From: Olaf Wintermann <olaf.wintermann@gmail.com>
Date: Thu, 26 Jun 2025 17:47:53 +0000 (+0200)
Subject: add CUtils
X-Git-Url: https://uap-core.de/gitweb/?a=commitdiff_plain;h=7fb6672a75fc81a1d51542002625fba2b7026b63;p=rssreader.git

add CUtils
---

diff --git a/ui-java/src/main/java/de/unixwork/ui/CUtils.java b/ui-java/src/main/java/de/unixwork/ui/CUtils.java
new file mode 100644
index 0000000..0be062c
--- /dev/null
+++ b/ui-java/src/main/java/de/unixwork/ui/CUtils.java
@@ -0,0 +1,30 @@
+package de.unixwork.ui;
+
+import java.lang.foreign.Arena;
+import java.lang.foreign.MemorySegment;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+
+import static java.lang.foreign.Arena.global;
+
+public class CUtils {
+    public static MemorySegment cstring(String s) {
+        if(s == null) {
+            return MemorySegment.NULL;
+        }
+        ToolkitFuncs tk = ToolkitFuncs.getInstance();
+
+        byte[] utf8 = s.getBytes(StandardCharsets.UTF_8);
+        try {
+            long size = utf8.length + 1;
+            MemorySegment cstr = (MemorySegment) tk.malloc.invoke(size);
+            MemorySegment segment = MemorySegment.ofAddress(cstr.address());
+            ByteBuffer buf = segment.asByteBuffer();
+            buf.put(utf8);
+            buf.put((byte) 0);
+            return cstr;
+        } catch (Throwable e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
diff --git a/ui-java/src/main/java/de/unixwork/ui/ToolkitFuncs.java b/ui-java/src/main/java/de/unixwork/ui/ToolkitFuncs.java
index 8779c34..9dd4ea9 100644
--- a/ui-java/src/main/java/de/unixwork/ui/ToolkitFuncs.java
+++ b/ui-java/src/main/java/de/unixwork/ui/ToolkitFuncs.java
@@ -40,6 +40,10 @@ public class ToolkitFuncs {
     public MethodHandle text_set;
     public MethodHandle text_get;
 
+    // some libc stuff
+    public MethodHandle malloc;
+    public MethodHandle free;
+
     private ToolkitFuncs(Linker linker, SymbolLookup lib) {
         // void* func(void*)
         FunctionDescriptor sigm_m = FunctionDescriptor.of(ValueLayout.ADDRESS, ValueLayout.ADDRESS);
@@ -47,6 +51,7 @@ public class ToolkitFuncs {
         FunctionDescriptor sigm_mm = FunctionDescriptor.of(ValueLayout.ADDRESS, ValueLayout.ADDRESS);
         FunctionDescriptor sigv_mm = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS, ValueLayout.ADDRESS);
         FunctionDescriptor sigv_m = FunctionDescriptor.ofVoid(ValueLayout.ADDRESS);
+        FunctionDescriptor sigm_l = FunctionDescriptor.of(ValueLayout.ADDRESS, ValueLayout.JAVA_LONG);
 
         MemorySegment object_get_context_addr = lib.find("ui_object_get_context").orElseThrow();
 
@@ -82,6 +87,9 @@ public class ToolkitFuncs {
         MemorySegment text_set_addr = lib.find("ui_text_set").orElseThrow();
         MemorySegment text_get_addr = lib.find("ui_text_get").orElseThrow();
 
+        MemorySegment malloc_addr = lib.find("malloc").orElseThrow();
+        MemorySegment free_addr = lib.find("free").orElseThrow();
+
         object_get_context = linker.downcallHandle(object_get_context_addr, sigm_m);
 
         // use JAVA_LONG for size_t, because we don't support 32bit platforms
@@ -116,6 +124,9 @@ public class ToolkitFuncs {
         double_get = linker.downcallHandle(double_get_addr, FunctionDescriptor.of(ValueLayout.JAVA_DOUBLE, ValueLayout.ADDRESS));
         text_set = linker.downcallHandle(text_set_addr, sigv_mm);
         text_get = linker.downcallHandle(text_get_addr, sigm_m);
+
+        malloc = linker.downcallHandle(malloc_addr, sigm_l);
+        free = linker.downcallHandle(free_addr, sigv_m);
     }
 
     static ToolkitFuncs getInstance() {