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new function psl_registered_domain()

This commit is contained in:
Tim Ruehsen 2014-03-26 17:14:25 +01:00
parent 8791ad0b9a
commit a18777c2e3
2 changed files with 29 additions and 0 deletions
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3
include/libpsl.h
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@ -64,6 +64,9 @@ const psl_ctx_t *
psl_builtin(void); psl_builtin(void);
int int
psl_is_public(const psl_ctx_t *psl, const char *domain); psl_is_public(const psl_ctx_t *psl, const char *domain);
// return pointer to longest registered domain within 'domain' or NULL if none found
const char *
psl_registered_domain(const psl_ctx_t *psl, const char *domain);
// does not include exceptions // does not include exceptions
int int
psl_suffix_count(const psl_ctx_t *psl); psl_suffix_count(const psl_ctx_t *psl);

26
src/psl.c
View File

@ -299,6 +299,32 @@ int psl_is_public(const psl_ctx_t *psl, const char *domain)
return 1; return 1;
} }
// return NULL, if string domain does not contain a registered domain
// else return a pointer to the longest registered domain within 'domain'
const char *psl_registered_domain(const psl_ctx_t *psl, const char *domain)
{
const char *p, *ret_domain;
// We check from right to left, e.g. in www.xxx.org we check org, xxx.org, www.xxx.org in this order
// for being a registered domain.
if (!(p = strrchr(domain, '.')))
return psl_is_public(psl, domain) ? NULL : domain;
for (ret_domain = NULL; ;) {
if (psl_is_public(psl, p))
return ret_domain;
else if (p == domain)
return domain;
ret_domain = p + 1;
// go left to next dot
while (p > domain && *--p != '.')
;
}
}
psl_ctx_t *psl_load_file(const char *fname) psl_ctx_t *psl_load_file(const char *fname)
{ {
FILE *fp; FILE *fp;