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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* ostream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
typedef struct {
ostream_t base;
char *path;
int fd;
off_t sparse_count;
off_t size;
} file_ostream_t;
static int file_append(ostream_t *strm, const void *data, size_t size)
{
file_ostream_t *file = (file_ostream_t *)strm;
ssize_t ret;
if (size == 0)
return 0;
if (file->sparse_count > 0) {
if (lseek(file->fd, file->sparse_count, SEEK_CUR) == (off_t)-1)
goto fail_errno;
file->sparse_count = 0;
}
while (size > 0) {
ret = write(file->fd, data, size);
if (ret == 0) {
fprintf(stderr, "%s: truncated data write.\n",
file->path);
return -1;
}
if (ret < 0) {
if (errno == EINTR)
continue;
goto fail_errno;
}
file->size += ret;
size -= ret;
data = (const char *)data + ret;
}
return 0;
fail_errno:
perror(file->path);
return -1;
}
static int file_append_sparse(ostream_t *strm, size_t size)
{
file_ostream_t *file = (file_ostream_t *)strm;
file->sparse_count += size;
file->size += size;
return 0;
}
static int file_flush(ostream_t *strm)
{
file_ostream_t *file = (file_ostream_t *)strm;
if (file->sparse_count > 0) {
if (ftruncate(file->fd, file->size) != 0)
goto fail;
}
if (fsync(file->fd) != 0) {
if (errno == EINVAL)
return 0;
goto fail;
}
return 0;
fail:
perror(file->path);
return -1;
}
static void file_destroy(sqfs_object_t *obj)
{
file_ostream_t *file = (file_ostream_t *)obj;
if (file->fd != STDOUT_FILENO)
close(file->fd);
free(file->path);
free(file);
}
static const char *file_get_filename(ostream_t *strm)
{
file_ostream_t *file = (file_ostream_t *)strm;
return file->path;
}
ostream_t *ostream_open_file(const char *path, int flags)
{
file_ostream_t *file = calloc(1, sizeof(*file));
sqfs_object_t *obj = (sqfs_object_t *)file;
ostream_t *strm = (ostream_t *)file;
if (file == NULL) {
perror(path);
return NULL;
}
file->path = strdup(path);
if (file->path == NULL) {
perror(path);
goto fail_free;
}
if (flags & OSTREAM_OPEN_OVERWRITE) {
file->fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
} else {
file->fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0644);
}
if (file->fd < 0) {
perror(path);
goto fail_path;
}
if (flags & OSTREAM_OPEN_SPARSE)
strm->append_sparse = file_append_sparse;
strm->append = file_append;
strm->flush = file_flush;
strm->get_filename = file_get_filename;
obj->destroy = file_destroy;
return strm;
fail_path:
free(file->path);
fail_free:
free(file);
return NULL;
}
ostream_t *ostream_open_stdout(void)
{
file_ostream_t *file = calloc(1, sizeof(*file));
sqfs_object_t *obj = (sqfs_object_t *)file;
ostream_t *strm = (ostream_t *)file;
if (file == NULL)
goto fail;
file->path = strdup("stdout");
if (file->path == NULL)
goto fail;
file->fd = STDOUT_FILENO;
strm->append = file_append;
strm->flush = file_flush;
strm->get_filename = file_get_filename;
obj->destroy = file_destroy;
return strm;
fail:
perror("creating file wrapper for stdout");
free(file);
return NULL;
}
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