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

   1 /* -*-c-*-
   2  *
   3  * $Id: mptext-dstr.c,v 1.3 2000/08/04 23:23:44 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 1.3  2000/08/04 23:23:44  mdw
  34  * Various <ctype.h> fixes.
  35  *
  36  * Revision 1.2  1999/12/22 15:56:21  mdw
  37  * Make the buffer passed to `put' op constant.
  38  *
  39  * Revision 1.1  1999/11/17 18:02:16  mdw
  40  * New multiprecision integer arithmetic suite.
  41  *
  42  */
  43
  44 /*----- Header files ------------------------------------------------------*/
  45
  46 #include <mLib/dstr.h>
  47
  48 #include "mptext.h"
  49
  50 /*----- Main code ---------------------------------------------------------*/
  51
  52 /* --- Operations table --- */
  53
  54 static int get(void *p)
  55 {
  56   mptext_dstrctx *c = p;
  57   if (c->i >= c->d->len)
  58     return (EOF);
  59   return ((unsigned char)c->d->buf[c->i++]);
  60 }
  61
  62 static void unget(int ch, void *p)
  63 {
  64   mptext_dstrctx *c = p;
  65   if (ch == EOF || c->i == 0)
  66     return;
  67   c->i--;
  68 }
  69
  70 static int put(const char *s, size_t sz, void *p)
  71 {
  72   mptext_dstrctx *c = p;
  73   DPUTM(c->d, s, sz);
  74   return (0);
  75 }
  76
  77 const mptext_ops mptext_dstrops = { get, unget, put };
  78
  79 /* --- Convenience functions --- */
  80
  81 mp *mp_readdstr(mp *m, dstr *d, size_t *off, int radix)
  82 {
  83   mptext_dstrctx c;
  84   c.d = d;
  85   c.i = off ? *off : 0;
  86   m = mp_read(m, radix, &mptext_dstrops, &c);
  87   if (off)
  88     *off = c.i;
  89   return (m);
  90 }
  91
  92 int mp_writedstr(mp *m, dstr *d, int radix)
  93 {
  94   mptext_dstrctx c;
  95   int rc;
  96   c.d = d;
  97   rc = mp_write(m, radix, &mptext_dstrops, &c);
  98   DPUTZ(d);
  99   return (rc);
 100 }
 101
 102 /*----- That's all, folks -------------------------------------------------*/