aa9bc17601
BMakefiles and other bits will follow. Requested by: Andrey Chernov Made world by: Chuck Robey
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* mpz_get_str (string, base, mp_src) -- Convert the multiple precision
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number MP_SRC to a string STRING of base BASE. If STRING is NULL
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allocate space for the result. In any case, return a pointer to the
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result. If STRING is not NULL, the caller must ensure enough space is
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available to store the result.
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Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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#include "gmp-impl.h"
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char *
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#if __STDC__
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mpz_get_str (char *res_str, int base, mpz_srcptr x)
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#else
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mpz_get_str (res_str, base, x)
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char *res_str;
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int base;
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mpz_srcptr x;
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#endif
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{
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mp_ptr xp;
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mp_size_t x_size = x->_mp_size;
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unsigned char *str;
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char *return_str;
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size_t str_size;
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char *num_to_text;
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int i;
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TMP_DECL (marker);
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TMP_MARK (marker);
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if (base >= 0)
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{
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if (base == 0)
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base = 10;
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num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
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}
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else
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{
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base = -base;
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num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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}
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/* We allways allocate space for the string. If the caller passed a
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NULL pointer for RES_STR, we allocate permanent space and return
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a pointer to that to the caller. */
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str_size = ((size_t) (ABS (x_size) * BITS_PER_MP_LIMB
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* __mp_bases[base].chars_per_bit_exactly)) + 3;
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if (res_str == 0)
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{
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/* We didn't get a string from the user. Allocate one (and return
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a pointer to it). */
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res_str = (char *) (*_mp_allocate_func) (str_size);
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/* Make str, the variable used for raw result from mpn_get_str,
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point to the same string, but just after a possible minus sign. */
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str = (unsigned char *) res_str + 1;
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}
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else
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{
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/* Use TMP_ALLOC to get temporary space, since we need a few extra bytes
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that we can't expect to caller to supply us with. */
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str = (unsigned char *) TMP_ALLOC (str_size);
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}
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return_str = res_str;
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if (x_size == 0)
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{
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res_str[0] = '0';
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res_str[1] = 0;
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TMP_FREE (marker);
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return res_str;
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}
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if (x_size < 0)
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{
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*res_str++ = '-';
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x_size = -x_size;
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}
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/* Move the number to convert into temporary space, since mpn_get_str
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clobbers its argument + needs one extra high limb.... */
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xp = (mp_ptr) TMP_ALLOC ((x_size + 1) * BYTES_PER_MP_LIMB);
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MPN_COPY (xp, x->_mp_d, x_size);
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str_size = mpn_get_str (str, base, xp, x_size);
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/* mpn_get_str might make some leading zeros. Skip them. */
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while (*str == 0)
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{
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str_size--;
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str++;
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}
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/* Translate result to printable chars and move result to RES_STR. */
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for (i = 0; i < str_size; i++)
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res_str[i] = num_to_text[str[i]];
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res_str[str_size] = 0;
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TMP_FREE (marker);
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return return_str;
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}
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