newlib-cygwin/newlib/libc/posix/scandir.c

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#ifndef HAVE_OPENDIR
/*
* Copyright (c) 1983 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)scandir.c 5.10 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
/*
* Scan the directory dirname calling select to make a list of selected
* directory entries then sort using qsort and compare routine dcomp.
* Returns the number of entries and a pointer to a list of pointers to
* struct dirent (through namelist). Returns -1 if there were any errors.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <sys/lock.h>
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/*
* The DIRSIZ macro gives the minimum record length which will hold
* the directory entry. This requires the amount of space in struct dirent
* without the d_name field, plus enough space for the name with a terminating
* null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
*/
#undef DIRSIZ
#ifdef _DIRENT_HAVE_D_NAMLEN
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#define DIRSIZ(dp) \
((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
#else
#define DIRSIZ(dp) \
((sizeof (struct dirent) - (MAXNAMLEN+1)) + ((strlen((dp)->d_name)+1 + 3) &~ 3))
#endif
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#ifndef __P
#define __P(args) ()
#endif
int
_DEFUN(scandir, (dirname, namelist, select, dcomp),
const char *dirname _AND
struct dirent ***namelist _AND
int (*select) __P((const struct dirent *)) _AND
int (*dcomp) __P((const struct dirent **, const struct dirent **)))
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{
register struct dirent *d, *p, **names;
register size_t nitems;
struct stat stb;
long arraysz;
DIR *dirp;
int successful = 0;
int rc = 0;
dirp = NULL;
names = NULL;
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if ((dirp = opendir(dirname)) == NULL)
return(-1);
#ifdef HAVE_DD_LOCK
__lock_acquire_recursive(dirp->dd_lock);
#endif
if (fstat(dirp->dd_fd, &stb) < 0)
goto cleanup;
/*
* If there were no directory entries, then bail.
*/
if (stb.st_size == 0)
goto cleanup;
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/*
* estimate the array size by taking the size of the directory file
* and dividing it by a multiple of the minimum size entry.
*/
arraysz = (stb.st_size / 24);
names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
if (names == NULL)
goto cleanup;
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nitems = 0;
while ((d = readdir(dirp)) != NULL) {
if (select != NULL && !(*select)(d))
continue; /* just selected names */
/*
* Make a minimum size copy of the data
*/
p = (struct dirent *)malloc(DIRSIZ(d));
if (p == NULL)
goto cleanup;
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p->d_ino = d->d_ino;
p->d_reclen = d->d_reclen;
#ifdef _DIRENT_HAVE_D_NAMLEN
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p->d_namlen = d->d_namlen;
bcopy(d->d_name, p->d_name, p->d_namlen + 1);
#else
strcpy(p->d_name, d->d_name);
#endif
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/*
* Check to make sure the array has space left and
* realloc the maximum size.
*/
if (++nitems >= arraysz) {
if (fstat(dirp->dd_fd, &stb) < 0)
goto cleanup;
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arraysz = stb.st_size / 12;
names = (struct dirent **)reallocf((char *)names,
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arraysz * sizeof(struct dirent *));
if (names == NULL)
goto cleanup;
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}
names[nitems-1] = p;
}
successful = 1;
cleanup:
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closedir(dirp);
if (successful) {
if (nitems && dcomp != NULL)
qsort(names, nitems, sizeof(struct dirent *), (void *)dcomp);
*namelist = names;
rc = nitems;
} else { /* We were unsuccessful, clean up storage and return -1. */
if ( names ) {
int i;
for (i=0; i < nitems; i++ )
free( names[i] );
free( names );
}
rc = -1;
}
#ifdef HAVE_DD_LOCK
__lock_release_recursive(dirp->dd_lock);
#endif
return(rc);
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}
/*
* Alphabetic order comparison routine for those who want it.
*/
int
_DEFUN(alphasort, (d1, d2),
const struct dirent **d1 _AND
const struct dirent **d2)
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{
return(strcmp((*d1)->d_name, (*d2)->d_name));
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}
#endif /* ! HAVE_OPENDIR */