[lib][stdio] fix the build after -fbuiltin and io changes

app/tests/rules.mk

@@ -18,6 +18,6 @@ MODULE_SRCS += \
 
 MODULE_ARM_OVERRIDE_SRCS := \
 
-MODULE_COMPILEFLAGS += -Wno-format
+MODULE_COMPILEFLAGS += -Wno-format -fno-builtin
 
 include make/module.mk

lib/console/console.c

@@ -267,9 +267,7 @@ static int read_debug_line(const char **outbuffer, void *cookie)
                 case 0x8:
                     if (pos > 0) {
                         pos--;
-                        fputc('\b', stdout);
-                        putchar(' ');
-                        fputc('\b', stdout); // move to the left one
+                        fputs("\b \b", stdout); // wipe out a character
                     }
                     break;
 
@@ -301,9 +299,7 @@ static int read_debug_line(const char **outbuffer, void *cookie)
                     if (pos > 0) {
                         pos--;
                         if (echo) {
-                            fputc('\b', stdout); // move to the left one
-                            putchar(' ');
-                            fputc('\b', stdout); // move to the left one
+                            fputs("\b \b", stdout); // wipe out a character
                         }
                     }
                     break;
@@ -314,9 +310,7 @@ static int read_debug_line(const char **outbuffer, void *cookie)
                     while (pos > 0) {
                         pos--;
                         if (echo) {
-                            fputc('\b', stdout); // move to the left one
-                            putchar(' ');
-                            fputc('\b', stdout); // move to the left one
+                            fputs("\b \b", stdout); // wipe out a character
                         }
                     }
 
@@ -825,9 +819,7 @@ static void read_line_panic(char* buffer, const size_t len, FILE* panic_fd)
             case 0x8:
                 if (pos > 0) {
                     pos--;
-                    fputc('\b', stdout);
-                    fputc(' ', panic_fd);
-                    fputc('\b', stdout); // move to the left one
+                    fputs("\b \b", panic_fd); // wipe out a character
                 }
                 break;
             default:

lib/ffs/os.c

@@ -231,6 +231,7 @@ int fclose(FILE *stream)
 	return 0;
 }
 
+#if 0
 size_t fread(void *ptr, size_t size, size_t count, FILE *stream)
 {
 	FRESULT res;
@@ -256,6 +257,7 @@ size_t fwrite(const void *ptr, size_t size, size_t count, FILE *stream)
 	
 	return bwrite;
 }
+#endif
 
 int fflush(FILE *stream)
 {

lib/gfxconsole/gfxconsole.c

@@ -32,6 +32,7 @@
 
 #include <debug.h>
 #include <assert.h>
+#include <sys/io.h>
 #include <lk/init.h>
 #include <lib/gfx.h>
 #include <lib/gfxconsole.h>

lib/libc/stdio.c

@@ -53,6 +53,22 @@ int fputs(const char *s, FILE *fp)
     return fp->write(fp->ctx, s, len);
 }
 
+size_t fwrite(const void *ptr, size_t size, size_t count, FILE *fp)
+{
+    size_t bytes_written;
+
+    if (size == 0 || count == 0)
+        return 0;
+
+    // fast path for size == 1
+    if (likely(size == 1)) {
+        return fp->write(fp->ctx, ptr, count);
+    }
+
+    bytes_written = fp->write(fp->ctx, ptr, size * count);
+    return bytes_written / size;
+}
+
 int getc(FILE *fp)
 {
     return fp->fgetc(fp->ctx);

platform/lpc43xx/udc-common.c

@@ -23,7 +23,7 @@
  */
 
 #include <malloc.h>
-#include <printf.h>
+#include <stdio.h>
 #include <string.h>
 #include <dev/udc.h>