text: /* Copyright (C) 1989, 1991, 1993 Aladdin Enterprises. All rights reserved. */
  
  /* ansi2knr.c */
  /* Convert ANSI function declarations to K&R syntax */
  
  /*
  ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY.  No author or distributor accepts responsibility to anyone for the
  consequences of using it or for whether it serves any particular purpose or
  works at all, unless he says so in writing.  Refer to the GNU General Public
  License (the "GPL") for full details.
  
  Everyone is granted permission to copy, modify and redistribute ansi2knr,
  but only under the conditions described in the GPL.  A copy of this license
  is supposed to have been given to you along with ansi2knr so you can know
  your rights and responsibilities.  It should be in a file named COPYLEFT.
  [In the IJG distribution, the GPL appears below, not in a separate file.]
  Among other things, the copyright notice and this notice must be preserved
  on all copies.
  
  We explicitly state here what we believe is already implied by the GPL: if
  the ansi2knr program is distributed as a separate set of sources and a
  separate executable file which are aggregated on a storage medium together
  with another program, this in itself does not bring the other program under
  the GPL, nor does the mere fact that such a program or the procedures for
  constructing it invoke the ansi2knr executable bring any other part of the
  program under the GPL.
  */
  
  /*
  ---------- Here is the GNU GPL file COPYING, referred to above ----------
  ----- These terms do NOT apply to the JPEG software itself; see README ------
  
  		    GHOSTSCRIPT GENERAL PUBLIC LICENSE
  		    (Clarified 11 Feb 1988)
  
   Copyright (C) 1988 Richard M. Stallman
   Everyone is permitted to copy and distribute verbatim copies of this
   license, but changing it is not allowed.  You can also use this wording
   to make the terms for other programs.
  
    The license agreements of most software companies keep you at the
  mercy of those companies.  By contrast, our general public license is
  intended to give everyone the right to share Ghostscript.  To make sure
  that you get the rights we want you to have, we need to make
  restrictions that forbid anyone to deny you these rights or to ask you
  to surrender the rights.  Hence this license agreement.
  
    Specifically, we want to make sure that you have the right to give
  away copies of Ghostscript, that you receive source code or else can get
  it if you want it, that you can change Ghostscript or use pieces of it
  in new free programs, and that you know you can do these things.
  
    To make sure that everyone has such rights, we have to forbid you to
  deprive anyone else of these rights.  For example, if you distribute
  copies of Ghostscript, you must give the recipients all the rights that
  you have.  You must make sure that they, too, receive or can get the
  source code.  And you must tell them their rights.
  
    Also, for our own protection, we must make certain that everyone finds
  out that there is no warranty for Ghostscript.  If Ghostscript is
  modified by someone else and passed on, we want its recipients to know
  that what they have is not what we distributed, so that any problems
  introduced by others will not reflect on our reputation.
  
    Therefore we (Richard M. Stallman and the Free Software Foundation,
  Inc.) make the following terms which say what you must do to be allowed
  to distribute or change Ghostscript.
  
  
  			COPYING POLICIES
  
    1. You may copy and distribute verbatim copies of Ghostscript source
  code as you receive it, in any medium, provided that you conspicuously
  and appropriately publish on each copy a valid copyright and license
  notice "Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
  Distributed by Free Software Foundation, Inc." (or with whatever year is
  appropriate); keep intact the notices on all files that refer to this
  License Agreement and to the absence of any warranty; and give any other
  recipients of the Ghostscript program a copy of this License Agreement
  along with the program.  You may charge a distribution fee for the
  physical act of transferring a copy.
  
    2. You may modify your copy or copies of Ghostscript or any portion of
  it, and copy and distribute such modifications under the terms of
  Paragraph 1 above, provided that you also do the following:
  
      a) cause the modified files to carry prominent notices stating
      that you changed the files and the date of any change; and
  
      b) cause the whole of any work that you distribute or publish,
      that in whole or in part contains or is a derivative of Ghostscript
      or any part thereof, to be licensed at no charge to all third
      parties on terms identical to those contained in this License
      Agreement (except that you may choose to grant more extensive
      warranty protection to some or all third parties, at your option).
  
      c) You may charge a distribution fee for the physical act of
      transferring a copy, and you may at your option offer warranty
      protection in exchange for a fee.
  
  Mere aggregation of another unrelated program with this program (or its
  derivative) on a volume of a storage or distribution medium does not bring
  the other program under the scope of these terms.
  
    3. You may copy and distribute Ghostscript (or a portion or derivative
  of it, under Paragraph 2) in object code or executable form under the
  terms of Paragraphs 1 and 2 above provided that you also do one of the
  following:
  
      a) accompany it with the complete corresponding machine-readable
      source code, which must be distributed under the terms of
      Paragraphs 1 and 2 above; or,
  
      b) accompany it with a written offer, valid for at least three
      years, to give any third party free (except for a nominal
      shipping charge) a complete machine-readable copy of the
      corresponding source code, to be distributed under the terms of
      Paragraphs 1 and 2 above; or,
  
      c) accompany it with the information you received as to where the
      corresponding source code may be obtained.  (This alternative is
      allowed only for noncommercial distribution and only if you
      received the program in object code or executable form alone.)
  
  For an executable file, complete source code means all the source code for
  all modules it contains; but, as a special exception, it need not include
  source code for modules which are standard libraries that accompany the
  operating system on which the executable file runs.
  
    4. You may not copy, sublicense, distribute or transfer Ghostscript
  except as expressly provided under this License Agreement.  Any attempt
  otherwise to copy, sublicense, distribute or transfer Ghostscript is
  void and your rights to use the program under this License agreement
  shall be automatically terminated.  However, parties who have received
  computer software programs from you with this License Agreement will not
  have their licenses terminated so long as such parties remain in full
  compliance.
  
    5. If you wish to incorporate parts of Ghostscript into other free
  programs whose distribution conditions are different, write to the Free
  Software Foundation at 675 Mass Ave, Cambridge, MA 02139.  We have not
  yet worked out a simple rule that can be stated here, but we will often
  permit this.  We will be guided by the two goals of preserving the free
  status of all derivatives of our free software and of promoting the
  sharing and reuse of software.
  
  Your comments and suggestions about our licensing policies and our
  software are welcome!  Please contact the Free Software Foundation,
  Inc., 675 Mass Ave, Cambridge, MA 02139, or call (617) 876-3296.
  
  		       NO WARRANTY
  
    BECAUSE GHOSTSCRIPT IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
  NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW.  EXCEPT
  WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC, RICHARD
  M. STALLMAN, ALADDIN ENTERPRISES, L. PETER DEUTSCH, AND/OR OTHER PARTIES
  PROVIDE GHOSTSCRIPT "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
  EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE
  ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF GHOSTSCRIPT IS WITH
  YOU.  SHOULD GHOSTSCRIPT PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
  NECESSARY SERVICING, REPAIR OR CORRECTION.
  
    IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.
  STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., L. PETER DEUTSCH, ALADDIN
  ENTERPRISES, AND/OR ANY OTHER PARTY WHO MAY MODIFY AND REDISTRIBUTE
  GHOSTSCRIPT AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING
  ANY LOST PROFITS, LOST MONIES, OR OTHER SPECIAL, INCIDENTAL OR
  CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
  (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
  INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR A FAILURE OF THE
  PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) GHOSTSCRIPT, EVEN IF YOU
  HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY CLAIM
  BY ANY OTHER PARTY.
  
  -------------------- End of file COPYING ------------------------------
  */
  
  
  #include <stdio.h>
  #include <ctype.h>
  
  #ifdef BSD
  #include <strings.h>
  #else
  #ifdef VMS
  	extern int strlen(), strncmp();
  #else
  #include <string.h>
  #endif
  #endif
  
  /* malloc and free should be declared in stdlib.h, */
  /* but if you've got a K&R compiler, they probably aren't. */
  #ifdef MSDOS
  #include <malloc.h>
  #else
  #ifdef VMS
       extern char *malloc();
       extern void free();
  #else
       extern char *malloc();
       extern int free();
  #endif
  #endif
  
  /* Usage:
  	ansi2knr input_file [output_file]
   * If no output_file is supplied, output goes to stdout.
   * There are no error messages.
   *
   * ansi2knr recognizes functions by seeing a non-keyword identifier
   * at the left margin, followed by a left parenthesis,
   * with a right parenthesis as the last character on the line.
   * It will recognize a multi-line header provided that the last character
   * of the last line of the header is a right parenthesis,
   * and no intervening line ends with a left brace or a semicolon.
   * These algorithms ignore whitespace and comments, except that
   * the function name must be the first thing on the line.
   * The following constructs will confuse it:
   *	- Any other construct that starts at the left margin and
   *	    follows the above syntax (such as a macro or function call).
   *	- Macros that tinker with the syntax of the function header.
   */
  
  /* Scanning macros */
  #define isidchar(ch) (isalnum(ch) || (ch) == '_')
  #define isidfirstchar(ch) (isalpha(ch) || (ch) == '_')
  
  /* Forward references */
  char *skipspace();
  int writeblanks();
  int test1();
  int convert1();
  
  /* The main program */
  main(argc, argv)
      int argc;
      char *argv[];
  {	FILE *in, *out;
  #define bufsize 5000			/* arbitrary size */
  	char *buf;
  	char *line;
  	switch ( argc )
  	   {
  	default:
  		printf("Usage: ansi2knr input_file [output_file]\n");
  		exit(0);
  	case 2:
  		out = stdout; break;
  	case 3:
  		out = fopen(argv[2], "w");
  		if ( out == NULL )
  		   {	fprintf(stderr, "Cannot open %s\n", argv[2]);
  			exit(1);
  		   }
  	   }
  	in = fopen(argv[1], "r");
  	if ( in == NULL )
  	   {	fprintf(stderr, "Cannot open %s\n", argv[1]);
  		exit(1);
  	   }
  	fprintf(out, "#line 1 \"%s\"\n", argv[1]);
  	buf = malloc(bufsize);
  	line = buf;
  	while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
  	   {	switch ( test1(buf) )
  		   {
  		case 1:			/* a function */
  			convert1(buf, out);
  			break;
  		case -1:		/* maybe the start of a function */
  			line = buf + strlen(buf);
  			if ( line != buf + (bufsize - 1) ) /* overflow check */
  				continue;
  			/* falls through */
  		default:		/* not a function */
  			fputs(buf, out);
  			break;
  		   }
  		line = buf;
  	   }
  	if ( line != buf ) fputs(buf, out);
  	free(buf);
  	fclose(out);
  	fclose(in);
  	return 0;
  }
  
  /* Skip over space and comments, in either direction. */
  char *
  skipspace(p, dir)
      register char *p;
      register int dir;			/* 1 for forward, -1 for backward */
  {	for ( ; ; )
  	   {	while ( isspace(*p) ) p += dir;
  		if ( !(*p == '/' && p[dir] == '*') ) break;
  		p += dir;  p += dir;
  		while ( !(*p == '*' && p[dir] == '/') )
  		   {	if ( *p == 0 ) return p;	/* multi-line comment?? */
  			p += dir;
  		   }
  		p += dir;  p += dir;
  	   }
  	return p;
  }
  
  /*
   * Write blanks over part of a string.
   */
  int
  writeblanks(start, end)
      char *start;
      char *end;
  {	char *p;
  	for ( p = start; p < end; p++ ) *p = ' ';
  	return 0;
  }
  
  /*
   * Test whether the string in buf is a function definition.
   * The string may contain and/or end with a newline.
   * Return as follows:
   *	0 - definitely not a function definition;
   *	1 - definitely a function definition;
   *	-1 - may be the beginning of a function definition,
   *		append another line and look again.
   */
  int
  test1(buf)
      char *buf;
  {	register char *p = buf;
  	char *bend;
  	char *endfn;
  	int contin;
  	if ( !isidfirstchar(*p) )
  		return 0;		/* no name at left margin */
  	bend = skipspace(buf + strlen(buf) - 1, -1);
  	switch ( *bend )
  	   {
  	case ')': contin = 1; break;
  	case '{':
  	case ';': return 0;		/* not a function */
  	default: contin = -1;
  	   }
  	while ( isidchar(*p) ) p++;
  	endfn = p;
  	p = skipspace(p, 1);
  	if ( *p++ != '(' )
  		return 0;		/* not a function */
  	p = skipspace(p, 1);
  	if ( *p == ')' )
  		return 0;		/* no parameters */
  	/* Check that the apparent function name isn't a keyword. */
  	/* We only need to check for keywords that could be followed */
  	/* by a left parenthesis (which, unfortunately, is most of them). */
  	   {	static char *words[] =
  		   {	"asm", "auto", "case", "char", "const", "double",
  			"extern", "float", "for", "if", "int", "long",
  			"register", "return", "short", "signed", "sizeof",
  			"static", "switch", "typedef", "unsigned",
  			"void", "volatile", "while", 0
  		   };
  		char **key = words;
  		char *kp;
  		int len = endfn - buf;
  		while ( (kp = *key) != 0 )
  		   {	if ( strlen(kp) == len && !strncmp(kp, buf, len) )
  				return 0;	/* name is a keyword */
  			key++;
  		   }
  	   }
  	return contin;
  }
  
  int
  convert1(buf, out)
      char *buf;
      FILE *out;
  {	char *endfn;
  	register char *p;
  	char **breaks;
  	unsigned num_breaks = 2;	/* for testing */
  	char **btop;
  	char **bp;
  	char **ap;
  	/* Pre-ANSI implementations don't agree on whether strchr */
  	/* is called strchr or index, so we open-code it here. */
  	for ( endfn = buf; *(endfn++) != '('; ) ;
  top:	p = endfn;
  	breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
  	if ( breaks == 0 )
  	   {	/* Couldn't allocate break table, give up */
  		fprintf(stderr, "Unable to allocate break table!\n");
  		fputs(buf, out);
  		return -1;
  	   }
  	btop = breaks + num_breaks * 2 - 2;
  	bp = breaks;
  	/* Parse the argument list */
  	do
  	   {	int level = 0;
  		char *end = NULL;
  		if ( bp >= btop )
  		   {	/* Filled up break table. */
  			/* Allocate a bigger one and start over. */
  			free((char *)breaks);
  			num_breaks <<= 1;
  			goto top;
  		   }
  		*bp++ = p;
  		/* Find the end of the argument */
  		for ( ; end == NULL; p++ )
  		   {	switch(*p)
  			   {
  			case ',': if ( !level ) end = p; break;
  			case '(': level++; break;
  			case ')': if ( --level < 0 ) end = p; break;
  			case '/': p = skipspace(p, 1) - 1; break;
  			default: ;
  			   }
  		   }
  		p--;			/* back up over terminator */
  		/* Find the name being declared. */
  		/* This is complicated because of procedure and */
  		/* array modifiers. */
  		for ( ; ; )
  		   {	p = skipspace(p - 1, -1);
  			switch ( *p )
  			   {
  			case ']':	/* skip array dimension(s) */
  			case ')':	/* skip procedure args OR name */
  			   {	int level = 1;
  				while ( level )
  				 switch ( *--p )
  				   {
  				case ']': case ')': level++; break;
  				case '[': case '(': level--; break;
  				case '/': p = skipspace(p, -1) + 1; break;
  				default: ;
  				   }
  			   }
  				if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
  				   {	/* We found the name being declared */
  					while ( !isidfirstchar(*p) )
  						p = skipspace(p, 1) + 1;
  					goto found;
  				   }
  				break;
  			default: goto found;
  			   }
  		   }
  found:		if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
  		   {	p++;
  			if ( bp == breaks + 1 )	/* sole argument */
  				writeblanks(breaks[0], p);
  			else
  				writeblanks(bp[-1] - 1, p);
  			bp--;
  		   }
  		else
  		   {	while ( isidchar(*p) ) p--;
  			*bp++ = p+1;
  		   }
  		p = end;
  	   }
  	while ( *p++ == ',' );
  	*bp = p;
  	/* Make a special check for 'void' arglist */
  	if ( bp == breaks+2 )
  	   {	p = skipspace(breaks[0], 1);
  		if ( !strncmp(p, "void", 4) )
  		   {	p = skipspace(p+4, 1);
  			if ( p == breaks[2] - 1 )
  			   {	bp = breaks;	/* yup, pretend arglist is empty */
  				writeblanks(breaks[0], p + 1);
  			   }
  		   }
  	   }
  	/* Put out the function name */
  	p = buf;
  	while ( p != endfn ) putc(*p, out), p++;
  	/* Put out the declaration */
  	for ( ap = breaks+1; ap < bp; ap += 2 )
  	   {	p = *ap;
  		while ( isidchar(*p) ) putc(*p, out), p++;
  		if ( ap < bp - 1 ) fputs(", ", out);
  	   }
  	fputs(")  ", out);
  	/* Put out the argument declarations */
  	for ( ap = breaks+2; ap <= bp; ap += 2 ) (*ap)[-1] = ';';
  	fputs(breaks[0], out);
  	free((char *)breaks);
  	return 0;
  }
  