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76 lines
3.6 KiB
76 lines
3.6 KiB
4 months ago
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/* -*- Mode: C; tab-width: 4 -*-
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*
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* Copyright (c) 2008 Apple Inc. All rights reserved.
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*
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* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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* ("Apple") in consideration of your agreement to the following terms, and your
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* use, installation, modification or redistribution of this Apple software
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* constitutes acceptance of these terms. If you do not agree with these terms,
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* please do not use, install, modify or redistribute this Apple software.
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*
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* In consideration of your agreement to abide by the following terms, and subject
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* to these terms, Apple grants you a personal, non-exclusive license, under Apple's
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* copyrights in this original Apple software (the "Apple Software"), to use,
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* reproduce, modify and redistribute the Apple Software, with or without
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* modifications, in source and/or binary forms; provided that if you redistribute
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* the Apple Software in its entirety and without modifications, you must retain
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* this notice and the following text and disclaimers in all such redistributions of
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* the Apple Software. Neither the name, trademarks, service marks or logos of
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* Apple Computer, Inc. may be used to endorse or promote products derived from the
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* Apple Software without specific prior written permission from Apple. Except as
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* expressly stated in this notice, no other rights or licenses, express or implied,
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* are granted by Apple herein, including but not limited to any patent rights that
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* may be infringed by your derivative works or by other works in which the Apple
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* Software may be incorporated.
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*
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* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
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* WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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* WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
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* COMBINATION WITH YOUR PRODUCTS.
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*
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* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
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* OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
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* (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <ctype.h>
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#include <stdio.h> // For stdout, stderr
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#include "ClientCommon.h"
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const char *GetNextLabel(const char *cstr, char label[64])
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{
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char *ptr = label;
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while (*cstr && *cstr != '.') // While we have characters in the label...
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{
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char c = *cstr++;
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if (c == '\\' && *cstr) // If we have a backslash, and it's not the last character of the string
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{
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c = *cstr++;
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if (isdigit(cstr[-1]) && isdigit(cstr[0]) && isdigit(cstr[1]))
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{
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int v0 = cstr[-1] - '0'; // then interpret as three-digit decimal
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int v1 = cstr[ 0] - '0';
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int v2 = cstr[ 1] - '0';
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int val = v0 * 100 + v1 * 10 + v2;
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// If valid three-digit decimal value, use it
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// Note that although ascii nuls are possible in DNS labels
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// we're building a C string here so we have no way to represent that
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if (val == 0) val = '-';
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if (val <= 255) { c = (char)val; cstr += 2; }
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}
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}
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*ptr++ = c;
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if (ptr >= label+64) { label[63] = 0; return(NULL); } // Illegal label more than 63 bytes
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}
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*ptr = 0; // Null-terminate label text
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if (ptr == label) return(NULL); // Illegal empty label
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if (*cstr) cstr++; // Skip over the trailing dot (if present)
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return(cstr);
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}
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