+/* rnd is additional random input. New one is returned.
+ * Useful if you call crypt_make_salt many times in a row:
+ * rnd = crypt_make_salt(buf1, 4, 0);
+ * rnd = crypt_make_salt(buf2, 4, rnd);
+ * rnd = crypt_make_salt(buf3, 4, rnd);
+ * (otherwise we risk having same salt generated)
+ */
+extern int crypt_make_salt(char *p, int cnt, int rnd);
+
+/* Returns number of lines changed, or -1 on error */
+extern int update_passwd(const char *filename, const char *username,
+ const char *new_pw);
+
+/* NB: typically you want to pass fd 0, not 1. Think 'applet | grep something' */
+int get_terminal_width_height(int fd, int *width, int *height);
+
+int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
+void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...) __attribute__ ((format (printf, 4, 5)));
+#if ENABLE_IOCTL_HEX2STR_ERROR
+int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name);
+void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name);
+#define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp,#request)
+#define xioctl(fd,request,argp) bb_xioctl(fd,request,argp,#request)
+#else
+int bb_ioctl_or_warn(int fd, int request, void *argp);
+void bb_xioctl(int fd, int request, void *argp);
+#define ioctl_or_warn(fd,request,argp) bb_ioctl_or_warn(fd,request,argp)
+#define xioctl(fd,request,argp) bb_xioctl(fd,request,argp)
+#endif