Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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ansi2knr.c
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1 /* ansi2knr.c */
2 /* Convert ANSI C function definitions to K&R ("traditional C") syntax */
3 
4 /*
5 ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
6 WARRANTY. No author or distributor accepts responsibility to anyone for the
7 consequences of using it or for whether it serves any particular purpose or
8 works at all, unless he says so in writing. Refer to the GNU General Public
9 License (the "GPL") for full details.
10 
11 Everyone is granted permission to copy, modify and redistribute ansi2knr,
12 but only under the conditions described in the GPL. A copy of this license
13 is supposed to have been given to you along with ansi2knr so you can know
14 your rights and responsibilities. It should be in a file named COPYLEFT.
15 [In the IJG distribution, the GPL appears below, not in a separate file.]
16 Among other things, the copyright notice and this notice must be preserved
17 on all copies.
18 
19 We explicitly state here what we believe is already implied by the GPL: if
20 the ansi2knr program is distributed as a separate set of sources and a
21 separate executable file which are aggregated on a storage medium together
22 with another program, this in itself does not bring the other program under
23 the GPL, nor does the mere fact that such a program or the procedures for
24 constructing it invoke the ansi2knr executable bring any other part of the
25 program under the GPL.
26 */
27 
28 /*
29 ---------- Here is the GNU GPL file COPYLEFT, referred to above ----------
30 ----- These terms do NOT apply to the JPEG software itself; see README ------
31 
32  GHOSTSCRIPT GENERAL PUBLIC LICENSE
33  (Clarified 11 Feb 1988)
34 
35  Copyright (C) 1988 Richard M. Stallman
36  Everyone is permitted to copy and distribute verbatim copies of this
37  license, but changing it is not allowed. You can also use this wording
38  to make the terms for other programs.
39 
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42 intended to give everyone the right to share Ghostscript. To make sure
43 that you get the rights we want you to have, we need to make
44 restrictions that forbid anyone to deny you these rights or to ask you
45 to surrender the rights. Hence this license agreement.
46 
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49 it if you want it, that you can change Ghostscript or use pieces of it
50 in new free programs, and that you know you can do these things.
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54 copies of Ghostscript, you must give the recipients all the rights that
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56 source code. And you must tell them their rights.
57 
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59 out that there is no warranty for Ghostscript. If Ghostscript is
60 modified by someone else and passed on, we want its recipients to know
61 that what they have is not what we distributed, so that any problems
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63 
64  Therefore we (Richard M. Stallman and the Free Software Foundation,
65 Inc.) make the following terms which say what you must do to be allowed
66 to distribute or change Ghostscript.
67 
68 
69  COPYING POLICIES
70 
71  1. You may copy and distribute verbatim copies of Ghostscript source
72 code as you receive it, in any medium, provided that you conspicuously
73 and appropriately publish on each copy a valid copyright and license
74 notice "Copyright (C) 1989 Aladdin Enterprises. All rights reserved.
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76 appropriate); keep intact the notices on all files that refer to this
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79 along with the program. You may charge a distribution fee for the
80 physical act of transferring a copy.
81 
82  2. You may modify your copy or copies of Ghostscript or any portion of
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84 Paragraph 1 above, provided that you also do the following:
85 
86  a) cause the modified files to carry prominent notices stating
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88 
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91  or any part thereof, to be licensed at no charge to all third
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95 
96  c) You may charge a distribution fee for the physical act of
97  transferring a copy, and you may at your option offer warranty
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99 
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125 all modules it contains; but, as a special exception, it need not include
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147 software are welcome! Please contact the Free Software Foundation,
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149 
150  NO WARRANTY
151 
152  BECAUSE GHOSTSCRIPT IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
153 NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT
154 WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC, RICHARD
155 M. STALLMAN, ALADDIN ENTERPRISES, L. PETER DEUTSCH, AND/OR OTHER PARTIES
156 PROVIDE GHOSTSCRIPT "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
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162 
163  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.
164 STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., L. PETER DEUTSCH, ALADDIN
165 ENTERPRISES, AND/OR ANY OTHER PARTY WHO MAY MODIFY AND REDISTRIBUTE
166 GHOSTSCRIPT AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING
167 ANY LOST PROFITS, LOST MONIES, OR OTHER SPECIAL, INCIDENTAL OR
168 CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
169 (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
170 INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR A FAILURE OF THE
171 PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) GHOSTSCRIPT, EVEN IF YOU
172 HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM
173 BY ANY OTHER PARTY.
174 
175 -------------------- End of file COPYLEFT ------------------------------
176 */
177 
178 /*
179  * Usage:
180  ansi2knr input_file [output_file]
181  * If no output_file is supplied, output goes to stdout.
182  * There are no error messages.
183  *
184  * ansi2knr recognizes function definitions by seeing a non-keyword
185  * identifier at the left margin, followed by a left parenthesis,
186  * with a right parenthesis as the last character on the line,
187  * and with a left brace as the first token on the following line
188  * (ignoring possible intervening comments).
189  * It will recognize a multi-line header provided that no intervening
190  * line ends with a left or right brace or a semicolon.
191  * These algorithms ignore whitespace and comments, except that
192  * the function name must be the first thing on the line.
193  * The following constructs will confuse it:
194  * - Any other construct that starts at the left margin and
195  * follows the above syntax (such as a macro or function call).
196  * - Some macros that tinker with the syntax of the function header.
197  */
198 
199 /*
200  * The original and principal author of ansi2knr is L. Peter Deutsch
201  * <ghost@aladdin.com>. Other authors are noted in the change history
202  * that follows (in reverse chronological order):
203  lpd 96-01-21 added code to cope with not HAVE_CONFIG_H and with
204  compilers that don't understand void, as suggested by
205  Tom Lane
206  lpd 96-01-15 changed to require that the first non-comment token
207  on the line following a function header be a left brace,
208  to reduce sensitivity to macros, as suggested by Tom Lane
209  <tgl@sss.pgh.pa.us>
210  lpd 95-06-22 removed #ifndefs whose sole purpose was to define
211  undefined preprocessor symbols as 0; changed all #ifdefs
212  for configuration symbols to #ifs
213  lpd 95-04-05 changed copyright notice to make it clear that
214  including ansi2knr in a program does not bring the entire
215  program under the GPL
216  lpd 94-12-18 added conditionals for systems where ctype macros
217  don't handle 8-bit characters properly, suggested by
218  Francois Pinard <pinard@iro.umontreal.ca>;
219  removed --varargs switch (this is now the default)
220  lpd 94-10-10 removed CONFIG_BROKETS conditional
221  lpd 94-07-16 added some conditionals to help GNU `configure',
222  suggested by Francois Pinard <pinard@iro.umontreal.ca>;
223  properly erase prototype args in function parameters,
224  contributed by Jim Avera <jima@netcom.com>;
225  correct error in writeblanks (it shouldn't erase EOLs)
226  lpd 89-xx-xx original version
227  */
228 
229 /* Most of the conditionals here are to make ansi2knr work with */
230 /* or without the GNU configure machinery. */
231 
232 #if HAVE_CONFIG_H
233 # include <config.h>
234 #endif
235 
236 #include <stdio.h>
237 #include <ctype.h>
238 
239 #if HAVE_CONFIG_H
240 
241 /*
242  For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).
243  This will define HAVE_CONFIG_H and so, activate the following lines.
244  */
245 
246 # if STDC_HEADERS || HAVE_STRING_H
247 # include <string.h>
248 # else
249 # include <strings.h>
250 # endif
251 
252 #else /* not HAVE_CONFIG_H */
253 
254 /* Otherwise do it the hard way */
255 
256 # ifdef BSD
257 # include <strings.h>
258 # else
259 # ifdef VMS
260  extern int strlen(), strncmp();
261 # else
262 # include <string.h>
263 # endif
264 # endif
265 
266 #endif /* not HAVE_CONFIG_H */
267 
268 #if STDC_HEADERS
269 # include <stdlib.h>
270 #else
271 /*
272  malloc and free should be declared in stdlib.h,
273  but if you've got a K&R compiler, they probably aren't.
274  */
275 # ifdef MSDOS
276 # include <malloc.h>
277 # else
278 # ifdef VMS
279  extern char *malloc();
280  extern void free();
281 # else
282  extern char *malloc();
283  extern int free();
284 # endif
285 # endif
286 
287 #endif
288 
289 /*
290  * The ctype macros don't always handle 8-bit characters correctly.
291  * Compensate for this here.
292  */
293 #ifdef isascii
294 # undef HAVE_ISASCII /* just in case */
295 # define HAVE_ISASCII 1
296 #else
297 #endif
298 #if STDC_HEADERS || !HAVE_ISASCII
299 # define is_ascii(c) 1
300 #else
301 # define is_ascii(c) isascii(c)
302 #endif
303 
304 #define is_space(c) (is_ascii(c) && isspace(c))
305 #define is_alpha(c) (is_ascii(c) && isalpha(c))
306 #define is_alnum(c) (is_ascii(c) && isalnum(c))
307 
308 /* Scanning macros */
309 #define isidchar(ch) (is_alnum(ch) || (ch) == '_')
310 #define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')
311 
312 /* Forward references */
313 char *skipspace();
314 int writeblanks();
315 int test1();
316 int convert1();
317 
318 /* The main program */
319 int
320 main(argc, argv)
321  int argc;
322  char *argv[];
323 { FILE *in, *out;
324 #define bufsize 5000 /* arbitrary size */
325  char *buf;
326  char *line;
327  char *more;
328  /*
329  * In previous versions, ansi2knr recognized a --varargs switch.
330  * If this switch was supplied, ansi2knr would attempt to convert
331  * a ... argument to va_alist and va_dcl; if this switch was not
332  * supplied, ansi2knr would simply drop any such arguments.
333  * Now, ansi2knr always does this conversion, and we only
334  * check for this switch for backward compatibility.
335  */
336  int convert_varargs = 1;
337 
338  if ( argc > 1 && argv[1][0] == '-' )
339  { if ( !strcmp(argv[1], "--varargs") )
340  { convert_varargs = 1;
341  argc--;
342  argv++;
343  }
344  else
345  { fprintf(stderr, "Unrecognized switch: %s\n", argv[1]);
346  exit(1);
347  }
348  }
349  switch ( argc )
350  {
351  default:
352  printf("Usage: ansi2knr input_file [output_file]\n");
353  exit(0);
354  case 2:
355  out = stdout;
356  break;
357  case 3:
358  out = fopen(argv[2], "w");
359  if ( out == NULL )
360  { fprintf(stderr, "Cannot open output file %s\n", argv[2]);
361  exit(1);
362  }
363  }
364  in = fopen(argv[1], "r");
365  if ( in == NULL )
366  { fprintf(stderr, "Cannot open input file %s\n", argv[1]);
367  exit(1);
368  }
369  fprintf(out, "#line 1 \"%s\"\n", argv[1]);
370  buf = malloc(bufsize);
371  line = buf;
372  while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
373  {
374 test: line += strlen(line);
375  switch ( test1(buf) )
376  {
377  case 2: /* a function header */
378  convert1(buf, out, 1, convert_varargs);
379  break;
380  case 1: /* a function */
381  /* Check for a { at the start of the next line. */
382  more = ++line;
383 f: if ( line >= buf + (bufsize - 1) ) /* overflow check */
384  goto wl;
385  if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )
386  goto wl;
387  switch ( *skipspace(more, 1) )
388  {
389  case '{':
390  /* Definitely a function header. */
391  convert1(buf, out, 0, convert_varargs);
392  fputs(more, out);
393  break;
394  case 0:
395  /* The next line was blank or a comment: */
396  /* keep scanning for a non-comment. */
397  line += strlen(line);
398  goto f;
399  default:
400  /* buf isn't a function header, but */
401  /* more might be. */
402  fputs(buf, out);
403  strcpy(buf, more);
404  line = buf;
405  goto test;
406  }
407  break;
408  case -1: /* maybe the start of a function */
409  if ( line != buf + (bufsize - 1) ) /* overflow check */
410  continue;
411  /* falls through */
412  default: /* not a function */
413 wl: fputs(buf, out);
414  break;
415  }
416  line = buf;
417  }
418  if ( line != buf )
419  fputs(buf, out);
420  free(buf);
421  fclose(out);
422  fclose(in);
423  return 0;
424 }
425 
426 /* Skip over space and comments, in either direction. */
427 char *
429  register char *p;
430  register int dir; /* 1 for forward, -1 for backward */
431 { for ( ; ; )
432  { while ( is_space(*p) )
433  p += dir;
434  if ( !(*p == '/' && p[dir] == '*') )
435  break;
436  p += dir; p += dir;
437  while ( !(*p == '*' && p[dir] == '/') )
438  { if ( *p == 0 )
439  return p; /* multi-line comment?? */
440  p += dir;
441  }
442  p += dir; p += dir;
443  }
444  return p;
445 }
446 
447 /*
448  * Write blanks over part of a string.
449  * Don't overwrite end-of-line characters.
450  */
451 int
453  char *start;
454  char *end;
455 { char *p;
456  for ( p = start; p < end; p++ )
457  if ( *p != '\r' && *p != '\n' )
458  *p = ' ';
459  return 0;
460 }
461 
462 /*
463  * Test whether the string in buf is a function definition.
464  * The string may contain and/or end with a newline.
465  * Return as follows:
466  * 0 - definitely not a function definition;
467  * 1 - definitely a function definition;
468  * 2 - definitely a function prototype (NOT USED);
469  * -1 - may be the beginning of a function definition,
470  * append another line and look again.
471  * The reason we don't attempt to convert function prototypes is that
472  * Ghostscript's declaration-generating macros look too much like
473  * prototypes, and confuse the algorithms.
474  */
475 int
477  char *buf;
478 { register char *p = buf;
479  char *bend;
480  char *endfn;
481  int contin;
482 
483  if ( !isidfirstchar(*p) )
484  return 0; /* no name at left margin */
485  bend = skipspace(buf + strlen(buf) - 1, -1);
486  switch ( *bend )
487  {
488  case ';': contin = 0 /*2*/; break;
489  case ')': contin = 1; break;
490  case '{': return 0; /* not a function */
491  case '}': return 0; /* not a function */
492  default: contin = -1;
493  }
494  while ( isidchar(*p) )
495  p++;
496  endfn = p;
497  p = skipspace(p, 1);
498  if ( *p++ != '(' )
499  return 0; /* not a function */
500  p = skipspace(p, 1);
501  if ( *p == ')' )
502  return 0; /* no parameters */
503  /* Check that the apparent function name isn't a keyword. */
504  /* We only need to check for keywords that could be followed */
505  /* by a left parenthesis (which, unfortunately, is most of them). */
506  { static char *words[] =
507  { "asm", "auto", "case", "char", "const", "double",
508  "extern", "float", "for", "if", "int", "long",
509  "register", "return", "short", "signed", "sizeof",
510  "static", "switch", "typedef", "unsigned",
511  "void", "volatile", "while", 0
512  };
513  char **key = words;
514  char *kp;
515  int len = endfn - buf;
516 
517  while ( (kp = *key) != 0 )
518  { if ( strlen(kp) == len && !strncmp(kp, buf, len) )
519  return 0; /* name is a keyword */
520  key++;
521  }
522  }
523  return contin;
524 }
525 
526 /* Convert a recognized function definition or header to K&R syntax. */
527 int
528 convert1(buf, out, header, convert_varargs)
529  char *buf;
530  FILE *out;
531  int header; /* Boolean */
532  int convert_varargs; /* Boolean */
533 { char *endfn;
534  register char *p;
535  char **breaks;
536  unsigned num_breaks = 2; /* for testing */
537  char **btop;
538  char **bp;
539  char **ap;
540  char *vararg = 0;
541 
542  /* Pre-ANSI implementations don't agree on whether strchr */
543  /* is called strchr or index, so we open-code it here. */
544  for ( endfn = buf; *(endfn++) != '('; )
545  ;
546 top: p = endfn;
547  breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
548  if ( breaks == 0 )
549  { /* Couldn't allocate break table, give up */
550  fprintf(stderr, "Unable to allocate break table!\n");
551  fputs(buf, out);
552  return -1;
553  }
554  btop = breaks + num_breaks * 2 - 2;
555  bp = breaks;
556  /* Parse the argument list */
557  do
558  { int level = 0;
559  char *lp = NULL;
560  char *rp;
561  char *end = NULL;
562 
563  if ( bp >= btop )
564  { /* Filled up break table. */
565  /* Allocate a bigger one and start over. */
566  free((char *)breaks);
567  num_breaks <<= 1;
568  goto top;
569  }
570  *bp++ = p;
571  /* Find the end of the argument */
572  for ( ; end == NULL; p++ )
573  { switch(*p)
574  {
575  case ',':
576  if ( !level ) end = p;
577  break;
578  case '(':
579  if ( !level ) lp = p;
580  level++;
581  break;
582  case ')':
583  if ( --level < 0 ) end = p;
584  else rp = p;
585  break;
586  case '/':
587  p = skipspace(p, 1) - 1;
588  break;
589  default:
590  ;
591  }
592  }
593  /* Erase any embedded prototype parameters. */
594  if ( lp )
595  writeblanks(lp + 1, rp);
596  p--; /* back up over terminator */
597  /* Find the name being declared. */
598  /* This is complicated because of procedure and */
599  /* array modifiers. */
600  for ( ; ; )
601  { p = skipspace(p - 1, -1);
602  switch ( *p )
603  {
604  case ']': /* skip array dimension(s) */
605  case ')': /* skip procedure args OR name */
606  { int level = 1;
607  while ( level )
608  switch ( *--p )
609  {
610  case ']': case ')': level++; break;
611  case '[': case '(': level--; break;
612  case '/': p = skipspace(p, -1) + 1; break;
613  default: ;
614  }
615  }
616  if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
617  { /* We found the name being declared */
618  while ( !isidfirstchar(*p) )
619  p = skipspace(p, 1) + 1;
620  goto found;
621  }
622  break;
623  default:
624  goto found;
625  }
626  }
627 found: if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
628  { if ( convert_varargs )
629  { *bp++ = "va_alist";
630  vararg = p-2;
631  }
632  else
633  { p++;
634  if ( bp == breaks + 1 ) /* sole argument */
635  writeblanks(breaks[0], p);
636  else
637  writeblanks(bp[-1] - 1, p);
638  bp--;
639  }
640  }
641  else
642  { while ( isidchar(*p) ) p--;
643  *bp++ = p+1;
644  }
645  p = end;
646  }
647  while ( *p++ == ',' );
648  *bp = p;
649  /* Make a special check for 'void' arglist */
650  if ( bp == breaks+2 )
651  { p = skipspace(breaks[0], 1);
652  if ( !strncmp(p, "void", 4) )
653  { p = skipspace(p+4, 1);
654  if ( p == breaks[2] - 1 )
655  { bp = breaks; /* yup, pretend arglist is empty */
656  writeblanks(breaks[0], p + 1);
657  }
658  }
659  }
660  /* Put out the function name and left parenthesis. */
661  p = buf;
662  while ( p != endfn ) putc(*p, out), p++;
663  /* Put out the declaration. */
664  if ( header )
665  { fputs(");", out);
666  for ( p = breaks[0]; *p; p++ )
667  if ( *p == '\r' || *p == '\n' )
668  putc(*p, out);
669  }
670  else
671  { for ( ap = breaks+1; ap < bp; ap += 2 )
672  { p = *ap;
673  while ( isidchar(*p) )
674  putc(*p, out), p++;
675  if ( ap < bp - 1 )
676  fputs(", ", out);
677  }
678  fputs(") ", out);
679  /* Put out the argument declarations */
680  for ( ap = breaks+2; ap <= bp; ap += 2 )
681  (*ap)[-1] = ';';
682  if ( vararg != 0 )
683  { *vararg = 0;
684  fputs(breaks[0], out); /* any prior args */
685  fputs("va_dcl", out); /* the final arg */
686  fputs(bp[0], out);
687  }
688  else
689  fputs(breaks[0], out);
690  }
691  free((char *)breaks);
692  return 0;
693 }
GLenum GLuint GLsizei bufsize
int test1()
GLfloat GLfloat p
#define NULL
Definition: ftobjs.h:61
char * malloc()
GLuint start
char * skipspace()
int main(int argc, argv)
Definition: ansi2knr.c:320
GLenum GLuint GLenum GLsizei const GLchar * buf
int writeblanks()
GLenum GLsizei len
#define isidchar(ch)
Definition: ansi2knr.c:309
GLint level
local int out(void *out_desc, unsigned char *buf, unsigned len)
Definition: gun.c:131
int free()
GLuint GLuint end
GLdouble GLdouble GLdouble GLdouble top
GLuint in
#define isidfirstchar(ch)
Definition: ansi2knr.c:310
#define is_space(c)
Definition: ansi2knr.c:304
GLfloat f
int convert1()