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util-linux/lib/idcache.c

113 lines
1.8 KiB

#include <wchar.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include "c.h"
#include "idcache.h"
struct identry *get_id(struct idcache *ic, unsigned long int id)
{
struct identry *ent;
if (!ic)
return NULL;
for (ent = ic->ent; ent; ent = ent->next) {
if (ent->id == id)
return ent;
}
return NULL;
}
struct idcache *new_idcache()
{
return calloc(1, sizeof(struct idcache));
}
void free_idcache(struct idcache *ic)
{
struct identry *ent = ic->ent;
while (ent) {
struct identry *next = ent->next;
free(ent->name);
free(ent);
ent = next;
}
free(ic);
}
static void add_id(struct idcache *ic, char *name, unsigned long int id)
{
struct identry *ent, *x;
int w = 0;
ent = calloc(1, sizeof(struct identry));
if (!ent)
return;
ent->id = id;
if (name) {
#ifdef HAVE_WIDECHAR
wchar_t wc[LOGIN_NAME_MAX + 1];
if (mbstowcs(wc, name, LOGIN_NAME_MAX) > 0) {
wc[LOGIN_NAME_MAX] = '\0';
w = wcswidth(wc, LOGIN_NAME_MAX);
}
else
#endif
w = strlen(name);
}
/* note, we ignore names with non-printable widechars */
if (w > 0) {
ent->name = strdup(name);
if (!ent->name) {
free(ent);
return;
}
} else {
if (asprintf(&ent->name, "%lu", id) < 0) {
free(ent);
return;
}
}
for (x = ic->ent; x && x->next; x = x->next);
if (x)
x->next = ent;
else
ic->ent = ent;
if (w <= 0)
w = ent->name ? strlen(ent->name) : 0;
ic->width = ic->width < w ? w : ic->width;
return;
}
void add_uid(struct idcache *cache, unsigned long int id)
{
struct identry *ent= get_id(cache, id);
if (!ent) {
struct passwd *pw = getpwuid((uid_t) id);
add_id(cache, pw ? pw->pw_name : NULL, id);
}
}
void add_gid(struct idcache *cache, unsigned long int id)
{
struct identry *ent = get_id(cache, id);
if (!ent) {
struct group *gr = getgrgid((gid_t) id);
add_id(cache, gr ? gr->gr_name : NULL, id);
}
}