2 files changed, 11 insertions, 0 deletions
diff --git a/lib/libc/include/ctype.h b/lib/libc/include/ctype.h
index 0ff9a43..2a827e3 100644
--- a/lib/libc/include/ctype.h
+++ b/lib/libc/include/ctype.h
@@ -36,6 +36,12 @@
 __BEGIN_DECLS
 
 __always_inline static inline int
+__isascii(int c)
+{
+    return c >= 0 && c <= 127;
+}
+
+__always_inline static inline int
 __tolower(int c)
 {
     return c | 0x20;
@@ -92,4 +98,7 @@ __END_DECLS
 /* Is a space? */
 #define isspace(C) __isspace((C))
 
+/* Is ascii? */
+#define isascii(C) __isascii((C))
+
 #endif  /* _CTYPE_H */
diff --git a/lib/libc/src/stdio/fopen.c b/lib/libc/src/stdio/fopen.c
index c15dace..efeb577 100644
--- a/lib/libc/src/stdio/fopen.c
+++ b/lib/libc/src/stdio/fopen.c
@@ -51,6 +51,8 @@ fopen(const char *__restrict path, const char *__restrict mode)
         seal |= (O_WRONLY | O_CREAT);
     } else if (strcmp(mode, "r+") == 0) {
         seal |= O_RDWR;
+    } else if (strcmp(mode, "rb") == 0) {
+        seal |= O_RDONLY;
     } else {
         return NULL;
     }