1068N/A

911N/A#include <ctype.h>

486N/A#include <stdio.h> // For stdout, stderr

486N/A

486N/A#include "ClientCommon.h"

486N/A

486N/Aconst char *GetNextLabel(const char *cstr, char label[64])

493N/A{

486N/A char *ptr = label;

970N/A while (*cstr && *cstr != '.') // While we have characters in the label...

970N/A {

970N/A char c = *cstr++;

486N/A if (c == '\\' && *cstr) // If we have a backslash, and it's not the last character of the string

{

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);

}