108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
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/* mpz_out_str(stream, base, integer) -- Output to STREAM the multi prec.
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integer INTEGER in base BASE.
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Copyright 1991, 1993, 1994, 1996, 2001, 2005 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 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 <stdio.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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size_t
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mpz_out_str (FILE *stream, 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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unsigned char *str;
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size_t str_size;
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size_t i;
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size_t written;
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char *num_to_text;
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TMP_DECL;
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if (stream == 0)
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stream = stdout;
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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 0;
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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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if (x_size == 0)
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{
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fputc ('0', stream);
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return ferror (stream) ? 0 : 1;
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}
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written = 0;
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if (x_size < 0)
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{
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fputc ('-', stream);
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x_size = -x_size;
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written = 1;
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}
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TMP_MARK;
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str_size = ((size_t) (x_size * BITS_PER_MP_LIMB
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* __mp_bases[base].chars_per_bit_exactly)) + 3;
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str = (unsigned char *) TMP_ALLOC (str_size);
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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 to printable chars. */
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for (i = 0; i < str_size; i++)
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str[i] = num_to_text[str[i]];
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str[str_size] = 0;
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{
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size_t fwret;
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fwret = fwrite ((char *) str, 1, str_size, stream);
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written += fwret;
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}
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TMP_FREE;
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return ferror (stream) ? 0 : written;
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}
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