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