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Annotation of OpenXM_contrib/gmp/mpbsd/mtox.c, Revision 1.1

1.1     ! maekawa     1: /* mtox -- Convert OPERAND to hexadecimal and return a malloc'ed string
        !             2:    with the result of the conversion.
        !             3:
        !             4: Copyright (C) 1991, 1994 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include "mp.h"
        !            24: #include "gmp.h"
        !            25: #include "gmp-impl.h"
        !            26:
        !            27: char *
        !            28: #if __STDC__
        !            29: mtox (const MINT *x)
        !            30: #else
        !            31: mtox (x)
        !            32:      const MINT *x;
        !            33: #endif
        !            34: {
        !            35:   mp_ptr xp;
        !            36:   mp_size_t xsize = x->_mp_size;
        !            37:   mp_size_t xsign;
        !            38:   unsigned char *str, *s;
        !            39:   size_t str_size, i;
        !            40:   int zeros;
        !            41:   char *num_to_text;
        !            42:   TMP_DECL (marker);
        !            43:
        !            44:   if (xsize == 0)
        !            45:     {
        !            46:       str = (unsigned char *) (*_mp_allocate_func) (2);
        !            47:       str[0] = '0';
        !            48:       str[1] = 0;
        !            49:       return str;
        !            50:     }
        !            51:   xsign = xsize;
        !            52:   if (xsize < 0)
        !            53:     xsize = -xsize;
        !            54:
        !            55:   TMP_MARK (marker);
        !            56:   str_size = ((size_t) (xsize * BITS_PER_MP_LIMB
        !            57:                        * __mp_bases[16].chars_per_bit_exactly)) + 3;
        !            58:   str = (unsigned char *) (*_mp_allocate_func) (str_size);
        !            59:   s = str;
        !            60:
        !            61:   if (xsign < 0)
        !            62:     *s++ = '-';
        !            63:
        !            64:   /* Move the number to convert into temporary space, since mpn_get_str
        !            65:      clobbers its argument + needs one extra high limb....  */
        !            66:   xp = (mp_ptr) TMP_ALLOC ((xsize + 1) * BYTES_PER_MP_LIMB);
        !            67:   MPN_COPY (xp, x->_mp_d, xsize);
        !            68:
        !            69:   str_size = mpn_get_str (s, 16, xp, xsize);
        !            70:
        !            71:   /* mpn_get_str might make some leading zeros.  Skip them.  */
        !            72:   for (zeros = 0; s[zeros] == 0; zeros++)
        !            73:     str_size--;
        !            74:
        !            75:   /* Translate to printable chars and move string down.  */
        !            76:   for (i = 0; i < str_size; i++)
        !            77:     s[i] = "0123456789abcdef"[s[zeros + i]];
        !            78:   s[str_size] = 0;
        !            79:
        !            80:   return str;
        !            81: }