1  /* mpz_out_str(stream, base, integer) -- Output to STREAM the multi prec.
       2     integer INTEGER in base BASE.
       3  
       4  Copyright 1991, 1993, 1994, 1996, 2001, 2005, 2011, 2012, 2017 Free
       5  Software Foundation, Inc.
       6  
       7  This file is part of the GNU MP Library.
       8  
       9  The GNU MP Library is free software; you can redistribute it and/or modify
      10  it under the terms of either:
      11  
      12    * the GNU Lesser General Public License as published by the Free
      13      Software Foundation; either version 3 of the License, or (at your
      14      option) any later version.
      15  
      16  or
      17  
      18    * the GNU General Public License as published by the Free Software
      19      Foundation; either version 2 of the License, or (at your option) any
      20      later version.
      21  
      22  or both in parallel, as here.
      23  
      24  The GNU MP Library is distributed in the hope that it will be useful, but
      25  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      26  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      27  for more details.
      28  
      29  You should have received copies of the GNU General Public License and the
      30  GNU Lesser General Public License along with the GNU MP Library.  If not,
      31  see https://www.gnu.org/licenses/.  */
      32  
      33  #include <stdio.h>
      34  #include "gmp-impl.h"
      35  #include "longlong.h"
      36  
      37  size_t
      38  mpz_out_str (FILE *stream, int base, mpz_srcptr x)
      39  {
      40    mp_ptr xp;
      41    mp_size_t x_size = SIZ (x);
      42    unsigned char *str;
      43    size_t str_size;
      44    size_t i;
      45    size_t written;
      46    const char *num_to_text;
      47    TMP_DECL;
      48  
      49    if (stream == 0)
      50      stream = stdout;
      51  
      52    num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
      53    if (base > 1)
      54      {
      55        if (base <= 36)
      56  	num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
      57        else if (UNLIKELY (base > 62))
      58  	    return 0;
      59      }
      60    else if (base > -2)
      61      {
      62        base = 10;
      63      }
      64    else
      65      {
      66        base = -base;
      67        if (UNLIKELY (base > 36))
      68  	return 0;
      69      }
      70  
      71    written = 0;
      72  
      73    if (x_size < 0)
      74      {
      75        fputc ('-', stream);
      76        x_size = -x_size;
      77        written = 1;
      78      }
      79  
      80    TMP_MARK;
      81  
      82    DIGITS_IN_BASE_PER_LIMB (str_size, x_size, base);
      83    str_size += 3;
      84    str = (unsigned char *) TMP_ALLOC (str_size);
      85  
      86    xp = PTR (x);
      87    if (! POW2_P (base))
      88      {
      89        xp = TMP_ALLOC_LIMBS (x_size | 1);  /* |1 in case x_size==0 */
      90        MPN_COPY (xp, PTR (x), x_size);
      91      }
      92  
      93    str_size = mpn_get_str (str, base, xp, x_size);
      94  
      95    /* Convert result to printable chars.  */
      96    for (i = 0; i < str_size; i++)
      97      str[i] = num_to_text[str[i]];
      98    str[str_size] = 0;
      99  
     100    {
     101      size_t fwret;
     102      fwret = fwrite ((char *) str, 1, str_size, stream);
     103      written += fwret;
     104    }
     105  
     106    TMP_FREE;
     107    return ferror (stream) ? 0 : written;
     108  }