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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* unix.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/io.h"
#include "sqfs/error.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
int sqfs_native_file_open(sqfs_file_handle_t *out, const char *filename,
sqfs_u32 flags)
{
int open_mode;
*out = -1;
if (flags & ~SQFS_FILE_OPEN_ALL_FLAGS)
return SQFS_ERROR_UNSUPPORTED;
if (flags & SQFS_FILE_OPEN_READ_ONLY) {
open_mode = O_RDONLY;
} else {
open_mode = O_CREAT | O_RDWR;
if (flags & SQFS_FILE_OPEN_OVERWRITE) {
open_mode |= O_TRUNC;
} else {
open_mode |= O_EXCL;
}
}
*out = open(filename, open_mode, 0644);
return (*out < 0) ? SQFS_ERROR_IO : 0;
}
void sqfs_native_file_close(sqfs_file_handle_t fd)
{
while (close(fd) != 0 && errno == EINTR)
;
}
int sqfs_native_file_duplicate(sqfs_file_handle_t in, sqfs_file_handle_t *out)
{
*out = dup(in);
return (*out < 0) ? SQFS_ERROR_IO : 0;
}
int sqfs_native_file_seek(sqfs_file_handle_t fd,
sqfs_s64 offset, sqfs_u32 flags)
{
int whence;
off_t off;
switch (flags & SQFS_FILE_SEEK_TYPE_MASK) {
case SQFS_FILE_SEEK_START: whence = SEEK_SET; break;
case SQFS_FILE_SEEK_CURRENT: whence = SEEK_CUR; break;
case SQFS_FILE_SEEK_END: whence = SEEK_END; break;
default: return SQFS_ERROR_UNSUPPORTED;
}
if (flags & ~(SQFS_FILE_SEEK_FLAG_MASK | SQFS_FILE_SEEK_TYPE_MASK))
return SQFS_ERROR_UNSUPPORTED;
off = lseek(fd, offset, whence);
if (off == ((off_t)-1)) {
if (errno == ESPIPE)
return SQFS_ERROR_UNSUPPORTED;
return SQFS_ERROR_IO;
}
if (flags & SQFS_FILE_SEEK_TRUNCATE) {
while (ftruncate(fd, off) != 0) {
if (errno != EINTR)
return SQFS_ERROR_IO;
}
}
return 0;
}
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