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121 lines
3.9 KiB
Groff
121 lines
3.9 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)scandir.3 8.1 (Berkeley) 6/4/93
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.\"
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.TH SCANDIR 3 "27 January 1997" GNO "Library Routines"
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.SH NAME
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.BR scandir ,
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.BR alphasort
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\- scan a directory
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.SH SYNOPSIS
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#include <sys/types.h>
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.br
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#include <dirent.h>
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.sp 1
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int
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\fBscandir\fR (const char *\fIdirname\fR,
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struct dirent ***\fInamelist\fR,
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int (*\fIselect\fR) (struct dirent *),
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int (*\fIcompar\fR) (const void *, const void *));
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.sp 1
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int
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alphasort (const void *d1, const void *d2);
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.sp 1
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int
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alphacasesort (const void *d1, const void *d2);
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.SH DESCRIPTION
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The
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.BR scandir
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function
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reads the directory
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.I dirname
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and builds an array of pointers to directory
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entries using
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.BR malloc (3).
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It returns the number of entries in the array.
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A pointer to the array of directory entries is stored in the location
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referenced by
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.IR namelist .
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.LP
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The
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.I select
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parameter is a pointer to a user supplied subroutine which is called by
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.BR scandir
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to select which entries are to be included in the array.
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The select routine is passed a
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pointer to a directory entry and should return a non-zero
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value if the directory entry is to be included in the array.
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If
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.I select
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is null, then all the directory entries will be included.
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.LP
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The
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.I compar
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parameter is a pointer to a user supplied subroutine which is passed to
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.BR qsort (3)
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to sort the completed array.
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If this pointer is null, the array is not sorted.
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.LP
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The
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.BR alphasort
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function
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is a routine which can be used for the
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.I compar
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parameter to sort the array alphabetically.
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.LP
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The
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.BR alphacasesort
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function is similar to
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.BR alphasort ,
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but can be used for sorting in a case-insensitive manner, and is useful
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for the case-insensitive filesystems used by GNO. This function is
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specific to GNO.
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.LP
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The memory allocated for the array can be deallocated with
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.BR free (3),
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by freeing each pointer in the array and then the array itself.
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.SH DIAGNOSTICS
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Returns \-1 if the directory cannot be opened for reading or if
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.BR malloc (3)
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cannot allocate enough memory to hold all the data structures.
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.SH SEE ALSO
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.BR directory (3),
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.BR malloc (3),
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.BR qsort (3),
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.BR dir (5)
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.SH HISTORY
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The
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.BR scandir
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and
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.BR alphasort
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functions appeared in 4.2BSD.
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