git.distorted.org.uk Git - u/mdw/catacomb/blob - math/mptext-dstr.c

   1 /* -*-c-*-
   2  *
   3  * Reading and writing large integers on strings
   4  *
   5  * (c) 1999 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <mLib/dstr.h>
  31
  32 #include "mptext.h"
  33
  34 /*----- Main code ---------------------------------------------------------*/
  35
  36 /* --- Operations table --- */
  37
  38 static int get(void *p)
  39 {
  40   mptext_dstrctx *c = p;
  41   if (c->i >= c->d->len)
  42     return (EOF);
  43   return ((unsigned char)c->d->buf[c->i++]);
  44 }
  45
  46 static void unget(int ch, void *p)
  47 {
  48   mptext_dstrctx *c = p;
  49   if (ch == EOF || c->i == 0)
  50     return;
  51   c->i--;
  52 }
  53
  54 static int put(const char *s, size_t sz, void *p)
  55 {
  56   mptext_dstrctx *c = p;
  57   DPUTM(c->d, s, sz);
  58   return (0);
  59 }
  60
  61 const mptext_ops mptext_dstrops = { get, unget, put };
  62
  63 /* --- Convenience functions --- */
  64
  65 mp *mp_readdstr(mp *m, dstr *d, size_t *off, int radix)
  66 {
  67   mptext_dstrctx c;
  68   c.d = d;
  69   c.i = off ? *off : 0;
  70   m = mp_read(m, radix, &mptext_dstrops, &c);
  71   if (off)
  72     *off = c.i;
  73   return (m);
  74 }
  75
  76 int mp_writedstr(mp *m, dstr *d, int radix)
  77 {
  78   mptext_dstrctx c;
  79   int rc;
  80   c.d = d;
  81   rc = mp_write(m, radix, &mptext_dstrops, &c);
  82   DPUTZ(d);
  83   return (rc);
  84 }
  85
  86 /*----- That's all, folks -------------------------------------------------*/