Основы языка Zig — Практический пример — CLI-утилита для чтения файла

const std = @import("std");

fn readFile(allocator: std.mem.Allocator, path: []const u8) ![]u8 {
    const file = try std.fs.cwd().openFile(path, .{});
    defer file.close();

    const stat = try file.stat();
    const buffer = try allocator.alloc(u8, stat.size);
    _ = try file.readAll(buffer);
    return buffer;
}

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();
    const allocator = gpa.allocator();

    const args = try std.process.argsAlloc(allocator);
    defer std.process.argsFree(allocator, args);

    if (args.len != 2) {
        std.debug.print("Использование: catfile <путь_к_файлу>\n", .{});
        return;
    }

    const content = try readFile(allocator, args[1]);
    defer allocator.free(content);

    const stdout = std.io.getStdOut().writer();
    try stdout.writeAll(content);
}