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scandir.c
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1998-09-16
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3KB
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75 lines
/*
* Program: Scan directories
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 1 August 1988
* Last Edited: 15 June 1995
*
* Copyright 1995 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made available
* "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
/* Emulator for BSD scandir() call
* Accepts: directory name
* destination pointer of names array
* selection function
* comparison function
* Returns: number of elements in the array or -1 if error
*/
int scandir (char *dirname,struct direct ***namelist,select_t select,
compar_t compar)
{
struct direct *p,*d,**names;
int nitems;
struct stat stb;
long nlmax;
DIR *dirp = opendir (dirname);/* open directory and get status poop */
if ((!dirp) || (fstat (dirp->dd_fd,&stb) < 0)) return -1;
nlmax = stb.st_size / 24; /* guesstimate at number of files */
names = (struct direct **) fs_get (nlmax * sizeof (struct direct *));
nitems = 0; /* initially none found */
while (d = readdir (dirp)) { /* read directory item */
/* matches select criterion? */
if (select && !(*select) (d)) continue;
/* get size of direct record for this file */
p = (struct direct *) fs_get (DIR_SIZE (d));
p->d_ino = d->d_ino; /* copy the poop */
strcpy (p->d_name,d->d_name);
if (++nitems >= nlmax) { /* if out of space, try bigger guesstimate */
nlmax *= 2; /* double it */
fs_resize ((void **) &names,nlmax * sizeof (struct direct *));
}
names[nitems - 1] = p; /* store this file there */
}
closedir (dirp); /* done with directory */
/* sort if necessary */
if (nitems && compar) qsort (names,nitems,sizeof (struct direct *),compar);
*namelist = names; /* return directory */
return nitems; /* and size */
}