/* -*- Mode: C; tab-width: 4 -*-
*
* Copyright (c) 2008-2011 Apple Inc. All rights reserved.
*
* Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.
* ("Apple") in consideration of your agreement to the following terms, and your
* use, installation, modification or redistribution of this Apple software
* constitutes acceptance of these terms. If you do not agree with these terms,
* please do not use, install, modify or redistribute this Apple software.
*
* In consideration of your agreement to abide by the following terms, and subject
* to these terms, Apple grants you a personal, non-exclusive license, under Apple's
* copyrights in this original Apple software (the "Apple Software"), to use,
* reproduce, modify and redistribute the Apple Software, with or without
* modifications, in source and/or binary forms; provided that if you redistribute
* the Apple Software in its entirety and without modifications, you must retain
* this notice and the following text and disclaimers in all such redistributions of
* the Apple Software. Neither the name, trademarks, service marks or logos of
* Apple Inc. may be used to endorse or promote products derived from the
* Apple Software without specific prior written permission from Apple. Except as
* expressly stated in this notice, no other rights or licenses, express or implied,
* are granted by Apple herein, including but not limited to any patent rights that
* may be infringed by your derivative works or by other works in which the Apple
* Software may be incorporated.
*
* The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
* WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
* WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
* COMBINATION WITH YOUR PRODUCTS.
*
* IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
* OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <ctype.h>
#include <stdio.h> // For stdout, stderr
#include "ClientCommon.h"
const char *GetNextLabel(const char *cstr, char label[64])
{
char *ptr = label;
while (*cstr && *cstr != '.') // While we have characters in the label...
{
char c = *cstr++;
if (c == '\\') // If escape character, check next character
{
if (*cstr == '\0') break; // If this is the end of the string, then break
c = *cstr++;
if (isdigit(cstr[-1]) && isdigit(cstr[0]) && isdigit(cstr[1]))
{
int v0 = cstr[-1] - '0'; // then interpret as three-digit decimal
int v1 = cstr[ 0] - '0';
int v2 = cstr[ 1] - '0';
int val = v0 * 100 + v1 * 10 + v2;
// If valid three-digit decimal value, use it
// Note that although ascii nuls are possible in DNS labels
// we're building a C string here so we have no way to represent that
if (val == 0) val = '-';
if (val <= 255) { c = (char)val; cstr += 2; }
}
}
*ptr++ = c;
if (ptr >= label+64) { label[63] = 0; return(NULL); } // Illegal label more than 63 bytes
}
*ptr = 0; // Null-terminate label text
if (ptr == label) return(NULL); // Illegal empty label
if (*cstr) cstr++; // Skip over the trailing dot (if present)
return(cstr);
}
