106 lines
3.4 KiB
Groff
106 lines
3.4 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" 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.
|
|
.\" 4. 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.
|
|
.\"
|
|
.\" @(#)scandir.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt SCANDIR 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm scandir ,
|
|
.Nm alphasort
|
|
.Nd scan a directory
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In dirent.h
|
|
.Ft int
|
|
.Fn scandir "const char *dirname" "struct dirent ***namelist" "int \\*(lp*select\\*(rp\\*(lpstruct dirent *\\*(rp" "int \\*(lp*compar\\*(rp\\*(lpconst void *, const void *\\*(rp"
|
|
.Ft int
|
|
.Fn alphasort "const void *d1" "const void *d2"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn scandir
|
|
function
|
|
reads the directory
|
|
.Fa dirname
|
|
and builds an array of pointers to directory
|
|
entries using
|
|
.Xr malloc 3 .
|
|
It returns the number of entries in the array.
|
|
A pointer to the array of directory entries is stored in the location
|
|
referenced by
|
|
.Fa namelist .
|
|
.Pp
|
|
The
|
|
.Fa select
|
|
argument is a pointer to a user supplied subroutine which is called by
|
|
.Fn scandir
|
|
to select which entries are to be included in the array.
|
|
The select routine is passed a
|
|
pointer to a directory entry and should return a non-zero
|
|
value if the directory entry is to be included in the array.
|
|
If
|
|
.Fa select
|
|
is null, then all the directory entries will be included.
|
|
.Pp
|
|
The
|
|
.Fa compar
|
|
argument is a pointer to a user supplied subroutine which is passed to
|
|
.Xr qsort 3
|
|
to sort the completed array.
|
|
If this pointer is null, the array is not sorted.
|
|
.Pp
|
|
The
|
|
.Fn alphasort
|
|
function
|
|
is a routine which can be used for the
|
|
.Fa compar
|
|
argument to sort the array alphabetically.
|
|
.Pp
|
|
The memory allocated for the array can be deallocated with
|
|
.Xr free 3 ,
|
|
by freeing each pointer in the array and then the array itself.
|
|
.Sh DIAGNOSTICS
|
|
Returns \-1 if the directory cannot be opened for reading or if
|
|
.Xr malloc 3
|
|
cannot allocate enough memory to hold all the data structures.
|
|
.Sh SEE ALSO
|
|
.Xr directory 3 ,
|
|
.Xr malloc 3 ,
|
|
.Xr qsort 3 ,
|
|
.Xr dir 5
|
|
.Sh HISTORY
|
|
The
|
|
.Fn scandir
|
|
and
|
|
.Fn alphasort
|
|
functions appeared in
|
|
.Bx 4.2 .
|