glob.c

Algorithms for Image Processing and Computer Vision Source Code

/* Copyright (C) 1991, 1992, 1993 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

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

#if defined (_LIBC) || !defined (__GNU_LIBRARY__)


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

#ifndef	NULL
#define	NULL	0
#endif

#if	defined (POSIX) || defined (DIRENT) || defined (__GNU_LIBRARY__)
#include <dirent.h>
#ifndef	__GNU_LIBRARY__
#define D_NAMLEN(d) strlen((d)->d_name)
#else	/* GNU C library.  */
#define D_NAMLEN(d) ((d)->d_namlen)
#endif	/* Not GNU C library.  */
#else	/* Not POSIX or DIRENT.  */
#define direct dirent
#define D_NAMLEN(d) ((d)->d_namlen)
#ifdef	SYSNDIR
#include <sys/ndir.h>
#endif	/* SYSNDIR */
#ifdef	SYSDIR
#include <sys/dir.h>
#endif	/* SYSDIR */
#ifdef NDIR
#include <ndir.h>
#endif	/* NDIR */
#endif	/* POSIX or DIRENT or __GNU_LIBRARY__.  */

#if defined (POSIX) && !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.  */

#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
static char *
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


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

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

#define	__alloca	alloca

#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>

__ptr_t (*__glob_opendir_hook) __P ((const char *directory));
const char *(*__glob_readdir_hook) __P ((__ptr_t stream));
void (*__glob_closedir_hook) __P ((__ptr_t stream));

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;
    }

  /* Find the filename.  */
  filename = strrchr (pattern, '/');
  if (filename == NULL)
    {
      filename = pattern;
      dirname = (char *) ".";
      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 ret = glob (dirname, flags | GLOB_MARK, errfunc, pglob);
      if (ret == 0)
	pglob->gl_flags = (pglob->gl_flags & ~GLOB_MARK) | (flags & GLOB_MARK);
      return ret;
    }

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

  oldcount = pglob->gl_pathc;

  if (glob_pattern_p (dirname, !(flags & GLOB_NOESCAPE)))
    {
      /* The directory name contains metacharacters, so we
	 have to glob for the directory, and then glob for
	 the pattern in each directory found.  */
      glob_t dirs;
      register int i;

      status = glob (dirname,
		     ((flags & (GLOB_ERR | GLOB_NOCHECK | GLOB_NOESCAPE)) |
		      GLOB_NOSORT),
		     errfunc, &dirs);
      if (status != 0)
	return status;

      /* We have successfully globbed the preceding directory name.
	 For each name we found, call glob_in_dir on it and FILENAME,
	 appending the results to PGLOB.  */
      for (i = 0; i < dirs.gl_pathc; ++i)
	{
	  int oldcount;

#ifdef	SHELL
	  {
	    /* Make globbing interruptible in the bash shell. */
	    extern int interrupt_state;

	    if (interrupt_state)
	      {
		globfree (&dirs);
		globfree (&files);
		return GLOB_ABEND;
	      }
	  }
#endif /* SHELL.  */

	  oldcount = pglob->gl_pathc;
	  status = glob_in_dir (filename, dirs.gl_pathv[i],
				(flags | GLOB_APPEND) & ~GLOB_NOCHECK,
				errfunc, pglob);
	  if (status == GLOB_NOMATCH)
	    /* No matches in this directory.  Try the next.  */
	    continue;

	  if (status != 0)
	    {
	      globfree (&dirs);
	      globfree (pglob);
	      return status;
	    }

	  /* Stick the directory on the front of each name.  */
	  if (prefix_array (dirs.gl_pathv[i],
			    &pglob->gl_pathv[oldcount],
			    pglob->gl_pathc - oldcount))
	    {
	      globfree (&dirs);
	      globfree (pglob);