Zig 0.17.0-dev (Split by item)

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alignInBytes

Returns the largest slice in the given bytes that conforms to the new alignment, or null if the given bytes contain no conforming address.

mem.alignInBytes

pub fn alignInBytes(bytes: []u8, comptime new_alignment: usize) ?[]align(new_alignment) u8

File

lib/std/mem.zig:4972

Code

pub fn alignInBytes(bytes: []u8, comptime new_alignment: usize) ?[]align(new_alignment) u8 {
    const begin_address = @intFromPtr(bytes.ptr);
    const end_address = begin_address + bytes.len;

    const begin_address_aligned = mem.alignForward(usize, begin_address, new_alignment);
    const new_length = std.math.sub(usize, end_address, begin_address_aligned) catch |e| switch (e) {
        error.Overflow => return null,
    };
    const alignment_offset = begin_address_aligned - begin_address;
    return @alignCast(bytes[alignment_offset .. alignment_offset + new_length]);
}