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git.saurik.com Git - apple/mdnsresponder.git/blob - Clients/ClientCommon.c
1 /* -*- Mode: C; tab-width: 4 -*-
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42 #include <stdio.h> // For stdout, stderr
44 #include "ClientCommon.h"
46 const char *GetNextLabel(const char *cstr
, char label
[64])
49 while (*cstr
&& *cstr
!= '.') // While we have characters in the label...
52 if (c
== '\\') // If escape character, check next character
54 if (*cstr
== '\0') break; // If this is the end of the string, then break
56 if (isdigit(cstr
[-1]) && isdigit(cstr
[0]) && isdigit(cstr
[1]))
58 int v0
= cstr
[-1] - '0'; // then interpret as three-digit decimal
59 int v1
= cstr
[ 0] - '0';
60 int v2
= cstr
[ 1] - '0';
61 int val
= v0
* 100 + v1
* 10 + v2
;
62 // If valid three-digit decimal value, use it
63 // Note that although ascii nuls are possible in DNS labels
64 // we're building a C string here so we have no way to represent that
65 if (val
== 0) val
= '-';
66 if (val
<= 255) { c
= (char)val
; cstr
+= 2; }
70 if (ptr
>= label
+64) { label
[63] = 0; return(NULL
); } // Illegal label more than 63 bytes
72 *ptr
= 0; // Null-terminate label text
73 if (ptr
== label
) return(NULL
); // Illegal empty label
74 if (*cstr
) cstr
++; // Skip over the trailing dot (if present)