mdw@git.distorted.org.uk Git - 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/macros.h>
  39 #include <mLib/mdwopt.h>
  40 #include <mLib/quis.h>
  41 #include <mLib/report.h>
  42
  43 /*----- Data structures ---------------------------------------------------*/
  44
  45 DA_DECL(intv, int);
  46
  47 /*----- Main code ---------------------------------------------------------*/
  48
  49 int main(int argc, char *argv[])
  50 {
  51   int p_max = 0, p_n = 0;
  52   char *type = "unsigned int";
  53   char *header = "primetab.h";
  54   char *source = "primetab.c";
  55   char *name = "primetab";
  56   char *hdrbase;
  57   char *sym = 0;
  58   intv p = DA_INIT;
  59   int i;
  60
  61   ego(argv[0]);
  62
  63   for (;;) {
  64     int i = getopt(argc, argv, "h:c:i:n:m:t:s:");
  65     if (i < 0)
  66       break;
  67     switch (i) {
  68       case 'h':
  69         header = optarg;
  70         break;
  71       case 'c':
  72         source = optarg;
  73         break;
  74       case 'i':
  75         name = optarg;
  76         break;
  77       case 'n':
  78         p_max = 0;
  79         p_n = atoi(optarg);
  80         break;
  81       case 'm':
  82         p_n = 0;
  83         p_max = atoi(optarg);
  84         break;
  85       case 't':
  86         type = optarg;
  87         break;
  88       case 's':
  89         sym = optarg;
  90         break;
  91       default:
  92         pquis(stderr, "Usage: $ [-n nprimes] [-m maxprime] [-t type]\n");
  93         exit(EXIT_FAILURE);
  94     }
  95   }
  96
  97   if (!p_max && !p_n)
  98     die(EXIT_FAILURE, "bad arguments to `-n' or `-m'");
  99
 100   if ((hdrbase = strrchr(header, '/')) == 0) hdrbase = header;
 101   else hdrbase++;
 102
 103   if (p_n || p_max >= 2)
 104     DA_PUSH(&p, 2);
 105   for (i = 3; (!p_max && !p_n) ||
 106               (p_n && DA_LEN(&p) < p_n) ||
 107               (p_max && i <= p_max);
 108        i += 2) {
 109     int j;
 110     for (j = 0; j < DA_LEN(&p); j++) {
 111       if (i % DA(&p)[j] == 0)
 112         goto composite;
 113     }
 114     DA_PUSH(&p, i);
 115   composite:;
 116   }
 117
 118   {
 119     FILE *fp = fopen(header, "w");
 120     dstr d = DSTR_INIT;
 121     char *q;
 122     if (!fp)
 123       die(EXIT_FAILURE, "couldn't write `%s': %s", header, strerror(errno));
 124     if (!sym) {
 125       for (q = header; *q; q++) {
 126         int ch = (unsigned char)*q;
 127         if (ISALNUM(ch))
 128           ch = TOUPPER(ch);
 129         else
 130           ch = '_';
 131         DPUTC(&d, ch);
 132       }
 133       DPUTZ(&d);
 134       sym = d.buf;
 135     }
 136     fprintf(fp, "\
 137 /* -*-c-*-\n\
 138  *\n\
 139  * Table of small prime numbers [generated]\n\
 140  */\n\
 141 \n\
 142 #ifndef %s\n\
 143 #define %s\n\
 144 \n\
 145 #define NPRIME %luu\n\
 146 #define MAXPRIME %uu\n\
 147 \n\
 148 typedef %s smallprime;\n\
 149 extern const smallprime %s[];\n\
 150 \n\
 151 #endif\n\
 152 ",
 153             sym, sym,
 154             (unsigned long)DA_LEN(&p),
 155             DA_LAST(&p),
 156             type, name);
 157     dstr_destroy(&d);
 158     if (fclose(fp) == EOF) {
 159       remove(header);
 160       die(EXIT_FAILURE, "error writing `%s': %s", header, strerror(errno));
 161     }
 162   }
 163
 164   {
 165     FILE *fp = fopen(source, "w");
 166     int i;
 167     if (!fp)
 168       die(EXIT_FAILURE, "couldn't write `%s': %s", source, strerror(errno));
 169     fprintf(fp, "\
 170 /* -*-c-*-\n\
 171  *\n\
 172  * Table of small prime numbers [generated]\n\
 173  */\n\
 174 \n\
 175 #include \"%s\"\n\
 176 \n\
 177 const %s %s[] = {",
 178             hdrbase, type, name);
 179     for (i = 0; i < DA_LEN(&p); i++) {
 180       if (i % 8 == 0)
 181         fputs("\n  ", fp);
 182       fprintf(fp, "%5i, ", DA(&p)[i]);
 183     }
 184     fputs("\n\
 185 };\n\
 186 ", fp);
 187     if (fclose(fp) == EOF) {
 188       remove(source);
 189       die(EXIT_FAILURE, "error writing `%s': %s", source, strerror(errno));
 190     }
 191   }
 192
 193   return (0);
 194 }
 195
 196 /*----- That's all, folks -------------------------------------------------*/