fixup! fixup! fixup! fixup! fixup! fixup! [libc] Add putc, fputc, and fprintf to stdio/baremetal

Author: saturn691

libc/src/stdio/baremetal/fprintf.cpp

@@ -30,6 +30,11 @@ LLVM_LIBC_FUNCTION(int, fprintf,
   static constexpr size_t BUFF_SIZE = 1024;
   char buffer[BUFF_SIZE];
 
+  write_utils::StreamWriter write_hook = write_utils::get_write_hook(stream);
+  if (write_hook == nullptr) {
+    return 0;
+  }
+
   printf_core::WriteBuffer<printf_core::WriteMode::FLUSH_TO_STREAM> wb(
       buffer, BUFF_SIZE, write_utils::get_write_hook(stream), nullptr);
   printf_core::Writer<printf_core::WriteMode::FLUSH_TO_STREAM> writer(wb);

libc/src/stdio/baremetal/write_utils.h

@@ -10,7 +10,6 @@
 #include "hdr/types/FILE.h"
 #include "src/__support/CPP/string_view.h"
 #include "src/__support/OSUtil/io.h"
-#include "src/__support/libc_errno.h"
 #include "src/__support/macros/config.h"
 #include "src/stdio/baremetal/write_hooks.h"
 
@@ -23,7 +22,7 @@ LIBC_INLINE void write(::FILE *f, cpp::string_view new_str) {
   } else if (f == stderr) {
     write_to_stderr(new_str);
   } else {
-    libc_errno = 1;
+    // Do nothing
   }
 }
 
@@ -35,8 +34,7 @@ LIBC_INLINE StreamWriter get_write_hook(::FILE *f) {
     return &stderr_write_hook;
   }
 
-  libc_errno = 1;
-  return NULL;
+  return nullptr;
 }
 
 } // namespace write_utils