/* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 2001 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */#include <port_before.h>#include <ctype.h>#include <stdio.h>#include <string.h>#include <isc/misc.h>#include <port_after.h>static const char hex[17] = "0123456789abcdef";intisc_gethexstring(unsigned char *buf, size_t len, int count, FILE *fp,		 int *multiline){	int c, n;	unsigned char x;	char *s;	int result = count;		x = 0; /* silence compiler */	n = 0;	while (count > 0) {		c = fgetc(fp);		if ((c == EOF) ||		    (c == '\n' && !*multiline) ||		    (c == '(' && *multiline) ||		    (c == ')' && !*multiline))			goto formerr;		/* comment */		if (c == ';') {			while ((c = fgetc(fp)) != EOF && c != '\n')				/* empty */			if (c == '\n' && *multiline)				continue;			goto formerr;		}		/* white space */		if (c == ' ' || c == '\t' || c == '\n' || c == '\r')			continue;		/* multiline */		if ('(' == c || c == ')') {			*multiline = (c == '(' /*)*/);			continue;		}		if ((s = strchr(hex, tolower(c))) == NULL)			goto formerr;		x = (x<<4) | (s - hex);		if (++n == 2) {			if (len > 0U) {				*buf++ = x;				len--;			} else				result = -1;			count--;			n = 0;		}	}	return (result); formerr:	if (c == '\n')		ungetc(c, fp);	return (-1);}voidisc_puthexstring(FILE *fp, const unsigned char *buf, size_t buflen,		 size_t len1, size_t len2, const char *sep){	size_t i = 0;	if (len1 < 4U)		len1 = 4;	if (len2 < 4U)		len2 = 4;	while (buflen > 0U) {		fputc(hex[(buf[0]>>4)&0xf], fp);		fputc(hex[buf[0]&0xf], fp);		i += 2;		buflen--;		buf++;		if (i >= len1 && sep != NULL) {			fputs(sep, fp);			i = 0;			len1 = len2;		}	}}voidisc_tohex(const unsigned char *buf, size_t buflen, char *t) {	while (buflen > 0U) {		*t++ = hex[(buf[0]>>4)&0xf];		*t++ = hex[buf[0]&0xf];		buf++;		buflen--;	}	*t = '\0';}