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

   1 /* -*-c-*-
   2  *
   3  * $Id: genprimes.c,v 1.5 2004/04/01 12:50:09 mdw Exp $
   4  *
   5  * Generate prime number table
   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: genprimes.c,v $
  33  * Revision 1.5  2004/04/01 12:50:09  mdw
  34  * Add cyclic group abstraction, with test code.  Separate off exponentation
  35  * functions for better static linking.  Fix a buttload of bugs on the way.
  36  * Generally ensure that negative exponents do inversion correctly.  Add
  37  * table of standard prime-field subgroups.  (Binary field subgroups are
  38  * currently unimplemented but easy to add if anyone ever finds a good one.)
  39  *
  40  * Revision 1.4  2001/03/04 13:08:10  mdw
  41  * Use @DA_LAST@ to determine @MAXPRIME@, now that it exists.
  42  *
  43  * Revision 1.3  2000/08/15 21:41:58  mdw
  44  * Create a new type for the small primes table elements.
  45  *
  46  * Revision 1.2  1999/12/22 15:48:39  mdw
  47  * Rename output file.  Make output constants unsigned.
  48  *
  49  * Revision 1.1  1999/11/19 13:19:37  mdw
  50  * Generate small primes table.
  51  *
  52  */
  53
  54 /*----- Header files ------------------------------------------------------*/
  55
  56 #include <ctype.h>
  57 #include <errno.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61
  62 #include <mLib/darray.h>
  63 #include <mLib/dstr.h>
  64 #include <mLib/mdwopt.h>
  65 #include <mLib/quis.h>
  66 #include <mLib/report.h>
  67
  68 /*----- Data structures ---------------------------------------------------*/
  69
  70 DA_DECL(intv, int);
  71
  72 /*----- Main code ---------------------------------------------------------*/
  73
  74 int main(int argc, char *argv[])
  75 {
  76   int p_max = 0, p_n = 0;
  77   char *type = "unsigned int";
  78   char *header = "primetab.h";
  79   char *source = "primetab.c";
  80   char *name = "primetab";
  81   char *sym = 0;
  82   intv p = DA_INIT;
  83   int i;
  84
  85   ego(argv[0]);
  86
  87   for (;;) {
  88     int i = getopt(argc, argv, "h:c:i:n:m:t:s:");
  89     if (i < 0)
  90       break;
  91     switch (i) {
  92       case 'h':
  93         header = optarg;
  94         break;
  95       case 'c':
  96         source = optarg;
  97         break;
  98       case 'i':
  99         name = optarg;
 100         break;
 101       case 'n':
 102         p_max = 0;
 103         p_n = atoi(optarg);
 104         break;
 105       case 'm':
 106         p_n = 0;
 107         p_max = atoi(optarg);
 108         break;
 109       case 't':
 110         type = optarg;
 111         break;
 112       case 's':
 113         sym = optarg;
 114         break;
 115       default:
 116         pquis(stderr, "Usage: $ [-n nprimes] [-m maxprime] [-t type]\n");
 117         exit(EXIT_FAILURE);
 118     }
 119   }
 120
 121   if (!p_max && !p_n)
 122     die(EXIT_FAILURE, "bad arguments to `-n' or `-m'");
 123
 124   if (p_n || p_max >= 2)
 125     DA_PUSH(&p, 2);
 126   for (i = 3; (!p_max && !p_n) ||
 127               (p_n && DA_LEN(&p) < p_n) ||
 128               (p_max && i <= p_max);
 129        i += 2) {
 130     int j;
 131     for (j = 0; j < DA_LEN(&p); j++) {
 132       if (i % DA(&p)[j] == 0)
 133         goto composite;
 134     }
 135     DA_PUSH(&p, i);
 136   composite:;
 137   }
 138
 139   {
 140     FILE *fp = fopen(header, "w");
 141     dstr d = DSTR_INIT;
 142     char *q;
 143     if (!fp)
 144       die(EXIT_FAILURE, "couldn't write `%s': %s", header, strerror(errno));
 145     if (!sym) {
 146       for (q = header; *q; q++) {
 147         int ch = (unsigned char)*q;
 148         if (isalnum(ch))
 149           ch = toupper(ch);
 150         else
 151           ch = '_';
 152         DPUTC(&d, ch);
 153       }
 154       DPUTZ(&d);
 155       sym = d.buf;
 156     }
 157     fprintf(fp, "\
 158 /* -*-c-*-\n\
 159  *\n\
 160  * Table of small prime numbers [generated]\n\
 161  */\n\
 162 \n\
 163 #ifndef %s\n\
 164 #define %s\n\
 165 \n\
 166 #define NPRIME %luu\n\
 167 #define MAXPRIME %uu\n\
 168 \n\
 169 typedef %s smallprime;\n\
 170 extern smallprime %s[];\n\
 171 \n\
 172 #endif\n\
 173 ",
 174             sym, sym,
 175             (unsigned long)DA_LEN(&p),
 176             DA_LAST(&p),
 177             type, name);
 178     dstr_destroy(&d);
 179     if (fclose(fp) == EOF) {
 180       remove(header);
 181       die(EXIT_FAILURE, "error writing `%s': %s", header, strerror(errno));
 182     }
 183   }
 184
 185   {
 186     FILE *fp = fopen(source, "w");
 187     int i;
 188     if (!fp)
 189       die(EXIT_FAILURE, "couldn't write `%s': %s", source, strerror(errno));
 190     fprintf(fp, "\
 191 /* -*-c-*-\n\
 192  *\n\
 193  * Table of small prime numbers [generated]\n\
 194  */\n\
 195 \n\
 196 #include \"%s\"\n\
 197 \n\
 198 %s %s[] = {",
 199             header, type, name);
 200     for (i = 0; i < DA_LEN(&p); i++) {
 201       if (i % 8 == 0)
 202         fputs("\n  ", fp);
 203       fprintf(fp, "%5i, ", DA(&p)[i]);
 204     }
 205     fputs("\n\
 206 };\n\
 207 ", fp);
 208     if (fclose(fp) == EOF) {
 209       remove(source);
 210       die(EXIT_FAILURE, "error writing `%s': %s", source, strerror(errno));
 211     }
 212   }
 213
 214   return (0);
 215 }
 216
 217 /*----- That's all, folks -------------------------------------------------*/