out_str.c
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上传日期:2022-08-06
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文件大小:3k
- /* mpz_out_str(stream, base, integer) -- Output to STREAM the multi prec.
- integer INTEGER in base BASE.
- Copyright 1991, 1993, 1994, 1996, 2001, 2005 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 <stdio.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- size_t
- mpz_out_str (FILE *stream, int base, mpz_srcptr x)
- {
- mp_ptr xp;
- mp_size_t x_size = x->_mp_size;
- unsigned char *str;
- size_t str_size;
- size_t i;
- size_t written;
- char *num_to_text;
- TMP_DECL;
- if (stream == 0)
- stream = stdout;
- if (base >= 0)
- {
- num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
- if (base == 0)
- base = 10;
- else if (base > 36)
- {
- num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
- if (base > 62)
- return 0;
- }
- }
- else
- {
- base = -base;
- num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
- }
- if (x_size == 0)
- {
- fputc ('0', stream);
- return ferror (stream) ? 0 : 1;
- }
- written = 0;
- if (x_size < 0)
- {
- fputc ('-', stream);
- x_size = -x_size;
- written = 1;
- }
- TMP_MARK;
- str_size = ((size_t) (x_size * GMP_LIMB_BITS
- * mp_bases[base].chars_per_bit_exactly)) + 3;
- str = (unsigned char *) TMP_ALLOC (str_size);
- /* Move the number to convert into temporary space, since mpn_get_str
- clobbers its argument + needs one extra high limb.... */
- xp = TMP_ALLOC_LIMBS (x_size + 1);
- MPN_COPY (xp, x->_mp_d, x_size);
- str_size = mpn_get_str (str, base, xp, x_size);
- /* mpn_get_str might make some leading zeros. Skip them. */
- while (*str == 0)
- {
- str_size--;
- str++;
- }
- /* Translate to printable chars. */
- for (i = 0; i < str_size; i++)
- str[i] = num_to_text[str[i]];
- str[str_size] = 0;
- {
- size_t fwret;
- fwret = fwrite ((char *) str, 1, str_size, stream);
- written += fwret;
- }
- TMP_FREE;
- return ferror (stream) ? 0 : written;
- }