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#include <pthread.h>
#include <netdb.h>
#include <string.h>
static pthread_mutex_t getnetby_mutex = PTHREAD_MUTEX_INITIALIZER;
static int
convert (struct netent *ret, struct netent *result,
char *buf, int buflen)
{
int len, i;
if (!buf) return -1;
*result = *ret;
result->n_name = (char *) buf;
/* This is the size. */
len = strlen (ret->n_name) + 1;
if (len > buflen) return -1;
buflen -= len;
buf += len;
strcpy (result->n_name, ret->n_name);
/* How many aliases and how big the buffer should be? There
is always a NULL pointer. */
for (len = sizeof (char *), i = 0; ret->n_aliases [i]; i++)
{
/* It should be size of (char *) and the length of string
plus 1. */
len += strlen (ret->n_aliases [i]) + 1 + sizeof (char *);
}
if (len > buflen) return -1;
/* This is an array of char * for n_aliases. */
result->n_aliases = (char **) buf;
buf += (i + 1) * sizeof (char *);
/* We copy the aliases now. */
for (i = 0; ret->n_aliases [i]; i++)
{
result->n_aliases [i] = (char *) buf;
strcpy (result->n_aliases [i], ret->n_aliases [i]);
buf += strlen (ret->n_aliases [i]) + 1;
}
/* This is the last one */
result->n_aliases [i] = NULL;
return 0;
}
struct netent *
getnetbyaddr_r (long net, int type,
struct netent *result, char *buffer, int buflen)
{
struct netent *ret;
pthread_mutex_lock (&getnetby_mutex);
ret = getnetbyaddr (net, type);
if (!ret ||
convert (ret, result, buffer, buflen) != 0)
{
result = NULL;
}
pthread_mutex_unlock (&getnetby_mutex);
return result;
}
struct netent *
getnetbyname_r (const char *name,
struct netent *result, char *buffer, int buflen)
{
struct netent *ret;
pthread_mutex_lock (&getnetby_mutex);
ret = getnetbyname (name);
if (!ret ||
convert (ret, result, buffer, buflen) != 0)
{
result = NULL;
}
pthread_mutex_unlock (&getnetby_mutex);
return result;
}
struct netent *
getnetent_r (struct netent *result, char *buffer, int buflen)
{
struct netent *ret;
pthread_mutex_lock (&getnetby_mutex);
ret = getnetent ();
if (!ret ||
convert (ret, result, buffer, buflen) != 0)
{
result = NULL;
}
pthread_mutex_unlock (&getnetby_mutex);
return result;
}
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