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HelloWorldJExtract.java
39 lines (33 loc) · 1.12 KB
/
HelloWorldJExtract.java
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package me.bechberger.panama;
import me.bechberger.panama.raw.Lib;
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.ValueLayout;
public class HelloWorldJExtract {
public static void main(String[] args) {
var file = fopen(args[0], "r");
var line = gets(file, 1024);
System.out.println(line);
fclose(file);
}
public static MemorySegment fopen(String filename, String mode) {
try (var arena = Arena.ofConfined()) {
return Lib.fopen(
arena.allocateUtf8String(filename),
arena.allocateUtf8String(mode));
}
}
public static int fclose(MemorySegment file) {
return Lib.fclose(file);
}
public static String gets(MemorySegment file, int size) {
try (var arena = Arena.ofConfined()) {
var buffer = arena.allocateArray(ValueLayout.JAVA_BYTE, size);
var ret = Lib.fgets(buffer, size, file);
if (ret == MemorySegment.NULL) {
return null;
}
return buffer.getUtf8String(0);
}
}
}