github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/mpz/out_str.c (about)

     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 Free Software
     5  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.h"
    35  #include "gmp-impl.h"
    36  #include "longlong.h"
    37  
    38  size_t
    39  mpz_out_str (FILE *stream, int base, mpz_srcptr x)
    40  {
    41    mp_ptr xp;
    42    mp_size_t x_size = SIZ (x);
    43    unsigned char *str;
    44    size_t str_size;
    45    size_t i;
    46    size_t written;
    47    const char *num_to_text;
    48    TMP_DECL;
    49  
    50    if (stream == 0)
    51      stream = stdout;
    52  
    53    if (base >= 0)
    54      {
    55        num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
    56        if (base <= 1)
    57  	base = 10;
    58        else if (base > 36)
    59  	{
    60  	  num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    61  	  if (base > 62)
    62  	    return 0;
    63  	}
    64      }
    65    else
    66      {
    67        base = -base;
    68        if (base <= 1)
    69  	base = 10;
    70        else if (base > 36)
    71  	return 0;
    72        num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    73      }
    74  
    75    written = 0;
    76  
    77    if (x_size < 0)
    78      {
    79        fputc ('-', stream);
    80        x_size = -x_size;
    81        written = 1;
    82      }
    83  
    84    TMP_MARK;
    85  
    86    DIGITS_IN_BASE_PER_LIMB (str_size, x_size, base);
    87    str_size += 3;
    88    str = (unsigned char *) TMP_ALLOC (str_size);
    89  
    90    xp = PTR (x);
    91    if (! POW2_P (base))
    92      {
    93        xp = TMP_ALLOC_LIMBS (x_size | 1);  /* |1 in case x_size==0 */
    94        MPN_COPY (xp, PTR (x), x_size);
    95      }
    96  
    97    str_size = mpn_get_str (str, base, xp, x_size);
    98  
    99    /* Convert result to printable chars.  */
   100    for (i = 0; i < str_size; i++)
   101      str[i] = num_to_text[str[i]];
   102    str[str_size] = 0;
   103  
   104    {
   105      size_t fwret;
   106      fwret = fwrite ((char *) str, 1, str_size, stream);
   107      written += fwret;
   108    }
   109  
   110    TMP_FREE;
   111    return ferror (stream) ? 0 : written;
   112  }