source/libs/gmp/gmp-src/mpz/out_str.c

   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 }