/* Log file output.
   Copyright (C) 2003, 2005, 2009, 2015-2016 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.

   This program 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* Handle multi-threaded applications.  */
#ifdef _LIBC
# include <bits/libc-lock.h>
#else
# include "lock.h"
#endif

/* Separator between msgctxt and msgid in .mo files.  */
#define MSGCTXT_SEPARATOR '\004'  /* EOT */

/* Print an ASCII string with quotes and escape sequences where needed.  */
static void
print_escaped (FILE *stream, const char *str, const char *str_end)
{
  putc ('"', stream);
  for (; str != str_end; str++)
    if (*str == '\n')
      {
        fputs ("\\n\"", stream);
        if (str + 1 == str_end)
          return;
        fputs ("\n\"", stream);
      }
    else
      {
        if (*str == '"' || *str == '\\')
          putc ('\\', stream);
        putc (*str, stream);
      }
  putc ('"', stream);
}

static char *last_logfilename = NULL;
static FILE *last_logfile = NULL;
__libc_lock_define_initialized (static, lock)

static inline void
_nl_log_untranslated_locked (const char *logfilename, const char *domainname,
                             const char *msgid1, const char *msgid2, int plural)
{
  FILE *logfile;
  const char *separator;

  /* Can we reuse the last opened logfile?  */
  if (last_logfilename == NULL || strcmp (logfilename, last_logfilename) != 0)
    {
      /* Close the last used logfile.  */
      if (last_logfilename != NULL)
        {
          if (last_logfile != NULL)
            {
              fclose (last_logfile);
              last_logfile = NULL;
            }
          free (last_logfilename);
          last_logfilename = NULL;
        }
      /* Open the logfile.  */
      last_logfilename = (char *) malloc (strlen (logfilename) + 1);
      if (last_logfilename == NULL)
        return;
      strcpy (last_logfilename, logfilename);
      last_logfile = fopen (logfilename, "a");
      if (last_logfile == NULL)
        return;
    }
  logfile = last_logfile;

  fprintf (logfile, "domain ");
  print_escaped (logfile, domainname, domainname + strlen (domainname));
  separator = strchr (msgid1, MSGCTXT_SEPARATOR);
  if (separator != NULL)
    {
      /* The part before the MSGCTXT_SEPARATOR is the msgctxt.  */
      fprintf (logfile, "\nmsgctxt ");
      print_escaped (logfile, msgid1, separator);
      msgid1 = separator + 1;
    }
  fprintf (logfile, "\nmsgid ");
  print_escaped (logfile, msgid1, msgid1 + strlen (msgid1));
  if (plural)
    {
      fprintf (logfile, "\nmsgid_plural ");
      print_escaped (logfile, msgid2, msgid2 + strlen (msgid2));
      fprintf (logfile, "\nmsgstr[0] \"\"\n");
    }
  else
    fprintf (logfile, "\nmsgstr \"\"\n");
  putc ('\n', logfile);
}

/* Add to the log file an entry denoting a failed translation.  */
void
_nl_log_untranslated (const char *logfilename, const char *domainname,
                      const char *msgid1, const char *msgid2, int plural)
{
  __libc_lock_lock (lock);
  _nl_log_untranslated_locked (logfilename, domainname, msgid1, msgid2, plural);
  __libc_lock_unlock (lock);
}