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/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "dns-util.h"
/**
return first position from b->a of c or a if not found
*/
static inline
const char *strchr_ba(const char *a, const char *b, char c)
{
for(;b>a && *b != c; b--);
return b;
}
int dns_ncompare(const char *a, const char *b, size_t n)
{
if (a == NULL && b == NULL) return 0;
if (a == NULL && b != NULL) return 1;
if (a != NULL && b == NULL) return -1;
for(size_t i = 0; i < n &&
*a != '\0' &&
*b != '\0' &&
dns_tolower(*a) == dns_tolower(*b);
i++, a++, b++);
return dns_tolower(*a) - dns_tolower(*b);
}
int dns_compare(const char *a, const char *b)
{
return dns_ncompare(a, b, SIZE_MAX);
}
int dns_compare_labels(const char *a, const char *b)
{
if (a == NULL && b == NULL) return 0;
if (a == NULL && b != NULL) return 1;
if (a != NULL && b == NULL) return -1;
const char *ptr_a = a + strlen(a);
const char *ptr_b = b + strlen(b);
const char *label_a = ptr_a, *label_b = ptr_b;
int comp = 0;
while(comp == 0 && ptr_a > a && ptr_b > b) {
/* look for start of label, including dot */
label_a = strchr_ba(a, ptr_a, '.');
label_b = strchr_ba(b, ptr_b, '.');
if (ptr_a - label_a != ptr_b - label_b)
/* compare labels up to minimum length
but include \0 to make sure that we
don't consider alpha and alphabet
equal */
return dns_ncompare(label_a, label_b,
I_MIN(ptr_a - label_a,
ptr_b - label_b)+1);
comp = dns_ncompare(label_a, label_b, ptr_a -label_a);
ptr_a = label_a - 1;
ptr_b = label_b - 1;
}
return dns_tolower(*label_a) - dns_tolower(*label_b);
}
int dns_match_wildcard(const char *name, const char *mask)
{
i_assert(name != NULL && mask != NULL);
for(;*name != '\0' && *mask != '\0'; name++, mask++) {
switch(*mask) {
case '*':
name = strchr(name, '.');
if (name == NULL || mask[1] != '.') return -1;
mask++;
break;
case '?':
break;
default:
if (dns_tolower(*name) != dns_tolower(*mask)) return -1;
}
}
if (*mask == '*') mask++;
return dns_tolower(*name) == dns_tolower(*mask) ? 0 : -1;
}
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