mes/lib/dirent/readdir.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright (C) 1991,92,93,94,95,96,97,99,2000 Free Software Foundation, Inc.
* Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
// Taken from GNU C Library 2.2.5
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <string.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/types.h>
#include <assert.h>
#include <dirstream.h>
build: Simplify. core: Make mes src/ c files separate compilation units. * include/mes/constants.h: New file. * include/mes/macros.h: New file. * include/mes/mes.h: New file. * src/gc.c: Update. * src/hash.c: Update. * src/lib.c: Update. * src/math.c: Update. * src/mes.c: Update. * src/module.c: Update. * src/posix.c: Update. * src/reader.c: Update. * src/string.c: Update. * src/struct.c: Update. * src/vector.c: Update. mes: Update datadir. * src/mes.c (g_datadir): New global. (open_boot): Rename from read_boot. (read_boot): New function. * mes/module/mes/boot-0.scm: Move from boot-0.scm.in * configure: Update. * configure.sh: Update. mescc: Create libraries from separate files. * .gitignore: Update. * build-aux/bootstrap-mes.sh: Remove. * build-aux/bootstrap.sh.in: Remove. * build-aux/build-guile.sh: Update. * build-aux/build-mes.sh: Update. * build-aux/build-scaffold.sh: New file. * build-aux/build.sh.in: Update. * build-aux/cc.sh: Update. * build-aux/check-tcc.sh: Remove. * build-aux/config.sh.in: New file. * build-aux/config.sh: Remove. * build-aux/install.sh.in: Update. * build-aux/test-boot.sh: New file. * build-aux/test-c.sh: New file. * build-aux/test-driver: New file. * build-aux/test-suite.sh: New file. * build-aux/trace.sh: Update. * build-aux/uninstall.sh.in: Update. * configure: Update. * configure.sh: Update. * lib/linux/x86-mes-mescc/crt1.c: Move from lib/linux/x86-mes. * lib/linux/x86-mes-mescc/mini.c: Likewise. * lib/linux/x86_64-mes-mescc/crt1.c: Move from lib/linux/x86_64-mes. * lib/linux/x86_64-mes-mescc/mini.c: Likewise. * lib/linux/x86-mes-gcc/syscall.c: Rename from mes.c. * lib/linux/x86-mes-mescc/syscall.c: Likewise. * lib/linux/x86_64-mes-gcc/syscall.c: Likewise. * lib/linux/x86_64-mes-mescc/syscall.c: Likewise. * lib/mes/mes_open.c: Include config.h. * lib/tests/stdio/70-printf-hello.c: Likewise. * lib/tests/stdio/70-printf-simple.c: Likewise. * scaffold/gc-test.sh: New file. * simple.sh: Update.
2019-06-08 14:36:22 +01:00
int getdents (int filedes, char *buffer, size_t nbytes);
/* Read a directory entry from DIRP. */
struct dirent *
readdir (DIR * dirp)
{
struct dirent *dp;
int saved_errno = errno;
do
{
size_t reclen;
if (dirp->offset >= dirp->size)
{
/* We've emptied out our buffer. Refill it. */
size_t maxread;
ssize_t bytes;
maxread = dirp->allocation;
#if 0
off_t base;
bytes = __getdirentries (dirp->fd, dirp->data, maxread, &base);
#else
bytes = getdents (dirp->fd, dirp->data, maxread);
#endif
if (bytes <= 0)
{
/* Don't modifiy errno when reaching EOF. */
if (bytes == 0)
errno = saved_errno;
dp = 0;
break;
}
dirp->size = (size_t) bytes;
/* Reset the offset into the buffer. */
dirp->offset = 0;
}
dp = (struct dirent *) &dirp->data[dirp->offset];
reclen = dp->d_reclen;
dirp->offset += reclen;
dirp->filepos = dp->d_off;
/* Skip deleted files. */
}
while (dp->d_ino == 0);
return dp;
}