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