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File: [local] / src / libexec / ld.so / dir.c (download)
Revision 1.25, Sat Jan 8 06:49:41 2022 UTC (2 years, 5 months ago) by guenther
Prep .c files for removing the #includes from */archdep.h * replace #include "archdep.h" with #includes of what is used, pulling in "syscall.h", "util.h", and "archdep.h" as needed * delete #include <sys/syscall.h> from syscall.h * only pull in <sys/stat.h> to the three files that use _dl_fstat(), forward declare struct stat in syscall.h for the others * NBBY is for <sys/select.h> macros; just use '8' in dl_printf.c * <machine/vmparam.h> is only needed on i386; conditionalize it * stop using __LDPGSZ: use _MAX_PAGE_SHIFT (already used by malloc.c) where necessary * delete other bogus #includes, order legit per style: <sys/*> then <*/*>, then <*>, then "*" dir.c improvement from jsg@ ok and testing assistance deraadt@ |
/* $OpenBSD: dir.c,v 1.25 2022/01/08 06:49:41 guenther Exp $ */ /* * Copyright (c) 1983, 1993 * The 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. 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. */ #include <sys/stat.h> #include <dirent.h> #include <fcntl.h> #include "syscall.h" #include "util.h" #include "dir.h" struct _dl_dirdesc { long dd_loc; /* offset in current buffer */ long dd_size; /* amount of data returned by getdents() */ char *dd_buf; /* data buffer */ int dd_len; /* size of data buffer */ int dd_fd; /* file descriptor associated with directory */ }; /* * Open a directory. */ _dl_DIR * _dl_opendir(const char *name) { _dl_DIR *dirp; int fd; struct stat sb; if ((fd = _dl_open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) < 0) return (NULL); if (_dl_fstat(fd, &sb) || (dirp = _dl_malloc(sizeof(*dirp))) == NULL) { _dl_close(fd); return (NULL); } dirp->dd_fd = fd; dirp->dd_loc = 0; dirp->dd_size = 0; dirp->dd_len = _dl_round_page(sb.st_blksize); dirp->dd_buf = _dl_malloc(dirp->dd_len); if (dirp->dd_buf == NULL) { _dl_free(dirp); _dl_close(fd); return (NULL); } return (dirp); } /* * close a directory. */ int _dl_closedir(_dl_DIR *dirp) { int ret; ret = _dl_close(dirp->dd_fd); _dl_free(dirp->dd_buf); _dl_free(dirp); return ret; } /* * get next entry in a directory. */ struct dirent * _dl_readdir(_dl_DIR *dirp) { struct dirent *dp; for (;;) { if (dirp->dd_loc >= dirp->dd_size) { dirp->dd_loc = 0; } if (dirp->dd_loc == 0) { dirp->dd_size = _dl_getdents(dirp->dd_fd, dirp->dd_buf, dirp->dd_len); if (dirp->dd_size <= 0) return (NULL); } dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); if ((long)dp & 03) /* bogus pointer check */ return (NULL); if (dp->d_reclen <= 0 || dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) return (NULL); dirp->dd_loc += dp->d_reclen; if (dp->d_ino == 0) continue; return (dp); } }