diff options
Diffstat (limited to 'sysdeps/unix/readdir.c')
| -rw-r--r-- | sysdeps/unix/readdir.c | 84 |
1 files changed, 50 insertions, 34 deletions
diff --git a/sysdeps/unix/readdir.c b/sysdeps/unix/readdir.c index 1842948..84ac033 100644 --- a/sysdeps/unix/readdir.c +++ b/sysdeps/unix/readdir.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. +/* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,7 +16,6 @@ License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <ansidecl.h> #include <errno.h> #include <limits.h> #include <stddef.h> @@ -24,60 +23,77 @@ Cambridge, MA 02139, USA. */ #include <dirent.h> #include <unistd.h> #include <sys/types.h> +#include <assert.h> -#include "direct.h" /* This file defines `struct direct'. */ -#include "dirstream.h" - -/* direct.h may have an alternate definition for this. */ -#ifndef D_RECLEN -#define D_RECLEN(dp) ((dp)->d_reclen) -#endif +#include <dirstream.h> /* Read a directory entry from DIRP. */ struct dirent * -DEFUN(readdir, (dirp), DIR *dirp) +readdir (DIR *dirp) { - if (dirp == NULL || dirp->__data == NULL) + struct dirent *dp; + + if (dirp == NULL || dirp->data == NULL) { errno = EINVAL; return NULL; } - while (1) + do { - struct direct *dp; + size_t reclen; - if (dirp->__offset >= dirp->__size) + if (dirp->offset >= dirp->size) { /* We've emptied out our buffer. Refill it. */ + size_t maxread; off_t base; - ssize_t bytes = __getdirentries (dirp->__fd, dirp->__data, - dirp->__allocation, &base); + ssize_t bytes; + + if (sizeof (dp->d_name) > 1) + /* Fixed-size struct; must read one at a time (see below). */ + maxread = sizeof *dp; + else + maxread = dirp->allocation; + + base = dirp->filepos; + bytes = __getdirentries (dirp->fd, dirp->data, maxread, &base); if (bytes <= 0) return NULL; - dirp->__size = (size_t) bytes; + dirp->size = (size_t) bytes; /* Reset the offset into the buffer. */ - dirp->__offset = 0; + dirp->offset = 0; } - dp = (struct direct *) &dirp->__data[dirp->__offset]; - dirp->__offset += D_RECLEN (dp); + dp = (struct dirent *) &dirp->data[dirp->offset]; - if (dp->d_ino != 0) - { - /* Not a deleted file. */ - register struct dirent *d = &dirp->__entry; - register const char *p; - d->d_fileno = (ino_t) dp->d_ino; - /* On some systems the name length does not actually mean much. - But we always use it as a maximum. */ - p = memchr ((PTR) dp->d_name, '\0', D_NAMLEN (dp) + 1); - d->d_namlen = (p != NULL) ? p - dp->d_name : D_NAMLEN (dp); - memcpy (d->d_name, dp->d_name, d->d_namlen + 1); - return d; - } - } +#ifdef _DIRENT_HAVE_D_RECLEN + reclen = dp->d_reclen; +#else + /* The only version of `struct dirent' that lacks `d_reclen' + is fixed-size. */ + assert (sizeof dp->d_name > 1); + reclen = sizeof *dp; + /* The name is not terminated if it is the largest possible size. + Clobber the following byte to ensure proper null termination. We + read jst one entry at a time above so we know that byte will not + be used later. */ + dp->d_name[sizeof dp->d_name] = '\0'; +#endif + + dirp->offset += reclen; + +#ifdef _DIRENT_HAVE_D_OFF + dirp->filepos = dp->d_off; +#else + dirp->filepos += reclen; +#endif + + /* Skip deleted files. */ + } while (dp->d_ino == 0); + + return dp; } |