Robert Greenwalt | dd52342 | 2012-03-29 14:43:07 -0700 | [diff] [blame] | 1 | /* -*- Mode: C; tab-width: 4 -*- |
| 2 | * |
| 3 | * Copyright (c) 2008 Apple Inc. All rights reserved. |
| 4 | * |
| 5 | * Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc. |
| 6 | * ("Apple") in consideration of your agreement to the following terms, and your |
| 7 | * use, installation, modification or redistribution of this Apple software |
| 8 | * constitutes acceptance of these terms. If you do not agree with these terms, |
| 9 | * please do not use, install, modify or redistribute this Apple software. |
| 10 | * |
| 11 | * In consideration of your agreement to abide by the following terms, and subject |
| 12 | * to these terms, Apple grants you a personal, non-exclusive license, under Apple's |
| 13 | * copyrights in this original Apple software (the "Apple Software"), to use, |
| 14 | * reproduce, modify and redistribute the Apple Software, with or without |
| 15 | * modifications, in source and/or binary forms; provided that if you redistribute |
| 16 | * the Apple Software in its entirety and without modifications, you must retain |
| 17 | * this notice and the following text and disclaimers in all such redistributions of |
| 18 | * the Apple Software. Neither the name, trademarks, service marks or logos of |
| 19 | * Apple Computer, Inc. may be used to endorse or promote products derived from the |
| 20 | * Apple Software without specific prior written permission from Apple. Except as |
| 21 | * expressly stated in this notice, no other rights or licenses, express or implied, |
| 22 | * are granted by Apple herein, including but not limited to any patent rights that |
| 23 | * may be infringed by your derivative works or by other works in which the Apple |
| 24 | * Software may be incorporated. |
| 25 | * |
| 26 | * The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO |
| 27 | * WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED |
| 28 | * WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 29 | * PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN |
| 30 | * COMBINATION WITH YOUR PRODUCTS. |
| 31 | * |
| 32 | * IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR |
| 33 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| 34 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 35 | * ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION |
| 36 | * OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT |
| 37 | * (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN |
| 38 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 39 | */ |
| 40 | |
| 41 | #include <ctype.h> |
| 42 | #include <stdio.h> // For stdout, stderr |
| 43 | |
| 44 | #include "ClientCommon.h" |
| 45 | |
| 46 | const char *GetNextLabel(const char *cstr, char label[64]) |
| 47 | { |
| 48 | char *ptr = label; |
| 49 | while (*cstr && *cstr != '.') // While we have characters in the label... |
| 50 | { |
| 51 | char c = *cstr++; |
| 52 | if (c == '\\' && *cstr) // If we have a backslash, and it's not the last character of the string |
| 53 | { |
| 54 | c = *cstr++; |
| 55 | if (isdigit(cstr[-1]) && isdigit(cstr[0]) && isdigit(cstr[1])) |
| 56 | { |
| 57 | int v0 = cstr[-1] - '0'; // then interpret as three-digit decimal |
| 58 | int v1 = cstr[ 0] - '0'; |
| 59 | int v2 = cstr[ 1] - '0'; |
| 60 | int val = v0 * 100 + v1 * 10 + v2; |
| 61 | // If valid three-digit decimal value, use it |
| 62 | // Note that although ascii nuls are possible in DNS labels |
| 63 | // we're building a C string here so we have no way to represent that |
| 64 | if (val == 0) val = '-'; |
| 65 | if (val <= 255) { c = (char)val; cstr += 2; } |
| 66 | } |
| 67 | } |
| 68 | *ptr++ = c; |
| 69 | if (ptr >= label+64) { label[63] = 0; return(NULL); } // Illegal label more than 63 bytes |
| 70 | } |
| 71 | *ptr = 0; // Null-terminate label text |
| 72 | if (ptr == label) return(NULL); // Illegal empty label |
| 73 | if (*cstr) cstr++; // Skip over the trailing dot (if present) |
| 74 | return(cstr); |
| 75 | } |