/* make-suffix.c: unconditionally add a filename suffix.

Copyright (C) 1992, 93, 95 Free Software Foundation, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <kpathsea/config.h>
#include <kpathsea/c-pathch.h>

/* Return a new string: S suffixed with SUFFIX, regardless of what it
   was before. This returns a newly allocated string.  */ 

string
make_suffix P2C(const_string, s,  const_string, suffix)
{
  string new_s;
  const_string dot_pos = strrchr (s, '.');
  const_string slash_pos;
  
  for (slash_pos = s + strlen (s) - 1; slash_pos > dot_pos && slash_pos > s;
       slash_pos--) {
    if (IS_DIR_SEP (*slash_pos))
      break;
  }

  if (dot_pos == NULL || slash_pos > dot_pos )
    new_s = concat3 (s, ".", suffix);
  else
    {
      unsigned past_dot_index = dot_pos + 1 - s;
      
      new_s = xmalloc (past_dot_index + strlen (suffix) + 1);
      strncpy (new_s, s, dot_pos + 1 - s);
      strcpy (new_s + past_dot_index, suffix);
    }

  return new_s;
}