+/*
+ * Print a null-terminated string, filtering out non-printable characters.
+ * DON'T USE IT with a pointer on the packet buffer because there is no
+ * truncation check. For this use, see the nd_printX() functions below.
+ */
+void
+fn_print_str(netdissect_options *ndo, const u_char *s)
+{
+ while (*s != '\0') {
+ fn_print_char(ndo, *s);
+ s++;
+ }
+}
+
+/*
+ * Print out a null-terminated filename (or other ASCII string) from
+ * a fixed-length field in the packet buffer, or from what remains of
+ * the packet.
+ *
+ * n is the length of the fixed-length field, or the number of bytes
+ * remaining in the packet based on its on-the-network length.
+ *
+ * If ep is non-null, it should point just past the last captured byte
+ * of the packet, e.g. ndo->ndo_snapend. If ep is NULL, we assume no
+ * truncation check, other than the checks of the field length/remaining
+ * packet data length, is needed.
+ *
+ * Return the number of bytes of string processed, including the
+ * terminating null, if not truncated; as the terminating null is
+ * included in the count, and as there must be a terminating null,
+ * this will always be non-zero. Return 0 if truncated.
+ */
+u_int
+nd_printztn(netdissect_options *ndo,
+ const u_char *s, u_int n, const u_char *ep)
+{
+ u_int bytes;
+ u_char c;
+
+ bytes = 0;
+ for (;;) {
+ if (n == 0 || (ep != NULL && s >= ep)) {
+ /*
+ * Truncated. This includes "no null before we
+ * got to the end of the fixed-length buffer or
+ * the end of the packet".
+ *
+ * XXX - BOOTP says "null-terminated", which
+ * means the maximum length of the string, in
+ * bytes, is 1 less than the size of the buffer,
+ * as there must always be a terminating null.
+ */
+ bytes = 0;
projects / tcpdump / blobdiff