add syscall_stubs file

Makefile

@@ -5,14 +5,15 @@ TARGET_TRIPLE = wasm32-unknown-wasi
 CFLAGS = -nostartfiles -fvisibility=hidden
 LDFLAGS = -Wl,--no-entry,--demangle,--allow-undefined
 EXPORT_FUNCS = --export=allocate,--export=deallocate,--export=invoke
-SDK = sdk/allocator.c sdk/logger.c
+SDK = sdk/allocator.c sdk/logger.c sdk/syscalls_stubs.c
+SRC = src/main.c
 
 .PHONY: default all clean
 
 default: $(TARGET)
 all: default
 
-$(TARGET): main.c $(SDK)
+$(TARGET): $(SRC) $(SDK)
 	$(CC) --sysroot=$(SYSROOT) --target=$(TARGET_TRIPLE) $(CFLAGS) $(LDFLAGS) -Wl,$(EXPORT_FUNCS) $^ -o $@.wasm
 
 .PRECIOUS: $(TARGET)

main.c

@@ -1,7 +0,0 @@
-#include "sdk/allocator.h"
-#include "sdk/logger.h"
-#include "sdk/side_module_api.h"
-
-char *invoke(const char *str, int length) {
-
-}

sdk/side_module_api.h

@@ -2,7 +2,7 @@
 #define C_TEMPLATE_SIDE_MODULE_API_H
 
 #include <string.h>
-#include <sttlib.h>
+#include <stdlib.h>
 
 /*
  * Concatenate preprocessor tokens A and B without expanding macro definitions

sdk/syscalls_stubs.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+size_t __stdio_write(FILE *f, const unsigned char *buf, size_t len) {
+    return 1;
+}
+
+int __stdio_close(FILE *f) {
+    return 1;
+}
+
+off_t __stdio_seek(FILE *_f, off_t _offset, int _value) {
+    return 1;
+}
+

src/main.c

@@ -0,0 +1,7 @@
+#include "../sdk/allocator.h"
+#include "../sdk/logger.h"
+#include "../sdk/side_module_api.h"
+
+char *invoke(const char *str, int length) {
+
+}