+
+/*
+ * Basic I/O functions to support newlib tinystdio package
+ */
+
+static int
+ao_putc(char c, FILE *ignore)
+{
+ (void) ignore;
+ return ao_putchar(c);
+}
+
+static int
+ao_getc(FILE *ignore)
+{
+ (void) ignore;
+ return ao_getchar();
+}
+
+static int
+ao_flushc(FILE *ignore)
+{
+ (void) ignore;
+ flush();
+ return 0;
+}
+
+static FILE __stdio = FDEV_SETUP_STREAM(ao_putc, ao_getc, ao_flushc, _FDEV_SETUP_RW);
+
+#ifdef PICOLIBC_STDIO_GLOBALS
+
+#ifdef __strong_reference
+#define STDIO_ALIAS(x) __strong_reference(stdin, x);
+#else
+#define STDIO_ALIAS(x) FILE *const x = &__stdio;
+#endif
+
+FILE *const stdin = &__stdio;
+STDIO_ALIAS(stdout);
+STDIO_ALIAS(stderr);
+
+#else
+
+FILE *const __iob[3] = { &__stdio, &__stdio, &__stdio };
+
+#endif