kssreeram

#import <Cocoa/Cocoa.h>
#import <MetalKit/MetalKit.h>


//
// Compile and run:
//
// clang -O2 -fobjc-arc metal-mouse-lag.m -framework AppKit -framework Metal -framework MetalKit
// ./a.out
//

kssreeram

//
// Adding zero to a null-pointer is undefined behavior!
//
// In the following code, String a is dynamically sized array of chars.
// UB is triggerred when appending an empty string to an freshly initialized String.
// See line 50.
//
// What is the recommended approach to avoid this error?
//
// Compile and run with:

kssreeram

Grapheme clustering in Swift and ObjC produce different output!

This swift program:

let s = "வணக்கம்" // This is a word in the Tamil language.
var n = 0
for cluster in Array(s) {
    print("cluster \(n) = '\(cluster)'")
    n += 1
}

kssreeram

diff --git a/sokol/sokol_app.h b/sokol/sokol_app.h
index 0115970..149c336 100644
--- a/sokol/sokol_app.h
+++ b/sokol/sokol_app.h
@@ -3016,7 +3016,17 @@ _SOKOL_PRIVATE void _sapp_macos_frame(void) {
     _sapp.macos.win_dlg = [[_sapp_macos_window_delegate alloc] init];
     _sapp.macos.window.delegate = _sapp.macos.win_dlg;
     #if defined(SOKOL_METAL)
-        _sapp.macos.mtl_device = MTLCreateSystemDefaultDevice();
+        id<MTLDevice> chosen = nil;

kssreeram

//
// This appears to be a bug in MTKView.
//
// To reproduce the bug:
//   1. Create a zero-sized window.
//   2. Add MTKView to window.
//   3. Set window size to a non-zero value.
//
// The MTKView never displays its content!
// It's as if the MTKView doesn't even exist.

kssreeram

#import <AppKit/AppKit.h>

int main() {
    while (1) {
        NSColor *color1 = [NSColor textColor];
        NSColor *color2 = [color1 colorUsingColorSpace:[NSColorSpace deviceRGBColorSpace]];
        CGFloat r, g, b, a;
        [color2 getRed:&r green:&g blue:&b alpha:&a];
        printf("text-color: (%f, %f, %f, %f)\n", r, g, b, a);
        [NSThread sleepForTimeInterval:1.0];

kssreeram

#include <stdio.h>
#include <stdlib.h>

int is_space[256];
int next_states[3 * 2];
int increments[3];

void initialize_tables(void) {
    is_space[' '] = 1;
    is_space['\n'] = 1;

kssreeram

#include <stdio.h>
#include <stdlib.h>

int is_space(unsigned char ch) {
    return (ch == ' ') || (ch == '\n') || (ch == '\r') || (ch == '\t');
}

long count_words(unsigned char *ptr_begin, unsigned char *ptr_end) {
    long n = 0;
    unsigned char *ptr = ptr_begin;

kssreeram

/*

This program triggers a bug in Clang when compiling with optimizations.

When compiling with no-optimizations, the correct output is produced.

    $ clang -O0 test-bug.c && ./a.out
    value = 1

kssreeram

Modeling C Ambiguity.