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// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
//
// SPDX-License-Identifier: AGPL-3.0-or-later
const std = @import("std");
const Result = extern struct {
value: usize,
status: usize,
};
export fn _start() void {
main();
}
pub fn main() void {
const s1 = "Hello";
asm volatile (
\\ li a7, 100000
\\ ecall
:
: [s] "{a0}" (s1.ptr),
[n] "{a1}" (s1.len),
: "a7"
);
const path = "/foo\x00";
asm volatile (
\\ li a7, 100003
\\ li a2, 0
\\ ecall
:
: [path] "{a0}" (path.ptr),
[readFn] "{a1}" (&read),
: "a7", "a2"
);
const s2 = "Stream resource provided";
asm volatile (
\\ li a7, 100000
\\ ecall
:
: [s] "{a0}" (s2.ptr),
[n] "{a1}" (s2.len),
: "a7"
);
const handle = asm volatile (
\\ li a7, 100001
\\ ecall
: [handle] "={a0}" (-> usize),
: [path] "{a0}" (path.ptr),
: "a7", "a1"
);
var s3_buf: [128]u8 = undefined;
const s3 = std.fmt.bufPrint(&s3_buf, "Resource opened, handle = {d}", .{handle}) catch unreachable;
asm volatile (
\\ li a7, 100000
\\ ecall
:
: [s] "{a0}" (s3.ptr),
[n] "{a1}" (s3.len),
: "a7"
);
var buf = [8]u8{ 1, 2, 3, 4, 5, 6, 7, 8 };
asm volatile (
\\ li a7, 100009
\\ ecall
:
: [handle] "{a0}" (handle),
[buffer] "{a1}" (&buf),
[len] "{a2}" (buf.len - 1),
);
var s4_buf: [384]u8 = undefined;
const s4 = std.fmt.bufPrint(&s4_buf, "Bytes after reading: {any}\r\n", .{buf}) catch unreachable;
asm volatile (
\\ li a7, 100000
\\ ecall
:
: [s] "{a0}" (s4.ptr),
[n] "{a1}" (s4.len),
: "a7"
);
}
pub export fn read(ptr: [*]u8, len: usize) Result {
const buffer = ptr[0..len];
for (buffer, 0..) |_, i| {
buffer[i] = 0;
}
return .{
.value = buffer.len,
.status = 0,
};
}
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