glob.c

压缩包中包含LINUX下多个命令的源码

/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/* AIX requires this to be the first thing in the file.  */
#if defined (_AIX) && !defined (__GNUC__)
 #pragma alloca
#endif

#ifdef	HAVE_CONFIG_H
#include <config.h>
#endif

/* Enable GNU extensions in glob.h.  */
#ifndef _GNU_SOURCE
#define	_GNU_SOURCE	1
#endif

#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>


/* Comment out all this code if we are using the GNU C Library, and are not
   actually compiling the library itself.  This code is part of the GNU C
   Library, but also included in many other GNU distributions.  Compiling
   and linking in this code is a waste when using the GNU C library
   (especially if it is a shared library).  Rather than having every GNU
   program understand `configure --with-gnu-libc' and omit the object files,
   it is simpler to just do this in the source for each such file.  */

#define GLOB_INTERFACE_VERSION 1
#if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
#include <gnu-versions.h>
#if _GNU_GLOB_INTERFACE_VERSION == GLOB_INTERFACE_VERSION
#define ELIDE_CODE
#endif
#endif

#ifndef ELIDE_CODE

#ifdef	STDC_HEADERS
#include <stddef.h>
#endif

#ifdef	HAVE_UNISTD_H
#include <unistd.h>
#ifndef POSIX
#ifdef	_POSIX_VERSION
#define	POSIX
#endif
#endif
#endif

#if !defined (_AMIGA) && !defined (VMS) && !defined(WIN32)
#include <pwd.h>
#endif

#if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
extern int errno;
#endif

#ifndef	NULL
#define	NULL	0
#endif


#if defined (HAVE_DIRENT_H) || defined (__GNU_LIBRARY__)
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
# ifdef HAVE_VMSDIR_H
#  include "vmsdir.h"
# endif /* HAVE_VMSDIR_H */
#endif


/* In GNU systems, <dirent.h> defines this macro for us.  */
#ifdef _D_NAMLEN
#undef NAMLEN
#define NAMLEN(d) _D_NAMLEN(d)
#endif


#if (defined (POSIX) || defined (WIN32)) && !defined (__GNU_LIBRARY__)
/* Posix does not require that the d_ino field be present, and some
   systems do not provide it. */
#define REAL_DIR_ENTRY(dp) 1
#else
#define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
#endif /* POSIX */

#if	(defined (STDC_HEADERS) || defined (__GNU_LIBRARY__))
#include <stdlib.h>
#include <string.h>
#define	ANSI_STRING
#else	/* No standard headers.  */

extern char *getenv ();

#ifdef HAVE_STRING_H
#include <string.h>
#define	ANSI_STRING
#else
#include <strings.h>
#endif
#ifdef	HAVE_MEMORY_H
#include <memory.h>
#endif

extern char *malloc (), *realloc ();
extern void free ();

extern void qsort ();
extern void abort (), exit ();

#endif	/* Standard headers.  */

#ifndef	ANSI_STRING

#ifndef	bzero
extern void bzero ();
#endif
#ifndef	bcopy
extern void bcopy ();
#endif

#define	memcpy(d, s, n)	bcopy ((s), (d), (n))
#define	strrchr	rindex
/* memset is only used for zero here, but let's be paranoid.  */
#define	memset(s, better_be_zero, n) \
  ((void) ((better_be_zero) == 0 ? (bzero((s), (n)), 0) : (abort(), 0)))
#endif	/* Not ANSI_STRING.  */

#ifndef	HAVE_STRCOLL
#define	strcoll	strcmp
#endif


#ifndef	__GNU_LIBRARY__
#ifdef	__GNUC__
__inline
#endif
#ifndef __SASC
#ifdef WIN32
static void *
#else
static char *
#endif
my_realloc (p, n)
     char *p;
     unsigned int n;
{
  /* These casts are the for sake of the broken Ultrix compiler,
     which warns of illegal pointer combinations otherwise.  */
  if (p == NULL)
    return (char *) malloc (n);
  return (char *) realloc (p, n);
}
#define	realloc	my_realloc
#endif /* __SASC */
#endif /* __GNU_LIBRARY__ */


#if	!defined(__alloca) && !defined(__GNU_LIBRARY__)

#ifdef	__GNUC__
#undef	alloca
#define	alloca(n)	__builtin_alloca (n)
#else	/* Not GCC.  */
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#else	/* Not HAVE_ALLOCA_H.  */
#ifndef	_AIX
#ifdef WIN32
#include <malloc.h>
#else
extern char *alloca ();
#endif /* WIN32 */
#endif	/* Not _AIX.  */
#endif	/* sparc or HAVE_ALLOCA_H.  */
#endif	/* GCC.  */

#define	__alloca	alloca

#endif

#ifndef __GNU_LIBRARY__
#define __stat stat
#ifdef STAT_MACROS_BROKEN
#undef S_ISDIR
#endif
#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif
#endif

#ifndef	STDC_HEADERS
#undef	size_t
#define	size_t	unsigned int
#endif

/* Some system header files erroneously define these.
   We want our own definitions from <fnmatch.h> to take precedence.  */
#undef	FNM_PATHNAME
#undef	FNM_NOESCAPE
#undef	FNM_PERIOD
#include <fnmatch.h>

/* Some system header files erroneously define these.
   We want our own definitions from <glob.h> to take precedence.  */
#undef	GLOB_ERR
#undef	GLOB_MARK
#undef	GLOB_NOSORT
#undef	GLOB_DOOFFS
#undef	GLOB_NOCHECK
#undef	GLOB_APPEND
#undef	GLOB_NOESCAPE
#undef	GLOB_PERIOD
#include <glob.h>

static int glob_pattern_p __P ((const char *pattern, int quote));
static int glob_in_dir __P ((const char *pattern, const char *directory,
			     int flags,
			     int (*errfunc) __P ((const char *, int)),
			     glob_t *pglob));
static int prefix_array __P ((const char *prefix, char **array, size_t n));
static int collated_compare __P ((const __ptr_t, const __ptr_t));

/* Do glob searching for PATTERN, placing results in PGLOB.
   The bits defined above may be set in FLAGS.
   If a directory cannot be opened or read and ERRFUNC is not nil,
   it is called with the pathname that caused the error, and the
   `errno' value from the failing call; if it returns non-zero
   `glob' returns GLOB_ABEND; if it returns zero, the error is ignored.
   If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
   Otherwise, `glob' returns zero.  */
int
glob (pattern, flags, errfunc, pglob)
     const char *pattern;
     int flags;
     int (*errfunc) __P ((const char *, int));
     glob_t *pglob;
{
  const char *filename;
  char *dirname;
  size_t dirlen;
  int status;
  int oldcount;

  if (pattern == NULL || pglob == NULL || (flags & ~__GLOB_FLAGS) != 0)
    {
      errno = EINVAL;
      return -1;
    }

  if (flags & GLOB_BRACE)
    {
      const char *begin = strchr (pattern, '{');
      if (begin != NULL)
	{
	  int firstc;
	  size_t restlen;
	  const char *p, *end, *next;
	  unsigned int depth = 0;

	  /* Find the end of the brace expression, by counting braces.
	     While we're at it, notice the first comma at top brace level.  */
	  end = begin + 1;
	  next = NULL;
	  while (1)
	    {
	      switch (*end++)
		{
		case ',':
		  if (depth == 0 && next == NULL)
		    next = end;
		  continue;
		case '{':
		  ++depth;
		  continue;
		case '}':
		  if (depth-- == 0)
		    break;
		  continue;
		case '\0':
		  return glob (pattern, flags &~ GLOB_BRACE, errfunc, pglob);
		}
	      break;
	    }
	  restlen = strlen (end) + 1;
	  if (next == NULL)
	    next = end;

	  /* We have a brace expression.  BEGIN points to the opening {,
	     NEXT points past the terminator of the first element, and END
	     points past the final }.  We will accumulate result names from
	     recursive runs for each brace alternative in the buffer using
	     GLOB_APPEND.  */

	  if (!(flags & GLOB_APPEND))
	    {
	      /* This call is to set a new vector, so clear out the
		 vector so we can append to it.  */
	      pglob->gl_pathc = 0;
	      pglob->gl_pathv = NULL;
	    }
	  firstc = pglob->gl_pathc;

	  /* In this loop P points to the beginning of the current element
	     and NEXT points past its terminator.  */
	  p = begin + 1;
	  while (1)
	    {
	      /* Construct a whole name that is one of the brace
		 alternatives in a temporary buffer.  */
	      int result;
	      size_t bufsz = (begin - pattern) + (next - 1 - p) + restlen;
#ifdef __GNUC__
	      char onealt[bufsz];
#else
	      char *onealt = malloc (bufsz);
	      if (onealt == NULL)
		{
		  if (!(flags & GLOB_APPEND))
		    globfree (pglob);
		  return GLOB_NOSPACE;
		}
#endif
	      memcpy (onealt, pattern, begin - pattern);
	      memcpy (&onealt[begin - pattern], p, next - 1 - p);
	      memcpy (&onealt[(begin - pattern) + (next - 1 - p)],
		      end, restlen);
	      result = glob (onealt,
			     ((flags & ~(GLOB_NOCHECK|GLOB_NOMAGIC)) |
			      GLOB_APPEND), errfunc, pglob);
#ifndef __GNUC__
	      free (onealt);
#endif

	      /* If we got an error, return it.  */
	      if (result && result != GLOB_NOMATCH)
		{
		  if (!(flags & GLOB_APPEND))
		    globfree (pglob);
		  return result;
		}

	      /* Advance past this alternative and process the next.  */
	      p = next;
	      depth = 0;
	    scan:
	      switch (*p++)
		{
		case ',':
		  if (depth == 0)
		    {
		      /* Found the next alternative.  Loop to glob it.  */
		      next = p;
		      continue;
		    }
		  goto scan;
		case '{':
		  ++depth;
		  goto scan;
		case '}':
		  if (depth-- == 0)
		    /* End of the brace expression.  Break out of the loop.  */
		    break;
		  goto scan;
		}
	    }

	  if (pglob->gl_pathc == firstc &&
	      !(flags & (GLOB_NOCHECK|GLOB_NOMAGIC)))
	    return GLOB_NOMATCH;
	}
    }

  /* Find the filename.  */
  filename = strrchr (pattern, '/');
  if (filename == NULL)
    {
      filename = pattern;
#ifdef _AMIGA
      dirname = (char *) "";
#else
      dirname = (char *) ".";
#endif
      dirlen = 0;
    }
  else if (filename == pattern)
    {
      /* "/pattern".  */
      dirname = (char *) "/";
      dirlen = 1;
      ++filename;
    }
  else
    {
      dirlen = filename - pattern;
      dirname = (char *) __alloca (dirlen + 1);
      memcpy (dirname, pattern, dirlen);
      dirname[dirlen] = '\0';
      ++filename;
    }

  if (filename[0] == '\0' && dirlen > 1)
    /* "pattern/".  Expand "pattern", appending slashes.  */
    {
      int val = glob (dirname, flags | GLOB_MARK, errfunc, pglob);
      if (val == 0)
	pglob->gl_flags = (pglob->gl_flags & ~GLOB_MARK) | (flags & GLOB_MARK);
      return val;
    }

  if (!(flags & GLOB_APPEND))
    {
      pglob->gl_pathc = 0;
      pglob->gl_pathv = NULL;
    }

  oldcount = pglob->gl_pathc;

#ifndef VMS
  if ((flags & GLOB_TILDE) && dirname[0] == '~')
    {
      if (dirname[1] == '\0')
	{
	  /* Look up home directory.  */