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Annotation of OpenXM_contrib/gmp/mpbsd/mtox.c, Revision 1.1.1.1

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: }