130 lines
3.8 KiB
Plaintext
130 lines
3.8 KiB
Plaintext
const std = #import("std");
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const Allocator = std.Allocator;
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const current = #import("builtin").os;
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const system = switch (current) {
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.linux => linux,
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.macos => macos,
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.windows => windows,
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};
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const write = fn (file_descriptor: FileDescriptor, bytes_ptr: [&]const u8, bytes_len: usize) ssize {
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switch (current) {
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.linux => return #syscall(1, file_descriptor, #cast(bytes_ptr), bytes_len),
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.macos => return macos.write(file_descriptor, #cast(bytes_ptr), bytes_len),
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.windows => {
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var written_bytes: u32 = 0;
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if (windows.WriteFile(file_descriptor, bytes_ptr, bytes_len, written_bytes.&, false) != 0) {
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return written_bytes;
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} else {
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unreachable;
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}
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},
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}
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}
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const FileDescriptor = system.FileDescriptor;
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const print = fn(bytes_ptr: [&]const u8, bytes_len: usize) void {
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const file_descriptor = switch (current) {
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.linux, .macos => 2,
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.windows => windows.GetStdHandle(windows.STD_OUTPUT_HANDLE),
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};
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_ = write(file_descriptor, bytes_ptr, bytes_len);
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}
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const exit = fn(exit_code: s32) noreturn {
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switch (current) {
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.linux => _ = #syscall(231, exit_code),
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.macos => macos.exit(exit_code),
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.windows => windows.ExitProcess(exit_code),
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}
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unreachable;
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}
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const ProtectionFlags = struct(u32){
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read: bool,
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write: bool,
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execute: bool,
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};
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const MapFlags = struct(u32){
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reserve: bool,
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commit: bool,
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};
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const allocate_virtual_memory = fn(address: ?[&]u8, length: usize, general_protection_flags: ProtectionFlags, general_map_flags: MapFlags) ?[&]u8 {
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const protection_flags = system.get_protection_flags(flags = general_protection_flags);
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const map_flags = system.get_map_flags(flags = general_map_flags);
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switch (current) {
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.linux => {
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if (linux.unwrapSyscall(syscall_result = linux.mmap(address, length, protection_flags, map_flags, fd = -1, offset = 0))) |result_address| {
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const pointer: [&]u8 = #cast(result_address);
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return pointer;
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} else {
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return null;
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}
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},
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else => #error("OS not supported"),
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}
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}
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const free_virtual_memory = fn(bytes_ptr: [&]const u8, bytes_len: usize) bool {
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switch (current) {
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.linux => {
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if (linux.unwrapSyscall(syscall_result = linux.munmap(bytes_ptr, bytes_len))) |result| {
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return result == 0;
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} else {
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return false;
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}
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},
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else => #error("OS not supported"),
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}
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}
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const readlink = fn(file_path: [&:0]const u8, buffer: []u8) ?[]u8 {
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switch (current) {
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.linux => {
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const raw_result = linux.readlink(file_path, bytes_ptr = buffer.ptr, bytes_len = buffer.len);
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if (linux.unwrapSyscall(syscall_result = raw_result)) |byte_count| {
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const bytes = buffer[0..byte_count];
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return bytes;
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} else {
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return null;
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}
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},
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else => #error("OS not supported"),
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}
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}
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const max_path_byte_count = switch (current) {
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.linux => 0x1000,
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else => #error("OS not supported"),
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};
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const currentExecutablePath = fn(allocator: &Allocator) ?[]u8 {
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switch (current) {
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.linux => {
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var buffer: [max_path_byte_count]u8 = undefined;
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if (readlink(file_path = "/proc/self/exe", buffer = buffer.&)) |bytes| {
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if (allocator.duplicateBytes(bytes)) |result| {
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return result;
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} else {
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return null;
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}
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} else {
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return null;
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}
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},
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else => #error("OS not supported"),
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}
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}
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const linux = #import("os/linux.nat");
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const macos = #import("os/macos.nat");
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const windows = #import("os/windows.nat");
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