source: trunk/libjpeg/ansi2knr.c @ 15

Last change on this file since 15 was 15, checked in by Eugene Romanenko, 15 years ago

needed libs update

File size: 22.5 KB
Line 
1/* ansi2knr.c */
2/* Convert ANSI C function definitions to K&R ("traditional C") syntax */
3
4/*
5ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
6WARRANTY.  No author or distributor accepts responsibility to anyone for the
7consequences of using it or for whether it serves any particular purpose or
8works at all, unless he says so in writing.  Refer to the GNU General Public
9License (the "GPL") for full details.
10
11Everyone is granted permission to copy, modify and redistribute ansi2knr,
12but only under the conditions described in the GPL.  A copy of this license
13is supposed to have been given to you along with ansi2knr so you can know
14your rights and responsibilities.  It should be in a file named COPYLEFT.
15[In the IJG distribution, the GPL appears below, not in a separate file.]
16Among other things, the copyright notice and this notice must be preserved
17on all copies.
18
19We explicitly state here what we believe is already implied by the GPL: if
20the ansi2knr program is distributed as a separate set of sources and a
21separate executable file which are aggregated on a storage medium together
22with another program, this in itself does not bring the other program under
23the GPL, nor does the mere fact that such a program or the procedures for
24constructing it invoke the ansi2knr executable bring any other part of the
25program under the GPL.
26*/
27
28/*
29---------- Here is the GNU GPL file COPYLEFT, referred to above ----------
30----- These terms do NOT apply to the JPEG software itself; see README ------
31
32                    GHOSTSCRIPT GENERAL PUBLIC LICENSE
33                    (Clarified 11 Feb 1988)
34
35 Copyright (C) 1988 Richard M. Stallman
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40  The license agreements of most software companies keep you at the
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43that you get the rights we want you to have, we need to make
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46
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48away copies of Ghostscript, that you receive source code or else can get
49it if you want it, that you can change Ghostscript or use pieces of it
50in new free programs, and that you know you can do these things.
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68
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72code as you receive it, in any medium, provided that you conspicuously
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174
175-------------------- End of file COPYLEFT ------------------------------
176*/
177
178/*
179 * Usage:
180        ansi2knr input_file [output_file]
181 * If no output_file is supplied, output goes to stdout.
182 * There are no error messages.
183 *
184 * ansi2knr recognizes function definitions by seeing a non-keyword
185 * identifier at the left margin, followed by a left parenthesis,
186 * with a right parenthesis as the last character on the line,
187 * and with a left brace as the first token on the following line
188 * (ignoring possible intervening comments).
189 * It will recognize a multi-line header provided that no intervening
190 * line ends with a left or right brace or a semicolon.
191 * These algorithms ignore whitespace and comments, except that
192 * the function name must be the first thing on the line.
193 * The following constructs will confuse it:
194 *      - Any other construct that starts at the left margin and
195 *          follows the above syntax (such as a macro or function call).
196 *      - Some macros that tinker with the syntax of the function header.
197 */
198
199/*
200 * The original and principal author of ansi2knr is L. Peter Deutsch
201 * <ghost@aladdin.com>.  Other authors are noted in the change history
202 * that follows (in reverse chronological order):
203        lpd 96-01-21 added code to cope with not HAVE_CONFIG_H and with
204                compilers that don't understand void, as suggested by
205                Tom Lane
206        lpd 96-01-15 changed to require that the first non-comment token
207                on the line following a function header be a left brace,
208                to reduce sensitivity to macros, as suggested by Tom Lane
209                <tgl@sss.pgh.pa.us>
210        lpd 95-06-22 removed #ifndefs whose sole purpose was to define
211                undefined preprocessor symbols as 0; changed all #ifdefs
212                for configuration symbols to #ifs
213        lpd 95-04-05 changed copyright notice to make it clear that
214                including ansi2knr in a program does not bring the entire
215                program under the GPL
216        lpd 94-12-18 added conditionals for systems where ctype macros
217                don't handle 8-bit characters properly, suggested by
218                Francois Pinard <pinard@iro.umontreal.ca>;
219                removed --varargs switch (this is now the default)
220        lpd 94-10-10 removed CONFIG_BROKETS conditional
221        lpd 94-07-16 added some conditionals to help GNU `configure',
222                suggested by Francois Pinard <pinard@iro.umontreal.ca>;
223                properly erase prototype args in function parameters,
224                contributed by Jim Avera <jima@netcom.com>;
225                correct error in writeblanks (it shouldn't erase EOLs)
226        lpd 89-xx-xx original version
227 */
228
229/* Most of the conditionals here are to make ansi2knr work with */
230/* or without the GNU configure machinery. */
231
232#if HAVE_CONFIG_H
233# include <config.h>
234#endif
235
236#include <stdio.h>
237#include <ctype.h>
238
239#if HAVE_CONFIG_H
240
241/*
242   For properly autoconfiguring ansi2knr, use AC_CONFIG_HEADER(config.h).
243   This will define HAVE_CONFIG_H and so, activate the following lines.
244 */
245
246# if STDC_HEADERS || HAVE_STRING_H
247#  include <string.h>
248# else
249#  include <strings.h>
250# endif
251
252#else /* not HAVE_CONFIG_H */
253
254/* Otherwise do it the hard way */
255
256# ifdef BSD
257#  include <strings.h>
258# else
259#  ifdef VMS
260    extern int strlen(), strncmp();
261#  else
262#   include <string.h>
263#  endif
264# endif
265
266#endif /* not HAVE_CONFIG_H */
267
268#if STDC_HEADERS
269# include <stdlib.h>
270#else
271/*
272   malloc and free should be declared in stdlib.h,
273   but if you've got a K&R compiler, they probably aren't.
274 */
275# ifdef MSDOS
276#  include <malloc.h>
277# else
278#  ifdef VMS
279     extern char *malloc();
280     extern void free();
281#  else
282     extern char *malloc();
283     extern int free();
284#  endif
285# endif
286
287#endif
288
289/*
290 * The ctype macros don't always handle 8-bit characters correctly.
291 * Compensate for this here.
292 */
293#ifdef isascii
294#  undef HAVE_ISASCII           /* just in case */
295#  define HAVE_ISASCII 1
296#else
297#endif
298#if STDC_HEADERS || !HAVE_ISASCII
299#  define is_ascii(c) 1
300#else
301#  define is_ascii(c) isascii(c)
302#endif
303
304#define is_space(c) (is_ascii(c) && isspace(c))
305#define is_alpha(c) (is_ascii(c) && isalpha(c))
306#define is_alnum(c) (is_ascii(c) && isalnum(c))
307
308/* Scanning macros */
309#define isidchar(ch) (is_alnum(ch) || (ch) == '_')
310#define isidfirstchar(ch) (is_alpha(ch) || (ch) == '_')
311
312/* Forward references */
313char *skipspace();
314int writeblanks();
315int test1();
316int convert1();
317
318/* The main program */
319int
320main(argc, argv)
321    int argc;
322    char *argv[];
323{       FILE *in, *out;
324#define bufsize 5000                    /* arbitrary size */
325        char *buf;
326        char *line;
327        char *more;
328        /*
329         * In previous versions, ansi2knr recognized a --varargs switch.
330         * If this switch was supplied, ansi2knr would attempt to convert
331         * a ... argument to va_alist and va_dcl; if this switch was not
332         * supplied, ansi2knr would simply drop any such arguments.
333         * Now, ansi2knr always does this conversion, and we only
334         * check for this switch for backward compatibility.
335         */
336        int convert_varargs = 1;
337
338        if ( argc > 1 && argv[1][0] == '-' )
339          {     if ( !strcmp(argv[1], "--varargs") )
340                  {     convert_varargs = 1;
341                        argc--;
342                        argv++;
343                  }
344                else
345                  {     fprintf(stderr, "Unrecognized switch: %s\n", argv[1]);
346                        exit(1);
347                  }
348          }
349        switch ( argc )
350           {
351        default:
352                printf("Usage: ansi2knr input_file [output_file]\n");
353                exit(0);
354        case 2:
355                out = stdout;
356                break;
357        case 3:
358                out = fopen(argv[2], "w");
359                if ( out == NULL )
360                   {    fprintf(stderr, "Cannot open output file %s\n", argv[2]);
361                        exit(1);
362                   }
363           }
364        in = fopen(argv[1], "r");
365        if ( in == NULL )
366           {    fprintf(stderr, "Cannot open input file %s\n", argv[1]);
367                exit(1);
368           }
369        fprintf(out, "#line 1 \"%s\"\n", argv[1]);
370        buf = malloc(bufsize);
371        line = buf;
372        while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
373           {
374test:           line += strlen(line);
375                switch ( test1(buf) )
376                   {
377                case 2:                 /* a function header */
378                        convert1(buf, out, 1, convert_varargs);
379                        break;
380                case 1:                 /* a function */
381                        /* Check for a { at the start of the next line. */
382                        more = ++line;
383f:                      if ( line >= buf + (bufsize - 1) ) /* overflow check */
384                          goto wl;
385                        if ( fgets(line, (unsigned)(buf + bufsize - line), in) == NULL )
386                          goto wl;
387                        switch ( *skipspace(more, 1) )
388                          {
389                          case '{':
390                            /* Definitely a function header. */
391                            convert1(buf, out, 0, convert_varargs);
392                            fputs(more, out);
393                            break;
394                          case 0:
395                            /* The next line was blank or a comment: */
396                            /* keep scanning for a non-comment. */
397                            line += strlen(line);
398                            goto f;
399                          default:
400                            /* buf isn't a function header, but */
401                            /* more might be. */
402                            fputs(buf, out);
403                            strcpy(buf, more);
404                            line = buf;
405                            goto test;
406                          }
407                        break;
408                case -1:                /* maybe the start of a function */
409                        if ( line != buf + (bufsize - 1) ) /* overflow check */
410                          continue;
411                        /* falls through */
412                default:                /* not a function */
413wl:                     fputs(buf, out);
414                        break;
415                   }
416                line = buf;
417           }
418        if ( line != buf )
419          fputs(buf, out);
420        free(buf);
421        fclose(out);
422        fclose(in);
423        return 0;
424}
425
426/* Skip over space and comments, in either direction. */
427char *
428skipspace(p, dir)
429    register char *p;
430    register int dir;                   /* 1 for forward, -1 for backward */
431{       for ( ; ; )
432           {    while ( is_space(*p) )
433                  p += dir;
434                if ( !(*p == '/' && p[dir] == '*') )
435                  break;
436                p += dir;  p += dir;
437                while ( !(*p == '*' && p[dir] == '/') )
438                   {    if ( *p == 0 )
439                          return p;     /* multi-line comment?? */
440                        p += dir;
441                   }
442                p += dir;  p += dir;
443           }
444        return p;
445}
446
447/*
448 * Write blanks over part of a string.
449 * Don't overwrite end-of-line characters.
450 */
451int
452writeblanks(start, end)
453    char *start;
454    char *end;
455{       char *p;
456        for ( p = start; p < end; p++ )
457          if ( *p != '\r' && *p != '\n' )
458            *p = ' ';
459        return 0;
460}
461
462/*
463 * Test whether the string in buf is a function definition.
464 * The string may contain and/or end with a newline.
465 * Return as follows:
466 *      0 - definitely not a function definition;
467 *      1 - definitely a function definition;
468 *      2 - definitely a function prototype (NOT USED);
469 *      -1 - may be the beginning of a function definition,
470 *              append another line and look again.
471 * The reason we don't attempt to convert function prototypes is that
472 * Ghostscript's declaration-generating macros look too much like
473 * prototypes, and confuse the algorithms.
474 */
475int
476test1(buf)
477    char *buf;
478{       register char *p = buf;
479        char *bend;
480        char *endfn;
481        int contin;
482
483        if ( !isidfirstchar(*p) )
484          return 0;             /* no name at left margin */
485        bend = skipspace(buf + strlen(buf) - 1, -1);
486        switch ( *bend )
487           {
488           case ';': contin = 0 /*2*/; break;
489           case ')': contin = 1; break;
490           case '{': return 0;          /* not a function */
491           case '}': return 0;          /* not a function */
492           default: contin = -1;
493           }
494        while ( isidchar(*p) )
495          p++;
496        endfn = p;
497        p = skipspace(p, 1);
498        if ( *p++ != '(' )
499          return 0;             /* not a function */
500        p = skipspace(p, 1);
501        if ( *p == ')' )
502          return 0;             /* no parameters */
503        /* Check that the apparent function name isn't a keyword. */
504        /* We only need to check for keywords that could be followed */
505        /* by a left parenthesis (which, unfortunately, is most of them). */
506           {    static char *words[] =
507                   {    "asm", "auto", "case", "char", "const", "double",
508                        "extern", "float", "for", "if", "int", "long",
509                        "register", "return", "short", "signed", "sizeof",
510                        "static", "switch", "typedef", "unsigned",
511                        "void", "volatile", "while", 0
512                   };
513                char **key = words;
514                char *kp;
515                int len = endfn - buf;
516
517                while ( (kp = *key) != 0 )
518                   {    if ( strlen(kp) == len && !strncmp(kp, buf, len) )
519                          return 0;     /* name is a keyword */
520                        key++;
521                   }
522           }
523        return contin;
524}
525
526/* Convert a recognized function definition or header to K&R syntax. */
527int
528convert1(buf, out, header, convert_varargs)
529    char *buf;
530    FILE *out;
531    int header;                 /* Boolean */
532    int convert_varargs;        /* Boolean */
533{       char *endfn;
534        register char *p;
535        char **breaks;
536        unsigned num_breaks = 2;        /* for testing */
537        char **btop;
538        char **bp;
539        char **ap;
540        char *vararg = 0;
541
542        /* Pre-ANSI implementations don't agree on whether strchr */
543        /* is called strchr or index, so we open-code it here. */
544        for ( endfn = buf; *(endfn++) != '('; )
545          ;
546top:    p = endfn;
547        breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
548        if ( breaks == 0 )
549           {    /* Couldn't allocate break table, give up */
550                fprintf(stderr, "Unable to allocate break table!\n");
551                fputs(buf, out);
552                return -1;
553           }
554        btop = breaks + num_breaks * 2 - 2;
555        bp = breaks;
556        /* Parse the argument list */
557        do
558           {    int level = 0;
559                char *lp = NULL;
560                char *rp;
561                char *end = NULL;
562
563                if ( bp >= btop )
564                   {    /* Filled up break table. */
565                        /* Allocate a bigger one and start over. */
566                        free((char *)breaks);
567                        num_breaks <<= 1;
568                        goto top;
569                   }
570                *bp++ = p;
571                /* Find the end of the argument */
572                for ( ; end == NULL; p++ )
573                   {    switch(*p)
574                           {
575                           case ',':
576                                if ( !level ) end = p;
577                                break;
578                           case '(':
579                                if ( !level ) lp = p;
580                                level++;
581                                break;
582                           case ')':
583                                if ( --level < 0 ) end = p;
584                                else rp = p;
585                                break;
586                           case '/':
587                                p = skipspace(p, 1) - 1;
588                                break;
589                           default:
590                                ;
591                           }
592                   }
593                /* Erase any embedded prototype parameters. */
594                if ( lp )
595                  writeblanks(lp + 1, rp);
596                p--;                    /* back up over terminator */
597                /* Find the name being declared. */
598                /* This is complicated because of procedure and */
599                /* array modifiers. */
600                for ( ; ; )
601                   {    p = skipspace(p - 1, -1);
602                        switch ( *p )
603                           {
604                           case ']':    /* skip array dimension(s) */
605                           case ')':    /* skip procedure args OR name */
606                           {    int level = 1;
607                                while ( level )
608                                 switch ( *--p )
609                                   {
610                                   case ']': case ')': level++; break;
611                                   case '[': case '(': level--; break;
612                                   case '/': p = skipspace(p, -1) + 1; break;
613                                   default: ;
614                                   }
615                           }
616                                if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
617                                   {    /* We found the name being declared */
618                                        while ( !isidfirstchar(*p) )
619                                          p = skipspace(p, 1) + 1;
620                                        goto found;
621                                   }
622                                break;
623                           default:
624                                goto found;
625                           }
626                   }
627found:          if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
628                  {     if ( convert_varargs )
629                          {     *bp++ = "va_alist";
630                                vararg = p-2;
631                          }
632                        else
633                          {     p++;
634                                if ( bp == breaks + 1 ) /* sole argument */
635                                  writeblanks(breaks[0], p);
636                                else
637                                  writeblanks(bp[-1] - 1, p);
638                                bp--;
639                          }
640                   }
641                else
642                   {    while ( isidchar(*p) ) p--;
643                        *bp++ = p+1;
644                   }
645                p = end;
646           }
647        while ( *p++ == ',' );
648        *bp = p;
649        /* Make a special check for 'void' arglist */
650        if ( bp == breaks+2 )
651           {    p = skipspace(breaks[0], 1);
652                if ( !strncmp(p, "void", 4) )
653                   {    p = skipspace(p+4, 1);
654                        if ( p == breaks[2] - 1 )
655                           {    bp = breaks;    /* yup, pretend arglist is empty */
656                                writeblanks(breaks[0], p + 1);
657                           }
658                   }
659           }
660        /* Put out the function name and left parenthesis. */
661        p = buf;
662        while ( p != endfn ) putc(*p, out), p++;
663        /* Put out the declaration. */
664        if ( header )
665          {     fputs(");", out);
666                for ( p = breaks[0]; *p; p++ )
667                  if ( *p == '\r' || *p == '\n' )
668                    putc(*p, out);
669          }
670        else
671          {     for ( ap = breaks+1; ap < bp; ap += 2 )
672                  {     p = *ap;
673                        while ( isidchar(*p) )
674                          putc(*p, out), p++;
675                        if ( ap < bp - 1 )
676                          fputs(", ", out);
677                  }
678                fputs(")  ", out);
679                /* Put out the argument declarations */
680                for ( ap = breaks+2; ap <= bp; ap += 2 )
681                  (*ap)[-1] = ';';
682                if ( vararg != 0 )
683                  {     *vararg = 0;
684                        fputs(breaks[0], out);          /* any prior args */
685                        fputs("va_dcl", out);           /* the final arg */
686                        fputs(bp[0], out);
687                  }
688                else
689                  fputs(breaks[0], out);
690          }
691        free((char *)breaks);
692        return 0;
693}
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