add_1.c

一个C源代码分析器

/* mpn_add_1 --

Copyright (C) 1993, 1994 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP 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.

The GNU MP 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 the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

#define __mpn_add_1 __noname
#include "gmp.h"
#undef __mpn_add_1

#include "gmp-impl.h"

mp_limb
__mpn_add_1 (res_ptr, s1_ptr, s1_size, s2_limb)
     register mp_ptr res_ptr;
     register mp_srcptr s1_ptr;
     register mp_size_t s1_size;
     register mp_limb s2_limb;
{
  register mp_limb x;

  x = *s1_ptr++;
  s2_limb = x + s2_limb;
  *res_ptr++ = s2_limb;
  if (s2_limb < x)
    {
      while (--s1_size != 0)
	{
	  x = *s1_ptr++ + 1;
	  *res_ptr++ = x;
	  if (x != 0)
	    goto fin;
	}

      return 1;
    }

 fin:
  if (res_ptr != s1_ptr)
    {
      mp_size_t i;
      for (i = 0; i < s1_size - 1; i++)
	res_ptr[i] = s1_ptr[i];
    }

  return 0;
}