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const std = @import("std");
const Allocator = std.mem.Allocator;
const ArrayList = std.ArrayList;
const print = std.debug.print;
const c = @cImport({
@cInclude("errno.h");
@cInclude("stdio.h");
if (@import("builtin").os.tag != .windows) {
@cInclude("sys/statvfs.h");
}
});
const paths = @import("../paths.zig");
const formatDosPath = paths.formatDosPath;
const convertTo83 = paths.convertTo83;
const types = @import("./lib/types.zig");
const CommandStatus = types.CommandStatus;
const CommandContext = types.CommandContext;
const OutputCapture = types.OutputCapture;
const InputSource = types.InputSource;
fn formatDosDateTime(allocator: Allocator, timestamp_secs: i64) ![]const u8 {
const epoch_seconds = @as(u64, @intCast(@max(timestamp_secs, 0)));
const epoch_day = @divFloor(epoch_seconds, std.time.s_per_day);
const day_seconds = epoch_seconds % std.time.s_per_day;
// Calculate date (simplified)
var year: u32 = 1970; // Start from Unix epoch year
var remaining_days = epoch_day;
// Simple year calculation
while (remaining_days >= 365) {
const days_in_year: u64 = if (isLeapYear(year)) 366 else 365;
if (remaining_days < days_in_year) break;
remaining_days -= days_in_year;
year += 1;
}
// Simple month/day calculation (approximate)
const month = @min(@divFloor(remaining_days, 30) + 1, 12);
const day = @min(remaining_days % 30 + 1, 31);
// Calculate time
const hours = day_seconds / std.time.s_per_hour;
const minutes = (day_seconds % std.time.s_per_hour) / std.time.s_per_min;
// Format as MM-DD-YY HH:MMa (DOS style)
const am_pm = if (hours < 12) "a" else "p";
const display_hour = if (hours == 0) 12 else if (hours > 12) hours - 12 else hours;
return try std.fmt.allocPrint(allocator, "{d:0>2}-{d:0>2}-{d:0>2} {d:>2}:{d:0>2}{s}", .{ @as(u32, @intCast(month)), @as(u32, @intCast(day)), @as(u32, @intCast(year % 100)), @as(u32, @intCast(display_hour)), @as(u32, @intCast(minutes)), am_pm });
}
fn isLeapYear(year: u32) bool {
return (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0);
}
const GetFreeDiskSpaceError = error{ NotImplemented, AccessDenied };
fn getFreeDiskSpace(path: []const u8) GetFreeDiskSpaceError!u64 {
if (@import("builtin").os.tag == .windows) {
return error.NotImplemented;
}
var stat: c.struct_statvfs = undefined;
if (c.statvfs(path.ptr, &stat) != 0) {
_ = c.perror("statvfs");
return error.AccessDenied;
}
return stat.f_bsize * stat.f_bfree;
}
pub const Dir = struct {
path: []const u8,
pub fn eval(dir: Dir, ctx: CommandContext) !CommandStatus {
var output_buffer = ArrayList(u8).init(ctx.allocator);
defer output_buffer.deinit();
// Format path in DOS style with backslashes and uppercase drive letter
const formatted_path = try formatDosPath(ctx.allocator, dir.path);
defer ctx.allocator.free(formatted_path);
// Get volume label (simplified - just show drive)
const drive_letter = if (formatted_path.len >= 2 and formatted_path[1] == ':')
formatted_path[0]
else
'C';
try output_buffer.writer().print(" Volume in drive {c} has no label\n", .{drive_letter});
try output_buffer.writer().print(" Volume Serial Number is 1234-5678\n", .{});
try output_buffer.writer().print("\n Directory of {s}\n\n", .{formatted_path});
var dir_iterator = std.fs.cwd().openDir(dir.path, .{ .iterate = true }) catch {
const error_msg = "File not found\n";
if (ctx.output_capture) |capture| {
try capture.write(error_msg);
} else {
print("{s}", .{error_msg});
}
return CommandStatus{ .Code = 1 };
};
defer dir_iterator.close();
var iterator = dir_iterator.iterate();
var file_count: u32 = 0;
var dir_count: u32 = 0;
var total_file_bytes: u64 = 0;
while (try iterator.next()) |entry| {
const stat = dir_iterator.statFile(entry.name) catch continue;
// Convert timestamp to DOS date/time format
const mtime_secs = @divFloor(stat.mtime, std.time.ns_per_s);
const date_time = try formatDosDateTime(ctx.allocator, @intCast(mtime_secs));
defer ctx.allocator.free(date_time);
// Convert filename to 8.3 format
const short_name = try convertTo83(ctx.allocator, entry.name);
defer ctx.allocator.free(short_name);
switch (entry.kind) {
.directory => {
try output_buffer.writer().print("{s} <DIR> {s}\n", .{ date_time, short_name });
dir_count += 1;
},
.file => {
try output_buffer.writer().print("{s} {d:>14} {s}\n", .{ date_time, stat.size, short_name });
file_count += 1;
total_file_bytes += stat.size;
},
else => {},
}
}
// Get free disk space using statvfs
const path = try std.fs.cwd().realpathAlloc(ctx.allocator, dir.path);
defer ctx.allocator.free(path);
const bytes_free = getFreeDiskSpace(path) catch |err| switch (err) {
error.AccessDenied => 0,
error.NotImplemented => 0,
};
try output_buffer.writer().print(" {d} File(s) {d:>14} bytes\n", .{ file_count, total_file_bytes });
try output_buffer.writer().print(" {d} Dir(s) {d:>14} bytes free\n", .{ dir_count, bytes_free });
if (ctx.output_capture) |capture| {
try capture.write(output_buffer.items);
} else {
print("{s}", .{output_buffer.items});
}
return CommandStatus{ .Code = 0 };
}
};
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