mdw@git.distorted.org.uk Git - mLib/blob - hash/unihash-mkstatic.c

   1 /* -*-c-*-
   2  *
   3  * Build static universal hash tables
   4  *
   5  * (c) 2003 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the mLib utilities library.
  11  *
  12  * mLib 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  * mLib 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 mLib; 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 "config.h"
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <stdlib.h>
  37
  38 #include "macros.h"
  39 #include "mdwopt.h"
  40 #include "quis.h"
  41 #include "report.h"
  42 #include "unihash.h"
  43
  44 /*----- Main code ---------------------------------------------------------*/
  45
  46 #define BSCOL 72
  47
  48 static unsigned long getint(const char *p, unsigned long max,
  49                             const char *what)
  50 {
  51   char *pp;
  52   unsigned long x = strtoul(p, &pp, 0);
  53   if (*pp || (max && x > max))
  54     die(EXIT_FAILURE, "bad %s `%s'", what, p);
  55   return (x);
  56 }
  57
  58 static void version(FILE *fp)
  59 {
  60   pquis(fp, "$, mLib version " VERSION "\n");
  61 }
  62
  63 static void usage(FILE *fp)
  64 {
  65   pquis(fp, "Usage: $ [-Cc] [-o FILE] [-g GUARD] [-i HEADER] [-s SYM]\n\
  66         [-k KEY]\n");
  67 }
  68
  69 static void help(FILE *fp)
  70 {
  71   version(fp);
  72   putc('\n', stdout);
  73   usage(fp);
  74   fputs("\n\
  75 Emits a precomputed unihash_info structure for a given key.\n\
  76 \n\
  77 -h, --help              Show this help text.\n\
  78 -v, --version           Show the program's version number.\n\
  79 -u, --usage             Show a terse usage message.\n\
  80 \n\
  81 -c, --c-source          Emit a C source file rather than a header.\n\
  82 -C, --const             Declare table to be `const' (only useful with `-c').\n\
  83 -k, --key=KEY           Use KEY as the universal hashing key.\n\
  84 -g, --guard=GUARD       Use GUARD as a multiple-inclusion guard constant.\n\
  85 -i, --include=HEADER    Include HEADER at top of C source file.\n\
  86 -s, --symbol=SYM        Name the generated table SYM.\n\
  87 -o, --output=FILE       Write the output to FILE.\n\
  88 ", stdout);
  89 }
  90
  91 int main(int argc, char *argv[])
  92 {
  93   uint32 key = 0xe07e5bd1;
  94   unsigned flags = 0;
  95   const char *sym = 0;
  96   const char *inc = 0;
  97   const char *guard = 0;
  98   const char *file = 0;
  99   FILE *fp;
 100   unihash_info u;
 101   int i, j, k;
 102
 103 #define f_bogus 1u
 104 #define f_ctab 2u
 105 #define f_const 4u
 106
 107   ego(argv[0]);
 108
 109   for (;;) {
 110     static struct option opts[] = {
 111       { "help",         0,              0,      'h' },
 112       { "version",      0,              0,      'v' },
 113       { "usage",        0,              0,      'u' },
 114
 115       { "output",       OPTF_ARGREQ,    0,      'o' },
 116       { "c-source",     0,              0,      'c' },
 117       { "const",        0,              0,      'C' },
 118       { "key",          OPTF_ARGREQ,    0,      'k' },
 119       { "symbol",       OPTF_ARGREQ,    0,      's' },
 120       { "include",      OPTF_ARGREQ,    0,      'i' },
 121       { "guard",        OPTF_ARGREQ,    0,      'g' },
 122
 123       { 0,              0,              0,      0 }
 124     };
 125     int i = mdwopt(argc, argv, "hvu o:cCk:s:i:g:", opts, 0, 0, 0);
 126
 127     if (i < 0)
 128       break;
 129     switch (i) {
 130       case 'h':
 131         help(stdout);
 132         exit(0);
 133       case 'v':
 134         version(stdout);
 135         exit(0);
 136       case 'u':
 137         usage(stdout);
 138         exit(0);
 139
 140       case 'o':
 141         file = optarg;
 142         break;
 143       case 'c':
 144         flags |= f_ctab;
 145         break;
 146       case 'C':
 147         flags |= f_const;
 148         break;
 149       case 's':
 150         sym = optarg;
 151         break;
 152       case 'i':
 153         inc = optarg;
 154         break;
 155       case 'g':
 156         guard = optarg;
 157         break;
 158       case 'k':
 159         key = getint(optarg, 0xffffffff, "key");
 160         break;
 161
 162       default:
 163         flags |= f_bogus;
 164         break;
 165     }
 166   }
 167   if ((flags & f_bogus) || optind != argc) {
 168     usage(stderr);
 169     exit(EXIT_FAILURE);
 170   }
 171
 172   /* --- Sort stuff out --- */
 173
 174   unihash_setkey(&u, key);
 175   if (!sym)
 176     sym = (flags & f_ctab) ? "uhi" : "UHI_INIT";
 177
 178   /* --- Start output --- */
 179
 180   if (!file)
 181     fp = stdout;
 182   else {
 183     if (!(flags & f_ctab) && !guard) {
 184       char *p;
 185       const char *q;
 186       if ((p = malloc(strlen(file) + 1)) == 0)
 187         die(EXIT_FAILURE, "not enough memory");
 188       guard = p;
 189       for (q = file; *q; p++, q++) {
 190         if (isalnum((unsigned char)*q))
 191           *p = toupper((unsigned char)*q);
 192         else
 193           *p = '_';
 194       }
 195       *p++ = 0;
 196     }
 197     if ((fp = fopen(file, "w")) == 0)
 198       die(EXIT_FAILURE, "couldn't write `%s': %s", file, strerror(errno));
 199   }
 200
 201   /* --- Dump out the first chunk of the file --- */
 202
 203   fprintf(fp, "\
 204 /* -*-c-*-\n\
 205  *\n\
 206  * Unihash table (key = %08lx) [generated]\n\
 207  */\n\
 208 \n",
 209           (unsigned long)key);
 210
 211   if (flags & f_ctab) {
 212     if (inc)
 213       fprintf(fp, "#include \"%s\"\n\n", inc);
 214     else
 215       fputs("#include <mLib/unihash.h>\n\n", fp);
 216     fprintf(fp, "%sunihash_info %s = { {\n",
 217             (flags&f_const) ? "const " : "", sym);
 218   } else {
 219     int n;
 220     if (guard)
 221       fprintf(fp, "#ifndef %s\n#define %s\n\n", guard, guard);
 222     n = fprintf(fp, "#define %s { {", sym);
 223     while (n < BSCOL) {
 224       fputc('\t', fp);
 225       n = (n + 8) & ~7;
 226     }
 227     fputc('\n', fp);
 228   }
 229
 230   /* --- Main output --- */
 231
 232   for (i = 0; i < N(u.s); i++) {
 233     fputs("  {", fp);
 234     for (j = 0; j < N(u.s[i]); j++) {
 235       fputs(" {", fp);
 236       for (k = 0; k < N(u.s[i][j]); k++) {
 237         fprintf(fp, " 0x%08lx", (unsigned long)u.s[i][j][k]);
 238         if (k < N(u.s[i][j]) - 1) {
 239           fputc(',', fp);
 240           if (k % 4 == 3)
 241             fputs(flags & f_ctab ? "\n     " : "\t\t\t\\\n     ", fp);
 242         }
 243       }
 244       if (j < N(u.s[i]) - 1) {
 245         fputs(flags & f_ctab ? " },\n\n   " :
 246                 " },\t\t\t\\\n\t\t\t\t\t\t\t\t\t\\\n   ", fp);
 247       }
 248     }
 249     if (i < N(u.s) - 1) {
 250       fputs(flags & f_ctab ? " } },\n\n" :
 251             " } },\t\t\\\n\t\t\t\t\t\t\t\t\t\\\n", fp);
 252     }
 253   }
 254
 255   /* --- Done --- */
 256
 257   fputs(flags & f_ctab ? " } }\n} };\n" :
 258         " } }\t\t\\\n} }\n", fp);
 259   if (!(flags & f_ctab) && guard)
 260     fputs("\n#endif\n", fp);
 261
 262   return (0);
 263 }
 264
 265 /*----- That's all, folks -------------------------------------------------*/