cast and fix usage of log10(), ceil to prevent buffer overflow

1 files changed, 1 insertions, 1 deletions

diff --git a/src/buf.c b/src/buf.c
index c03b85f..185cbd3 100644
--- a/src/buf.c
+++ b/src/buf.c
@@ -100,7 +100,7 @@ struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
 
     tsz = strlen("#line \"\"\n")                +   /* constant parts */
                2 * strlen (filename)            +   /* filename with possibly all backslashes escaped */
-               (int) (1 + log10 (abs (lineno))) +   /* line number */
+               (size_t) (1 + ceil (log10 (abs (lineno)))) +   /* line number */
                1;                                   /* NUL */
     t = malloc(tsz);
     if (!t)