dd28a6c6dd
struct dirent *, rather than non-const. this makes scandir(3) the same as the scandir implementations in libiberty and glibc, and the select function has no need to modify the dirent.
111 lines
3.7 KiB
Groff
111 lines
3.7 KiB
Groff
.\" $NetBSD: scandir.3,v 1.7 2000/04/16 14:43:57 mrg Exp $
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.\"
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.\" 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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.Dd June 4, 1993
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.Dt SCANDIR 3
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.Os
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.Sh NAME
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.Nm scandir ,
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.Nm alphasort
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.Nd scan a directory
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <dirent.h>
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.Ft int
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.Fn scandir "const char *dirname" "struct dirent ***namelist" "int \\*(lp*select\\*(rp\\*(lpconst struct dirent *\\*(rp" "int \\*(lp*compar\\*(rp\\*(lpconst void *, const void *\\*(rp"
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.Ft int
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.Fn alphasort "const void *d1" "const void *d2"
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.Sh DESCRIPTION
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The
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.Fn scandir
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function
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reads the directory
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.Fa dirname
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and builds an array of pointers to directory
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entries using
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.Xr 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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.Fa namelist .
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.Pp
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The
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.Fa select
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parameter is a pointer to a user supplied subroutine which is called by
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.Fn 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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.Fa select
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is null, then all the directory entries will be included.
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.Pp
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The
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.Fa compar
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parameter is a pointer to a user supplied subroutine which is passed to
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.Xr 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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.Pp
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The
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.Fn alphasort
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function
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is a routine which can be used for the
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.Fa compar
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parameter to sort the array alphabetically.
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.Pp
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The memory allocated for the array can be deallocated with
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.Xr 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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.Xr 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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.Xr directory 3 ,
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.Xr malloc 3 ,
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.Xr qsort 3 ,
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.Xr dir 5
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.Sh HISTORY
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The
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.Fn scandir
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and
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.Fn alphasort
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functions appeared in
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.Bx 4.2 .
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