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/* Copyright (C) 1989, 2000 Aladdin Enterprises. All rights reserved. */
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/*$Id: ansi2knr.c,v 1.1.1.1 2002/07/30 21:39:41 camm Exp $*/
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/* Convert ANSI C function definitions to K&R ("traditional C") syntax */
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ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY. No author or distributor accepts responsibility to anyone for the
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consequences of using it or for whether it serves any particular purpose or
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works at all, unless he says so in writing. Refer to the GNU General Public
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License (the "GPL") for full details.
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Everyone is granted permission to copy, modify and redistribute ansi2knr,
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but only under the conditions described in the GPL. A copy of this license
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is supposed to have been given to you along with ansi2knr so you can know
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your rights and responsibilities. It should be in a file named COPYLEFT,
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or, if there is no file named COPYLEFT, a file named COPYING. Among other
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things, the copyright notice and this notice must be preserved on all
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We explicitly state here what we believe is already implied by the GPL: if
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the ansi2knr program is distributed as a separate set of sources and a
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separate executable file which are aggregated on a storage medium together
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with another program, this in itself does not bring the other program under
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the GPL, nor does the mere fact that such a program or the procedures for
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constructing it invoke the ansi2knr executable bring any other part of the
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program under the GPL.
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ansi2knr [--filename FILENAME] [INPUT_FILE [OUTPUT_FILE]]
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* --filename provides the file name for the #line directive in the output,
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* overriding input_file (if present).
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* If no input_file is supplied, input is read from stdin.
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* If no output_file is supplied, output goes to stdout.
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* There are no error messages.
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* ansi2knr recognizes function definitions by seeing a non-keyword
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* identifier at the left margin, followed by a left parenthesis, with a
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* right parenthesis as the last character on the line, and with a left
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* brace as the first token on the following line (ignoring possible
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* intervening comments and/or preprocessor directives), except that a line
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* identifier1(identifier2)
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* will not be considered a function definition unless identifier2 is
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* the word "void", and a line consisting of
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* identifier1(identifier2, <<arbitrary>>)
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* will not be considered a function definition.
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* ansi2knr will recognize a multi-line header provided that no intervening
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* line ends with a left or right brace or a semicolon. These algorithms
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* ignore whitespace, comments, and preprocessor directives, except that
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* the function name must be the first thing on the line. The following
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* constructs will confuse it:
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* - Any other construct that starts at the left margin and
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* follows the above syntax (such as a macro or function call).
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* - Some macros that tinker with the syntax of function headers.
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* The original and principal author of ansi2knr is L. Peter Deutsch
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* <ghost@aladdin.com>. Other authors are noted in the change history
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* that follows (in reverse chronological order):
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lpd 2000-04-12 backs out Eggert's changes because of bugs:
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- concatlits didn't declare the type of its bufend argument;
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- concatlits didn't't recognize when it was inside a comment;
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- scanstring could scan backward past the beginning of the string; when
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- the check for \ + newline in scanstring was unnecessary.
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2000-03-05 Paul Eggert <eggert@twinsun.com>
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Add support for concatenated string literals.
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* ansi2knr.c (concatlits): New decl.
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(main): Invoke concatlits to concatenate string literals.
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(scanstring): Handle backslash-newline correctly. Work with
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character constants. Fix bug when scanning backwards through
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backslash-quote. Check for unterminated strings.
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(convert1): Parse character constants, too.
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(appendline, concatlits): New functions.
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* ansi2knr.1: Document this.
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lpd 1999-08-17 added code to allow preprocessor directives
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wherever comments are allowed
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lpd 1999-04-12 added minor fixes from Pavel Roskin
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<pavel_roskin@geocities.com> for clean compilation with
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lpd 1999-03-22 added hack to recognize lines consisting of
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identifier1(identifier2, xxx) as *not* being procedures
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lpd 1999-02-03 made indentation of preprocessor commands consistent
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lpd 1999-01-28 fixed two bugs: a '/' in an argument list caused an
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endless loop; quoted strings within an argument list
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lpd 1999-01-24 added a check for write errors on the output,
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suggested by Jim Meyering <meyering@ascend.com>
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lpd 1998-11-09 added further hack to recognize identifier(void)
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lpd 1998-10-23 added hack to recognize lines consisting of
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identifier1(identifier2) as *not* being procedures
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lpd 1997-12-08 made input_file optional; only closes input and/or
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output file if not stdin or stdout respectively; prints
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usage message on stderr rather than stdout; adds
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--filename switch (changes suggested by
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<ceder@lysator.liu.se>)
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lpd 1996-01-21 added code to cope with not HAVE_CONFIG_H and with
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compilers that don't understand void, as suggested by
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lpd 1996-01-15 changed to require that the first non-comment token
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on the line following a function header be a left brace,
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to reduce sensitivity to macros, as suggested by Tom Lane
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lpd 1995-06-22 removed #ifndefs whose sole purpose was to define
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undefined preprocessor symbols as 0; changed all #ifdefs
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for configuration symbols to #ifs
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lpd 1995-04-05 changed copyright notice to make it clear that
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including ansi2knr in a program does not bring the entire
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program under the GPL
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lpd 1994-12-18 added conditionals for systems where ctype macros
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don't handle 8-bit characters properly, suggested by
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Francois Pinard <pinard@iro.umontreal.ca>;
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removed --varargs switch (this is now the default)
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lpd 1994-10-10 removed CONFIG_BROKETS conditional
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lpd 1994-07-16 added some conditionals to help GNU `configure',
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suggested by Francois Pinard <pinard@iro.umontreal.ca>;
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properly erase prototype args in function parameters,
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contributed by Jim Avera <jima@netcom.com>;
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correct error in writeblanks (it shouldn't erase EOLs)
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lpd 1989-xx-xx original version
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/* Most of the conditionals here are to make ansi2knr work with */
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/* or without the GNU configure machinery. */
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For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).
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This will define HAVE_CONFIG_H and so, activate the following lines.
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# if STDC_HEADERS || HAVE_STRING_H
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# include <strings.h>
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#else /* not HAVE_CONFIG_H */
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/* Otherwise do it the hard way */
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# include <strings.h>
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extern int strlen(), strncmp();
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#endif /* not HAVE_CONFIG_H */
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malloc and free should be declared in stdlib.h,
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but if you've got a K&R compiler, they probably aren't.
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extern char *malloc();
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extern char *malloc();
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/* Define NULL (for *very* old compilers). */
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* The ctype macros don't always handle 8-bit characters correctly.
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* Compensate for this here.
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# undef HAVE_ISASCII /* just in case */
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# define HAVE_ISASCII 1
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#if STDC_HEADERS || !HAVE_ISASCII
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# define is_ascii(c) 1
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# define is_ascii(c) isascii(c)
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#define is_space(c) (is_ascii(c) && isspace(c))
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#define is_alpha(c) (is_ascii(c) && isalpha(c))
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#define is_alnum(c) (is_ascii(c) && isalnum(c))
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/* Scanning macros */
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#define isidchar(ch) (is_alnum(ch) || (ch) == '_')
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#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')
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/* Forward references */
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char *ppdirforward();
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char *ppdirbackward();
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/* The main program */
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char *program_name = argv[0];
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char *output_name = 0;
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#define bufsize 5000 /* arbitrary size */
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"Usage: ansi2knr [--filename FILENAME] [INPUT_FILE [OUTPUT_FILE]]\n";
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* In previous versions, ansi2knr recognized a --varargs switch.
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* If this switch was supplied, ansi2knr would attempt to convert
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* a ... argument to va_alist and va_dcl; if this switch was not
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* supplied, ansi2knr would simply drop any such arguments.
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* Now, ansi2knr always does this conversion, and we only
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* check for this switch for backward compatibility.
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int convert_varargs = 1;
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while ( argc > 1 && argv[1][0] == '-' ) {
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if ( !strcmp(argv[1], "--varargs") ) {
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if ( !strcmp(argv[1], "--filename") && argc > 2 ) {
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fprintf(stderr, "%s: Unrecognized switch: %s\n", program_name,
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fprintf(stderr, usage);
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fprintf(stderr, usage);
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output_name = argv[2];
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out = fopen(output_name, "w");
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fprintf(stderr, "%s: Cannot open output file %s\n",
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program_name, output_name);
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in = fopen(argv[1], "r");
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fprintf(stderr, "%s: Cannot open input file %s\n",
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program_name, argv[1]);
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fprintf(out, "#line 1 \"%s\"\n", filename);
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buf = malloc(bufsize);
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fprintf(stderr, "Unable to allocate read buffer!\n");
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while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
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test: line += strlen(line);
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switch ( test1(buf) )
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case 2: /* a function header */
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convert1(buf, out, 1, convert_varargs);
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case 1: /* a function */
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/* Check for a { at the start of the next line. */
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f: if ( line >= buf + (bufsize - 1) ) /* overflow check */
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if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )
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switch ( *skipspace(ppdirforward(more), 1) )
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/* Definitely a function header. */
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convert1(buf, out, 0, convert_varargs);
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/* The next line was blank or a comment: */
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/* keep scanning for a non-comment. */
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line += strlen(line);
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/* buf isn't a function header, but */
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case -1: /* maybe the start of a function */
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if ( line != buf + (bufsize - 1) ) /* overflow check */
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default: /* not a function */
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output_error = ferror(out);
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output_error |= fclose(out);
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} else { /* out == stdout */
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output_error = ferror(out);
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if ( output_error ) {
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fprintf(stderr, "%s: error writing to %s\n", program_name,
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(output_name ? output_name : "stdout"));
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* Skip forward or backward over one or more preprocessor directives.
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for (; *p == '#'; ++p) {
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for (; *p != '\r' && *p != '\n'; ++p)
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if (*p == '\r' && p[1] == '\n')
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ppdirbackward(p, limit)
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if (*np == '\n' && np[-1] == '\r')
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for (; np > limit && np[-1] != '\r' && np[-1] != '\n'; --np)
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* Skip over whitespace, comments, and preprocessor directives,
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* in either direction.
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int dir; /* 1 for forward, -1 for backward */
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while ( is_space(*p) )
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if ( !(*p == '/' && p[dir] == '*') )
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while ( !(*p == '*' && p[dir] == '/') ) {
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return p; /* multi-line comment?? */
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/* Scan over a quoted string, in either direction. */
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for (p += dir; ; p += dir)
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if (*p == '"' && p[-dir] != '\\')
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* Write blanks over part of a string.
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* Don't overwrite end-of-line characters.
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writeblanks(start, end)
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for ( p = start; p < end; p++ )
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if ( *p != '\r' && *p != '\n' )
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* Test whether the string in buf is a function definition.
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* The string may contain and/or end with a newline.
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* 0 - definitely not a function definition;
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* 1 - definitely a function definition;
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* 2 - definitely a function prototype (NOT USED);
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* -1 - may be the beginning of a function definition,
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* append another line and look again.
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* The reason we don't attempt to convert function prototypes is that
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* Ghostscript's declaration-generating macros look too much like
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* prototypes, and confuse the algorithms.
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if ( !isidfirstchar(*p) )
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return 0; /* no name at left margin */
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bend = skipspace(ppdirbackward(buf + strlen(buf) - 1, buf), -1);
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case ';': contin = 0 /*2*/; break;
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case ')': contin = 1; break;
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case '{': return 0; /* not a function */
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case '}': return 0; /* not a function */
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default: contin = -1;
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while ( isidchar(*p) )
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return 0; /* not a function */
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return 0; /* no parameters */
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/* Check that the apparent function name isn't a keyword. */
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/* We only need to check for keywords that could be followed */
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/* by a left parenthesis (which, unfortunately, is most of them). */
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{ static char *words[] =
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{ "asm", "auto", "case", "char", "const", "double",
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"extern", "float", "for", "if", "int", "long",
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"register", "return", "short", "signed", "sizeof",
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"static", "switch", "typedef", "unsigned",
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"void", "volatile", "while", 0
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unsigned len = endfn - buf;
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while ( (kp = *key) != 0 )
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{ if ( strlen(kp) == len && !strncmp(kp, buf, len) )
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return 0; /* name is a keyword */
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* Check for identifier1(identifier2) and not
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* identifier1(void), or identifier1(identifier2, xxxx).
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while ( isidchar(*p) )
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(*p == ')' && (len != 4 || strncmp(id, "void", 4)))
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return 0; /* not a function */
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* If the last significant character was a ), we need to count
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* parentheses, because it might be part of a formal parameter
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* that is a procedure.
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for (p = skipspace(buf, 1); *p; p = skipspace(p + 1, 1))
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level += (*p == '(' ? 1 : *p == ')' ? -1 : 0);
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/* Convert a recognized function definition or header to K&R syntax. */
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convert1(buf, out, header, convert_varargs)
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int header; /* Boolean */
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int convert_varargs; /* Boolean */
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* The breaks table contains pointers to the beginning and end
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unsigned num_breaks = 2; /* for testing */
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/* Pre-ANSI implementations don't agree on whether strchr */
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/* is called strchr or index, so we open-code it here. */
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for ( endfn = buf; *(endfn++) != '('; )
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breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
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if ( breaks == NULL )
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{ /* Couldn't allocate break table, give up */
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fprintf(stderr, "Unable to allocate break table!\n");
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btop = breaks + num_breaks * 2 - 2;
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/* Parse the argument list */
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{ /* Filled up break table. */
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/* Allocate a bigger one and start over. */
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free((char *)breaks);
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/* Find the end of the argument */
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for ( ; end == NULL; p++ )
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if ( !level ) end = p;
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if ( !level ) lp = p;
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if ( --level < 0 ) end = p;
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p = skipspace(p, 1) - 1;
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p = scanstring(p, 1) - 1;
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/* Erase any embedded prototype parameters. */
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writeblanks(lp + 1, rp);
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p--; /* back up over terminator */
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/* Find the name being declared. */
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/* This is complicated because of procedure and */
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/* array modifiers. */
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{ p = skipspace(p - 1, -1);
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case ']': /* skip array dimension(s) */
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case ')': /* skip procedure args OR name */
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if (p > buf && p[-1] == '*')
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p = skipspace(p, -1) + 1;
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p = scanstring(p, -1) + 1;
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if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
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{ /* We found the name being declared */
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while ( !isidfirstchar(*p) )
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p = skipspace(p, 1) + 1;
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found: if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
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{ if ( convert_varargs )
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{ *bp++ = "va_alist";
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if ( bp == breaks + 1 ) /* sole argument */
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writeblanks(breaks[0], p);
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writeblanks(bp[-1] - 1, p);
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{ while ( isidchar(*p) ) p--;
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while ( *p++ == ',' );
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/* Make a special check for 'void' arglist */
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if ( bp == breaks+2 )
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{ p = skipspace(breaks[0], 1);
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if ( !strncmp(p, "void", 4) )
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{ p = skipspace(p+4, 1);
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if ( p == breaks[2] - 1 )
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{ bp = breaks; /* yup, pretend arglist is empty */
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writeblanks(breaks[0], p + 1);
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/* Put out the function name and left parenthesis. */
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while ( p != endfn ) putc(*p, out), p++;
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/* Put out the declaration. */
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for ( p = breaks[0]; *p; p++ )
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if ( *p == '\r' || *p == '\n' )
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{ for ( ap = breaks+1; ap < bp; ap += 2 )
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while ( isidchar(*p) )
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/* Put out the argument declarations */
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for ( ap = breaks+2; ap <= bp; ap += 2 )
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fputs(breaks[0], out); /* any prior args */
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fputs("va_dcl", out); /* the final arg */
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fputs(breaks[0], out);
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free((char *)breaks);
added
removed
gmp3/ansi2knr.c
