all: Unify header guard usage.

The code conventions suggest using header guards, but do not define how
those should look like and instead point to existing files. However, not
all existing files follow the same scheme, sometimes omitting header guards
altogether, sometimes using non-standard names, making it easy to
accidentally pick a "wrong" example.

This commit ensures that all header files of the MicroPython project (that
were not simply copied from somewhere else) follow the same pattern, that
was already present in the majority of files, especially in the py folder.

The rules are as follows.

Naming convention:
* start with the words MICROPY_INCLUDED
* contain the full path to the file
* replace special characters with _

In addition, there are no empty lines before #ifndef, between #ifndef and
one empty line before #endif. #endif is followed by a comment containing
the name of the guard macro.

py/grammar.h cannot use header guards by design, since it has to be
included multiple times in a single C file. Several other files also do not
need header guards as they are only used internally and guaranteed to be
included only once:
* MICROPY_MPHALPORT_H
* mpconfigboard.h
* mpconfigport.h
* mpthreadport.h
* pin_defs_*.h
* qstrdefs*.h

1 files changed, 3 insertions, 3 deletions

diff --git a/esp8266/modmachine.h b/esp8266/modmachine.h
index 414aaa85b0..eae351f68d 100644
--- a/esp8266/modmachine.h
+++ b/esp8266/modmachine.h
@@ -1,5 +1,5 @@
-#ifndef __MICROPY_INCLUDED_ESP8266_MODPYB_H__
-#define __MICROPY_INCLUDED_ESP8266_MODPYB_H__
+#ifndef MICROPY_INCLUDED_ESP8266_MODMACHINE_H
+#define MICROPY_INCLUDED_ESP8266_MODMACHINE_H
 
 #include "py/obj.h"
 
@@ -38,4 +38,4 @@ void pyb_rtc_set_us_since_2000(uint64_t nowus);
 uint64_t pyb_rtc_get_us_since_2000();
 void rtc_prepare_deepsleep(uint64_t sleep_us);
 
-#endif // __MICROPY_INCLUDED_ESP8266_MODPYB_H__
+#endif // MICROPY_INCLUDED_ESP8266_MODMACHINE_H