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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [readdir64.c] - Rev 301
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/* * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. */ /* Modified from newlib/libc/posix/readdir.c */ #include <dirent.h> #include <machine/syscall.h> #define __NR___getdents64 __NR_getdents64 static _syscall3(int,__getdents64,int,fd,struct dirent64 *,dirp,unsigned int,count) /* * get next entry in a directory. */ struct dirent64 * __readdir64 (dirp) register DIR *dirp; { register struct dirent64 *dp; #ifdef HAVE_DD_LOCK __lock_acquire_recursive(dirp->dd_lock); #endif if (dirp->dd_fd == -1) return NULL; for (;;) { if (dirp->dd_loc == 0) { dirp->dd_size = __getdents64 (dirp->dd_fd, (void *)dirp->dd_buf, dirp->dd_len); if (dirp->dd_size <= 0) { #ifdef HAVE_DD_LOCK __lock_release_recursive(dirp->dd_lock); #endif return NULL; } } if (dirp->dd_loc >= dirp->dd_size) { dirp->dd_loc = 0; continue; } dp = (struct dirent64 *)(dirp->dd_buf + dirp->dd_loc); if ((int)dp & 03) { /* bogus pointer check */ #ifdef HAVE_DD_LOCK __lock_release_recursive(dirp->dd_lock); #endif return NULL; } if (dp->d_reclen <= 0 || dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) { #ifdef HAVE_DD_LOCK __lock_release_recursive(dirp->dd_lock); #endif return NULL; } dirp->dd_loc += dp->d_reclen; if (dp->d_ino == 0) continue; #ifdef HAVE_DD_LOCK __lock_release_recursive(dirp->dd_lock); #endif return (dp); } }
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