usr/src/common/net/dhcp/octet.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1996-2002 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /* LINTLIBRARY */
  28
  29 #if !defined(_BOOT) && !defined(_KERNEL)
  30 #include <stdio.h>
  31 #include <ctype.h>
  32 #include <stdlib.h>
  33 #endif  /* _BOOT && _KERNEL */
  34 #include <sys/types.h>
  35 #include <sys/null.h>
  36 #include <sys/errno.h>
  37
  38 #if     defined(_BOOT) || defined(_KERNEL)
  39 #define isdigit(c)      ((c) >= '0' && c <= '9')
  40 #define isxdigit(c)     (isdigit(c) || (((c) >= 'a') && ((c) <= 'f')) || \
  41                         (((c) >= 'A') && ((c) <= 'F')))
  42 #endif  /* _BOOT || _KERNEL */
  43
  44 /*
  45  * Converts an octet string into an ASCII string. The string returned is
  46  * NULL-terminated, and the length recorded in blen does *not* include the
  47  * null terminator (in other words, octet_to_hexascii() returns the length a'la
  48  * strlen()).
  49  *
  50  * Returns 0 for Success, errno otherwise.
  51  */
  52 int
  53 octet_to_hexascii(const void *nump, uint_t nlen, char *bufp, uint_t *blen)
  54 {
  55         int             i;
  56         char            *bp;
  57         const uchar_t   *np;
  58         static char     ascii_conv[] = "0123456789ABCDEF";
  59
  60         if (nump == NULL || bufp == NULL || blen == NULL)
  61                 return (EINVAL);
  62
  63         if ((nlen * 2) >= *blen) {
  64                 *blen = 0;
  65                 return (E2BIG);
  66         }
  67         for (i = 0, bp = bufp, np = (const uchar_t *)nump; i < nlen; i++) {
  68                 *bp++ = ascii_conv[(np[i] >> 4) & 0x0f];
  69                 *bp++ = ascii_conv[np[i] & 0x0f];
  70         }
  71         *bp = '\0';
  72         *blen = i * 2;
  73         return (0);
  74 }
  75
  76 /*
  77  * Converts an ASCII string into an octet string.
  78  *
  79  * Returns 0 for success, errno otherwise.
  80  */
  81 int
  82 hexascii_to_octet(const char *asp, uint_t alen, void *bufp, uint_t *blen)
  83 {
  84         int             i, j, k;
  85         const char      *tp;
  86         uchar_t         *u_tp;
  87
  88         if (asp == NULL || bufp == NULL || blen == NULL)
  89                 return (EINVAL);
  90
  91         if (alen > (*blen * 2))
  92                 return (E2BIG);
  93
  94         k = ((alen % 2) == 0) ? alen / 2 : (alen / 2) + 1;
  95         for (tp = asp, u_tp = (uchar_t *)bufp, i = 0; i < k; i++, u_tp++) {
  96                 /* one nibble at a time */
  97                 for (*u_tp = 0, j = 0; j < 2; j++, tp++) {
  98                         if (isdigit(*tp))
  99                                 *u_tp |= *tp - '0';
 100                         else if (isxdigit(*tp))
 101                                 *u_tp |= (*tp & ~0x20) + 10 - 'A';
 102                         else
 103                                 return (EINVAL);
 104                         if ((j % 2) == 0)
 105                                 *u_tp <<= 4;
 106                 }
 107         }
 108         *blen = k;
 109         return (0);
 110 }