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

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Textual representation of multiprecision numbers
   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 #ifndef CATACOMB_MPTEXT_H
  31 #define CATACOMB_MPTEXT_H
  32
  33 #ifdef __cplusplus
  34   extern "C" {
  35 #endif
  36
  37 /*----- Header files ------------------------------------------------------*/
  38
  39 #ifndef CATACOMB_MP_H
  40 #  include "mp.h"
  41 #endif
  42
  43 /*----- Data structures ---------------------------------------------------*/
  44
  45 typedef struct mptext_ops {
  46   int (*get)(void */*p*/);
  47   void (*unget)(int /*ch*/, void */*p*/);
  48   int (*put)(const char */*s*/, size_t /*len*/, void */*p*/);
  49 } mptext_ops;
  50
  51 /*----- Functions provided ------------------------------------------------*/
  52
  53 /* --- @mp_read@ --- *
  54  *
  55  * Arguments:   @mp *m@ = destination multiprecision number
  56  *              @int radix@ = base to assume for data (or zero to guess)
  57  *              @const mptext_ops *ops@ = pointer to operations block
  58  *              @void *p@ = data for the operations block
  59  *
  60  * Returns:     The integer read, or zero if it didn't work.
  61  *
  62  * Use:         Reads an integer from some source.  If the @radix@ is
  63  *              specified, the number is assumed to be given in that radix,
  64  *              with the letters `a' (either upper- or lower-case) upwards
  65  *              standing for digits greater than 9.  Otherwise, base 10 is
  66  *              assumed unless the number starts with `0' (octal), `0x' (hex)
  67  *              or `nnn_' (base `nnn').  An arbitrary amount of whitespace
  68  *              before the number is ignored.
  69  */
  70
  71 extern mp *mp_read(mp */*m*/, int /*radix*/,
  72                    const mptext_ops */*ops*/, void */*p*/);
  73
  74 /* --- @mp_write@ --- *
  75  *
  76  * Arguments:   @mp *m@ = pointer to a multi-precision integer
  77  *              @int radix@ = radix to use when writing the number out
  78  *              @const mptext_ops *ops@ = pointer to an operations block
  79  *              @void *p@ = data for the operations block
  80  *
  81  * Returns:     Zero if it worked, nonzero otherwise.
  82  *
  83  * Use:         Writes a large integer in textual form.
  84  */
  85
  86 extern int mp_write(mp */*m*/, int /*radix*/,
  87                     const mptext_ops */*ops*/, void */*p*/);
  88
  89 /* --- @mptext_len@ --- *
  90  *
  91  * Arguments:   @mp *x@ = number to work on
  92  *              @int r@ = radix the number will be expressed in
  93  *
  94  * Returns:     The number of digits needed to represent the number in the
  95  *              given base.  This will not include space for a leading sign
  96  *              (use @MP_NEGP@ to check that, or just add one on for luck);
  97  *              neither will it add space for a terminating null.  In general
  98  *              the answer will be an overestimate.
  99  */
 100
 101 extern size_t mptext_len(mp */*x*/, int /*r*/);
 102
 103 /*----- File I/O ----------------------------------------------------------*/
 104
 105 #include <stdio.h>
 106
 107 /* --- Operations table --- *
 108  *
 109  * The @mptext_fileops@ expect the pointer argument to be a @FILE *@.
 110  */
 111
 112 extern const mptext_ops mptext_fileops;
 113
 114 /* --- Convenience functions --- */
 115
 116 extern mp *mp_readfile(mp */*m*/, FILE */*fp*/, int /*radix*/);
 117 extern int mp_writefile(mp */*m*/, FILE */*fp*/, int /*radix*/);
 118
 119 #define MP_DOFPRINTFR(fp, args, m, r) do {                              \
 120   fprintf args;                                                         \
 121   if (m)                                                                \
 122     mp_writefile(m, fp, r);                                             \
 123   else                                                                  \
 124     fputs("<null>", fp);                                                \
 125   fputc('\n', fp);                                                      \
 126 } while (0)
 127
 128 #define MP_DOFPRINTR(fp, name, m, r)                                    \
 129   MP_DOFPRINTFR(fp, (fp, "%s = ", name), m, r)
 130
 131 #define MP_PRINT(name, m) MP_DOFPRINTR(stdout, name, m, 10)
 132 #define MP_EPRINT(name, m) MP_DOFPRINTR(stderr, name, m, 10)
 133 #define MP_PRINTX(name, m) MP_DOFPRINTR(stdout, name, m, 16)
 134 #define MP_EPRINTX(name, m) MP_DOFPRINTR(stderr, name, m, 16)
 135
 136 #define MP_FPRINTF(fp, args, m) MP_DOFPRINTFR(fp, args, m, 10)
 137 #define MP_FPRINTFX(fp, args, m) MP_DOFPRINTFR(fp, args, m, 16)
 138
 139 /*----- String I/O --------------------------------------------------------*/
 140
 141 /* --- Context format --- */
 142
 143 typedef struct mptext_stringctx {
 144   char *buf;
 145   char *lim;
 146 } mptext_stringctx;
 147
 148 /* --- Operations table --- */
 149
 150 extern const mptext_ops mptext_stringops;
 151
 152 /* --- Convenience functions --- */
 153
 154 extern mp *mp_readstring(mp */*m*/, const char */*p*/, char **/*end*/,
 155                          int /*radix*/);
 156 extern int mp_writestring(mp */*m*/, char */*p*/, size_t /*sz*/,
 157                           int /*radix*/);
 158
 159 /*----- Dynamic string I/O ------------------------------------------------*/
 160
 161 #include <mLib/dstr.h>
 162
 163 /* --- Context format --- */
 164
 165 typedef struct mptext_dstrctx {
 166   dstr *d;
 167   size_t i;
 168 } mptext_dstrctx;
 169
 170 /* --- Operations table --- */
 171
 172 extern const mptext_ops mptext_dstrops;
 173
 174 /* --- Convenience functions --- */
 175
 176 extern mp *mp_readdstr(mp */*m*/, dstr */*d*/, size_t */*off*/,
 177                        int /*radix*/);
 178 extern int mp_writedstr(mp */*m*/, dstr */*d*/, int /*radix*/);
 179
 180 /*----- That's all, folks -------------------------------------------------*/
 181
 182 #ifdef __cplusplus
 183   }
 184 #endif
 185
 186 #endif