Replaced some newlib functions to avoid puling in reent struct

Author: dc42

src/libc/errno.c

@@ -0,0 +1,17 @@
+/*
+ * errno.c
+ *
+ *  Created on: 1 Oct 2022
+ *      Author: David
+ *
+ *  This file replaces the one in newlib in order to avoid pulling the reent struct
+ */
+
+static int globalErrno = 0;
+
+int * __errno () noexcept
+{
+	return &globalErrno;
+}
+
+// End

src/libc/nano-mallocr.c

@@ -32,9 +32,13 @@
  * Interface documentation refer to malloc.c.
  */
 
+#if 0	// DC we don't want to pull in stdio
 #include <stdio.h>
+#endif
 #include <string.h>
+#if 0	// DC we don't want to pull in errno because it pulls in the reent struct
 #include <errno.h>
+#endif
 #include <malloc.h>
 
 #if 1	// DC
@@ -57,6 +61,7 @@
 #include <assert.h>
 #else
 #define assert(x) ((void)0)
+#include <stdint.h>
 extern void vAssertCalled(uint32_t line, const char *file) noexcept;
 #endif
 
@@ -116,9 +121,9 @@ extern void ReleaseMallocMutex();
 #else
 #define MALLOC_LOCK
 #define MALLOC_UNLOCK
-#endif
 
 #define RERRNO errno
+#endif
 
 #define nano_malloc		malloc
 #define nano_free		free
@@ -279,7 +284,9 @@ void * nano_malloc(RARG malloc_size_t s)
 
     if (alloc_size >= MAX_ALLOC_SIZE || alloc_size < s)
     {
+#if 0	// DC
         RERRNO = ENOMEM;
+#endif
         return NULL;
     }
 
@@ -328,7 +335,9 @@ void * nano_malloc(RARG malloc_size_t s)
         /* sbrk returns -1 if fail to allocate */
         if (r == (void *)-1)
         {
+#if 0	// DC
             RERRNO = ENOMEM;
+#endif
             MALLOC_UNLOCK;
             return NULL;
         }