Add fprintf

Author: lupyuen

README.md

@@ -440,7 +440,7 @@ Then we...
 
 - [Add sscanf](https://github.com/lupyuen/tcc-riscv32-wasm/commit/abf18acd6053b852363afa9adefcc81501f334ed)
 
-- [Add vsnprintf](https://github.com/lupyuen/tcc-riscv32-wasm/commit/5bc7d6b4c002a3ee16161d819d1c3300b55a91d3)
+- [Add vsnprintf and fflush](https://github.com/lupyuen/tcc-riscv32-wasm/commit/c76b671e771d6ba4bb62230e1546aeb3e8637850)
 
 When we run it: open() tries to open `hello.c` and create a Semaphore yay!
 

docs/tcc-wasm.wasm

@@ -69,7 +69,7 @@ export fn sem_wait(sem: *sem_t) c_int {
 const sem_t = opaque {};
 
 ///////////////////////////////////////////////////////////////////////////////
-//  sscanf, vsnprintf
+//  Varargs Functions
 
 export fn sscanf(str: [*:0]const u8, format: [*:0]const u8, ...) c_int {
     debug("TODO: sscanf: str={s}, format={s}", .{ str, format });
@@ -92,7 +92,13 @@ export fn vsnprintf(str: [*:0]u8, size: size_t, format: [*:0]const u8, ...) c_in
     return @intCast(strlen(format));
 }
 
+export fn fprintf(stream: *FILE, format: [*:0]const u8, ...) c_int {
+    debug("fprintf: stream={*}, format={s}", .{ stream, format });
+    return @intCast(strlen(format));
+}
+
 const size_t = c_ulong;
+const FILE = opaque {};
 
 ///////////////////////////////////////////////////////////////////////////////
 //  Memory Allocator for malloc
@@ -320,9 +326,6 @@ pub export fn fdopen(_: c_int) c_int {
 pub export fn fopen(_: c_int) c_int {
     @panic("TODO: fopen");
 }
-pub export fn fprintf(_: c_int) c_int {
-    @panic("TODO: fprintf");
-}
 pub export fn fputc(_: c_int) c_int {
     @panic("TODO: fputc");
 }