50 lines
1.2 KiB
Zig
50 lines
1.2 KiB
Zig
const debug = @import("debug.zig");
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const mem = @import("mem.zig");
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const assert = debug.assert;
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pub fn len(ptr: &const u8) -> usize {
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var count: usize = 0;
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while (ptr[count] != 0) : (count += 1) {}
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return count;
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}
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pub fn cmp(a: &const u8, b: &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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pub fn toSliceConst(str: &const u8) -> []const u8 {
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return str[0..len(str)];
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}
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pub fn toSlice(str: &u8) -> []u8 {
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return str[0..len(str)];
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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() {
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assert(cmp(c"aoeu", c"aoez") == -1);
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assert(len(c"123456789") == 9);
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}
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/// Returns a mutable slice with exactly the same size which is guaranteed to
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/// have a null byte after it.
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/// Caller owns the returned memory.
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pub fn addNullByte(allocator: &mem.Allocator, slice: []const u8) -> %[]u8 {
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const result = %return 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;
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}
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