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strvcmp.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>
#include <ctype.h>

/*
 * version strcmp(3)
 */

int
strvcmp(register const char* a, register const char* b)
{
      register unsigned long  na;
      register unsigned long  nb;

      for (;;)
      {
            if (isdigit(*a) && isdigit(*b))
            {
                  na = nb = 0;
                  while (isdigit(*a))
                        na = na * 10 + *a++ - '0';
                  while (isdigit(*b))
                        nb = nb * 10 + *b++ - '0';
                  if (na < nb)
                        return -1;
                  if (na > nb)
                        return 1;
            }
            else if (*a != *b)
                  break;
            else if (!*a)
                  return 0;
            else
            {
                  a++;
                  b++;
            }
      }
      if (*a == 0)
            return -1;
      if (*b == 0)
            return 1;
      if (*a == '.')
            return -1;
      if (*b == '.')
            return 1;
      if (*a == '-')
            return -1;
      if (*b == '-')
            return 1;
      return *a < *b ? -1 : 1;
}

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