1/* ansi2knr.c */
2
3/* Convert ANSI C function definitions to K&R ("traditional C") syntax
4Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
5Copyright (C) 1988 Richard M. Stallman
6
7ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
8WARRANTY.  No author or distributor accepts responsibility to anyone for the
9consequences of using it or for whether it serves any particular purpose or
10works at all, unless he says so in writing.  Refer to the GNU General Public
11License (the "GPL") for full details.
12
13Everyone is granted permission to copy, modify and redistribute ansi2knr,
14but only under the conditions described in the GPL.  A copy of this license
15is supposed to have been given to you along with ansi2knr so you can know
16your rights and responsibilities.  It should be in a file named COPYLEFT.
17[In the LIBPNG distribution, the GPL appears below, not in a separate file.]
18Among other things, the copyright notice and this notice must be preserved
19on all copies.
20
21We explicitly state here what we believe is already implied by the GPL: if
22the ansi2knr program is distributed as a separate source file and a
23separate executable file which are aggregated on a storage medium together
24with another program, this in itself does not bring the other program under
25the GPL, nor does the mere fact that such a program or the procedures for
26constructing it invoke the ansi2knr executable bring any other part of the
27program under the GPL.
28*/
29
30/*
31---------- Here is the GNU GPL file COPYLEFT, referred to above ----------
32----- These terms do NOT apply to the LIBPNG software itself; see README ------
33
34		    GHOSTSCRIPT GENERAL PUBLIC LICENSE
35		    (Clarified 11 Feb 1988)
36
37 Copyright (C) 1988 Richard M. Stallman
38 Everyone is permitted to copy and distribute verbatim copies of this
39 license, but changing it is not allowed.  You can also use this wording
40 to make the terms for other programs.
41
42  The license agreements of most software companies keep you at the
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47to surrender the rights.  Hence this license agreement.
48
49  Specifically, we want to make sure that you have the right to give
50away copies of Ghostscript, that you receive source code or else can get
51it if you want it, that you can change Ghostscript or use pieces of it
52in new free programs, and that you know you can do these things.
53
54  To make sure that everyone has such rights, we have to forbid you to
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56copies of Ghostscript, you must give the recipients all the rights that
57you have.  You must make sure that they, too, receive or can get the
58source code.  And you must tell them their rights.
59
60  Also, for our own protection, we must make certain that everyone finds
61out that there is no warranty for Ghostscript.  If Ghostscript is
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63that what they have is not what we distributed, so that any problems
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65
66  Therefore we (Richard M. Stallman and the Free Software Foundation,
67Inc.) make the following terms which say what you must do to be allowed
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69
70
71			COPYING POLICIES
72
73  1. You may copy and distribute verbatim copies of Ghostscript source
74code as you receive it, in any medium, provided that you conspicuously
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76notice "Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
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83
84  2. You may modify your copy or copies of Ghostscript or any portion of
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86Paragraph 1 above, provided that you also do the following:
87
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90
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97
98    c) You may charge a distribution fee for the physical act of
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100    protection in exchange for a fee.
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130
131  4. You may not copy, sublicense, distribute or transfer Ghostscript
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140  5. If you wish to incorporate parts of Ghostscript into other free
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148Your comments and suggestions about our licensing policies and our
149software are welcome!  Please contact the Free Software Foundation,
150Inc., 675 Mass Ave, Cambridge, MA 02139, or call (617) 876-3296.
151
152		       NO WARRANTY
153
154  BECAUSE GHOSTSCRIPT IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
155NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW.  EXCEPT
156WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC, RICHARD
157M. STALLMAN, ALADDIN ENTERPRISES, L. PETER DEUTSCH, AND/OR OTHER PARTIES
158PROVIDE GHOSTSCRIPT "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
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166STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., L. PETER DEUTSCH, ALADDIN
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174HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM
175BY ANY OTHER PARTY.
176
177-------------------- End of file COPYLEFT ------------------------------
178*/
179
180/*
181 * Usage:
182	ansi2knr input_file [output_file]
183 * If no output_file is supplied, output goes to stdout.
184 * There are no error messages.
185 *
186 * ansi2knr recognizes function definitions by seeing a non-keyword
187 * identifier at the left margin, followed by a left parenthesis,
188 * with a right parenthesis as the last character on the line,
189 * and with a left brace as the first token on the following line
190 * (ignoring possible intervening comments).
191 * It will recognize a multi-line header provided that no intervening
192 * line ends with a left or right brace or a semicolon.
193 * These algorithms ignore whitespace and comments, except that
194 * the function name must be the first thing on the line.
195 * The following constructs will confuse it:
196 *	- Any other construct that starts at the left margin and
197 *	    follows the above syntax (such as a macro or function call).
198 *	- Some macros that tinker with the syntax of the function header.
199 */
200
201/*
202 * The original and principal author of ansi2knr is L. Peter Deutsch
203 * <ghost@aladdin.com>.  Other authors are noted in the change history
204 * that follows (in reverse chronological order):
205	lpd 96-01-21 added code to cope with not HAVE_CONFIG_H and with
206		compilers that don't understand void, as suggested by
207		Tom Lane
208	lpd 96-01-15 changed to require that the first non-comment token
209		on the line following a function header be a left brace,
210		to reduce sensitivity to macros, as suggested by Tom Lane
211		<tgl@sss.pgh.pa.us>
212	lpd 95-06-22 removed #ifndefs whose sole purpose was to define
213		undefined preprocessor symbols as 0; changed all #ifdefs
214		for configuration symbols to #ifs
215	lpd 95-04-05 changed copyright notice to make it clear that
216		including ansi2knr in a program does not bring the entire
217		program under the GPL
218	lpd 94-12-18 added conditionals for systems where ctype macros
219		don't handle 8-bit characters properly, suggested by
220		Francois Pinard <pinard@iro.umontreal.ca>;
221		removed --varargs switch (this is now the default)
222	lpd 94-10-10 removed CONFIG_BROKETS conditional
223	lpd 94-07-16 added some conditionals to help GNU `configure',
224		suggested by Francois Pinard <pinard@iro.umontreal.ca>;
225		properly erase prototype args in function parameters,
226		contributed by Jim Avera <jima@netcom.com>;
227		correct error in writeblanks (it shouldn't erase EOLs)
228	lpd 89-xx-xx original version
229 */
230
231/* Most of the conditionals here are to make ansi2knr work with */
232/* or without the GNU configure machinery. */
233
234#if HAVE_CONFIG_H
235# include <config.h>
236#endif
237
238#include <stdio.h>
239#include <ctype.h>
240
241#if HAVE_CONFIG_H
242
243/*
244   For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).
245   This will define HAVE_CONFIG_H and so, activate the following lines.
246 */
247
248# if STDC_HEADERS || HAVE_STRING_H
249#  include <string.h>
250# else
251#  include <strings.h>
252# endif
253
254#else /* not HAVE_CONFIG_H */
255
256/* Otherwise do it the hard way */
257
258# ifdef BSD
259#  include <strings.h>
260# else
261#  ifdef VMS
262    extern int strlen(), strncmp();
263#  else
264#   include <string.h>
265#  endif
266# endif
267
268#endif /* not HAVE_CONFIG_H */
269
270#if STDC_HEADERS
271# include <stdlib.h>
272#else
273/*
274   malloc and free should be declared in stdlib.h,
275   but if you've got a K&R compiler, they probably aren't.
276 */
277# ifdef MSDOS
278#  include <malloc.h>
279# else
280#  ifdef VMS
281     extern char *malloc();
282     extern void free();
283#  else
284     extern char *malloc();
285     extern int free();
286#  endif
287# endif
288
289#endif
290
291/*
292 * The ctype macros don't always handle 8-bit characters correctly.
293 * Compensate for this here.
294 */
295#ifdef isascii
296#  undef HAVE_ISASCII		/* just in case */
297#  define HAVE_ISASCII 1
298#else
299#endif
300#if STDC_HEADERS || !HAVE_ISASCII
301#  define is_ascii(c) 1
302#else
303#  define is_ascii(c) isascii(c)
304#endif
305
306#define is_space(c) (is_ascii(c) && isspace(c))
307#define is_alpha(c) (is_ascii(c) && isalpha(c))
308#define is_alnum(c) (is_ascii(c) && isalnum(c))
309
310/* Scanning macros */
311#define isidchar(ch) (is_alnum(ch) || (ch) == '_')
312#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')
313
314/* Forward references */
315char *skipspace();
316int writeblanks();
317int test1();
318int convert1();
319
320/* The main program */
321int
322main(argc, argv)
323    int argc;
324    char *argv[];
325{	FILE *in, *out;
326#define bufsize 5000			/* arbitrary size */
327	char *buf;
328	char *line;
329	char *more;
330	/*
331	 * In previous versions, ansi2knr recognized a --varargs switch.
332	 * If this switch was supplied, ansi2knr would attempt to convert
333	 * a ... argument to va_alist and va_dcl; if this switch was not
334	 * supplied, ansi2knr would simply drop any such arguments.
335	 * Now, ansi2knr always does this conversion, and we only
336	 * check for this switch for backward compatibility.
337	 */
338	int convert_varargs = 1;
339
340	if ( argc > 1 && argv[1][0] == '-' )
341	  {	if ( !strcmp(argv[1], "--varargs") )
342		  {	convert_varargs = 1;
343			argc--;
344			argv++;
345		  }
346		else
347		  {	fprintf(stderr, "Unrecognized switch: %s\n", argv[1]);
348			exit(1);
349		  }
350	  }
351	switch ( argc )
352	   {
353	default:
354		printf("Usage: ansi2knr input_file [output_file]\n");
355		exit(0);
356	case 2:
357		out = stdout;
358		break;
359	case 3:
360		out = fopen(argv[2], "w");
361		if ( out == NULL )
362		   {	fprintf(stderr, "Cannot open output file %s\n", argv[2]);
363			exit(1);
364		   }
365	   }
366	in = fopen(argv[1], "r");
367	if ( in == NULL )
368	   {	fprintf(stderr, "Cannot open input file %s\n", argv[1]);
369		exit(1);
370	   }
371	fprintf(out, "#line 1 \"%s\"\n", argv[1]);
372	buf = malloc(bufsize);
373	line = buf;
374	while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
375	   {
376test:		line += strlen(line);
377		switch ( test1(buf) )
378		   {
379		case 2:			/* a function header */
380			convert1(buf, out, 1, convert_varargs);
381			break;
382		case 1:			/* a function */
383			/* Check for a { at the start of the next line. */
384			more = ++line;
385f:			if ( line >= buf + (bufsize - 1) ) /* overflow check */
386			  goto wl;
387			if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )
388			  goto wl;
389			switch ( *skipspace(more, 1) )
390			  {
391			  case '{':
392			    /* Definitely a function header. */
393			    convert1(buf, out, 0, convert_varargs);
394			    fputs(more, out);
395			    break;
396			  case 0:
397			    /* The next line was blank or a comment: */
398			    /* keep scanning for a non-comment. */
399			    line += strlen(line);
400			    goto f;
401			  default:
402			    /* buf isn't a function header, but */
403			    /* more might be. */
404			    fputs(buf, out);
405			    strcpy(buf, more);
406			    line = buf;
407			    goto test;
408			  }
409			break;
410		case -1:		/* maybe the start of a function */
411			if ( line != buf + (bufsize - 1) ) /* overflow check */
412			  continue;
413			/* falls through */
414		default:		/* not a function */
415wl:			fputs(buf, out);
416			break;
417		   }
418		line = buf;
419	   }
420	if ( line != buf )
421	  fputs(buf, out);
422	free(buf);
423	fclose(out);
424	fclose(in);
425	return 0;
426}
427
428/* Skip over space and comments, in either direction. */
429char *
430skipspace(p, dir)
431    register char *p;
432    register int dir;			/* 1 for forward, -1 for backward */
433{	for ( ; ; )
434	   {	while ( is_space(*p) )
435		  p += dir;
436		if ( !(*p == '/' && p[dir] == '*') )
437		  break;
438		p += dir;  p += dir;
439		while ( !(*p == '*' && p[dir] == '/') )
440		   {	if ( *p == 0 )
441			  return p;	/* multi-line comment?? */
442			p += dir;
443		   }
444		p += dir;  p += dir;
445	   }
446	return p;
447}
448
449/*
450 * Write blanks over part of a string.
451 * Don't overwrite end-of-line characters.
452 */
453int
454writeblanks(start, end)
455    char *start;
456    char *end;
457{	char *p;
458	for ( p = start; p < end; p++ )
459	  if ( *p != '\r' && *p != '\n' )
460	    *p = ' ';
461	return 0;
462}
463
464/*
465 * Test whether the string in buf is a function definition.
466 * The string may contain and/or end with a newline.
467 * Return as follows:
468 *	0 - definitely not a function definition;
469 *	1 - definitely a function definition;
470 *	2 - definitely a function prototype (NOT USED);
471 *	-1 - may be the beginning of a function definition,
472 *		append another line and look again.
473 * The reason we don't attempt to convert function prototypes is that
474 * Ghostscript's declaration-generating macros look too much like
475 * prototypes, and confuse the algorithms.
476 */
477int
478test1(buf)
479    char *buf;
480{	register char *p = buf;
481	char *bend;
482	char *endfn;
483	int contin;
484
485	if ( !isidfirstchar(*p) )
486	  return 0;		/* no name at left margin */
487	bend = skipspace(buf + strlen(buf) - 1, -1);
488	switch ( *bend )
489	   {
490	   case ';': contin = 0 /*2*/; break;
491	   case ')': contin = 1; break;
492	   case '{': return 0;		/* not a function */
493	   case '}': return 0;		/* not a function */
494	   default: contin = -1;
495	   }
496	while ( isidchar(*p) )
497	  p++;
498	endfn = p;
499	p = skipspace(p, 1);
500	if ( *p++ != '(' )
501	  return 0;		/* not a function */
502	p = skipspace(p, 1);
503	if ( *p == ')' )
504	  return 0;		/* no parameters */
505	/* Check that the apparent function name isn't a keyword. */
506	/* We only need to check for keywords that could be followed */
507	/* by a left parenthesis (which, unfortunately, is most of them). */
508	   {	static char *words[] =
509		   {	"asm", "auto", "case", "char", "const", "double",
510			"extern", "float", "for", "if", "int", "long",
511			"register", "return", "short", "signed", "sizeof",
512			"static", "switch", "typedef", "unsigned",
513			"void", "volatile", "while", 0
514		   };
515		char **key = words;
516		char *kp;
517		int len = endfn - buf;
518
519		while ( (kp = *key) != 0 )
520		   {	if ( strlen(kp) == len && !strncmp(kp, buf, len) )
521			  return 0;	/* name is a keyword */
522			key++;
523		   }
524	   }
525	return contin;
526}
527
528/* Convert a recognized function definition or header to K&R syntax. */
529int
530convert1(buf, out, header, convert_varargs)
531    char *buf;
532    FILE *out;
533    int header;			/* Boolean */
534    int convert_varargs;	/* Boolean */
535{	char *endfn;
536	register char *p;
537	char **breaks;
538	unsigned num_breaks = 2;	/* for testing */
539	char **btop;
540	char **bp;
541	char **ap;
542	char *vararg = 0;
543
544	/* Pre-ANSI implementations don't agree on whether strchr */
545	/* is called strchr or index, so we open-code it here. */
546	for ( endfn = buf; *(endfn++) != '('; )
547	  ;
548top:	p = endfn;
549	breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
550	if ( breaks == 0 )
551	   {	/* Couldn't allocate break table, give up */
552		fprintf(stderr, "Unable to allocate break table!\n");
553		fputs(buf, out);
554		return -1;
555	   }
556	btop = breaks + num_breaks * 2 - 2;
557	bp = breaks;
558	/* Parse the argument list */
559	do
560	   {	int level = 0;
561		char *lp = NULL;
562		char *rp;
563		char *end = NULL;
564
565		if ( bp >= btop )
566		   {	/* Filled up break table. */
567			/* Allocate a bigger one and start over. */
568			free((char *)breaks);
569			num_breaks <<= 1;
570			goto top;
571		   }
572		*bp++ = p;
573		/* Find the end of the argument */
574		for ( ; end == NULL; p++ )
575		   {	switch(*p)
576			   {
577			   case ',':
578				if ( !level ) end = p;
579				break;
580			   case '(':
581				if ( !level ) lp = p;
582				level++;
583				break;
584			   case ')':
585				if ( --level < 0 ) end = p;
586				else rp = p;
587				break;
588			   case '/':
589				p = skipspace(p, 1) - 1;
590				break;
591			   default:
592				;
593			   }
594		   }
595		/* Erase any embedded prototype parameters. */
596		if ( lp )
597		  writeblanks(lp + 1, rp);
598		p--;			/* back up over terminator */
599		/* Find the name being declared. */
600		/* This is complicated because of procedure and */
601		/* array modifiers. */
602		for ( ; ; )
603		   {	p = skipspace(p - 1, -1);
604			switch ( *p )
605			   {
606			   case ']':	/* skip array dimension(s) */
607			   case ')':	/* skip procedure args OR name */
608			   {	int level = 1;
609				while ( level )
610				 switch ( *--p )
611				   {
612				   case ']': case ')': level++; break;
613				   case '[': case '(': level--; break;
614				   case '/': p = skipspace(p, -1) + 1; break;
615				   default: ;
616				   }
617			   }
618				if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
619				   {	/* We found the name being declared */
620					while ( !isidfirstchar(*p) )
621					  p = skipspace(p, 1) + 1;
622					goto found;
623				   }
624				break;
625			   default:
626				goto found;
627			   }
628		   }
629found:		if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
630		  {	if ( convert_varargs )
631			  {	*bp++ = "va_alist";
632				vararg = p-2;
633			  }
634			else
635			  {	p++;
636				if ( bp == breaks + 1 )	/* sole argument */
637				  writeblanks(breaks[0], p);
638				else
639				  writeblanks(bp[-1] - 1, p);
640				bp--;
641			  }
642		   }
643		else
644		   {	while ( isidchar(*p) ) p--;
645			*bp++ = p+1;
646		   }
647		p = end;
648	   }
649	while ( *p++ == ',' );
650	*bp = p;
651	/* Make a special check for 'void' arglist */
652	if ( bp == breaks+2 )
653	   {	p = skipspace(breaks[0], 1);
654		if ( !strncmp(p, "void", 4) )
655		   {	p = skipspace(p+4, 1);
656			if ( p == breaks[2] - 1 )
657			   {	bp = breaks;	/* yup, pretend arglist is empty */
658				writeblanks(breaks[0], p + 1);
659			   }
660		   }
661	   }
662	/* Put out the function name and left parenthesis. */
663	p = buf;
664	while ( p != endfn ) putc(*p, out), p++;
665	/* Put out the declaration. */
666	if ( header )
667	  {	fputs(");", out);
668		for ( p = breaks[0]; *p; p++ )
669		  if ( *p == '\r' || *p == '\n' )
670		    putc(*p, out);
671	  }
672	else
673	  {	for ( ap = breaks+1; ap < bp; ap += 2 )
674		  {	p = *ap;
675			while ( isidchar(*p) )
676			  putc(*p, out), p++;
677			if ( ap < bp - 1 )
678			  fputs(", ", out);
679		  }
680		fputs(")  ", out);
681		/* Put out the argument declarations */
682		for ( ap = breaks+2; ap <= bp; ap += 2 )
683		  (*ap)[-1] = ';';
684		if ( vararg != 0 )
685		  {	*vararg = 0;
686			fputs(breaks[0], out);		/* any prior args */
687			fputs("va_dcl", out);		/* the final arg */
688			fputs(bp[0], out);
689		  }
690		else
691		  fputs(breaks[0], out);
692	  }
693	free((char *)breaks);
694	return 0;
695}
696