/* ansi2knr.c */

/* Convert ANSI C function definitions to K&R ("traditional C") 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 COPYLEFT, 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

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have their licenses terminated so long as such parties remain in full

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  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

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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 COPYLEFT ------------------------------

*/

/*

 * Usage:

	ansi2knr input_file [output_file]

 * If no output_file is supplied, output goes to stdout.

 * There are no error messages.

 *

 * ansi2knr recognizes function definitions 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,

 * and with a left brace as the first token on the following line

 * (ignoring possible intervening comments).

 * It will recognize a multi-line header provided that no intervening

 * line ends with a left or right 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).

 *	- Some macros that tinker with the syntax of the function header.

 */

/*

 * The original and principal author of ansi2knr is L. Peter Deutsch

 * <ghost@aladdin.com>.  Other authors are noted in the change history</ghost@aladdin.com>

 * that follows (in reverse chronological order):

	lpd 96-01-21 added code to cope with not HAVE_CONFIG_H and with

		compilers that don't understand void, as suggested by

		Tom Lane

	lpd 96-01-15 changed to require that the first non-comment token

		on the line following a function header be a left brace,

		to reduce sensitivity to macros, as suggested by Tom Lane

		<tgl@sss.pgh.pa.us></tgl@sss.pgh.pa.us>

	lpd 95-06-22 removed #ifndefs whose sole purpose was to define

		undefined preprocessor symbols as 0; changed all #ifdefs

		for configuration symbols to #ifs

	lpd 95-04-05 changed copyright notice to make it clear that

		including ansi2knr in a program does not bring the entire

		program under the GPL

	lpd 94-12-18 added conditionals for systems where ctype macros

		don't handle 8-bit characters properly, suggested by

		Francois Pinard <pinard@iro.umontreal.ca>;</pinard@iro.umontreal.ca>

		removed --varargs switch (this is now the default)

	lpd 94-10-10 removed CONFIG_BROKETS conditional

	lpd 94-07-16 added some conditionals to help GNU `configure',

		suggested by Francois Pinard <pinard@iro.umontreal.ca>;</pinard@iro.umontreal.ca>

		properly erase prototype args in function parameters,

		contributed by Jim Avera <jima@netcom.com>;</jima@netcom.com>

		correct error in writeblanks (it shouldn't erase EOLs)

	lpd 89-xx-xx original version

 */

/* Most of the conditionals here are to make ansi2knr work with */

/* or without the GNU configure machinery. */

#if HAVE_CONFIG_H

# include <config.h></config.h>

#endif

#include <stdio.h></stdio.h>

#include <ctype.h></ctype.h>

#if HAVE_CONFIG_H

/*

   For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).

   This will define HAVE_CONFIG_H and so, activate the following lines.

 */

# if STDC_HEADERS || HAVE_STRING_H

#  include <string.h></string.h>

# else

#  include <strings.h></strings.h>

# endif

#else /* not HAVE_CONFIG_H */

/* Otherwise do it the hard way */

# ifdef BSD

#  include <strings.h></strings.h>

# else

#  ifdef VMS

    extern int strlen(), strncmp();

#  else

#   include <string.h></string.h>

#  endif

# endif

#endif /* not HAVE_CONFIG_H */

#if STDC_HEADERS

# include <stdlib.h></stdlib.h>

#else

/*

   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></malloc.h>

# else

#  ifdef VMS

     extern char *malloc();

     extern void free();

#  else

     extern char *malloc();

     extern int free();

#  endif

# endif

#endif

/*

 * The ctype macros don't always handle 8-bit characters correctly.

 * Compensate for this here.

 */

#ifdef isascii

#  undef HAVE_ISASCII		/* just in case */

#  define HAVE_ISASCII 1

#else

#endif

#if STDC_HEADERS || !HAVE_ISASCII

#  define is_ascii(c) 1

#else

#  define is_ascii(c) isascii(c)

#endif

#define is_space(c) (is_ascii(c) && isspace(c))

#define is_alpha(c) (is_ascii(c) && isalpha(c))

#define is_alnum(c) (is_ascii(c) && isalnum(c))

/* Scanning macros */

#define isidchar(ch) (is_alnum(ch) || (ch) == '_')

#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')

/* Forward references */

char *skipspace();

int writeblanks();

int test1();

int convert1();

/* The main program */

int

main(argc, argv)

    int argc;

    char *argv[];

{	FILE *in, *out;

#define bufsize 5000			/* arbitrary size */

	char *buf;

	char *line;

	char *more;

	/*

	 * In previous versions, ansi2knr recognized a --varargs switch.

	 * If this switch was supplied, ansi2knr would attempt to convert

	 * a ... argument to va_alist and va_dcl; if this switch was not

	 * supplied, ansi2knr would simply drop any such arguments.

	 * Now, ansi2knr always does this conversion, and we only

	 * check for this switch for backward compatibility.

	 */

	int convert_varargs = 1;

	if ( argc > 1 && argv[1][0] == '-' )

	  {	if ( !strcmp(argv[1], "--varargs") )

		  {	convert_varargs = 1;

			argc--;

			argv++;

		  }

		else

		  {	fprintf(stderr, "Unrecognized switch: %s\n", argv[1]);

			exit(1);

		  }

	  }

	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 output file %s\n", argv[2]);

			exit(1);

		   }

	   }

	in = fopen(argv[1], "r");

	if ( in == NULL )

	   {	fprintf(stderr, "Cannot open input file %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 )

	   {

test:		line += strlen(line);

		switch ( test1(buf) )

		   {

		case 2:			/* a function header */

			convert1(buf, out, 1, convert_varargs);

			break;

		case 1:			/* a function */

			/* Check for a { at the start of the next line. */

			more = ++line;

f:			if ( line >= buf + (bufsize - 1) ) /* overflow check */

			  goto wl;

			if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )

			  goto wl;

			switch ( *skipspace(more, 1) )

			  {

			  case '{':

			    /* Definitely a function header. */

			    convert1(buf, out, 0, convert_varargs);

			    fputs(more, out);

			    break;

			  case 0:

			    /* The next line was blank or a comment: */

			    /* keep scanning for a non-comment. */

			    line += strlen(line);

			    goto f;

			  default:

			    /* buf isn't a function header, but */

			    /* more might be. */

			    fputs(buf, out);

			    strcpy(buf, more);

			    line = buf;

			    goto test;

			  }

			break;

		case -1:		/* maybe the start of a function */

			if ( line != buf + (bufsize - 1) ) /* overflow check */

			  continue;

			/* falls through */

		default:		/* not a function */

wl:			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 ( is_space(*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.

 * Don't overwrite end-of-line characters.

 */

int

writeblanks(start, end)

    char *start;

    char *end;

{	char *p;

	for ( p = start; p < end; p++ )

	  if ( *p != '\r' && *p != '\n' )

	    *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;

 *	2 - definitely a function prototype (NOT USED);

 *	-1 - may be the beginning of a function definition,

 *		append another line and look again.

 * The reason we don't attempt to convert function prototypes is that

 * Ghostscript's declaration-generating macros look too much like

 * prototypes, and confuse the algorithms.

 */

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 = 0 /*2*/; break;

	   case ')': contin = 1; break;

	   case '{': return 0;		/* not a function */

	   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;

}

/* Convert a recognized function definition or header to K&R syntax. */

int

convert1(buf, out, header, convert_varargs)

    char *buf;

    FILE *out;

    int header;			/* Boolean */

    int convert_varargs;	/* Boolean */

{	char *endfn;

	register char *p;

	char **breaks;

	unsigned num_breaks = 2;	/* for testing */

	char **btop;

	char **bp;

	char **ap;

	char *vararg = 0;

	/* 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 *lp = NULL;

		char *rp;

		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 '(':

				if ( !level ) lp = p;

				level++;

				break;

			   case ')':

				if ( --level < 0 ) end = p;

				else rp = p;

				break;

			   case '/':

				p = skipspace(p, 1) - 1;

				break;

			   default:

				;

			   }

		   }

		/* Erase any embedded prototype parameters. */

		if ( lp )

		  writeblanks(lp + 1, rp);

		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] == '.' )

		  {	if ( convert_varargs )

			  {	*bp++ = "va_alist";

				vararg = p-2;

			  }

			else

			  {	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 and left parenthesis. */

	p = buf;

	while ( p != endfn ) putc(*p, out), p++;

	/* Put out the declaration. */

	if ( header )

	  {	fputs(");", out);

		for ( p = breaks[0]; *p; p++ )

		  if ( *p == '\r' || *p == '\n' )

		    putc(*p, out);

	  }

	else

	  {	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] = ';';

		if ( vararg != 0 )

		  {	*vararg = 0;

			fputs(breaks[0], out);		/* any prior args */

			fputs("va_dcl", out);		/* the final arg */

			fputs(bp[0], out);

		  }

		else

		  fputs(breaks[0], out);

	  }

	free((char *)breaks);

	return 0;

}