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#include "dnsresolv.h"
#include "stralloc.h"
/**
@file dns_dtda.c
@author djb
@source ucspi-tcp
@brief domain to dot append
*/
int dns_domain_todot_cat(stralloc *out, const char *d)
{
char ch;
char ch2;
unsigned char ch3;
char buf[4];
if (!*d) return stralloc_append(out, ".");
for (;;) {
ch = *d++;
while (ch--) {
ch2 = *d++;
if ((ch2 >= 'A') && (ch2 <= 'Z')) ch2 += 32; // FQDN -> lowercase
if (((ch2 >= 'a') && (ch2 <= 'z')) || ((ch2 >= '0') && (ch2 <= '9')) || (ch2 == '-')
|| (ch2 == '_'))
{
if (!stralloc_append(out, &ch2)) return DNS_MEM;
} else { // decimal -> octal
ch3 = ch2;
buf[3] = '0' + (ch3 & 7);
ch3 >>= 3;
buf[2] = '0' + (ch3 & 7);
ch3 >>= 3;
buf[1] = '0' + (ch3 & 7);
buf[0] = '\\';
if (!stralloc_catb(out, buf, 4)) return DNS_MEM;
}
}
if (!*d) return 1;
if (!stralloc_append(out, ".")) return DNS_MEM;
}
}
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