(Fcurrent_time_zone): Cast isalnum() argument to

unsigned char.
From Hallvard B Furuseth <h.b.furuseth@usit.uio.no>.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/editfns.c b/src/editfns.c
index bb92f44381e..90be6ba4f21 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -1780,7 +1780,7 @@ the data it can't find.")
           /* On Japanese w32, we can get a Japanese string as time
              zone name.  Don't accept that.  */
           char *p;
-          for (p = s; *p && (isalnum (*p) || *p == ' '); ++p)
+          for (p = s; *p && (isalnum ((unsigned char)*p) || *p == ' '); ++p)
             ;
           if (p == s || *p)
             s = NULL;