3 files changed, 11 insertions, 10 deletions

diff --git a/src/CodePoint.zig b/src/CodePoint.zig
index 1c1bec1..62dd793 100644
--- a/src/CodePoint.zig
+++ b/src/CodePoint.zig
@@ -18,11 +18,11 @@ pub const CodePointIterator = struct {
 
         if (self.bytes[self.i] < 128) {
             // ASCII fast path
-            defer self.i += 1;
+            self.i += 1;
             return .{
-                .code = self.bytes[self.i],
+                .code = self.bytes[self.i - 1],
                 .len = 1,
-                .offset = self.i,
+                .offset = self.i - 1,
             };
         }
 
diff --git a/src/display_width.zig b/src/display_width.zig
index 2ac7093..ba76052 100644
--- a/src/display_width.zig
+++ b/src/display_width.zig
@@ -22,16 +22,17 @@ fn isAsciiOnly(str: []const u8) bool {
     } else true;
 
     const Vec = @Vector(vec_len, u8);
-    var i: usize = 0;
+    var remaining = str;
 
-    while (i < str.len) : (i += vec_len) {
-        if (str[i..].len < vec_len) return for (str[i..]) |b| {
+    while (true) {
+        if (remaining.len < vec_len) return for (remaining) |b| {
             if (b > 127) break false;
         } else true;
 
-        const v1 = str[0..vec_len].*;
+        const v1 = remaining[0..vec_len].*;
         const v2: Vec = @splat(127);
         if (@reduce(.Or, v1 > v2)) return false;
+        remaining = remaining[vec_len..];
     }
 
     return true;
diff --git a/src/main.zig b/src/main.zig
index 38ba343..7ff07ee 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -6,7 +6,7 @@ const std = @import("std");
 // const codePointWidth = @import("display_width").codePointWidth;
 // const strWidth = @import("ziglyph").display_width.strWidth;
 const strWidth = @import("display_width").strWidth;
-const CodePointIterator = @import("CodePoint").CodePointIterator;
+// const CodePointIterator = @import("CodePoint").CodePointIterator;
 
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@@ -16,12 +16,12 @@ pub fn main() !void {
     const input = try std.fs.cwd().readFileAlloc(allocator, "lang_mix.txt", std.math.maxInt(u32));
     defer allocator.free(input);
 
-    var result: usize = 0;
-    // var result: isize = 0;
     // var iter = GraphemeIterator.init(input);
     // var iter = CodePointIterator{ .bytes = input };
     var iter = std.mem.splitScalar(u8, input, '\n');
 
+    var result: usize = 0;
+    // var result: isize = 0;
     var timer = try std.time.Timer.start();
 
     // for (0..50) |_| {