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// Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
//
// SPDX-License-Identifier: BSD-2-Clause
#include <wasi/api.h>
#include <errno.h>
#include <unistd.h>
ssize_t pread(int fildes, void *buf, size_t nbyte, off_t offset) {
if (offset < 0) {
errno = EINVAL;
return -1;
}
__wasi_iovec_t iov = {.buf = buf, .buf_len = nbyte};
size_t bytes_read;
__wasi_errno_t error =
__wasi_fd_pread(fildes, &iov, 1, offset, &bytes_read);
if (error != 0) {
__wasi_fdstat_t fds;
if (error == ENOTCAPABLE && __wasi_fd_fdstat_get(fildes, &fds) == 0) {
// Determine why we got ENOTCAPABLE.
if ((fds.fs_rights_base & __WASI_RIGHTS_FD_READ) == 0)
error = EBADF;
else
error = ESPIPE;
}
errno = error;
return -1;
}
return bytes_read;
}
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