1 /* 2 * Copyright (c) 2013 The DragonFly Project. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 3. Neither the name of The DragonFly Project nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific, prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 #include <sys/systm.h> 32 33 #define MIN_OUTBLEN 3 34 35 /* 36 * Take an array of u_char of size inlen and stores its hexadecimal representation 37 * into outb which is max size outlen. Use sep as separator. 38 * 39 * Returns the same outb buffer for ease of use when printing. 40 */ 41 char * 42 hexncpy(const u_char *inb, int inlen, char *outb, int outlen, const char *sep) 43 { 44 char hexdigit[] = "0123456789abcdef"; 45 char *addr; 46 47 /* 48 * In the case we pass invalid buffers or the size 49 * of the outb buffer isn't enough to print at least 50 * a single u_char in hex format we assert. 51 */ 52 KKASSERT((outb != NULL && inb != NULL && outlen >= MIN_OUTBLEN)); 53 54 /* Save up our base address */ 55 addr = outb; 56 for (; inlen > 0 && outlen >= MIN_OUTBLEN; --inlen, outlen -= 3) { 57 *outb++ = hexdigit[*inb >> 4]; 58 *outb++ = hexdigit[*inb++ & 0xf]; 59 if (sep) 60 *outb++ = *sep; 61 } 62 *--outb = 0; 63 64 return addr; 65 } 66