File::Glob - Perl extension for BSD glob routine


NAME

File::Glob - Perl extension for BSD glob routine


SYNOPSIS

  use File::Glob ':glob';
  @list = bsd_glob('*.[ch]');
  $homedir = bsd_glob('~gnat', GLOB_TILDE | GLOB_ERR);
  if (GLOB_ERROR) {
    # an error occurred reading $homedir
  }
  ## override the core glob (CORE::glob() does this automatically
  ## by default anyway, since v5.6.0)
  use File::Glob ':globally';
  my @sources = <*.{c,h,y}>
  ## override the core glob, forcing case sensitivity
  use File::Glob qw(:globally :case);
  my @sources = <*.{c,h,y}>
  ## override the core glob forcing case insensitivity
  use File::Glob qw(:globally :nocase);
  my @sources = <*.{c,h,y}>


DESCRIPTION

File::Glob::bsd_glob() implements the FreeBSD glob(3) routine, which is a superset of the POSIX glob() (described in IEEE Std 1003.2 ``POSIX.2''). bsd_glob() takes a mandatory pattern argument, and an optional flags argument, and returns a list of filenames matching the pattern, with interpretation of the pattern modified by the flags variable.

Since v5.6.0, Perl's CORE::glob() is implemented in terms of bsd_glob(). Note that they don't share the same prototype--CORE::glob() only accepts a single argument. Due to historical reasons, CORE::glob() will also split its argument on whitespace, treating it as multiple patterns, whereas bsd_glob() considers them as one pattern.

The POSIX defined flags for bsd_glob() are:

GLOB_ERR
Force bsd_glob() to return an error when it encounters a directory it cannot open or read. Ordinarily bsd_glob() continues to find matches.

GLOB_LIMIT
Make bsd_glob() return an error (GLOB_NOSPACE) when the pattern expands to a size bigger than the system constant ARG_MAX (usually found in limits.h). If your system does not define this constant, bsd_glob() uses sysconf(_SC_ARG_MAX) or _POSIX_ARG_MAX where available (in that order). You can inspect these values using the standard POSIX extension.

GLOB_MARK
Each pathname that is a directory that matches the pattern has a slash appended.

GLOB_NOCASE
By default, file names are assumed to be case sensitive; this flag makes bsd_glob() treat case differences as not significant.

GLOB_NOCHECK
If the pattern does not match any pathname, then bsd_glob() returns a list consisting of only the pattern. If GLOB_QUOTE is set, its effect is present in the pattern returned.

GLOB_NOSORT
By default, the pathnames are sorted in ascending ASCII order; this flag prevents that sorting (speeding up bsd_glob()).

The FreeBSD extensions to the POSIX standard are the following flags:

GLOB_BRACE
Pre-process the string to expand {pat,pat,...} strings like csh(1). The pattern '{}' is left unexpanded for historical reasons (and csh(1) does the same thing to ease typing of find(1) patterns).

GLOB_NOMAGIC
Same as GLOB_NOCHECK but it only returns the pattern if it does not contain any of the special characters ``*'', ``?'' or ``[''. NOMAGIC is provided to simplify implementing the historic csh(1) globbing behaviour and should probably not be used anywhere else.

GLOB_QUOTE
Use the backslash ('\') character for quoting: every occurrence of a backslash followed by a character in the pattern is replaced by that character, avoiding any special interpretation of the character. (But see below for exceptions on DOSISH systems).

GLOB_TILDE
Expand patterns that start with '~' to user name home directories.

GLOB_CSH
For convenience, GLOB_CSH is a synonym for GLOB_BRACE | GLOB_NOMAGIC | GLOB_QUOTE | GLOB_TILDE | GLOB_ALPHASORT.

The POSIX provided GLOB_APPEND, GLOB_DOOFFS, and the FreeBSD extensions GLOB_ALTDIRFUNC, and GLOB_MAGCHAR flags have not been implemented in the Perl version because they involve more complex interaction with the underlying C structures.

The following flag has been added in the Perl implementation for csh compatibility:

GLOB_ALPHASORT
If GLOB_NOSORT is not in effect, sort filenames is alphabetical order (case does not matter) rather than in ASCII order.


DIAGNOSTICS

bsd_glob() returns a list of matching paths, possibly zero length. If an error occurred, &File::Glob::GLOB_ERROR will be non-zero and $! will be set. &File::Glob::GLOB_ERROR is guaranteed to be zero if no error occurred, or one of the following values otherwise:

GLOB_NOSPACE
An attempt to allocate memory failed.

GLOB_ABEND
The glob was stopped because an error was encountered.

In the case where bsd_glob() has found some matching paths, but is interrupted by an error, it will return a list of filenames and set &File::Glob::ERROR.

Note that bsd_glob() deviates from POSIX and FreeBSD glob(3) behaviour by not considering ENOENT and ENOTDIR as errors - bsd_glob() will continue processing despite those errors, unless the GLOB_ERR flag is set.

Be aware that all filenames returned from File::Glob are tainted.


NOTES


AUTHOR

The Perl interface was written by Nathan Torkington <gnat@frii.com>, and is released under the artistic license. Further modifications were made by Greg Bacon <gbacon@cs.uah.edu>, Gurusamy Sarathy <gsar@activestate.com>, and Thomas Wegner <wegner_thomas@yahoo.com>. The C glob code has the following copyright:

    Copyright (c) 1989, 1993 The Regents of the University of California.
    All rights reserved.
    This code is derived from software contributed to Berkeley by
    Guido van Rossum.
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
    3. Neither the name of the University nor the names of its contributors
       may be used to endorse or promote products derived from this software
       without specific prior written permission.
    THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.
 File::Glob - Perl extension for BSD glob routine