# make-suffix.c: unconditionally add a filename suffix.
#
# Copyright (C) 1992, 1993, 1995, 2011 Free Software Foundation, Inc.
#
# This program 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.
#
# 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 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 <http://www.gnu.org/licenses/>.
#


#include "config.h"
#include "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;
}