/* $Id: bnamecmp.c,v 1.5 2008/10/28 22:00:17 kiesling Exp $ -*-c-*-*/

/*
  This file is part of ctalk.
  Copyright © 2005-2008  Robert Kiesling, ctalk@ctalklang.org.
  Permission is granted to copy this software provided that this copyright
  notice is included in all source code modules.

  This library 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 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software Foundation, 
  Inc., 51 Franklin St., Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <string.h>
#include <ctype.h>

/* Prototype for lib/substrcpy.c. */
char *substrcpy (char *, char *, int, int);

#ifndef MAXLABEL
#define MAXLABEL 255
#endif

#if defined(__GNUC__) && defined(__sparc__) && defined(__svr4__)
#define index strchr
#endif
/*
 * TO DO -
 * 1. This needs to be speeded up.
 *
 * 2. Compare only the first 63 characters, as specified in C99.
 */

/*
 * Match s1 and s2 up to the parameter list - the first '('.
 *
 * Return < 0 if s1 < s2, 0 if s1 == s2, > 0 if s1 > s2. 
 */

int basename_cmp (const char *s1, const char *s2) {

  char *p_1, *p_2;        /* Start of arguments.  */
  char b1[MAXLABEL], b2[MAXLABEL];    /* Basenames.           */

  p_1 = index (s1, '(');
  p_2 = index (s2, '(');
  if (p_1) { while (isspace((int)*p_1)) --p_1; } 
  if (p_2) { while (isspace((int)*p_2)) --p_2; } 

  if ((p_1 && p_2) &&
      ((p_1 - s1) != (p_2 - s2)))
    return -1;

  /* Substrcpy takes care of trailing nulls, strncpy doesn't. */
  if (p_1)
    substrcpy (b1, (char *)s1, 0, p_1 - s1);
  if (p_2)
    substrcpy (b2, (char *)s2, 0, p_2 - s2);

  return strcmp (((p_1) ? b1 : s1), ((p_2) ? b2 : s2));
}

