const std = @import("../std.zig");
const builtin = @import("builtin");
const io = std.io;
const testing = std.testing;
const os = std.os;
pub const CWriter = io.Writer(*std.c.FILE, std.fs.File.WriteError, cWriterWrite);
pub fn cWriter(c_file: *std.c.FILE) CWriter {
return .{ .context = c_file };
}
fn cWriterWrite(c_file: *std.c.FILE, bytes: []const u8) std.fs.File.WriteError!usize {
const amt_written = std.c.fwrite(bytes.ptr, 1, bytes.len, c_file);
if (amt_written >= 0) return amt_written;
switch (@intToEnum(os.E, std.c._errno().*)) {
.SUCCESS => unreachable,
.INVAL => unreachable,
.FAULT => unreachable,
.AGAIN => unreachable,
.BADF => unreachable,
.DESTADDRREQ => unreachable,
.DQUOT => return error.DiskQuota,
.FBIG => return error.FileTooBig,
.IO => return error.InputOutput,
.NOSPC => return error.NoSpaceLeft,
.PERM => return error.AccessDenied,
.PIPE => return error.BrokenPipe,
else => |err| return os.unexpectedErrno(err),
}
}
test "C Writer" {
if (!builtin.link_libc or builtin.os.tag == .wasi) return error.SkipZigTest;
const filename = "tmp_io_test_file.txt";
const out_file = std.c.fopen(filename, "w") orelse return error.UnableToOpenTestFile;
defer {
_ = std.c.fclose(out_file);
std.fs.cwd().deleteFileZ(filename) catch {};
}
const writer = cWriter(out_file);
try writer.print("hi: {}\n", .{@as(i32, 123)});
}