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branch: master
D. J. Bernstein
75 lines (62 sloc) 1.261 kb
#include "error.h"
#include "alloc.h"
#include "case.h"
#include "byte.h"
#include "dns.h"
unsigned int dns_domain_length(const char *dn)
{
const char *x;
unsigned char c;
x = dn;
while (c = *x++)
x += (unsigned int) c;
return x - dn;
}
void dns_domain_free(char **out)
{
if (*out) {
alloc_free(*out);
*out = 0;
}
}
int dns_domain_copy(char **out,const char *in)
{
unsigned int len;
char *x;
len = dns_domain_length(in);
x = alloc(len);
if (!x) return 0;
byte_copy(x,len,in);
if (*out) alloc_free(*out);
*out = x;
return 1;
}
int dns_domain_equal(const char *dn1,const char *dn2)
{
unsigned int len;
len = dns_domain_length(dn1);
if (len != dns_domain_length(dn2)) return 0;
if (case_diffb(dn1,len,dn2)) return 0; /* safe since 63 < 'A' */
return 1;
}
int dns_domain_suffix(const char *big,const char *little)
{
unsigned char c;
for (;;) {
if (dns_domain_equal(big,little)) return 1;
c = *big++;
if (!c) return 0;
big += c;
}
}
unsigned int dns_domain_suffixpos(const char *big,const char *little)
{
const char *orig = big;
unsigned char c;
for (;;) {
if (dns_domain_equal(big,little)) return big - orig;
c = *big++;
if (!c) return 0;
big += c;
}
}
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