scandir.c
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上传日期:2007-01-04
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- /*
- * 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: 30 September 1999
- *
- * Copyright 1999 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 */
- void *s = names; /* stupid language */
- nlmax *= 2; /* double it */
- fs_resize ((void **) &s,nlmax * sizeof (struct direct *));
- names = (struct direct **) s;
- }
- 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 */
- }