diff options
Diffstat (limited to 'examples/c/ex_encrypt.c')
| -rw-r--r-- | examples/c/ex_encrypt.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/examples/c/ex_encrypt.c b/examples/c/ex_encrypt.c index a919148aff0..3b3323bc091 100644 --- a/examples/c/ex_encrypt.c +++ b/examples/c/ex_encrypt.c @@ -122,8 +122,8 @@ do_rotate(char *buf, size_t len, int rotn) * Now rotate */ for (i = 0; i < len; i++) - if (isalpha(buf[i])) { - if (islower(buf[i])) + if (isalpha((unsigned char)buf[i])) { + if (islower((unsigned char)buf[i])) buf[i] = ((buf[i] - 'a') + rotn) % 26 + 'a'; else buf[i] = ((buf[i] - 'A') + rotn) % 26 + 'A'; |