97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/*
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* File i/o routines for 2.xBSD filesystem.
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*
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* Copyright (C) 2006-2011 Serge Vakulenko, <serge@vak.ru>
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*
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* Permission to use, copy, modify, and distribute this software
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* and its documentation for any purpose and without fee is hereby
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* granted, provided that the above copyright notice appear in all
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* copies and that both that the copyright notice and this
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* permission notice and warranty disclaimer appear in supporting
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* documentation, and that the name of the author not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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*
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* The author disclaim all warranties with regard to this
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* software, including all implied warranties of merchantability
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* and fitness. In no event shall the author be liable for any
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* special, indirect or consequential damages or any damages
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* whatsoever resulting from loss of use, data or profits, whether
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* in an action of contract, negligence or other tortious action,
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* arising out of or in connection with the use or performance of
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* this software.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "bsdfs.h"
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extern int verbose;
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int fs_file_create (fs_t *fs, fs_file_t *file, const char *name, int mode)
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{
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if (! fs_inode_create (fs, &file->inode, name, mode)) {
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fprintf (stderr, "%s: inode open failed\n", name);
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return 0;
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}
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if ((file->inode.mode & INODE_MODE_FMT) == INODE_MODE_FDIR) {
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/* Cannot open directory on write. */
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return 0;
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}
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fs_inode_truncate (&file->inode, 0);
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fs_inode_save (&file->inode, 0);
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file->writable = 1;
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file->offset = 0;
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return 1;
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}
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int fs_file_open (fs_t *fs, fs_file_t *file, const char *name, int wflag)
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{
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if (! fs_inode_lookup (fs, &file->inode, name)) {
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fprintf (stderr, "%s: inode open failed\n", name);
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return 0;
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}
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if (wflag && (file->inode.mode & INODE_MODE_FMT) == INODE_MODE_FDIR) {
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/* Cannot open directory on write. */
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return 0;
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}
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file->writable = wflag;
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file->offset = 0;
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return 1;
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}
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int fs_file_read (fs_file_t *file, unsigned char *data, unsigned long bytes)
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{
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if (! fs_inode_read (&file->inode, file->offset, data, bytes)) {
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fprintf (stderr, "inode %d: file read failed, %lu bytes at offset %lu\n",
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file->inode.number, bytes, file->offset);
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return 0;
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}
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file->offset += bytes;
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return 1;
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}
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int fs_file_write (fs_file_t *file, unsigned char *data, unsigned long bytes)
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{
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if (! file->writable)
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return 0;
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if (! fs_inode_write (&file->inode, file->offset, data, bytes)) {
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fprintf (stderr, "inode %d: file write failed, %lu bytes at offset %lu\n",
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file->inode.number, bytes, file->offset);
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return 0;
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}
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file->offset += bytes;
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return 1;
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}
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int fs_file_close (fs_file_t *file)
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{
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if (file->writable) {
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if (! fs_inode_save (&file->inode, 0)) {
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fprintf (stderr, "inode %d: file close failed\n",
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file->inode.number);
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return 0;
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}
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}
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return 1;
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}
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