49 lines
1.8 KiB
Zig
49 lines
1.8 KiB
Zig
const std = @import("../std.zig");
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const OutStream = std.io.OutStream;
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const builtin = @import("builtin");
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const posix = std.os.posix;
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/// TODO make std.os.FILE use *FILE when linking libc and this just becomes
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/// std.io.FileOutStream because std.os.File.write would do this when linking
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/// libc.
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pub const COutStream = struct {
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pub const Error = std.os.File.WriteError;
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pub const Stream = OutStream(Error);
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stream: Stream,
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c_file: *std.c.FILE,
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pub fn init(c_file: *std.c.FILE) COutStream {
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return COutStream{
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.c_file = c_file,
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.stream = Stream{ .writeFn = writeFn },
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};
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}
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fn writeFn(out_stream: *Stream, bytes: []const u8) Error!void {
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const self = @fieldParentPtr(COutStream, "stream", out_stream);
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const amt_written = std.c.fwrite(bytes.ptr, 1, bytes.len, self.c_file);
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if (amt_written == bytes.len) return;
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// TODO errno on windows. should we have a posix layer for windows?
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if (builtin.os == .windows) {
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return error.InputOutput;
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}
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const errno = std.c._errno().*;
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switch (errno) {
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0 => unreachable,
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posix.EINVAL => unreachable,
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posix.EFAULT => unreachable,
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posix.EAGAIN => unreachable, // this is a blocking API
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posix.EBADF => unreachable, // always a race condition
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posix.EDESTADDRREQ => unreachable, // connect was never called
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posix.EDQUOT => return error.DiskQuota,
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posix.EFBIG => return error.FileTooBig,
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posix.EIO => return error.InputOutput,
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posix.ENOSPC => return error.NoSpaceLeft,
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posix.EPERM => return error.AccessDenied,
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posix.EPIPE => return error.BrokenPipe,
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else => return std.os.unexpectedErrorPosix(@intCast(usize, errno)),
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}
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}
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};
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