creating '%s': %s\n"), fname, gpg_strerror (err));
+	  err = GPG_ERR_CREATE_FILE;
+	  if (errno == 106)
+	    log_info ("Do output file and input file have the same name?\n");
+	  goto leave;
+	}
+
+      /* If there's a ,xxx extension in the embedded filename,
+         use that, else check whether the user input (in fname)
+         has a ,xxx appended, then use that in preference */
+      if ((c = riscos_get_filetype_from_string (embedded_name,
+                                                embedded_namelen)) != -1)
+	filetype = c;
+      if ((c = riscos_get_filetype_from_string (fname, strlen (fname))) != -1)
+	filetype = c;
+      riscos_set_filetype_by_number (fname, filetype);
+    }
+#endif /* __riscos__ */
+
+ leave:
+  if (err)
+    {
+      if (fp && fp != es_stdout && fp != opt.outfp)
+        es_fclose (fp);
+      xfree (fname);
+      return err;
+    }
+
+  *fnamep = fname;
+  *fpp = fp;
+  return 0;
+}
+
+/* Handle a plaintext packet.  If MFX is not NULL, update the MDs
+ * Note: We should have used the filter stuff here, but we have to add
+ * some easy mimic to set a read limit, so we calculate only the bytes
+ * from the plaintext.  */
+int
+handle_plaintext (PKT_plaintext * pt, md_filter_context_t * mfx,
+		  int nooutput, int clearsig)
+{
+  char *fname = NULL;
+  estream_t fp = NULL;
+  static off_t count = 0;
+  int err = 0;
+  int c;
+  int convert;
+#ifdef __riscos__
+  int filetype = 0xfff;
+#endif
+
+  if (pt->mode == 't' || pt->mode == 'u' || pt->mode == 'm')
+    convert = pt->mode;
+  else
+    convert = 0;
+
+  /* Let people know what the plaintext info is. This allows the
+     receiving program to try and do something different based on the
+     format code (say, recode UTF-8 to local). */
+  if (!nooutput && is_status_enabled ())
+    {
+      char status[50];
+
+      /* Better make sure that stdout has been flushed in case the
+         output will be written to it.  This is to make sure that no
+         not-yet-flushed stuff will be written after the plaintext
+         status message.  */
+      es_fflush (es_stdout);
+
+      snprintf (status, sizeof status,
+                "%X %lu ", (byte) pt->mode, (ulong) pt->timestamp);
+      write_status_text_and_buffer (STATUS_PLAINTEXT,
+				    status, pt->name, pt->namelen, 0);
+
+      if (!pt->is_partial)
+	{
+	  snprintf (status, sizeof status, "%lu", (ulong) pt->len);
+	  write_status_text (STATUS_PLAINTEXT_LENGTH, status);
+	}
+    }
+
+  if (! nooutput)
+    {
+      err = get_output_file (pt->name, pt->namelen, pt->buf, &fname, &fp);
+      if (err)
+        goto leave;
+    }
+
+  if (!pt->is_partial)
+    {
+      /* We have an actual length (which might be zero). */
+
+      if (clearsig)
+	{
+	  log_error ("clearsig encountered while not expected\n");
+	  err = gpg_error (GPG_ERR_UNEXPECTED);
+	  goto leave;
+	}
+
+      if (convert) /* Text mode.  */
+	{
+	  for (; pt->len; pt->len--)
+	    {
+	      if ((c = iobuf_get (pt->buf)) == -1)
+		{
+		  err = gpg_error_from_syserror ();
+		  log_error ("problem reading source (%u bytes remaining)\n",
+			     (unsigned) pt->len);
+		  goto leave;
+		}
+	      if (mfx->md)
+		gcry_md_putc (mfx->md, c);
+#ifndef HAVE_DOSISH_SYSTEM
+              /* Convert to native line ending. */
+              /* fixme: this hack might be too simple */
+	      if (c == '\r' && convert != 'm')
+		continue;
+#endif
+	      if (fp)
+		{
+		  if (opt.max_output && (++count) > opt.max_output)
+		    {
+		      log_error ("error writing to '%s': %s\n",
+				 fname, "exceeded --max-output limit\n");
+		      err = gpg_error (GPG_ERR_TOO_LARGE);
+		      goto leave;
+		    }
+		  else if (es_putc (c, fp) == EOF)
+		    {
+		      if (es_ferror (fp))
+			err = gpg_error_from_syserror ();
+		      else
+			err = gpg_error (GPG_ERR_EOF);
+		      log_error ("error writing to '%s': %s\n",
+				 fname, gpg_strerror (err));
+		      goto leave;
+		    }
+		}
+	    }
+	}
+      else  /* Binary mode.  */
+	{
+	  byte *buffer = xmalloc (32768);
+	  while (pt->len)
+	    {
+	      int len = pt->len > 32768 ? 32768 : pt->len;
+	      len = iobuf_read (pt->buf, buffer, len);
+	      if (len == -1)
+		{
+		  err = gpg_error_from_syserror ();
+		  log_error ("problem reading source (%u bytes remaining)\n",
+			     (unsigned) pt->len);
+		  xfree (buffer);
+		  goto leave;
+		}
+	      if (mfx->md)
+		gcry_md_write (mfx->md, buffer, len);
+	      if (fp)
+		{
+		  if (opt.max_output && (count += len) > opt.max_output)
+		    {
+		      log_error ("error writing to '%s': %s\n",
+				 fname, "exceeded --max-output limit\n");
+		      err = gpg_error (GPG_ERR_TOO_LARGE);
+		      xfree (buffer);
+		      goto leave;
+		    }
+		  else if (es_fwrite (buffer, 1, len, fp) != len)
+		    {
+		      err = gpg_error_from_syserror ();
+		      log_error ("error writing to '%s': %s\n",
+				 fname, gpg_strerror (err));
+		      xfree (buffer);
+		      goto leave;
+		    }
+		}
+	      pt->len -= len;
+	    }
+	  xfree (buffer);
+	}
+    }
+  else if (!clearsig)
+    {
+      if (convert)
+	{			/* text mode */
+	  while ((c = iobuf_get (pt->buf)) != -1)
+	    {
+	      if (mfx->md)
+		gcry_md_putc (mfx->md, c);
+#ifndef HAVE_DOSISH_SYSTEM
+	      if (c == '\r' && convert != 'm')
+		continue;	/* fixme: this hack might be too simple */
+#endif
+	      if (fp)
+		{
+		  if (opt.max_output && (++count) > opt.max_output)
+		    {
+		      log_error ("Error writing to '%s': %s\n",
+				 fname, "exceeded --max-output limit\n");
+		      err = gpg_error (GPG_ERR_TOO_LARGE);
+		      goto leave;
+		    }
+		  else if (es_putc (c, fp) == EOF)
+		    {
+		      if (es_ferror (fp))
+			err = gpg_error_from_syserror ();
+		      else
+			err = gpg_error (GPG_ERR_EOF);
+		      log_error ("error writing to '%s': %s\n",
+				 fname, gpg_strerror (err));
+		      goto leave;
+		    }
+		}
+	    }
+	}
+      else
+	{			/* binary mode */
+	  byte *buffer;
+	  int eof_seen = 0;
+
+          buffer = xtrymalloc (32768);
+          if (!buffer)
+            {
+              err = gpg_error_from_syserror ();
+              goto leave;
+            }
+
+	  while (!eof_seen)
+	    {
+	      /* Why do we check for len < 32768:
+	       * If we won't, we would practically read 2 EOFs but
+	       * the first one has already popped the block_filter
+	       * off and therefore we don't catch the boundary.
+	       * So, always assume EOF if iobuf_read returns less bytes
+	       * then requested */
+	      int len = iobuf_read (pt->buf, buffer, 32768);
+	      if (len == -1)
+		break;
+	      if (len < 32768)
+		eof_seen = 1;
+	      if (mfx->md)
+		gcry_md_write (mfx->md, buffer, len);
+	      if (fp)
+		{
+		  if (opt.max_output && (count += len) > opt.max_output)
+		    {
+		      log_error ("error writing to '%s': %s\n",
+				 fname, "exceeded --max-output limit\n");
+		      err = gpg_error (GPG_ERR_TOO_LARGE);
+		      xfree (buffer);
+		      goto leave;
+		    }
+		  else if (es_fwrite (buffer, 1, len, fp) != len)
+		    {
+		      err = gpg_error_from_syserror ();
+		      log_error ("error writing to '%s': %s\n",
+				 fname, gpg_strerror (err));
+		      xfree (buffer);
+		      goto leave;
+		    }
+		}
+	    }
+	  xfree (buffer);
+	}
+      pt->buf = NULL;
+    }
+  else /* Clear text signature - don't hash the last CR,LF.   */
+    {
+      int state = 0;
+
+      while ((c = iobuf_get (pt->buf)) != -1)
+	{
+	  if (fp)
+	    {
+	      if (opt.max_output && (++count) > opt.max_output)
+		{
+		  log_error ("error writing to '%s': %s\n",
+			     fname, "exceeded --max-output limit\n");
+		  err = gpg_error (GPG_ERR_TOO_LARGE);
+		  goto leave;
+		}
+	      else if (es_putc (c, fp) == EOF)
+		{
+		  err = gpg_error_from_syserror ();
+		  log_error ("error writing to '%s': %s\n",
+			     fname, gpg_strerror (err));
+		  goto leave;
+		}
+	    }
+	  if (!mfx->md)
+	    continue;
+	  if (state == 2)
+	    {
+	      gcry_md_putc (mfx->md, '\r');
+	      gcry_md_putc (mfx->md, '\n');
+	      state = 0;
+	    }
+	  if (!state)
+	    {
+	      if (c == '\r')
+		state = 1;
+	      else if (c == '\n')
+		state = 2;
+	      else
+		gcry_md_putc (mfx->md, c);
+	    }
+	  else if (state == 1)
+	    {
+	      if (c == '\n')
+		state = 2;
+	      else
+		{
+		  gcry_md_putc (mfx->md, '\r');
+		  if (c == '\r')
+		    state = 1;
+		  else
+		    {
+		      state = 0;
+		      gcry_md_putc (mfx->md, c);
+		    }
+		}
+	    }
+	}
+      pt->buf = NULL;
+    }
+
+  if (fp && fp != es_stdout && fp != opt.outfp && es_fclose (fp))
+    {
+      err = gpg_error_from_syserror ();
+      log_error ("error closing '%s': %s\n", fname, gpg_strerror (err));
+      fp = NULL;
+      goto leave;
+    }
+  fp = NULL;
+
+ leave:
+  /* Make sure that stdout gets flushed after the plaintext has been
+     handled.  This is for extra security as we do a flush anyway
+     before checking the signature.  */
+  if (es_fflush (es_stdout))
+    {
+      /* We need to check the return code to detect errors like disk
+         full for short plaintexts.  See bug#1207.  Checking return
+         values is a good idea in any case.  */
+      if (!err)
+        err = gpg_error_from_syserror ();
+      log_error ("error flushing '%s': %s\n", "[stdout]",
+                 gpg_strerror (err));
+    }
+
+  if (fp && fp != es_stdout && fp != opt.outfp)
+    es_fclose (fp);
+  xfree (fname);
+  return err;
+}
+
+
+static void
+do_hash (gcry_md_hd_t md, gcry_md_hd_t md2, IOBUF fp, int textmode)
+{
+  text_filter_context_t tfx;
+  int c;
+
+  if (textmode)
+    {
+      memset (&tfx, 0, sizeof tfx);
+      iobuf_push_filter (fp, text_filter, &tfx);
+    }
+  if (md2)
+    {				/* work around a strange behaviour in pgp2 */
+      /* It seems that at least PGP5 converts a single CR to a CR,LF too */
+      int lc = -1;
+      while ((c = iobuf_get (fp)) != -1)
+	{
+	  if (c == '\n' && lc == '\r')
+	    gcry_md_putc (md2, c);
+	  else if (c == '\n')
+	    {
+	      gcry_md_putc (md2, '\r');
+	      gcry_md_putc (md2, c);
+	    }
+	  else if (c != '\n' && lc == '\r')
+	    {
+	      gcry_md_putc (md2, '\n');
+	      gcry_md_putc (md2, c);
+	    }
+	  else
+	    gcry_md_putc (md2, c);
+
+	  if (md)
+	    gcry_md_putc (md, c);
+	  lc = c;
+	}
+    }
+  else
+    {
+      while ((c = iobuf_get (fp)) != -1)
+	{
+	  if (md)
+	    gcry_md_putc (md, c);
+	}
+    }
+}
+
+
+/****************
+ * Ask for the detached datafile and calculate the digest from it.
+ * INFILE is the name of the input file.
+ */
+int
+ask_for_detached_datafile (gcry_md_hd_t md, gcry_md_hd_t md2,
+			   const char *inname, int textmode)
+{
+  progress_filter_context_t *pfx;
+  char *answer = NULL;
+  IOBUF fp;
+  int rc = 0;
+
+  pfx = new_progress_context ();
+  fp = open_sigfile (inname, pfx);	/* Open default file. */
+
+  if (!fp && !opt.batch)
+    {
+      int any = 0;
+      tty_printf (_("Detached signature.\n"));
+      do
+	{
+	  char *name;
+
+	  xfree (answer);
+	  tty_enable_completion (NULL);
+	  name = cpr_get ("detached_signature.filename",
+			  _("Please enter name of data file: "));
+	  tty_disable_completion ();
+	  cpr_kill_prompt ();
+	  answer = make_filename (name, (void *) NULL);
+	  xfree (name);
+
+	  if (any && !*answer)
+	    {
+	      rc = gpg_error (GPG_ERR_GENERAL);	/*G10ERR_READ_FILE */
+	      goto leave;
+	    }
+	  fp = iobuf_open (answer);
+	  if (fp && is_secured_file (iobuf_get_fd (fp)))
+	    {
+	      iobuf_close (fp);
+	      fp = NULL;
+	      gpg_err_set_errno (EPERM);
+	    }
+	  if (!fp && errno == ENOENT)
+	    {
+	      tty_printf ("No such file, try again or hit enter to quit.\n");
+	      any++;
+	    }
+	  else if (!fp)
+	    {
+	      rc = gpg_error_from_syserror ();
+	      log_error (_("can't open '%s': %s\n"), answer,
+			 strerror (errno));
+	      goto leave;
+	    }
+	}
+      while (!fp);
+    }
+
+  if (!fp)
+    {
+      if (opt.verbose)
+	log_info (_("reading stdin ...\n"));
+      fp = iobuf_open (NULL);
+      log_assert (fp);
+    }
+  do_hash (md, md2, fp, textmode);
+  iobuf_close (fp);
+
+leave:
+  xfree (answer);
+  release_progress_context (pfx);
+  return rc;
+}
+
+
+
+/* Hash the given files and append the hash to hash contexts MD and
+ * MD2.  If FILES is NULL, stdin is hashed.  */
+int
+hash_datafiles (gcry_md_hd_t md, gcry_md_hd_t md2, strlist_t files,
+		const char *sigfilename, int textmode)
+{
+  progress_filter_context_t *pfx;
+  IOBUF fp;
+  strlist_t sl;
+
+  pfx = new_progress_context ();
+
+  if (!files)
+    {
+      /* Check whether we can open the signed material.  We avoid
+         trying to open a file if run in batch mode.  This assumed
+         data file for a sig file feature is just a convenience thing
+         for the command line and the user needs to read possible
+         warning messages. */
+      if (!opt.batch)
+        {
+          fp = open_sigfile (sigfilename, pfx);
+          if (fp)
+            {
+              do_hash (md, md2, fp, textmode);
+              iobuf_close (fp);
+              release_progress_context (pfx);
+              return 0;
+            }
+        }
+      log_error (_("no signed data\n"));
+      release_progress_context (pfx);
+      return gpg_error (GPG_ERR_NO_DATA);
+    }
+
+
+  for (sl = files; sl; sl = sl->next)
+    {
+      fp = iobuf_open (sl->d);
+      if (fp && is_secured_file (iobuf_get_fd (fp)))
+	{
+	  iobuf_close (fp);
+	  fp = NULL;
+	  gpg_err_set_errno (EPERM);
+	}
+      if (!fp)
+	{
+	  int rc = gpg_error_from_syserror ();
+	  log_error (_("can't open signed data '%s'\n"),
+		     print_fname_stdin (sl->d));
+	  release_progress_context (pfx);
+	  return rc;
+	}
+      handle_progress (pfx, fp, sl->d);
+      do_hash (md, md2, fp, textmode);
+      iobuf_close (fp);
+    }
+
+  release_progress_context (pfx);
+  return 0;
+}
+
+
+/* Hash the data from file descriptor DATA_FD and append the hash to hash
+   contexts MD and MD2.  */
+int
+hash_datafile_by_fd (gcry_md_hd_t md, gcry_md_hd_t md2, int data_fd,
+		     int textmode)
+{
+  progress_filter_context_t *pfx = new_progress_context ();
+  iobuf_t fp;
+
+  if (is_secured_file (data_fd))
+    {
+      fp = NULL;
+      gpg_err_set_errno (EPERM);
+    }
+  else
+    fp = iobuf_fdopen_nc (data_fd, "rb");
+
+  if (!fp)
+    {
+      int rc = gpg_error_from_syserror ();
+      log_error (_("can't open signed data fd=%d: %s\n"),
+		 data_fd, strerror (errno));
+      release_progress_context (pfx);
+      return rc;
+    }
+
+  handle_progress (pfx, fp, NULL);
+
+  do_hash (md, md2, fp, textmode);
+
+  iobuf_close (fp);
+
+  release_progress_context (pfx);
+  return 0;
+}
+
+
+/* Set up a plaintext packet with the appropriate filename.  If there
+   is a --set-filename, use it (it's already UTF8).  If there is a
+   regular filename, UTF8-ize it if necessary.  If there is no
+   filenames at all, set the field empty. */
+
+PKT_plaintext *
+setup_plaintext_name (const char *filename, IOBUF iobuf)
+{
+  PKT_plaintext *pt;
+
+  if ((filename && !iobuf_is_pipe_filename (filename))
+       || (opt.set_filename && !iobuf_is_pipe_filename (opt.set_filename)))
+    {
+      char *s;
+
+      if (opt.set_filename)
+	s = make_basename (opt.set_filename, iobuf_get_real_fname (iobuf));
+      else if (filename && !opt.flags.utf8_filename)
+	{
+	  char *tmp = native_to_utf8 (filename);
+	  s = make_basename (tmp, iobuf_get_real_fname (iobuf));
+	  xfree (tmp);
+	}
+      else
+	s = make_basename (filename, iobuf_get_real_fname (iobuf));
+
+      pt = xmalloc (sizeof *pt + strlen (s) - 1);
+      pt->namelen = strlen (s);
+      memcpy (pt->name, s, pt->namelen);
+      xfree (s);
+    }
+  else
+    {
+      /* no filename */
+      pt = xmalloc (sizeof *pt - 1);
+      pt->namelen = 0;
+    }
+
+  return pt;
+}