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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [sysvi386/] [scandir.c] - Blame information for rev 258

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Line No. Rev Author Line
1 207 jeremybenn
/*
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 * Copyright (c) 1983 Regents of the University of California.
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 * 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)scandir.c   5.10 (Berkeley) 2/23/91";
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#endif /* LIBC_SCCS and not lint */
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/*
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 * Scan the directory dirname calling select to make a list of selected
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 * directory entries then sort using qsort and compare routine dcomp.
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 * Returns the number of entries and a pointer to a list of pointers to
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 * struct dirent (through namelist). Returns -1 if there were any errors.
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 */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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 * The DIRSIZ macro gives the minimum record length which will hold
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 * the directory entry.  This requires the amount of space in struct dirent
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 * without the d_name field, plus enough space for the name with a terminating
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 * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
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 */
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#undef DIRSIZ
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#define DIRSIZ(dp) \
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    ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
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int
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scandir(dirname, namelist, select, dcomp)
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        const char *dirname;
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        struct dirent ***namelist;
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        int (*select) __P((struct dirent *));
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        int (*dcomp) __P((const void *, const void *));
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{
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        register struct dirent *d, *p, **names;
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        register size_t nitems;
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        struct stat stb;
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        long arraysz;
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        DIR *dirp;
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        if ((dirp = opendir(dirname)) == NULL)
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                return(-1);
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        if (fstat(dirp->dd_fd, &stb) < 0)
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                return(-1);
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        /*
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         * estimate the array size by taking the size of the directory file
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         * and dividing it by a multiple of the minimum size entry.
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         */
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        arraysz = (stb.st_size / 24);
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        names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
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        if (names == NULL)
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                return(-1);
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        nitems = 0;
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        while ((d = readdir(dirp)) != NULL) {
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                if (select != NULL && !(*select)(d))
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                        continue;       /* just selected names */
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                /*
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                 * Make a minimum size copy of the data
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                 */
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                p = (struct dirent *)malloc(DIRSIZ(d));
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                if (p == NULL)
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                        return(-1);
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                p->d_ino = d->d_ino;
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                p->d_reclen = d->d_reclen;
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                p->d_namlen = d->d_namlen;
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                bcopy(d->d_name, p->d_name, p->d_namlen + 1);
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                /*
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                 * Check to make sure the array has space left and
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                 * realloc the maximum size.
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                 */
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                if (++nitems >= arraysz) {
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                        if (fstat(dirp->dd_fd, &stb) < 0)
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                                return(-1);     /* just might have grown */
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                        arraysz = stb.st_size / 12;
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                        names = (struct dirent **)realloc((char *)names,
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                                arraysz * sizeof(struct dirent *));
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                        if (names == NULL)
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                                return(-1);
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                }
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                names[nitems-1] = p;
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        }
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        closedir(dirp);
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        if (nitems && dcomp != NULL)
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                qsort(names, nitems, sizeof(struct dirent *), dcomp);
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        *namelist = names;
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        return(nitems);
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}
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/*
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 * Alphabetic order comparison routine for those who want it.
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 */
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int
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alphasort(d1, d2)
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        const void *d1;
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        const void *d2;
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{
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        return(strcmp((*(struct dirent **)d1)->d_name,
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            (*(struct dirent **)d2)->d_name));
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}

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