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

   1 /* -*-c-*-
   2  *
   3  * $Id: genprimes.c,v 1.7 2004/04/08 01:36:15 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 /*----- Header files ------------------------------------------------------*/
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37
  38 #include <mLib/darray.h>
  39 #include <mLib/dstr.h>
  40 #include <mLib/mdwopt.h>
  41 #include <mLib/quis.h>
  42 #include <mLib/report.h>
  43
  44 /*----- Data structures ---------------------------------------------------*/
  45
  46 DA_DECL(intv, int);
  47
  48 /*----- Main code ---------------------------------------------------------*/
  49
  50 int main(int argc, char *argv[])
  51 {
  52   int p_max = 0, p_n = 0;
  53   char *type = "unsigned int";
  54   char *header = "primetab.h";
  55   char *source = "primetab.c";
  56   char *name = "primetab";
  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 (p_n || p_max >= 2)
 101     DA_PUSH(&p, 2);
 102   for (i = 3; (!p_max && !p_n) ||
 103               (p_n && DA_LEN(&p) < p_n) ||
 104               (p_max && i <= p_max);
 105        i += 2) {
 106     int j;
 107     for (j = 0; j < DA_LEN(&p); j++) {
 108       if (i % DA(&p)[j] == 0)
 109         goto composite;
 110     }
 111     DA_PUSH(&p, i);
 112   composite:;
 113   }
 114
 115   {
 116     FILE *fp = fopen(header, "w");
 117     dstr d = DSTR_INIT;
 118     char *q;
 119     if (!fp)
 120       die(EXIT_FAILURE, "couldn't write `%s': %s", header, strerror(errno));
 121     if (!sym) {
 122       for (q = header; *q; q++) {
 123         int ch = (unsigned char)*q;
 124         if (isalnum(ch))
 125           ch = toupper(ch);
 126         else
 127           ch = '_';
 128         DPUTC(&d, ch);
 129       }
 130       DPUTZ(&d);
 131       sym = d.buf;
 132     }
 133     fprintf(fp, "\
 134 /* -*-c-*-\n\
 135  *\n\
 136  * Table of small prime numbers [generated]\n\
 137  */\n\
 138 \n\
 139 #ifndef %s\n\
 140 #define %s\n\
 141 \n\
 142 #define NPRIME %luu\n\
 143 #define MAXPRIME %uu\n\
 144 \n\
 145 typedef %s smallprime;\n\
 146 extern const smallprime %s[];\n\
 147 \n\
 148 #endif\n\
 149 ",
 150             sym, sym,
 151             (unsigned long)DA_LEN(&p),
 152             DA_LAST(&p),
 153             type, name);
 154     dstr_destroy(&d);
 155     if (fclose(fp) == EOF) {
 156       remove(header);
 157       die(EXIT_FAILURE, "error writing `%s': %s", header, strerror(errno));
 158     }
 159   }
 160
 161   {
 162     FILE *fp = fopen(source, "w");
 163     int i;
 164     if (!fp)
 165       die(EXIT_FAILURE, "couldn't write `%s': %s", source, strerror(errno));
 166     fprintf(fp, "\
 167 /* -*-c-*-\n\
 168  *\n\
 169  * Table of small prime numbers [generated]\n\
 170  */\n\
 171 \n\
 172 #include \"%s\"\n\
 173 \n\
 174 const %s %s[] = {",
 175             header, type, name);
 176     for (i = 0; i < DA_LEN(&p); i++) {
 177       if (i % 8 == 0)
 178         fputs("\n  ", fp);
 179       fprintf(fp, "%5i, ", DA(&p)[i]);
 180     }
 181     fputs("\n\
 182 };\n\
 183 ", fp);
 184     if (fclose(fp) == EOF) {
 185       remove(source);
 186       die(EXIT_FAILURE, "error writing `%s': %s", source, strerror(errno));
 187     }
 188   }
 189
 190   return (0);
 191 }
 192
 193 /*----- That's all, folks -------------------------------------------------*/