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-rw-r--r--inotail.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/inotail.h b/inotail.h
index d1874b5..b215b43 100644
--- a/inotail.h
+++ b/inotail.h
@@ -32,6 +32,8 @@ struct file_struct {
#define IS_TAILABLE(mode) \
(S_ISREG(mode) || IS_PIPELIKE(mode) || S_ISCHR(mode))
+#define is_digit(c) ((c) >= '0' && (c) <= '9')
+
#ifdef DEBUG
# define dprintf(fmt, args...) fprintf(stderr, fmt, ##args)
#else