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

   1 /* -*-c-*-
   2  *
   3  * Textual representation of multiprecision numbers
   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 #ifndef CATACOMB_MPTEXT_H
  29 #define CATACOMB_MPTEXT_H
  30
  31 #ifdef __cplusplus
  32   extern "C" {
  33 #endif
  34
  35 /*----- Header files ------------------------------------------------------*/
  36
  37 #ifndef CATACOMB_MP_H
  38 #  include "mp.h"
  39 #endif
  40
  41 /*----- Data structures ---------------------------------------------------*/
  42
  43 typedef struct mptext_ops {
  44   int (*get)(void */*p*/);
  45   void (*unget)(int /*ch*/, void */*p*/);
  46   int (*put)(const char */*s*/, size_t /*len*/, void */*p*/);
  47 } mptext_ops;
  48
  49 /*----- Functions provided ------------------------------------------------*/
  50
  51 /* --- @mp_read@ --- *
  52  *
  53  * Arguments:   @mp *m@ = destination multiprecision number
  54  *              @int radix@ = base to assume for data (or zero to guess)
  55  *              @const mptext_ops *ops@ = pointer to operations block
  56  *              @void *p@ = data for the operations block
  57  *
  58  * Returns:     The integer read, or zero if it didn't work.
  59  *
  60  * Use:         Reads an integer from some source.  If the @radix@ is
  61  *              specified, the number is assumed to be given in that radix,
  62  *              with the letters `a' (either upper- or lower-case) upwards
  63  *              standing for digits greater than 9.  Otherwise, base 10 is
  64  *              assumed unless the number starts with `0' (octal), `0x' (hex)
  65  *              or `nnn_' (base `nnn').  An arbitrary amount of whitespace
  66  *              before the number is ignored.
  67  */
  68
  69 extern mp *mp_read(mp */*m*/, int /*radix*/,
  70                    const mptext_ops */*ops*/, void */*p*/);
  71
  72 /* --- @mp_write@ --- *
  73  *
  74  * Arguments:   @mp *m@ = pointer to a multi-precision integer
  75  *              @int radix@ = radix to use when writing the number out
  76  *              @const mptext_ops *ops@ = pointer to an operations block
  77  *              @void *p@ = data for the operations block
  78  *
  79  * Returns:     Zero if it worked, nonzero otherwise.
  80  *
  81  * Use:         Writes a large integer in textual form.
  82  */
  83
  84 extern int mp_write(mp */*m*/, int /*radix*/,
  85                     const mptext_ops */*ops*/, void */*p*/);
  86
  87 /* --- @mptext_len@ --- *
  88  *
  89  * Arguments:   @mp *x@ = number to work on
  90  *              @int r@ = radix the number will be expressed in
  91  *
  92  * Returns:     The number of digits needed to represent the number in the
  93  *              given base.  This will not include space for a leading sign
  94  *              (use @MP_NEGP@ to check that, or just add one on for luck);
  95  *              neither will it add space for a terminating null.  In general
  96  *              the answer will be an overestimate.
  97  */
  98
  99 extern size_t mptext_len(mp */*x*/, int /*r*/);
 100
 101 /*----- File I/O ----------------------------------------------------------*/
 102
 103 #include <stdio.h>
 104
 105 /* --- Operations table --- *
 106  *
 107  * The @mptext_fileops@ expect the pointer argument to be a @FILE *@.
 108  */
 109
 110 extern const mptext_ops mptext_fileops;
 111
 112 /* --- Convenience functions --- */
 113
 114 extern mp *mp_readfile(mp */*m*/, FILE */*fp*/, int /*radix*/);
 115 extern int mp_writefile(mp */*m*/, FILE */*fp*/, int /*radix*/);
 116
 117 #define MP_DOFPRINTFR(fp, args, m, r) do {                              \
 118   fprintf args;                                                         \
 119   if (m)                                                                \
 120     mp_writefile(m, fp, r);                                             \
 121   else                                                                  \
 122     fputs("<null>", fp);                                                \
 123   fputc('\n', fp);                                                      \
 124 } while (0)
 125
 126 #define MP_DOFPRINTR(fp, name, m, r)                                    \
 127   MP_DOFPRINTFR(fp, (fp, "%s = ", name), m, r)
 128
 129 #define MP_PRINT(name, m) MP_DOFPRINTR(stdout, name, m, 10)
 130 #define MP_EPRINT(name, m) MP_DOFPRINTR(stderr, name, m, 10)
 131 #define MP_PRINTX(name, m) MP_DOFPRINTR(stdout, name, m, 16)
 132 #define MP_EPRINTX(name, m) MP_DOFPRINTR(stderr, name, m, 16)
 133
 134 #define MP_FPRINTF(fp, args, m) MP_DOFPRINTFR(fp, args, m, 10)
 135 #define MP_FPRINTFX(fp, args, m) MP_DOFPRINTFR(fp, args, m, 16)
 136
 137 /*----- String I/O --------------------------------------------------------*/
 138
 139 /* --- Context format --- */
 140
 141 typedef struct mptext_stringctx {
 142   char *buf;
 143   char *lim;
 144 } mptext_stringctx;
 145
 146 /* --- Operations table --- */
 147
 148 extern const mptext_ops mptext_stringops;
 149
 150 /* --- Convenience functions --- */
 151
 152 extern mp *mp_readstring(mp */*m*/, const char */*p*/, char **/*end*/,
 153                          int /*radix*/);
 154 extern int mp_writestring(mp */*m*/, char */*p*/, size_t /*sz*/,
 155                           int /*radix*/);
 156
 157 /*----- Dynamic string I/O ------------------------------------------------*/
 158
 159 #include <mLib/dstr.h>
 160
 161 /* --- Context format --- */
 162
 163 typedef struct mptext_dstrctx {
 164   dstr *d;
 165   size_t i;
 166 } mptext_dstrctx;
 167
 168 /* --- Operations table --- */
 169
 170 extern const mptext_ops mptext_dstrops;
 171
 172 /* --- Convenience functions --- */
 173
 174 extern mp *mp_readdstr(mp */*m*/, dstr */*d*/, size_t */*off*/,
 175                        int /*radix*/);
 176 extern int mp_writedstr(mp */*m*/, dstr */*d*/, int /*radix*/);
 177
 178 /*----- That's all, folks -------------------------------------------------*/
 179
 180 #ifdef __cplusplus
 181   }
 182 #endif
 183
 184 #endif