118 lines
3.4 KiB
C
118 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 1991, 1993, 1994, 1996, 2000, 2001, 2002, 2005 Free Software
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser 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., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <string.h> /* for strlen */
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "longlong.h"
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char *
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mpz_get_str (char *res_str, int base, mpz_srcptr x)
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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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char *str;
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char *return_str;
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size_t str_size;
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size_t alloc_size = 0;
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char *num_to_text;
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int i;
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TMP_DECL;
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if (base >= 0)
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{
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num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
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if (base == 0)
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base = 10;
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else if (base > 36)
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{
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num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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if (base > 62)
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return NULL;
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}
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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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/* allocate string for the user if necessary */
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if (res_str == NULL)
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{
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/* digits, null terminator, possible minus sign */
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MPN_SIZEINBASE (alloc_size, PTR(x), ABS(x_size), base);
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alloc_size += 1 + (x_size<0);
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res_str = (char *) (*__gmp_allocate_func) (alloc_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++ = '-';
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x_size = -x_size;
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}
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/* mpn_get_str clobbers its input on non power-of-2 bases */
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TMP_MARK;
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xp = x->_mp_d;
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if (! POW2_P (base))
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{
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xp = TMP_ALLOC_LIMBS (x_size + 1); /* +1 in case x_size==0 */
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MPN_COPY (xp, x->_mp_d, x_size);
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}
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str_size = mpn_get_str ((unsigned char *) res_str, base, xp, x_size);
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ASSERT (alloc_size == 0 || str_size <= alloc_size - (SIZ(x) < 0));
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/* might have a leading zero, skip it */
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str = res_str;
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if (*res_str == 0 && str_size != 1)
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{
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str_size--;
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str++;
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ASSERT (*str != 0); /* at most one leading zero */
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}
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/* Convert result to printable chars, and move down if there was a leading
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zero. */
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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;
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/* if allocated then resize down to the actual space required */
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if (alloc_size != 0)
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{
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size_t actual_size = str_size + 1 + (res_str - return_str);
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ASSERT (actual_size == strlen (return_str) + 1);
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__GMP_REALLOCATE_FUNC_MAYBE_TYPE (return_str, alloc_size, actual_size,
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char);
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}
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return return_str;
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}
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