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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 "files.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));
(void)strcpy(ud.name, thispw->pw_name);
}
else
{
int digits = 2, uid_copy = uid;
/* Count the number of digits we'll need. */
for (; uid_copy; digits++, uid_copy /= 10);
ud.name = (char *) xmalloc (sizeof (char) * digits);
(void)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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