43fa6fe319
identifier namespace by renaming non standard functions and variables such that they have a leading underscore. The library will use those names internally. Weak aliases are used to provide the original names to the API. This is only the first part of this change. It is most of the functions which are implemented in C for all NetBSD ports. Subsequent changes are to add the same support to the remaining C files, to assembly files, and to the automagically generated assembly source used for system calls. When all of the above is done, ports with weak alias support should add a definition for __weak_alias to <sys/cdefs.h>.
149 lines
4.8 KiB
C
149 lines
4.8 KiB
C
/* $NetBSD: scandir.c,v 1.8 1997/07/21 14:07:27 jtc Exp $ */
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/*
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* Copyright (c) 1983, 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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)scandir.c 8.3 (Berkeley) 1/2/94";
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#else
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__RCSID("$NetBSD: scandir.c,v 1.8 1997/07/21 14:07:27 jtc Exp $");
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#endif
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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 "namespace.h"
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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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#ifdef __weak_alias
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__weak_alias(scandir,_scandir);
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__weak_alias(alphasort,_alphasort);
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#endif
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/*
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* The DIRSIZ macro is the minimum record length which will hold the directory
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* entry. This requires the amount of space in struct dirent without the
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* d_name field, plus enough space for the name and a terminating nul byte
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* (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) - sizeof(dp)->d_name) + \
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(((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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