1*5ffb0c9bSToomas Soome /* -*- Mode: C; tab-width: 4 -*-
2*5ffb0c9bSToomas Soome *
3*5ffb0c9bSToomas Soome * Copyright (c) 2008 Apple Inc. All rights reserved.
4*5ffb0c9bSToomas Soome *
5*5ffb0c9bSToomas Soome * Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
6*5ffb0c9bSToomas Soome * ("Apple") in consideration of your agreement to the following terms, and your
7*5ffb0c9bSToomas Soome * use, installation, modification or redistribution of this Apple software
8*5ffb0c9bSToomas Soome * constitutes acceptance of these terms. If you do not agree with these terms,
9*5ffb0c9bSToomas Soome * please do not use, install, modify or redistribute this Apple software.
10*5ffb0c9bSToomas Soome *
11*5ffb0c9bSToomas Soome * In consideration of your agreement to abide by the following terms, and subject
12*5ffb0c9bSToomas Soome * to these terms, Apple grants you a personal, non-exclusive license, under Apple's
13*5ffb0c9bSToomas Soome * copyrights in this original Apple software (the "Apple Software"), to use,
14*5ffb0c9bSToomas Soome * reproduce, modify and redistribute the Apple Software, with or without
15*5ffb0c9bSToomas Soome * modifications, in source and/or binary forms; provided that if you redistribute
16*5ffb0c9bSToomas Soome * the Apple Software in its entirety and without modifications, you must retain
17*5ffb0c9bSToomas Soome * this notice and the following text and disclaimers in all such redistributions of
18*5ffb0c9bSToomas Soome * the Apple Software. Neither the name, trademarks, service marks or logos of
19*5ffb0c9bSToomas Soome * Apple Computer, Inc. may be used to endorse or promote products derived from the
20*5ffb0c9bSToomas Soome * Apple Software without specific prior written permission from Apple. Except as
21*5ffb0c9bSToomas Soome * expressly stated in this notice, no other rights or licenses, express or implied,
22*5ffb0c9bSToomas Soome * are granted by Apple herein, including but not limited to any patent rights that
23*5ffb0c9bSToomas Soome * may be infringed by your derivative works or by other works in which the Apple
24*5ffb0c9bSToomas Soome * Software may be incorporated.
25*5ffb0c9bSToomas Soome *
26*5ffb0c9bSToomas Soome * The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
27*5ffb0c9bSToomas Soome * WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
28*5ffb0c9bSToomas Soome * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29*5ffb0c9bSToomas Soome * PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
30*5ffb0c9bSToomas Soome * COMBINATION WITH YOUR PRODUCTS.
31*5ffb0c9bSToomas Soome *
32*5ffb0c9bSToomas Soome * IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
33*5ffb0c9bSToomas Soome * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
34*5ffb0c9bSToomas Soome * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35*5ffb0c9bSToomas Soome * ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
36*5ffb0c9bSToomas Soome * OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
37*5ffb0c9bSToomas Soome * (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
38*5ffb0c9bSToomas Soome * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39*5ffb0c9bSToomas Soome */
40*5ffb0c9bSToomas Soome
41*5ffb0c9bSToomas Soome #include <ctype.h>
42*5ffb0c9bSToomas Soome #include <stdio.h> // For stdout, stderr
43*5ffb0c9bSToomas Soome
44*5ffb0c9bSToomas Soome #include "ClientCommon.h"
45*5ffb0c9bSToomas Soome
GetNextLabel(const char * cstr,char label[64])46*5ffb0c9bSToomas Soome const char *GetNextLabel(const char *cstr, char label[64])
47*5ffb0c9bSToomas Soome {
48*5ffb0c9bSToomas Soome char *ptr = label;
49*5ffb0c9bSToomas Soome while (*cstr && *cstr != '.') // While we have characters in the label...
50*5ffb0c9bSToomas Soome {
51*5ffb0c9bSToomas Soome char c = *cstr++;
52*5ffb0c9bSToomas Soome if (c == '\\' && *cstr) // If we have a backslash, and it's not the last character of the string
53*5ffb0c9bSToomas Soome {
54*5ffb0c9bSToomas Soome c = *cstr++;
55*5ffb0c9bSToomas Soome if (isdigit(cstr[-1]) && isdigit(cstr[0]) && isdigit(cstr[1]))
56*5ffb0c9bSToomas Soome {
57*5ffb0c9bSToomas Soome int v0 = cstr[-1] - '0'; // then interpret as three-digit decimal
58*5ffb0c9bSToomas Soome int v1 = cstr[ 0] - '0';
59*5ffb0c9bSToomas Soome int v2 = cstr[ 1] - '0';
60*5ffb0c9bSToomas Soome int val = v0 * 100 + v1 * 10 + v2;
61*5ffb0c9bSToomas Soome // If valid three-digit decimal value, use it
62*5ffb0c9bSToomas Soome // Note that although ascii nuls are possible in DNS labels
63*5ffb0c9bSToomas Soome // we're building a C string here so we have no way to represent that
64*5ffb0c9bSToomas Soome if (val == 0) val = '-';
65*5ffb0c9bSToomas Soome if (val <= 255) { c = (char)val; cstr += 2; }
66*5ffb0c9bSToomas Soome }
67*5ffb0c9bSToomas Soome }
68*5ffb0c9bSToomas Soome *ptr++ = c;
69*5ffb0c9bSToomas Soome if (ptr >= label+64) { label[63] = 0; return(NULL); } // Illegal label more than 63 bytes
70*5ffb0c9bSToomas Soome }
71*5ffb0c9bSToomas Soome *ptr = 0; // Null-terminate label text
72*5ffb0c9bSToomas Soome if (ptr == label) return(NULL); // Illegal empty label
73*5ffb0c9bSToomas Soome if (*cstr) cstr++; // Skip over the trailing dot (if present)
74*5ffb0c9bSToomas Soome return(cstr);
75*5ffb0c9bSToomas Soome }
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