109 lines
3.0 KiB
Zig
109 lines
3.0 KiB
Zig
const std = @import("index.zig");
|
|
const builtin = @import("builtin");
|
|
const debug = std.debug;
|
|
const mem = std.mem;
|
|
const assert = debug.assert;
|
|
|
|
pub const line_sep = switch (builtin.os) {
|
|
builtin.Os.windows => "\r\n",
|
|
else => "\n",
|
|
};
|
|
|
|
pub fn len(ptr: [*]const u8) usize {
|
|
var count: usize = 0;
|
|
while (ptr[count] != 0) : (count += 1) {}
|
|
return count;
|
|
}
|
|
|
|
pub fn cmp(a: [*]const u8, b: [*]const u8) i8 {
|
|
var index: usize = 0;
|
|
while (a[index] == b[index] and a[index] != 0) : (index += 1) {}
|
|
if (a[index] > b[index]) {
|
|
return 1;
|
|
} else if (a[index] < b[index]) {
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
pub fn toSliceConst(str: [*]const u8) []const u8 {
|
|
return str[0..len(str)];
|
|
}
|
|
|
|
pub fn toSlice(str: [*]u8) []u8 {
|
|
return str[0..len(str)];
|
|
}
|
|
|
|
test "cstr fns" {
|
|
comptime testCStrFnsImpl();
|
|
testCStrFnsImpl();
|
|
}
|
|
|
|
fn testCStrFnsImpl() void {
|
|
assert(cmp(c"aoeu", c"aoez") == -1);
|
|
assert(len(c"123456789") == 9);
|
|
}
|
|
|
|
/// Returns a mutable slice with 1 more byte of length which is a null byte.
|
|
/// Caller owns the returned memory.
|
|
pub fn addNullByte(allocator: *mem.Allocator, slice: []const u8) ![]u8 {
|
|
const result = try allocator.alloc(u8, slice.len + 1);
|
|
mem.copy(u8, result, slice);
|
|
result[slice.len] = 0;
|
|
return result;
|
|
}
|
|
|
|
pub const NullTerminated2DArray = struct {
|
|
allocator: *mem.Allocator,
|
|
byte_count: usize,
|
|
ptr: ?[*]?[*]u8,
|
|
|
|
/// Takes N lists of strings, concatenates the lists together, and adds a null terminator
|
|
/// Caller must deinit result
|
|
pub fn fromSlices(allocator: *mem.Allocator, slices: []const []const []const u8) !NullTerminated2DArray {
|
|
var new_len: usize = 1; // 1 for the list null
|
|
var byte_count: usize = 0;
|
|
for (slices) |slice| {
|
|
new_len += slice.len;
|
|
for (slice) |inner| {
|
|
byte_count += inner.len;
|
|
}
|
|
byte_count += slice.len; // for the null terminators of inner
|
|
}
|
|
|
|
const index_size = @sizeOf(usize) * new_len; // size of the ptrs
|
|
byte_count += index_size;
|
|
|
|
const buf = try allocator.alignedAlloc(u8, @alignOf(?*u8), byte_count);
|
|
errdefer allocator.free(buf);
|
|
|
|
var write_index = index_size;
|
|
const index_buf = @bytesToSlice(?[*]u8, buf);
|
|
|
|
var i: usize = 0;
|
|
for (slices) |slice| {
|
|
for (slice) |inner| {
|
|
index_buf[i] = buf.ptr + write_index;
|
|
i += 1;
|
|
mem.copy(u8, buf[write_index..], inner);
|
|
write_index += inner.len;
|
|
buf[write_index] = 0;
|
|
write_index += 1;
|
|
}
|
|
}
|
|
index_buf[i] = null;
|
|
|
|
return NullTerminated2DArray{
|
|
.allocator = allocator,
|
|
.byte_count = byte_count,
|
|
.ptr = @ptrCast(?[*]?[*]u8, buf.ptr),
|
|
};
|
|
}
|
|
|
|
pub fn deinit(self: *NullTerminated2DArray) void {
|
|
const buf = @ptrCast([*]u8, self.ptr);
|
|
self.allocator.free(buf[0..self.byte_count]);
|
|
}
|
|
};
|