107 lines
3.3 KiB
Zig
107 lines
3.3 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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const std = @import("std.zig");
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const builtin = @import("builtin");
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const debug = std.debug;
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const mem = std.mem;
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const testing = std.testing;
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pub const line_sep = switch (builtin.os.tag) {
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.windows => "\r\n",
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else => "\n",
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};
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pub fn cmp(a: [*:0]const u8, b: [*:0]const u8) i8 {
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var index: usize = 0;
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while (a[index] == b[index] and a[index] != 0) : (index += 1) {}
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if (a[index] > b[index]) {
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return 1;
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} else if (a[index] < b[index]) {
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return -1;
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} else {
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return 0;
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}
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}
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test "cstr fns" {
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comptime testCStrFnsImpl();
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testCStrFnsImpl();
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}
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fn testCStrFnsImpl() void {
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testing.expect(cmp("aoeu", "aoez") == -1);
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testing.expect(mem.len("123456789") == 9);
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}
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/// Returns a mutable, null-terminated slice with the same length as `slice`.
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/// Caller owns the returned memory.
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pub fn addNullByte(allocator: *mem.Allocator, slice: []const u8) ![:0]u8 {
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const result = try allocator.alloc(u8, slice.len + 1);
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mem.copy(u8, result, slice);
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result[slice.len] = 0;
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return result[0..slice.len :0];
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}
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test "addNullByte" {
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const slice = try addNullByte(std.testing.allocator, "hello"[0..4]);
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defer std.testing.allocator.free(slice);
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testing.expect(slice.len == 4);
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testing.expect(slice[4] == 0);
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}
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pub const NullTerminated2DArray = struct {
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allocator: *mem.Allocator,
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byte_count: usize,
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ptr: ?[*:null]?[*:0]u8,
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/// Takes N lists of strings, concatenates the lists together, and adds a null terminator
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/// Caller must deinit result
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pub fn fromSlices(allocator: *mem.Allocator, slices: []const []const []const u8) !NullTerminated2DArray {
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var new_len: usize = 1; // 1 for the list null
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var byte_count: usize = 0;
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for (slices) |slice| {
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new_len += slice.len;
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for (slice) |inner| {
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byte_count += inner.len;
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}
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byte_count += slice.len; // for the null terminators of inner
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}
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const index_size = @sizeOf(usize) * new_len; // size of the ptrs
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byte_count += index_size;
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const buf = try allocator.alignedAlloc(u8, @alignOf(?*u8), byte_count);
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errdefer allocator.free(buf);
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var write_index = index_size;
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const index_buf = mem.bytesAsSlice(?[*]u8, buf);
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var i: usize = 0;
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for (slices) |slice| {
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for (slice) |inner| {
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index_buf[i] = buf.ptr + write_index;
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i += 1;
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mem.copy(u8, buf[write_index..], inner);
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write_index += inner.len;
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buf[write_index] = 0;
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write_index += 1;
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}
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}
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index_buf[i] = null;
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return NullTerminated2DArray{
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.allocator = allocator,
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.byte_count = byte_count,
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.ptr = @ptrCast(?[*:null]?[*:0]u8, buf.ptr),
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};
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}
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pub fn deinit(self: *NullTerminated2DArray) void {
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const buf = @ptrCast([*]u8, self.ptr);
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self.allocator.free(buf[0..self.byte_count]);
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}
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};
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