Replace compute.c with compute.zig

Author: tiehuis

build.zig

@@ -2,12 +2,12 @@ const Builder = @import("std").build.Builder;
 
 pub fn build(b: &Builder) {
     const exe = b.addCExecutable("main");
+    b.addCIncludePath(".");
     exe.addCompileFlags([][]const u8 {
         "-std=c99"
     });
 
     const source_files = [][]const u8 {
-        "compute.c",
         "compute_helper.c",
         "display.c",
         "main.c"
@@ -17,6 +17,15 @@ pub fn build(b: &Builder) {
         exe.addSourceFile(source);
     }
 
+    const zig_source_files = [][]const u8 {
+        "compute.zig",
+    };
+
+    for (zig_source_files) |source| {
+        const object = b.addObject(source, source);
+        exe.addObject(object);
+    }
+
     exe.setOutputPath("./main");
     b.default_step.dependOn(&exe.step);
 }

compute.c

@@ -0,0 +1,5 @@
+pub use @cImport(@cInclude("compute_helper.h"));
+
+export fn compute(a: u8) -> u8 {
+    compute_helper(a) + 5
+}