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-rw-r--r--include/libbb.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 63748c85d..baab74878 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -666,7 +666,6 @@ extern const char bb_default_login_shell[];
#undef isascii
#undef isblank
#undef iscntrl
-#undef isdigit
#undef isgraph
#undef islower
#undef isprint
@@ -675,6 +674,11 @@ extern const char bb_default_login_shell[];
#undef isupper
#undef isxdigit
+/* This one is more efficient - we save ~400 bytes */
+#undef isdigit
+#define isdigit(a) ((unsigned)((a) - '0') <= 9)
+
+
#ifdef DMALLOC
#include <dmalloc.h>
#endif