mdw@git.distorted.org.uk Git - quine/blob - qqlib.c

   1 /* -*-c-*-
   2  *
   3  * $Id: qqlib.c,v 1.2 2000/08/01 17:41:39 mdw Exp $
   4  *
   5  * Useful library of tools for quines
   6  *
   7  * (c) 1999 Mark Wooding
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Quine
  13  *
  14  * Quine is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * Quine 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 General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with Quine; if not, write to the Free Software Foundation,
  26  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  * However, when this source text is embedded in a file by the Quine
  29  * program, you may do anything you like with the resulting text;
  30  * distribution and modification are not limited by the General Public
  31  * License.
  32  */
  33
  34 /*----- Revision history --------------------------------------------------*
  35  *
  36  * $Log: qqlib.c,v $
  37  * Revision 1.2  2000/08/01 17:41:39  mdw
  38  * Remove unnecessary <ctype.h> header.
  39  *
  40  * Revision 1.1.1.1  1999/04/28 19:58:07  mdw
  41  * Initial revision
  42  *
  43  */
  44
  45 /*----- Header files ------------------------------------------------------*/
  46
  47 /* --- ANSI headers --- */
  48
  49 #include <errno.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53
  54 /* --- POSIX headers --- */
  55
  56 #ifndef QUINE_PORTABLE
  57 #  include <sys/types.h>
  58 #  include <sys/fcntl.h>
  59 #  include <sys/stat.h>
  60 #  include <unistd.h>
  61 #endif
  62
  63 /* --- Local headers --- */
  64
  65 #include "quine.h"
  66
  67 /*----- Macro hacking -----------------------------------------------------*/
  68
  69 #ifdef QUINE_PORTABLE
  70 #  define PORT(x) x
  71 #  define NPORT(x)
  72 #else
  73 #  define PORT(x)
  74 #  define NPORT(x) x
  75 #endif
  76
  77 /*----- Main code ---------------------------------------------------------*/
  78
  79 /* --- @qq_xlate@ --- *
  80  *
  81  * Arguments:   @FILE *fp@ = output file handle
  82  *              @const char *p@ = pointer to encoded text
  83  *
  84  * Returns:     ---
  85  *
  86  * Use:         Writes the decoded string to the given file handle.
  87  */
  88
  89 void qq_xlate(FILE *fp, const char *p)
  90 {
  91   while (*p) {
  92     if (*p == '%') {
  93       p++;
  94       switch (*p) {
  95         case 'q': fputc('\"', fp); break;
  96         case 'b': fputc('\\', fp); break;
  97         case 't': fputc('\t', fp); break;
  98         case 'n': fputc('\n', fp); break;
  99         case 'a': fputc('\a', fp); break;
 100         case 'r': fputc('\r', fp); break;
 101         case '0': fputc('\0', fp); break;
 102         case '%': fputc('%', fp);  break;
 103         case 'x': {
 104           unsigned char ch = 0;
 105           p++;
 106           while (*p != '%') {
 107             unsigned int x = *p++;
 108             x -= '0';
 109             if (x >= 10) x -= 'a' - '0' - 10;
 110             if (x >= 16) x -= 'A' - 'a';
 111             ch = (ch << 4) + x;
 112           }
 113           fputc(ch, fp);
 114         } break;
 115         default:
 116           p--;
 117           break;
 118       }
 119     } else
 120       fputc(*p, fp);
 121     p++;
 122   }
 123 }
 124
 125 /* --- @qq_file@ --- *
 126  *
 127  * Arguments:   @FILE *fp@ = output file handle
 128  *              @const char **p@ = pointer to the output array
 129  *
 130  * Returns:     ---
 131  *
 132  * Use:         Writes the contents of a file to the output.
 133  */
 134
 135 void qq_file(FILE *fp, const char **p)
 136 {
 137   while (*p)
 138     qq_xlate(fp, *p++);
 139 }
 140
 141 /* --- @qq_head@ --- *
 142  *
 143  * Arguments:   @FILE *fp@ = output file handle
 144  *
 145  * Returns:     ---
 146  *
 147  * Use:         Writes the head of a `qqout.c' file.
 148  */
 149
 150 void qq_head(FILE *fp)
 151 {
 152   fputs("/* quine output file */\n\n", fp);
 153 }
 154
 155 /* --- @qq_body@ --- *
 156  *
 157  * Arguments:   @FILE *fp@ = output file handle
 158  *              @const char ***p@ = pointer to main table
 159  *
 160  * Returns:     ---
 161  *
 162  * Use:         Writes the body table of a `qqout.c' file.
 163  */
 164
 165 void qq_body(FILE *fp, const char ***p)
 166 {
 167   size_t fno = 0;
 168   const char **q;
 169
 170   fputs("/* --- file contents tables --- */\n\n", fp);
 171   while (*p) {
 172     q = *p;
 173     fprintf(fp, "static const char *qq__c_%lx[] = {\n", (unsigned long)fno);
 174     fprintf(fp, "/* Filename: */ \"%s\",\n", *q++);
 175     if (strncmp(*q, "%!", 2) == 0)
 176       fprintf(fp, "/* Mode: */ \"%s\",\n", *q++);
 177     while (*q)
 178       fprintf(fp, "\"%s\",\n", *q++);
 179     fputs("0\n};\n\n", fp);
 180     p++;
 181     fno++;
 182   }
 183 }
 184
 185 /* --- @qq_tail@ --- *
 186  *
 187  * Arguments:   @FILE *fp@ = output file handle
 188  *              @const char **qql@ = pointer to qqlib file array
 189  *              @size_t fno@ = number of files written
 190  *              @const char *fn@ = name of `qqout.c' file
 191  *
 192  * Returns:     ---
 193  *
 194  * Use:         Writes the head of a `qqout.c' file.
 195  */
 196
 197 void qq_tail(FILE *fp, const char **qql, size_t fno, const char *fn)
 198 {
 199   const char **p;
 200   size_t i;
 201
 202   /* --- Write out the qqlib array --- */
 203
 204   fputs("/* --- qqlib code --- */\n\n"
 205         "const char *qq_qqlib[] = {\n", fp);
 206   for (p = qql; *p; p++)
 207     fprintf(fp, "\"%s\",\n", *p);
 208   fputs("0\n};\n\n", fp);
 209
 210   /* --- Build the main array --- */
 211
 212   fputs("/* --- table of files to output --- */\n\n"
 213         "const char **qq_table[] = {\n", fp);
 214   for (i = 0; i < fno; i++)
 215     fprintf(fp, "  qq__c_%lx,\n", (unsigned long)i);
 216   fputs("  0\n};\n\n", fp);
 217
 218   /* --- Now output the qqlib code --- */
 219
 220   fputs("#define QQ_OUT\n\n", fp);
 221   qq_file(fp, qql);
 222
 223   /* --- Finally write the code to write everything out --- */
 224
 225   fprintf(fp,
 226           "/* --- quine output routines --- */\n\n"
 227           "void qq_dump(FILE *fp) {\n"
 228           "  qq__dump(fp, qq_table, qq_qqlib, \"%s\", %lu);\n"
 229           "}\n"
 230           "int qq_create(void) {\n"
 231           "  return (qq__create(qq_table, qq_qqlib, \"%s\", %lu));\n"
 232           "}\n\n",
 233           fn, (unsigned long)fno, fn, (unsigned long)fno);
 234 }
 235
 236 /* --- @qq_mkfile@ --- *
 237  *
 238  * Arguments:   @const char *fn@ = pointer to a filename
 239  *              @int mode@ = file mode to use (only in Unix-specific version)
 240  *
 241  * Returns:     A handle for the created file.
 242  *
 243  * Use:         Creates a file, and leading directories and stuff.
 244  */
 245
 246 #ifdef QUINE_PORTABLE
 247 FILE *qq_mkfile(const char *fn)
 248 {
 249   return (fopen(fn, "w"));
 250 }
 251 #else
 252 FILE *qq_mkfile(const char *fn, int mode)
 253 {
 254   char buf[FILENAME_MAX];
 255   char *p;
 256   int fd;
 257
 258   strcpy(buf, fn);
 259   p = strchr(buf, '/');
 260   for (;;) {
 261     if (!p)
 262       break;
 263     *p = 0;
 264     mkdir(buf, 0777);
 265     *p = '/';
 266     p = strchr(p + 1, '/');
 267   }
 268
 269   fd = open(fn, O_WRONLY|O_CREAT|O_TRUNC, mode);
 270   return (fd >=0 ? fdopen(fd, "w") : 0);
 271 }
 272 #endif
 273
 274 #ifdef QQ_OUT
 275
 276 /* --- @qq__dump@ --- *
 277  *
 278  * Arguments:   @FILE *fp@ = file to dump on
 279  *              @const char ***p@ = pointer to main table
 280  *              @const char **qql@ = pointer to qqlib code
 281  *              @const char *fn@ = name of `qqout.c' file
 282  *              @size_t fno@ = number of files to be output
 283  *
 284  * Returns:     ---
 285  *
 286  * Use:         Outputs the entire source code to a given file.
 287  */
 288
 289 static void qq__dump(FILE *fp, const char ***p, const char **qql,
 290                      const char *fn, size_t fno)
 291 {
 292   const char ***q = p;
 293
 294   while (*q) {
 295     fprintf(fp, "******** %s\n\n", **q);
 296     qq_file(fp, *q + 1);
 297     q++;
 298   }
 299   fprintf(fp, "******** %s\n\n", fn);
 300   qq_head(fp);
 301   qq_body(fp, p);
 302   qq_tail(fp, qql, fno, fn);
 303 }
 304
 305 /* --- @qq__create@ --- *
 306  *
 307  * Arguments:   @const char ***p@ = pointer to main table
 308  *              @const char **qql@ = pointer to qqlib code
 309  *              @const char *fn@ = name of `qqout.c' file
 310  *              @size_t fno@ = number of files to be output
 311  *
 312  * Returns:     Zero if all went well, else nonzero.
 313  *
 314  * Use:         Rebuilds the original source distribution.
 315  */
 316
 317 static int qq__create(const char ***p, const char **qql,
 318                       const char *fn, size_t fno)
 319 {
 320   FILE *fp;
 321   const char ***q = p;
 322
 323   while (*q) {
 324     const char **qq = *q + 1;
 325
 326 #ifdef QUINE_PORTABLE
 327     if (strncmp(*qq, "%!", 2) == 0)
 328       qq++;
 329     fp = qq_mkfile(*qq);
 330 #else
 331     if (strncmp(*qq, "%!", 2) == 0) {
 332       fp = qq_mkfile(**q, (int)strtol(*qq + 2, 0, 8));
 333       qq++;
 334     } else
 335       fp = qq_mkfile(**q, 0666);
 336 #endif
 337
 338     if (!fp)
 339       return (-1);
 340     qq_file(fp, qq);
 341     if (fclose(fp))
 342       return (-1);
 343     q++;
 344   }
 345   fp = qq_mkfile(fn, 0666);
 346   if (!fp)
 347     return (-1);
 348   qq_head(fp);
 349   qq_body(fp, p);
 350   qq_tail(fp, qql, fno, fn);
 351   if (fclose(fp))
 352     return (-1);
 353   return (0);
 354 }
 355
 356 #endif
 357
 358 /*----- That's all, folks -------------------------------------------------*/