--- a/bdfresize.c 2022-08-28 17:36:06.198455929 +0200 +++ b/bdfresize.c 2022-08-28 17:36:09.041752803 +0200 @@ -449,6 +449,7 @@ void error(char *fmt) { char buf[100]; + buf[0] = 0; strcat(buf, "bdfresize: line %d: "); strcat(buf, fmt); fprintf(stderr, buf, line);