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-rw-r--r--jpeg/ansi2knr.c739
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diff --git a/jpeg/ansi2knr.c b/jpeg/ansi2knr.c
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-/* Copyright (C) 1989, 2000 Aladdin Enterprises. All rights reserved. */
-
-/*$Id: ansi2knr.c,v 1.14 2003/09/06 05:36:56 eggert Exp $*/
-/* 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,
-or, if there is no file named COPYLEFT, a file named COPYING. 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.
-*/
-
-/*
- * Usage:
- ansi2knr [--filename FILENAME] [INPUT_FILE [OUTPUT_FILE]]
- * --filename provides the file name for the #line directive in the output,
- * overriding input_file (if present).
- * If no input_file is supplied, input is read from stdin.
- * 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 and/or preprocessor directives), except that a line
- * consisting of only
- * identifier1(identifier2)
- * will not be considered a function definition unless identifier2 is
- * the word "void", and a line consisting of
- * identifier1(identifier2, <<arbitrary>>)
- * will not be considered a function definition.
- * ansi2knr 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, comments, and preprocessor directives, 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 function headers.
- */
-
-/*
- * The original and principal author of ansi2knr is L. Peter Deutsch
- * <ghost@aladdin.com>. Other authors are noted in the change history
- * that follows (in reverse chronological order):
-
- lpd 2000-04-12 backs out Eggert's changes because of bugs:
- - concatlits didn't declare the type of its bufend argument;
- - concatlits didn't recognize when it was inside a comment;
- - scanstring could scan backward past the beginning of the string; when
- - the check for \ + newline in scanstring was unnecessary.
-
- 2000-03-05 Paul Eggert <eggert@twinsun.com>
-
- Add support for concatenated string literals.
- * ansi2knr.c (concatlits): New decl.
- (main): Invoke concatlits to concatenate string literals.
- (scanstring): Handle backslash-newline correctly. Work with
- character constants. Fix bug when scanning backwards through
- backslash-quote. Check for unterminated strings.
- (convert1): Parse character constants, too.
- (appendline, concatlits): New functions.
- * ansi2knr.1: Document this.
-
- lpd 1999-08-17 added code to allow preprocessor directives
- wherever comments are allowed
- lpd 1999-04-12 added minor fixes from Pavel Roskin
- <pavel_roskin@geocities.com> for clean compilation with
- gcc -W -Wall
- lpd 1999-03-22 added hack to recognize lines consisting of
- identifier1(identifier2, xxx) as *not* being procedures
- lpd 1999-02-03 made indentation of preprocessor commands consistent
- lpd 1999-01-28 fixed two bugs: a '/' in an argument list caused an
- endless loop; quoted strings within an argument list
- confused the parser
- lpd 1999-01-24 added a check for write errors on the output,
- suggested by Jim Meyering <meyering@ascend.com>
- lpd 1998-11-09 added further hack to recognize identifier(void)
- as being a procedure
- lpd 1998-10-23 added hack to recognize lines consisting of
- identifier1(identifier2) as *not* being procedures
- lpd 1997-12-08 made input_file optional; only closes input and/or
- output file if not stdin or stdout respectively; prints
- usage message on stderr rather than stdout; adds
- --filename switch (changes suggested by
- <ceder@lysator.liu.se>)
- lpd 1996-01-21 added code to cope with not HAVE_CONFIG_H and with
- compilers that don't understand void, as suggested by
- Tom Lane
- lpd 1996-01-15 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>
- lpd 1995-06-22 removed #ifndefs whose sole purpose was to define
- undefined preprocessor symbols as 0; changed all #ifdefs
- for configuration symbols to #ifs
- lpd 1995-04-05 changed copyright notice to make it clear that
- including ansi2knr in a program does not bring the entire
- program under the GPL
- lpd 1994-12-18 added conditionals for systems where ctype macros
- don't handle 8-bit characters properly, suggested by
- Francois Pinard <pinard@iro.umontreal.ca>;
- removed --varargs switch (this is now the default)
- lpd 1994-10-10 removed CONFIG_BROKETS conditional
- lpd 1994-07-16 added some conditionals to help GNU `configure',
- suggested by Francois Pinard <pinard@iro.umontreal.ca>;
- properly erase prototype args in function parameters,
- contributed by Jim Avera <jima@netcom.com>;
- correct error in writeblanks (it shouldn't erase EOLs)
- lpd 1989-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>
-#endif
-
-#include <stdio.h>
-#include <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>
-# else
-# include <strings.h>
-# endif
-
-#else /* not HAVE_CONFIG_H */
-
-/* Otherwise do it the hard way */
-
-# ifdef BSD
-# include <strings.h>
-# else
-# ifdef VMS
- extern int strlen(), strncmp();
-# else
-# include <string.h>
-# endif
-# endif
-
-#endif /* not HAVE_CONFIG_H */
-
-#if STDC_HEADERS
-# include <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>
-# else
-# ifdef VMS
- extern char *malloc();
- extern void free();
-# else
- extern char *malloc();
- extern int free();
-# endif
-# endif
-
-#endif
-
-/* Define NULL (for *very* old compilers). */
-#ifndef NULL
-# define NULL (0)
-#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 *ppdirforward();
-char *ppdirbackward();
-char *skipspace();
-char *scanstring();
-int writeblanks();
-int test1();
-int convert1();
-
-/* The main program */
-int
-main(argc, argv)
- int argc;
- char *argv[];
-{ FILE *in = stdin;
- FILE *out = stdout;
- char *filename = 0;
- char *program_name = argv[0];
- char *output_name = 0;
-#define bufsize 5000 /* arbitrary size */
- char *buf;
- char *line;
- char *more;
- char *usage =
- "Usage: ansi2knr [--filename FILENAME] [INPUT_FILE [OUTPUT_FILE]]\n";
- /*
- * 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;
- int output_error;
-
- while ( argc > 1 && argv[1][0] == '-' ) {
- if ( !strcmp(argv[1], "--varargs") ) {
- convert_varargs = 1;
- argc--;
- argv++;
- continue;
- }
- if ( !strcmp(argv[1], "--filename") && argc > 2 ) {
- filename = argv[2];
- argc -= 2;
- argv += 2;
- continue;
- }
- fprintf(stderr, "%s: Unrecognized switch: %s\n", program_name,
- argv[1]);
- fprintf(stderr, usage);
- exit(1);
- }
- switch ( argc )
- {
- default:
- fprintf(stderr, usage);
- exit(0);
- case 3:
- output_name = argv[2];
- out = fopen(output_name, "w");
- if ( out == NULL ) {
- fprintf(stderr, "%s: Cannot open output file %s\n",
- program_name, output_name);
- exit(1);
- }
- /* falls through */
- case 2:
- in = fopen(argv[1], "r");
- if ( in == NULL ) {
- fprintf(stderr, "%s: Cannot open input file %s\n",
- program_name, argv[1]);
- exit(1);
- }
- if ( filename == 0 )
- filename = argv[1];
- /* falls through */
- case 1:
- break;
- }
- if ( filename )
- fprintf(out, "#line 1 \"%s\"\n", filename);
- buf = malloc(bufsize);
- if ( buf == NULL )
- {
- fprintf(stderr, "Unable to allocate read buffer!\n");
- exit(1);
- }
- 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(ppdirforward(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);
- if ( output_name ) {
- output_error = ferror(out);
- output_error |= fclose(out);
- } else { /* out == stdout */
- fflush(out);
- output_error = ferror(out);
- }
- if ( output_error ) {
- fprintf(stderr, "%s: error writing to %s\n", program_name,
- (output_name ? output_name : "stdout"));
- exit(1);
- }
- if ( in != stdin )
- fclose(in);
- return 0;
-}
-
-/*
- * Skip forward or backward over one or more preprocessor directives.
- */
-char *
-ppdirforward(p)
- char *p;
-{
- for (; *p == '#'; ++p) {
- for (; *p != '\r' && *p != '\n'; ++p)
- if (*p == 0)
- return p;
- if (*p == '\r' && p[1] == '\n')
- ++p;
- }
- return p;
-}
-char *
-ppdirbackward(p, limit)
- char *p;
- char *limit;
-{
- char *np = p;
-
- for (;; p = --np) {
- if (*np == '\n' && np[-1] == '\r')
- --np;
- for (; np > limit && np[-1] != '\r' && np[-1] != '\n'; --np)
- if (np[-1] == 0)
- return np;
- if (*np != '#')
- return p;
- }
-}
-
-/*
- * Skip over whitespace, comments, and preprocessor directives,
- * in either direction.
- */
-char *
-skipspace(p, dir)
- char *p;
- 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;
-}
-
-/* Scan over a quoted string, in either direction. */
-char *
-scanstring(p, dir)
- char *p;
- int dir;
-{
- for (p += dir; ; p += dir)
- if (*p == '"' && p[-dir] != '\\')
- return p + dir;
-}
-
-/*
- * 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;
-{ char *p = buf;
- char *bend;
- char *endfn;
- int contin;
-
- if ( !isidfirstchar(*p) )
- return 0; /* no name at left margin */
- bend = skipspace(ppdirbackward(buf + strlen(buf) - 1, buf), -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;
- unsigned len = endfn - buf;
-
- while ( (kp = *key) != 0 )
- { if ( strlen(kp) == len && !strncmp(kp, buf, len) )
- return 0; /* name is a keyword */
- key++;
- }
- }
- {
- char *id = p;
- int len;
- /*
- * Check for identifier1(identifier2) and not
- * identifier1(void), or identifier1(identifier2, xxxx).
- */
-
- while ( isidchar(*p) )
- p++;
- len = p - id;
- p = skipspace(p, 1);
- if (*p == ',' ||
- (*p == ')' && (len != 4 || strncmp(id, "void", 4)))
- )
- return 0; /* not a function */
- }
- /*
- * If the last significant character was a ), we need to count
- * parentheses, because it might be part of a formal parameter
- * that is a procedure.
- */
- if (contin > 0) {
- int level = 0;
-
- for (p = skipspace(buf, 1); *p; p = skipspace(p + 1, 1))
- level += (*p == '(' ? 1 : *p == ')' ? -1 : 0);
- if (level > 0)
- contin = -1;
- }
- 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;
- char *p;
- /*
- * The breaks table contains pointers to the beginning and end
- * of each argument.
- */
- 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 == NULL )
- { /* 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 = NULL;
- 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 '/':
- if (p[1] == '*')
- p = skipspace(p, 1) - 1;
- break;
- case '"':
- p = scanstring(p, 1) - 1;
- break;
- default:
- ;
- }
- }
- /* Erase any embedded prototype parameters. */
- if ( lp && rp )
- 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 '/':
- if (p > buf && p[-1] == '*')
- p = skipspace(p, -1) + 1;
- break;
- case '"':
- p = scanstring(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;
-}
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