Escape non-printable characters correctly

This is the equivalent patch to xserver commit
eaf1f72ed8994b708d94ec2de7b1a99f5c4a39b8:

 XkbStringText escapes non-printable characters using octal numbers. Such escape
 sequence would be at most 5 characters long ("\0123"), so it reserves 5 bytes
 in the buffer. Due to char->unsigned int conversion, it would print much longer
 string for negative numbers.

Fixes https://gitlab.freedesktop.org/xorg/lib/libxkbfile/-/issues/8

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/xkbtext.c b/src/xkbtext.c
index 6741d1a..91c3c33 100644
--- a/src/xkbtext.c
+++ b/src/xkbtext.c
@@ -733,7 +733,7 @@ XkbStringText(char *str, unsigned format)
             }
             else {
                 *out++ = '0';
-                sprintf(out, "%o", *in);
+                sprintf(out, "%o", (unsigned char)*in);
                 while (*out != '\0')
                     out++;
             }