/* idcache.c -- map user and group IDs, cached for speed
- Copyright (C) 1985, 1988, 1989, 1990 Free Software Foundation, Inc.
+ Copyright (C) 1985, 1988, 1989, 1990, 1997, 1998 Free Software
+ Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
#include <stdio.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
-#if defined(USG) || defined(STDC_HEADERS)
-#include <string.h>
+#if STDC_HEADERS || HAVE_STRING_H
+# include <string.h>
#else
-#include <strings.h>
+# include <strings.h>
#endif
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+#if HAVE_UNISTD_H
+# include <unistd.h>
#endif
+
#ifndef _POSIX_VERSION
struct passwd *getpwuid ();
struct passwd *getpwnam ();
char *xmalloc ();
char *xstrdup ();
+#ifdef __DJGPP__
+static char digits[] = "0123456789";
+#endif
+
struct userid
{
union
/* The members of this list have names not in the local passwd file. */
static struct userid *nouser_alist;
-/* Translate UID to a login name or a stringified number,
- with cache. */
+/* Translate UID to a login name, with cache, or NULL if unresolved. */
char *
-getuser (uid)
- uid_t uid;
+getuser (uid_t uid)
{
register struct userid *tail;
struct passwd *pwent;
- char usernum_string[20];
for (tail = user_alist; tail; tail = tail->next)
if (tail->id.u == uid)
pwent = getpwuid (uid);
tail = (struct userid *) xmalloc (sizeof (struct userid));
tail->id.u = uid;
- if (pwent == 0)
- {
- sprintf (usernum_string, "%u", (unsigned) uid);
- tail->name = xstrdup (usernum_string);
- }
- else
- tail->name = xstrdup (pwent->pw_name);
+ tail->name = pwent ? xstrdup (pwent->pw_name) : NULL;
/* Add to the head of the list, so most recently used is first. */
tail->next = user_alist;
so we don't keep looking them up.) */
uid_t *
-getuidbyname (user)
- char *user;
+getuidbyname (const char *user)
{
register struct userid *tail;
struct passwd *pwent;
return 0;
pwent = getpwnam (user);
+#ifdef __DJGPP__
+ /* We need to pretend to be the user USER, to make
+ pwd functions know about an arbitrary user name. */
+ if (!pwent && strspn (user, digits) < strlen (user))
+ {
+ setenv ("USER", user, 1);
+ pwent = getpwnam (user); /* now it will succeed */
+ }
+#endif
tail = (struct userid *) xmalloc (sizeof (struct userid));
tail->name = xstrdup (user);
static struct userid *group_alist;
static struct userid *nogroup_alist;
-/* Translate GID to a group name or a stringified number,
- with cache. */
+/* Translate GID to a group name, with cache, or NULL if unresolved. */
char *
-getgroup (gid)
- gid_t gid;
+getgroup (gid_t gid)
{
register struct userid *tail;
struct group *grent;
- char groupnum_string[20];
for (tail = group_alist; tail; tail = tail->next)
if (tail->id.g == gid)
grent = getgrgid (gid);
tail = (struct userid *) xmalloc (sizeof (struct userid));
tail->id.g = gid;
- if (grent == 0)
- {
- sprintf (groupnum_string, "%u", (unsigned int) gid);
- tail->name = xstrdup (groupnum_string);
- }
- else
- tail->name = xstrdup (grent->gr_name);
+ tail->name = grent ? xstrdup (grent->gr_name) : NULL;
/* Add to the head of the list, so most recently used is first. */
tail->next = group_alist;
return tail->name;
}
-/* Translate GROUP to a UID, with cache.
+/* Translate GROUP to a GID, with cache.
Return NULL if there is no such group.
(We also cache which group names have no group entry,
so we don't keep looking them up.) */
gid_t *
-getgidbyname (group)
- char *group;
+getgidbyname (const char *group)
{
register struct userid *tail;
struct group *grent;
return 0;
grent = getgrnam (group);
+#ifdef __DJGPP__
+ /* We need to pretend to belong to group GROUP, to make
+ grp functions know about any arbitrary group name. */
+ if (!grent && strspn (group, digits) < strlen (group))
+ {
+ setenv ("GROUP", group, 1);
+ grent = getgrnam (group); /* now it will succeed */
+ }
+#endif
tail = (struct userid *) xmalloc (sizeof (struct userid));
tail->name = xstrdup (group);
group_alist = tail;
return &tail->id.g;
}
-
+
tail->next = nogroup_alist;
nogroup_alist = tail;
return 0;