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Annotation of OpenXM_contrib/gmp/mpq/cmp_si.c, Revision 1.1.1.1

1.1       ohara       1: /* _mpq_cmp_si -- compare mpq and long/ulong fraction.
                      2:
                      3: Copyright 2001 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Lesser General Public License
                     18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24:
                     25:
                     26: /* Something like mpq_cmpabs_ui would be more useful for the neg/neg case,
                     27:    and perhaps a version accepting a parameter to reverse the test, to make
                     28:    it a tail call here.  */
                     29:
                     30: int
                     31: _mpq_cmp_si (mpq_srcptr q, long n, unsigned long d)
                     32: {
                     33:   /* need canonical sign to get right result */
                     34:   ASSERT (q->_mp_den._mp_size > 0);
                     35:
                     36:   if (q->_mp_num._mp_size >= 0)
                     37:     {
                     38:       if (n >= 0)
                     39:         return _mpq_cmp_ui (q, n, d);            /* >=0 cmp >=0 */
                     40:       else
                     41:         return 1;                                /* >=0 cmp <0 */
                     42:     }
                     43:   else
                     44:     {
                     45:       if (n >= 0)
                     46:         return -1;                               /* <0 cmp >=0 */
                     47:       else
                     48:         {
                     49:           mpq_t  qabs;
                     50:           qabs->_mp_num._mp_size = ABS (q->_mp_num._mp_size);
                     51:           qabs->_mp_num._mp_d    = q->_mp_num._mp_d;
                     52:           qabs->_mp_den._mp_size = q->_mp_den._mp_size;
                     53:           qabs->_mp_den._mp_d    = q->_mp_den._mp_d;
                     54:
                     55:           return - _mpq_cmp_ui (qabs, -n, d);    /* <0 cmp <0 */
                     56:         }
                     57:     }
                     58: }