esp8266/esp_mphal: Implement libc's errno.

pfalcon · pfalcon · commit 64ad838fde7a · 2016-07-31T02:30:05.000+03:00
Using __errno() function, and redirect it to use mp_stream_errno from
stream module. This is pre-requisite for integrating with 3rd-party libs,
like BerkeleyDB.
diff --git a/esp8266/esp_mphal.c b/esp8266/esp_mphal.c
@@ -259,3 +259,8 @@ int ets_esf_free_bufs(int idx) {
     }
     return cnt;
 }
+
+extern int mp_stream_errno;
+int *__errno() {
+    return &mp_stream_errno;
+}

Original file line number	Diff line number	Diff line change
`@@ -259,3 +259,8 @@ int ets_esf_free_bufs(int idx) {`
`259`	`259`	`}`
`260`	`260`	`return cnt;`
`261`	`261`	`}`
	`262`	`+`
	`263`	`+extern int mp_stream_errno;`
	`264`	`+int *__errno() {`
	`265`	`+ return &mp_stream_errno;`
	`266`	`+}`