start with hello world in C

Tupfile.rules

@@ -1,3 +1 @@
-.gitignore
-
-: foreach *.wast |> wat2wasm -o %o %f |> %B.wasm
+.gitignore

cmd/land/Tupfile

@@ -1,4 +1,4 @@
 include_rules
 
-: *_test.go | testdata/arbint.wasm testdata/struct.wasm |> vgo test -v -cover -race -o %o |> ../../bin/%d.test
+: *_test.go | testdata/*.wasm |> vgo test -v -cover -race -o %o |> ../../bin/%d.test
 : *.go |> vgo build -o %o |> ../../bin/land

cmd/land/testdata/Tupfile

@@ -4,4 +4,5 @@ CFLAGS += --target=wasm32-unknown-unknown-wasm
 CFLAGS += --sysroot=~/code/wasmception/sysroot/
 CFLAGS += -O0 -nostartfiles -Wl,--no-entry -nostdlib
 
+: foreach *.wast |> wat2wasm -o %o %f |> %B.wasm
 : foreach *.c |>  ~/code/wasmception/dist/bin/clang $(CFLAGS) %f -o %o |> %B.wasm

cmd/land/testdata/helloworld.c

@@ -0,0 +1,21 @@
+extern int open(const char *, int);
+extern int write(int, char *, int);
+extern int close(int);
+
+__attribute__ ((visibility ("default")))
+int main() {
+  const char *name = "hello";
+  char *msg = "Hello, world!";
+  int fd = open(name, 0x42);
+  int num = write(fd, msg, 13);
+  if (num == 0) {
+    return 1;
+  }
+
+  num = close(fd);
+  if (num == 0) {
+    return 1;
+  }
+
+  return 0;
+}

cmd/land/testdata/land.h

@@ -0,0 +1,9 @@
+#define export __attribute__ ((visibility ("default"))
+#define import extern
+
+import int close(int file);
+import int isatty(int file);
+import int open(const char *name, int flags, ...);
+import int read(int file, char *ptr, int len);
+import int write(int file, char *ptr, int len);
+import int unlink(char *name);