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#include "dns.h"
/** Format a DNS domain name as a dotted name. */
unsigned fmt_dns_domain(char* out, const char* domain)
{
unsigned char ch;
unsigned char ch2;
char* orig;
if (!*domain) {
if (out)
out[0] = '.';
return 1;
}
orig = out;
for (;;) {
ch = *domain++;
while (ch--) {
ch2 = *domain++;
if ((ch2 >= 'A') && (ch2 <= 'Z'))
ch2 += 32;
if (((ch2 >= 'a') && (ch2 <= 'z')) || ((ch2 >= '0') && (ch2 <= '9')) || (ch2 == '-') || (ch2 == '_')) {
if (orig)
*out = ch2;
out++;
}
else {
if (orig) {
out[3] = '0' + (ch2 & 7); ch2 >>= 3;
out[2] = '0' + (ch2 & 7); ch2 >>= 3;
out[1] = '0' + (ch2 & 7);
out[0] = '\\';
}
out += 4;
}
}
if (*domain == 0)
break;
if (orig)
*out = '.';
++out;
}
return out - orig;
}
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