kb_exfiltrator/pointer_explanation.zig

const std = @import("std");

pub fn main() !void {
    // Example showing the conversion steps

    // Step 1: SQLite gives us this type (simplified)
    const sqlite_ptr: ?*const u8 = "hello";

    // Step 2: Check if it's not null
    if (sqlite_ptr != null) {
        // Step 3: Cast to sentinel-terminated pointer
        // @as(TargetType, value) - explicit type conversion
        // [*:0]const u8 - pointer to many u8s, terminated by 0
        const sentinel_ptr = @as([*:0]const u8, @ptrCast(sqlite_ptr));

        // Step 4: Convert sentinel pointer to slice
        // std.mem.span finds the 0 terminator and creates a slice
        const slice: []const u8 = std.mem.span(sentinel_ptr);

        std.debug.print("Slice: {s}, Length: {}\n", .{slice, slice.len});
    }

    // The one-liner version from our code:
    const text = if (sqlite_ptr != null)
        std.mem.span(@as([*:0]const u8, @ptrCast(sqlite_ptr)))
    else
        "";
}