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

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