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/* uid_hash.c
*
* routines used by lastcomm and sa to hash data by uids
*/
#include "config.h"
#include <stdio.h>
#include <pwd.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "common.h"
#include "hashtab.h"
#include "uid_hash.h"
/* globals */
struct hashtab *uid_table = NULL;
struct uid_data {
char *name; /* name of the user */
};
/* code */
/* look up UID in the hash table of uids. If it's not there, get it
* from the password database and add it to the hash table.
*/
char *
uid_name (int uid)
{
struct hashtab_elem *he;
if (uid_table == NULL)
uid_table = hashtab_init (sizeof (int));
he = hashtab_find (uid_table, (void *) &uid, sizeof (uid));
if (he == NULL)
{
/* It wasn't there, so add it. */
struct passwd *thispw = getpwuid (uid);
struct uid_data ud;
if (thispw != NULL)
{
ud.name = (char *) xmalloc (sizeof (char)
* (strlen (thispw->pw_name) + 1));
strcpy (ud.name, thispw->pw_name);
}
else
{
int digits, uid_copy = uid;
/* Count the number of digits we'll need. */
for (digits = 2; uid_copy; digits++, uid_copy /= 10)
;
ud.name = (char *) xmalloc (sizeof (char) * digits);
sprintf (ud.name, "%d", uid);
}
he = hashtab_create (uid_table, (void *) &uid, sizeof (uid));
hashtab_set_value (he, &ud, sizeof (ud));
}
{
struct uid_data *ud = hashtab_get_value (he);
return ud->name;
}
}
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