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

   1 /* -*-c-*-
   2  *
   3  * $Id: mptext-dstr.c,v 1.1 1999/11/17 18:02:16 mdw Exp $
   4  *
   5  * Reading and writing large integers on strings
   6  *
   7  * (c) 1999 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Revision history --------------------------------------------------*
  31  *
  32  * $Log: mptext-dstr.c,v $
  33  * Revision 1.1  1999/11/17 18:02:16  mdw
  34  * New multiprecision integer arithmetic suite.
  35  *
  36  */
  37
  38 /*----- Header files ------------------------------------------------------*/
  39
  40 #include <mLib/dstr.h>
  41
  42 #include "mptext.h"
  43
  44 /*----- Main code ---------------------------------------------------------*/
  45
  46 /* --- Operations table --- */
  47
  48 static int get(void *p)
  49 {
  50   mptext_dstrctx *c = p;
  51   if (c->i >= c->d->len)
  52     return (EOF);
  53   return (c->d->buf[c->i++]);
  54 }
  55
  56 static void unget(int ch, void *p)
  57 {
  58   mptext_dstrctx *c = p;
  59   if (ch == EOF || c->i == 0)
  60     return;
  61   c->i--;
  62 }
  63
  64 static int put(char *s, size_t sz, void *p)
  65 {
  66   mptext_dstrctx *c = p;
  67   DPUTM(c->d, s, sz);
  68   return (0);
  69 }
  70
  71 const mptext_ops mptext_dstrops = { get, unget, put };
  72
  73 /* --- Convenience functions --- */
  74
  75 mp *mp_readdstr(mp *m, dstr *d, size_t *off, int radix)
  76 {
  77   mptext_dstrctx c;
  78   c.d = d;
  79   c.i = off ? *off : 0;
  80   m = mp_read(m, radix, &mptext_dstrops, &c);
  81   if (off)
  82     *off = c.i;
  83   return (m);
  84 }
  85
  86 int mp_writedstr(mp *m, dstr *d, int radix)
  87 {
  88   mptext_dstrctx c;
  89   int rc;
  90   c.d = d;
  91   rc = mp_write(m, radix, &mptext_dstrops, &c);
  92   DPUTZ(d);
  93   return (rc);
  94 }
  95
  96 /*----- That's all, folks -------------------------------------------------*/