Function createEnvironFromMap [src]

Creates a null-delimited environment variable block in the format expected by POSIX, from a hash map plus options.

Prototype

 pub fn createEnvironFromMap( arena: Allocator, map: *const EnvMap, options: CreateEnvironOptions, ) Allocator.Error![:null]?[*:0]u8

Parameters

arena: Allocatormap: *const EnvMapoptions: CreateEnvironOptions

Source

  pub fn createEnvironFromMap(
    arena: Allocator,
    map: *const EnvMap,
    options: CreateEnvironOptions,
) Allocator.Error![:null]?[*:0]u8 {
    const ZigProgressAction = enum { nothing, edit, delete, add };
    const zig_progress_action: ZigProgressAction = a: {
        const fd = options.zig_progress_fd orelse break :a .nothing;
        const contains = map.get("ZIG_PROGRESS") != null;
        if (fd >= 0) {
            break :a if (contains) .edit else .add;
        } else {
            if (contains) break :a .delete;
        }
        break :a .nothing;
    };

    const envp_count: usize = c: {
        var count: usize = map.count();
        switch (zig_progress_action) {
            .add => count += 1,
            .delete => count -= 1,
            .nothing, .edit => {},
        }
        break :c count;
    };

    const envp_buf = try arena.allocSentinel(?[*:0]u8, envp_count, null);
    var i: usize = 0;

    if (zig_progress_action == .add) {
        envp_buf[i] = try std.fmt.allocPrintZ(arena, "ZIG_PROGRESS={d}", .{options.zig_progress_fd.?});
        i += 1;
    }

    {
        var it = map.iterator();
        while (it.next()) |pair| {
            if (mem.eql(u8, pair.key_ptr.*, "ZIG_PROGRESS")) switch (zig_progress_action) {
                .add => unreachable,
                .delete => continue,
                .edit => {
                    envp_buf[i] = try std.fmt.allocPrintZ(arena, "{s}={d}", .{
                        pair.key_ptr.*, options.zig_progress_fd.?,
                    });
                    i += 1;
                    continue;
                },
                .nothing => {},
            };

            envp_buf[i] = try std.fmt.allocPrintZ(arena, "{s}={s}", .{ pair.key_ptr.*, pair.value_ptr.* });
            i += 1;
        }
    }

    assert(i == envp_count);
    return envp_buf;
}  