mtox.c
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上传日期:2022-08-06
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- /* mtox -- Convert OPERAND to hexadecimal and return a malloc'ed string
- with the result of the conversion.
- Copyright 1991, 1994, 2000, 2001, 2002 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 Lesser General Public License as published by
- the Free Software Foundation; either version 3 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 Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <string.h>
- #include "mp.h"
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "longlong.h"
- char *
- mtox (const MINT *x)
- {
- mp_size_t xsize = x->_mp_size;
- mp_ptr xp;
- mp_size_t xsign;
- unsigned char *str, *s;
- size_t str_size, alloc_size, i;
- xsign = xsize;
- if (xsize < 0)
- xsize = -xsize;
- /* digits, plus ' ', plus possible '-', for an exact size */
- xp = x->_mp_d;
- MPN_SIZEINBASE_16 (alloc_size, xp, xsize);
- alloc_size += 1 + (xsign < 0);
- str = (unsigned char *) (*__gmp_allocate_func) (alloc_size);
- s = str;
- if (xsign < 0)
- *s++ = '-';
- str_size = mpn_get_str (s, 16, xp, xsize);
- ASSERT (str_size <= alloc_size - (xsign < 0));
- ASSERT (str_size == 1 || *s != 0);
- for (i = 0; i < str_size; i++)
- s[i] = "0123456789abcdef"[s[i]];
- s[str_size] = 0;
- ASSERT (strlen (str) + 1 == alloc_size);
- return (char *) str;
- }