mdw@git.distorted.org.uk Git - catacomb/blob - math/genwheel.c

   1 /* -*-c-*-
   2  *
   3  * Generate a prime-iteration wheel
   4  *
   5  * (c) 2007 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(uintv, unsigned int);
  45
  46 /*----- Main code ---------------------------------------------------------*/
  47
  48 static unsigned long gcd(unsigned long a, unsigned long b)
  49 {
  50   int t;
  51   if (!a) return (b);
  52   while (b) { t = a%b; a = b; b = t; }
  53   return (a);
  54 }
  55
  56 int main(int argc, char *argv[])
  57 {
  58   int np = 5;
  59   const char *type = "unsigned char";
  60   const char *source = "wheel.c";
  61   const char *header = "wheel.h";
  62   const char *name = "wheel";
  63   const char *sym = 0;
  64   const char *hdrbase;
  65   unsigned long i, n;
  66   unsigned long mod;
  67   int o;
  68   uintv v = DA_INIT;
  69
  70   ego(argv[0]);
  71   for (;;) {
  72     o = getopt(argc, argv, "n:c:h:s:t:i:");
  73     if (o < 0)
  74       break;
  75     switch (o) {
  76       case 'n':
  77         np = atoi(optarg);
  78         break;
  79       case 's':
  80         sym = optarg;
  81         break;
  82       case 'c':
  83         source = optarg;
  84         break;
  85       case 'h':
  86         header = optarg;
  87         break;
  88       case 't':
  89         type = optarg;
  90         break;
  91       case 'i':
  92         name = optarg;
  93         break;
  94       default:
  95         pquis(stderr, "Usage: $ [-n nprimes] [-s source] [-h header]\n");
  96         exit(EXIT_FAILURE);
  97     }
  98   }
  99
 100   if ((hdrbase = strrchr(header, '/')) == 0) hdrbase = header;
 101   else hdrbase++;
 102
 103   for (mod = 1, i = 2, n = 0;
 104        n < np;
 105        i++) {
 106     if (gcd(i, mod) == 1) {
 107       mod *= i;
 108       n++;
 109     }
 110   }
 111
 112   n = 1;
 113   for (i = 2; i < mod; i++) {
 114     if (gcd(mod, i) == 1) {
 115       DA_PUSH(&v, i - n);
 116       n = i;
 117     }
 118   }
 119   DA_PUSH(&v, mod + 1 - n);
 120
 121   {
 122     FILE *fp = fopen(header, "w");
 123     dstr d = DSTR_INIT;
 124     const char *q;
 125     if (!fp)
 126       die(EXIT_FAILURE, "couldn't write `%s': %s", header, strerror(errno));
 127     if (!sym) {
 128       for (q = header; *q; q++) {
 129         int ch = (unsigned char)*q;
 130         if (isalnum(ch))
 131           ch = toupper(ch);
 132         else
 133           ch = '_';
 134         DPUTC(&d, ch);
 135       }
 136       DPUTZ(&d);
 137       sym = d.buf;
 138     }
 139     fprintf(fp, "\
 140 /* -*-c-*-\n\
 141  *\n\
 142  * Wheel for small prime iteration [generated]\n\
 143  */\n\
 144 \n\
 145 #ifndef %s\n\
 146 #define %s\n\
 147 \n\
 148 #define WHEELN %luu\n\
 149 #define WHEELMOD %luu\n\
 150 \n\
 151 extern const %s %s[];\n\
 152 \n\
 153 #endif\n\
 154 ",
 155             sym, sym,
 156             (unsigned long)DA_LEN(&v),
 157             mod,
 158             type, name);
 159     dstr_destroy(&d);
 160     if (fclose(fp) == EOF) {
 161       remove(header);
 162       die(EXIT_FAILURE, "error writing `%s': %s", header, strerror(errno));
 163     }
 164   }
 165
 166   {
 167     FILE *fp = fopen(source, "w");
 168     int i;
 169     if (!fp)
 170       die(EXIT_FAILURE, "couldn't write `%s': %s", source, strerror(errno));
 171     fprintf(fp, "\
 172 /* -*-c-*-\n\
 173  *\n\
 174  * Wheel for small prime iteration [generated]\n\
 175  */\n\
 176 \n\
 177 #include \"%s\"\n\
 178 \n\
 179 const %s %s[] = {",
 180             hdrbase, type, name);
 181     for (i = 0; i < DA_LEN(&v); i++) {
 182       if (i % 8 == 0)
 183         fputs("\n  ", fp);
 184       fprintf(fp, "%5u, ", DA(&v)[i]);
 185     }
 186     fputs("\n\
 187 };\n\
 188 ", fp);
 189     if (fclose(fp) == EOF) {
 190       remove(source);
 191       die(EXIT_FAILURE, "error writing `%s': %s", source, strerror(errno));
 192     }
 193   }
 194
 195   return (0);
 196 }
 197
 198 /*----- That's all, folks -------------------------------------------------*/