préprocesseur pour nettoyer code

**J4e8a16n** · 04/06/2009, 23h27

Bonjour à tous,

J'ai trouvé ceci:
http://www.cs.tut.fi/~jkorpela/html/cpre.html

Je l'ai utilisé pour enlever les commentaires d'un code à soumettre mais gcc me met des dizaines de lignes de t plus:
gcc -E -x c -P -o out.txt ttt.c

[CODE]typedef unsigned int size_t;
typedef short unsigned int wchar_t;
void* __attribute__((__cdecl__)) __attribute__ ((__nothrow__)) memchr (const void*, int, size_t) __attribute__ ((__pure__));
etc.
CODE]

Y a-t-il de la documentation simple là-dessus?

**matafan** · 05/06/2009, 13h30

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man gcc
[...]
       -E  Stop after the preprocessing stage; do not run the compiler proper.
           The output is in the form of preprocessed source code, which is
           sent to the standard output.
[...]

**J4e8a16n** · 05/06/2009, 14h48

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--target-help            Display target specific command line options

gcc --E-help
gcc: no input files

ne fonctionne pas.

**plxpy** · 05/06/2009, 17h46

Comme le dit le message de Matafan, l'option -E de gcc n'effectue que la phase de "preprocessing" (travail du préprocesseur). Sur la sortie standard, tu obtiendras ce qui est réellement en entrée du compilateur. Par contre, l'option -E ne s'utilise pas avec l'option -o qui permet de spécifier le nom de l'exécutable en sortie.

Après passage dans le préprocesseur, tes commentaires disparaitront mais les "lignes en plus" que tu vois ne sont que l'exploitation (l' "expansion") de tous les #include qui se trouvent dans ton source, des macros, etc...

Fais l'expérience sur le fichier "rien.c" suivant :

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#include <stdio.h>
int main(int argc,char *argv[])
{
   exit(0);
}

en tapant "gcc -E rien.c"

et tu obtiendras, sur la sortie standard, un tas de lignes, essentiellement le contenu de stdio.h (résultat sous Ubuntu):

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# 1 "rien.c"
# 1 "<interne>"
# 1 "<command-line>"
# 1 "rien.c"
# 1 "/usr/include/stdio.h" 1 3 4
# 28 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/features.h" 1 3 4
# 330 "/usr/include/features.h" 3 4
# 1 "/usr/include/sys/cdefs.h" 1 3 4
# 348 "/usr/include/sys/cdefs.h" 3 4
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 349 "/usr/include/sys/cdefs.h" 2 3 4
# 331 "/usr/include/features.h" 2 3 4
# 354 "/usr/include/features.h" 3 4
# 1 "/usr/include/gnu/stubs.h" 1 3 4
 
 
 
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 5 "/usr/include/gnu/stubs.h" 2 3 4
 
 
# 1 "/usr/include/gnu/stubs-32.h" 1 3 4
# 8 "/usr/include/gnu/stubs.h" 2 3 4
# 355 "/usr/include/features.h" 2 3 4
# 29 "/usr/include/stdio.h" 2 3 4
 
 
 
 
 
# 1 "/usr/lib/gcc/i486-linux-gnu/4.3.2/include/stddef.h" 1 3 4
# 214 "/usr/lib/gcc/i486-linux-gnu/4.3.2/include/stddef.h" 3 4
typedef unsigned int size_t;
# 35 "/usr/include/stdio.h" 2 3 4
 
# 1 "/usr/include/bits/types.h" 1 3 4
# 28 "/usr/include/bits/types.h" 3 4
# 1 "/usr/include/bits/wordsize.h" 1 3 4
# 29 "/usr/include/bits/types.h" 2 3 4
 
 
typedef unsigned char __u_char;
typedef unsigned short int __u_short;
typedef unsigned int __u_int;
typedef unsigned long int __u_long;
 
 
typedef signed char __int8_t;
typedef unsigned char __uint8_t;
typedef signed short int __int16_t;
typedef unsigned short int __uint16_t;
typedef signed int __int32_t;
typedef unsigned int __uint32_t;
 
 
 
 
__extension__ typedef signed long long int __int64_t;
__extension__ typedef unsigned long long int __uint64_t;
 
 
 
 
 
 
 
__extension__ typedef long long int __quad_t;
__extension__ typedef unsigned long long int __u_quad_t;
# 131 "/usr/include/bits/types.h" 3 4
# 1 "/usr/include/bits/typesizes.h" 1 3 4
# 132 "/usr/include/bits/types.h" 2 3 4
 
 
__extension__ typedef __u_quad_t __dev_t;
__extension__ typedef unsigned int __uid_t;
__extension__ typedef unsigned int __gid_t;
__extension__ typedef unsigned long int __ino_t;
__extension__ typedef __u_quad_t __ino64_t;
__extension__ typedef unsigned int __mode_t;
__extension__ typedef unsigned int __nlink_t;
__extension__ typedef long int __off_t;
__extension__ typedef __quad_t __off64_t;
__extension__ typedef int __pid_t;
__extension__ typedef struct { int __val[2]; } __fsid_t;
__extension__ typedef long int __clock_t;
__extension__ typedef unsigned long int __rlim_t;
__extension__ typedef __u_quad_t __rlim64_t;
__extension__ typedef unsigned int __id_t;
__extension__ typedef long int __time_t;
__extension__ typedef unsigned int __useconds_t;
__extension__ typedef long int __suseconds_t;
 
__extension__ typedef int __daddr_t;
__extension__ typedef long int __swblk_t;
__extension__ typedef int __key_t;
 
 
__extension__ typedef int __clockid_t;
 
 
__extension__ typedef void * __timer_t;
 
 
__extension__ typedef long int __blksize_t;
 
 
 
 
__extension__ typedef long int __blkcnt_t;
__extension__ typedef __quad_t __blkcnt64_t;
 
 
__extension__ typedef unsigned long int __fsblkcnt_t;
__extension__ typedef __u_quad_t __fsblkcnt64_t;
 
 
__extension__ typedef unsigned long int __fsfilcnt_t;
__extension__ typedef __u_quad_t __fsfilcnt64_t;
 
__extension__ typedef int __ssize_t;
 
 
 
typedef __off64_t __loff_t;
typedef __quad_t *__qaddr_t;
typedef char *__caddr_t;
 
 
__extension__ typedef int __intptr_t;
 
 
__extension__ typedef unsigned int __socklen_t;
# 37 "/usr/include/stdio.h" 2 3 4
# 45 "/usr/include/stdio.h" 3 4
struct _IO_FILE;
 
 
 
typedef struct _IO_FILE FILE;
 
 
 
 
 
# 65 "/usr/include/stdio.h" 3 4
typedef struct _IO_FILE __FILE;
# 75 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/libio.h" 1 3 4
# 32 "/usr/include/libio.h" 3 4
# 1 "/usr/include/_G_config.h" 1 3 4
# 15 "/usr/include/_G_config.h" 3 4
# 1 "/usr/lib/gcc/i486-linux-gnu/4.3.2/include/stddef.h" 1 3 4
# 16 "/usr/include/_G_config.h" 2 3 4
 
 
 
 
# 1 "/usr/include/wchar.h" 1 3 4
# 78 "/usr/include/wchar.h" 3 4
typedef struct
{
  int __count;
  union
  {
 
    unsigned int __wch;
 
 
 
    char __wchb[4];
  } __value;
} __mbstate_t;
# 21 "/usr/include/_G_config.h" 2 3 4
 
typedef struct
{
  __off_t __pos;
  __mbstate_t __state;
} _G_fpos_t;
typedef struct
{
  __off64_t __pos;
  __mbstate_t __state;
} _G_fpos64_t;
# 53 "/usr/include/_G_config.h" 3 4
typedef int _G_int16_t __attribute__ ((__mode__ (__HI__)));
typedef int _G_int32_t __attribute__ ((__mode__ (__SI__)));
typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__)));
typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__)));
# 33 "/usr/include/libio.h" 2 3 4
# 53 "/usr/include/libio.h" 3 4
# 1 "/usr/lib/gcc/i486-linux-gnu/4.3.2/include/stdarg.h" 1 3 4
# 43 "/usr/lib/gcc/i486-linux-gnu/4.3.2/include/stdarg.h" 3 4
typedef __builtin_va_list __gnuc_va_list;
# 54 "/usr/include/libio.h" 2 3 4
# 170 "/usr/include/libio.h" 3 4
struct _IO_jump_t; struct _IO_FILE;
# 180 "/usr/include/libio.h" 3 4
typedef void _IO_lock_t;
 
 
 
 
 
struct _IO_marker {
  struct _IO_marker *_next;
  struct _IO_FILE *_sbuf;
 
 
 
  int _pos;
# 203 "/usr/include/libio.h" 3 4
};
 
 
enum __codecvt_result
{
  __codecvt_ok,
  __codecvt_partial,
  __codecvt_error,
  __codecvt_noconv
};
# 271 "/usr/include/libio.h" 3 4
struct _IO_FILE {
  int _flags;
 
 
 
 
  char* _IO_read_ptr;
  char* _IO_read_end;
  char* _IO_read_base;
  char* _IO_write_base;
  char* _IO_write_ptr;
  char* _IO_write_end;
  char* _IO_buf_base;
  char* _IO_buf_end;
 
  char *_IO_save_base;
  char *_IO_backup_base;
  char *_IO_save_end;
 
  struct _IO_marker *_markers;
 
  struct _IO_FILE *_chain;
 
  int _fileno;
 
 
 
  int _flags2;
 
  __off_t _old_offset;
 
 
 
  unsigned short _cur_column;
  signed char _vtable_offset;
  char _shortbuf[1];
 
 
 
  _IO_lock_t *_lock;
# 319 "/usr/include/libio.h" 3 4
  __off64_t _offset;
# 328 "/usr/include/libio.h" 3 4
  void *__pad1;
  void *__pad2;
  void *__pad3;
  void *__pad4;
  size_t __pad5;
 
  int _mode;
 
  char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
 
};
 
 
typedef struct _IO_FILE _IO_FILE;
 
 
struct _IO_FILE_plus;
 
extern struct _IO_FILE_plus _IO_2_1_stdin_;
extern struct _IO_FILE_plus _IO_2_1_stdout_;
extern struct _IO_FILE_plus _IO_2_1_stderr_;
# 364 "/usr/include/libio.h" 3 4
typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
 
 
 
 
 
 
 
typedef __ssize_t __io_write_fn (void *__cookie, __const char *__buf,
     size_t __n);
 
 
 
 
 
 
 
typedef int __io_seek_fn (void *__cookie, __off64_t *__pos, int __w);
 
 
typedef int __io_close_fn (void *__cookie);
# 416 "/usr/include/libio.h" 3 4
extern int __underflow (_IO_FILE *);
extern int __uflow (_IO_FILE *);
extern int __overflow (_IO_FILE *, int);
# 458 "/usr/include/libio.h" 3 4
extern int _IO_getc (_IO_FILE *__fp);
extern int _IO_putc (int __c, _IO_FILE *__fp);
extern int _IO_feof (_IO_FILE *__fp) __attribute__ ((__nothrow__));
extern int _IO_ferror (_IO_FILE *__fp) __attribute__ ((__nothrow__));
 
extern int _IO_peekc_locked (_IO_FILE *__fp);
 
 
 
 
 
extern void _IO_flockfile (_IO_FILE *) __attribute__ ((__nothrow__));
extern void _IO_funlockfile (_IO_FILE *) __attribute__ ((__nothrow__));
extern int _IO_ftrylockfile (_IO_FILE *) __attribute__ ((__nothrow__));
# 488 "/usr/include/libio.h" 3 4
extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
   __gnuc_va_list, int *__restrict);
extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
    __gnuc_va_list);
extern __ssize_t _IO_padn (_IO_FILE *, int, __ssize_t);
extern size_t _IO_sgetn (_IO_FILE *, void *, size_t);
 
extern __off64_t _IO_seekoff (_IO_FILE *, __off64_t, int, int);
extern __off64_t _IO_seekpos (_IO_FILE *, __off64_t, int);
 
extern void _IO_free_backup_area (_IO_FILE *) __attribute__ ((__nothrow__));
# 76 "/usr/include/stdio.h" 2 3 4
# 89 "/usr/include/stdio.h" 3 4
 
 
typedef _G_fpos_t fpos_t;
 
 
 
 
# 141 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/bits/stdio_lim.h" 1 3 4
# 142 "/usr/include/stdio.h" 2 3 4
 
 
 
extern struct _IO_FILE *stdin;
extern struct _IO_FILE *stdout;
extern struct _IO_FILE *stderr;
 
 
 
 
 
 
 
extern int remove (__const char *__filename) __attribute__ ((__nothrow__));
 
extern int rename (__const char *__old, __const char *__new) __attribute__ ((__nothrow__));
 
 
 
 
 
 
 
 
 
 
 
 
 
 
extern FILE *tmpfile (void) ;
# 186 "/usr/include/stdio.h" 3 4
extern char *tmpnam (char *__s) __attribute__ ((__nothrow__)) ;
 
 
 
 
 
extern char *tmpnam_r (char *__s) __attribute__ ((__nothrow__)) ;
# 204 "/usr/include/stdio.h" 3 4
extern char *tempnam (__const char *__dir, __const char *__pfx)
     __attribute__ ((__nothrow__)) __attribute__ ((__malloc__)) ;
 
 
 
 
 
 
 
 
extern int fclose (FILE *__stream);
 
 
 
 
extern int fflush (FILE *__stream);
 
# 229 "/usr/include/stdio.h" 3 4
extern int fflush_unlocked (FILE *__stream);
# 243 "/usr/include/stdio.h" 3 4
 
 
 
 
 
 
extern FILE *fopen (__const char *__restrict __filename,
      __const char *__restrict __modes) ;
 
 
 
 
extern FILE *freopen (__const char *__restrict __filename,
        __const char *__restrict __modes,
        FILE *__restrict __stream) ;
# 272 "/usr/include/stdio.h" 3 4
 
# 283 "/usr/include/stdio.h" 3 4
extern FILE *fdopen (int __fd, __const char *__modes) __attribute__ ((__nothrow__)) ;
# 304 "/usr/include/stdio.h" 3 4
 
 
 
extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __attribute__ ((__nothrow__));
 
 
 
extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
      int __modes, size_t __n) __attribute__ ((__nothrow__));
 
 
 
 
 
extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
         size_t __size) __attribute__ ((__nothrow__));
 
 
extern void setlinebuf (FILE *__stream) __attribute__ ((__nothrow__));
 
 
 
 
 
 
 
 
extern int fprintf (FILE *__restrict __stream,
      __const char *__restrict __format, ...);
 
 
 
 
extern int printf (__const char *__restrict __format, ...);
 
extern int sprintf (char *__restrict __s,
      __const char *__restrict __format, ...) __attribute__ ((__nothrow__));
 
 
 
 
 
extern int vfprintf (FILE *__restrict __s, __const char *__restrict __format,
       __gnuc_va_list __arg);
 
 
 
 
extern int vprintf (__const char *__restrict __format, __gnuc_va_list __arg);
 
extern int vsprintf (char *__restrict __s, __const char *__restrict __format,
       __gnuc_va_list __arg) __attribute__ ((__nothrow__));
 
 
 
 
 
extern int snprintf (char *__restrict __s, size_t __maxlen,
       __const char *__restrict __format, ...)
     __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 4)));
 
extern int vsnprintf (char *__restrict __s, size_t __maxlen,
        __const char *__restrict __format, __gnuc_va_list __arg)
     __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 0)));
 
# 398 "/usr/include/stdio.h" 3 4
 
 
 
 
 
extern int fscanf (FILE *__restrict __stream,
     __const char *__restrict __format, ...) ;
 
 
 
 
extern int scanf (__const char *__restrict __format, ...) ;
 
extern int sscanf (__const char *__restrict __s,
     __const char *__restrict __format, ...) __attribute__ ((__nothrow__));
# 441 "/usr/include/stdio.h" 3 4
 
# 504 "/usr/include/stdio.h" 3 4
 
 
 
 
 
extern int fgetc (FILE *__stream);
extern int getc (FILE *__stream);
 
 
 
 
 
extern int getchar (void);
 
# 528 "/usr/include/stdio.h" 3 4
extern int getc_unlocked (FILE *__stream);
extern int getchar_unlocked (void);
# 539 "/usr/include/stdio.h" 3 4
extern int fgetc_unlocked (FILE *__stream);
 
 
 
 
 
 
 
 
 
 
 
extern int fputc (int __c, FILE *__stream);
extern int putc (int __c, FILE *__stream);
 
 
 
 
 
extern int putchar (int __c);
 
# 572 "/usr/include/stdio.h" 3 4
extern int fputc_unlocked (int __c, FILE *__stream);
 
 
 
 
 
 
 
extern int putc_unlocked (int __c, FILE *__stream);
extern int putchar_unlocked (int __c);
 
 
 
 
 
 
extern int getw (FILE *__stream);
 
 
extern int putw (int __w, FILE *__stream);
 
 
 
 
 
 
 
 
extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
     ;
 
 
 
 
 
 
extern char *gets (char *__s) ;
 
# 653 "/usr/include/stdio.h" 3 4
 
 
 
 
 
extern int fputs (__const char *__restrict __s, FILE *__restrict __stream);
 
 
 
 
 
extern int puts (__const char *__s);
 
 
 
 
 
 
extern int ungetc (int __c, FILE *__stream);
 
 
 
 
 
 
extern size_t fread (void *__restrict __ptr, size_t __size,
       size_t __n, FILE *__restrict __stream) ;
 
 
 
 
extern size_t fwrite (__const void *__restrict __ptr, size_t __size,
        size_t __n, FILE *__restrict __s) ;
 
# 706 "/usr/include/stdio.h" 3 4
extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
         size_t __n, FILE *__restrict __stream) ;
extern size_t fwrite_unlocked (__const void *__restrict __ptr, size_t __size,
          size_t __n, FILE *__restrict __stream) ;
 
 
 
 
 
 
 
 
extern int fseek (FILE *__stream, long int __off, int __whence);
 
 
 
 
extern long int ftell (FILE *__stream) ;
 
 
 
 
extern void rewind (FILE *__stream);
 
# 742 "/usr/include/stdio.h" 3 4
extern int fseeko (FILE *__stream, __off_t __off, int __whence);
 
 
 
 
extern __off_t ftello (FILE *__stream) ;
# 761 "/usr/include/stdio.h" 3 4
 
 
 
 
 
 
extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);
 
 
 
 
extern int fsetpos (FILE *__stream, __const fpos_t *__pos);
# 784 "/usr/include/stdio.h" 3 4
 
# 793 "/usr/include/stdio.h" 3 4
 
 
extern void clearerr (FILE *__stream) __attribute__ ((__nothrow__));
 
extern int feof (FILE *__stream) __attribute__ ((__nothrow__)) ;
 
extern int ferror (FILE *__stream) __attribute__ ((__nothrow__)) ;
 
 
 
 
extern void clearerr_unlocked (FILE *__stream) __attribute__ ((__nothrow__));
extern int feof_unlocked (FILE *__stream) __attribute__ ((__nothrow__)) ;
extern int ferror_unlocked (FILE *__stream) __attribute__ ((__nothrow__)) ;
 
 
 
 
 
 
 
 
extern void perror (__const char *__s);
 
 
 
 
 
 
# 1 "/usr/include/bits/sys_errlist.h" 1 3 4
# 27 "/usr/include/bits/sys_errlist.h" 3 4
extern int sys_nerr;
extern __const char *__const sys_errlist[];
# 823 "/usr/include/stdio.h" 2 3 4
 
 
 
 
extern int fileno (FILE *__stream) __attribute__ ((__nothrow__)) ;
 
 
 
 
extern int fileno_unlocked (FILE *__stream) __attribute__ ((__nothrow__)) ;
# 842 "/usr/include/stdio.h" 3 4
extern FILE *popen (__const char *__command, __const char *__modes) ;
 
 
 
 
 
extern int pclose (FILE *__stream);
 
 
 
 
 
extern char *ctermid (char *__s) __attribute__ ((__nothrow__));
# 882 "/usr/include/stdio.h" 3 4
extern void flockfile (FILE *__stream) __attribute__ ((__nothrow__));
 
 
 
extern int ftrylockfile (FILE *__stream) __attribute__ ((__nothrow__)) ;
 
 
extern void funlockfile (FILE *__stream) __attribute__ ((__nothrow__));
# 912 "/usr/include/stdio.h" 3 4
 
# 2 "rien.c" 2
int main(int argc,char *argv[])
{
   exit(0);
}

Si dans ton code, tu utilises des include qui ne sont pas situés dans le répertoire standard (/usr/include), il faut utiliser l'option -I de gcc, comme si tu compilais réellement ton source pour en faire un exécutable.

Et, pour en revenir à ton premier soucis, celui d'enlever les commentaires, l'utilisation du préprocesseur n'est pas la solution !

**J4e8a16n** · 05/06/2009, 18h23

Merci à vous deux,

Comme je n'ai pas envie de chercher, je suis en train de me créer ma ptit appplication en ce sens.

JPD

préprocesseur pour nettoyer code

C

Vue hybride

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