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

   1 /* -*-c-*-
   2  *
   3  * Generate prime number table
   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 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <ctype.h>
  31 #include <errno.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include <mLib/darray.h>
  37 #include <mLib/dstr.h>
  38 #include <mLib/mdwopt.h>
  39 #include <mLib/quis.h>
  40 #include <mLib/report.h>
  41
  42 /*----- Data structures ---------------------------------------------------*/
  43
  44 DA_DECL(intv, int);
  45
  46 /*----- Main code ---------------------------------------------------------*/
  47
  48 int main(int argc, char *argv[])
  49 {
  50   int p_max = 0, p_n = 0;
  51   char *type = "unsigned int";
  52   char *header = "primetab.h";
  53   char *source = "primetab.c";
  54   char *name = "primetab";
  55   char *sym = 0;
  56   intv p = DA_INIT;
  57   int i;
  58
  59   ego(argv[0]);
  60
  61   for (;;) {
  62     int i = getopt(argc, argv, "h:c:i:n:m:t:s:");
  63     if (i < 0)
  64       break;
  65     switch (i) {
  66       case 'h':
  67         header = optarg;
  68         break;
  69       case 'c':
  70         source = optarg;
  71         break;
  72       case 'i':
  73         name = optarg;
  74         break;
  75       case 'n':
  76         p_max = 0;
  77         p_n = atoi(optarg);
  78         break;
  79       case 'm':
  80         p_n = 0;
  81         p_max = atoi(optarg);
  82         break;
  83       case 't':
  84         type = optarg;
  85         break;
  86       case 's':
  87         sym = optarg;
  88         break;
  89       default:
  90         pquis(stderr, "Usage: $ [-n nprimes] [-m maxprime] [-t type]\n");
  91         exit(EXIT_FAILURE);
  92     }
  93   }
  94
  95   if (!p_max && !p_n)
  96     die(EXIT_FAILURE, "bad arguments to `-n' or `-m'");
  97
  98   if (p_n || p_max >= 2)
  99     DA_PUSH(&p, 2);
 100   for (i = 3; (!p_max && !p_n) ||
 101               (p_n && DA_LEN(&p) < p_n) ||
 102               (p_max && i <= p_max);
 103        i += 2) {
 104     int j;
 105     for (j = 0; j < DA_LEN(&p); j++) {
 106       if (i % DA(&p)[j] == 0)
 107         goto composite;
 108     }
 109     DA_PUSH(&p, i);
 110   composite:;
 111   }
 112
 113   {
 114     FILE *fp = fopen(header, "w");
 115     dstr d = DSTR_INIT;
 116     char *q;
 117     if (!fp)
 118       die(EXIT_FAILURE, "couldn't write `%s': %s", header, strerror(errno));
 119     if (!sym) {
 120       for (q = header; *q; q++) {
 121         int ch = (unsigned char)*q;
 122         if (isalnum(ch))
 123           ch = toupper(ch);
 124         else
 125           ch = '_';
 126         DPUTC(&d, ch);
 127       }
 128       DPUTZ(&d);
 129       sym = d.buf;
 130     }
 131     fprintf(fp, "\
 132 /* -*-c-*-\n\
 133  *\n\
 134  * Table of small prime numbers [generated]\n\
 135  */\n\
 136 \n\
 137 #ifndef %s\n\
 138 #define %s\n\
 139 \n\
 140 #define NPRIME %luu\n\
 141 #define MAXPRIME %uu\n\
 142 \n\
 143 typedef %s smallprime;\n\
 144 extern const smallprime %s[];\n\
 145 \n\
 146 #endif\n\
 147 ",
 148             sym, sym,
 149             (unsigned long)DA_LEN(&p),
 150             DA_LAST(&p),
 151             type, name);
 152     dstr_destroy(&d);
 153     if (fclose(fp) == EOF) {
 154       remove(header);
 155       die(EXIT_FAILURE, "error writing `%s': %s", header, strerror(errno));
 156     }
 157   }
 158
 159   {
 160     FILE *fp = fopen(source, "w");
 161     int i;
 162     if (!fp)
 163       die(EXIT_FAILURE, "couldn't write `%s': %s", source, strerror(errno));
 164     fprintf(fp, "\
 165 /* -*-c-*-\n\
 166  *\n\
 167  * Table of small prime numbers [generated]\n\
 168  */\n\
 169 \n\
 170 #include \"%s\"\n\
 171 \n\
 172 const %s %s[] = {",
 173             header, type, name);
 174     for (i = 0; i < DA_LEN(&p); i++) {
 175       if (i % 8 == 0)
 176         fputs("\n  ", fp);
 177       fprintf(fp, "%5i, ", DA(&p)[i]);
 178     }
 179     fputs("\n\
 180 };\n\
 181 ", fp);
 182     if (fclose(fp) == EOF) {
 183       remove(source);
 184       die(EXIT_FAILURE, "error writing `%s': %s", source, strerror(errno));
 185     }
 186   }
 187
 188   return (0);
 189 }
 190
 191 /*----- That's all, folks -------------------------------------------------*/