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//! Location utilities
const afs = @import("../../fs/afs/afs.zig");
const ahci = @import("../../drivers/ahci/ahci.zig");
const compare = @import("../string/compare.zig");
const kata_mod = @import("../../kata/kata.zig");
const fs_limits = @import("../../common/limits/fs.zig");
const DEVICE_PREFIX = "/system/devices/";
pub fn resolve_to_cluster(
fs: *afs.AFS(ahci.BlockDevice),
location: []const u8,
current_cluster: u64,
) ?u32 {
const current: u32 = if (current_cluster == 0) fs.root_cluster else @as(u32, @intCast(current_cluster));
if (location.len == 0) return current;
if (location.len == 1 and location[0] == '^') {
return fs.get_parent_cluster(current) orelse fs.root_cluster;
}
var cluster: u32 = undefined;
var start: usize = 0;
if (location[0] == '/') {
cluster = fs.root_cluster;
start = 1;
} else {
cluster = current;
}
if (start >= location.len) return cluster;
var i: usize = start;
while (i <= location.len) : (i += 1) {
const is_end = (i == location.len);
const is_slash = !is_end and location[i] == '/';
if (is_slash or is_end) {
if (i > start) {
const component = location[start..i];
if (compare.equals(component, "^")) {
cluster = fs.get_parent_cluster(cluster) orelse fs.root_cluster;
} else {
const entry = fs.find_entry(cluster, component) orelse return null;
if (!entry.is_stack()) return null;
cluster = entry.first_cluster;
}
}
start = i + 1;
}
}
return cluster;
}
pub const Canonical = struct {
buf: [fs_limits.MAX_LOCATION_LENGTH]u8,
len: usize,
pub fn slice(self: *const Canonical) []const u8 {
return self.buf[0..self.len];
}
};
pub fn canonicalize(current: []const u8, location: []const u8) Canonical {
var result: Canonical = .{ .buf = undefined, .len = 0 };
if (location.len == 1 and location[0] == '^') {
@memcpy(result.buf[0..current.len], current);
result.len = current.len;
strip_last(&result);
return result;
}
if (location.len > 0 and location[0] == '/') {
result.buf[0] = '/';
result.len = 1;
process_components(&result, location[1..]);
return result;
}
@memcpy(result.buf[0..current.len], current);
result.len = current.len;
process_components(&result, location);
return result;
}
fn strip_last(result: *Canonical) void {
if (result.len > 1) {
result.len -= 1;
while (result.len > 1 and result.buf[result.len - 1] != '/') {
result.len -= 1;
}
if (result.len > 1) result.len -= 1;
}
if (result.len == 0) {
result.buf[0] = '/';
result.len = 1;
}
}
fn process_components(result: *Canonical, location: []const u8) void {
var i: usize = 0;
while (i < location.len) {
while (i < location.len and location[i] == '/') : (i += 1) {}
if (i >= location.len) break;
const start = i;
while (i < location.len and location[i] != '/') : (i += 1) {}
const component = location[start..i];
if (compare.equals(component, "^")) {
strip_last(result);
} else {
if (result.len > 1) {
result.buf[result.len] = '/';
result.len += 1;
}
for (component) |c| {
if (result.len < fs_limits.MAX_LOCATION_LENGTH) {
result.buf[result.len] = c;
result.len += 1;
}
}
}
}
}
pub fn resolve(kata: *kata_mod.Kata, location: []const u8, buffer: []u8) []const u8 {
if (location.len > 0 and location[0] == '/') {
@memcpy(buffer[0..location.len], location);
return buffer[0..location.len];
}
const cwd = kata.current_location[0..kata.current_location_len];
var len: usize = cwd.len;
@memcpy(buffer[0..cwd.len], cwd);
if (cwd[cwd.len - 1] != '/') {
buffer[len] = '/';
len += 1;
}
@memcpy(buffer[len .. len + location.len], location);
len += location.len;
return buffer[0..len];
}
pub fn is_device(location: []const u8) bool {
return compare.starts_with(location, DEVICE_PREFIX);
}
pub fn device_name(location: []const u8) []const u8 {
return location[DEVICE_PREFIX.len..];
}
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