unset variable with ENV{VAR}=""

[elogind.git] / udev_utils.c

diff --git a/udev_utils.c b/udev_utils.c
index a37c4dfe7492f2927b0f7d1660e791ec32ba5533..6d646b0ee6f1f51f4c0f0969d6da2f2b4b6dc5e5 100644 (file)
--- a/udev_utils.c
+++ b/udev_utils.c
@@ -1,6 +1,4 @@
 /*
- * udev_utils.c - generic stuff used by udev
- *
  * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
  *
  *     This program is free software; you can redistribute it and/or modify it
@@ -14,7 +12,7 @@
  * 
  *     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.
+ *     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  *
  */
 
@@ -28,6 +26,9 @@
 #include <ctype.h>
 #include <dirent.h>
 #include <syslog.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/types.h>
 #include <sys/utsname.h>
 
 #include "udev.h"
@@ -53,7 +54,7 @@ int log_priority(const char *priority)
        return 0;
 }
 
-int name_list_add(struct list_head *name_list, const char *name, int sort)
+char *name_list_add(struct list_head *name_list, const char *name, int sort)
 {
        struct name_entry *loop_name;
        struct name_entry *new_name;
@@ -62,7 +63,7 @@ int name_list_add(struct list_head *name_list, const char *name, int sort)
                /* avoid doubles */
                if (strcmp(loop_name->name, name) == 0) {
                        dbg("'%s' is already in the list", name);
-                       return 0;
+                       return loop_name->name;
                }
        }
 
@@ -73,19 +74,17 @@ int name_list_add(struct list_head *name_list, const char *name, int sort)
                }
 
        new_name = malloc(sizeof(struct name_entry));
-       if (new_name == NULL) {
-               dbg("error malloc");
-               return -ENOMEM;
-       }
+       if (new_name == NULL)
+               return NULL;
 
        strlcpy(new_name->name, name, sizeof(new_name->name));
        dbg("adding '%s'", new_name->name);
        list_add_tail(&new_name->node, &loop_name->node);
 
-       return 0;
+       return new_name->name;
 }
 
-int name_list_key_add(struct list_head *name_list, const char *key, const char *value)
+char *name_list_key_add(struct list_head *name_list, const char *key, const char *value)
 {
        struct name_entry *loop_name;
        struct name_entry *new_name;
@@ -95,22 +94,40 @@ int name_list_key_add(struct list_head *name_list, const char *key, const char *
                        dbg("key already present '%s', replace it", loop_name->name);
                        snprintf(loop_name->name, sizeof(loop_name->name), "%s=%s", key, value);
                        loop_name->name[sizeof(loop_name->name)-1] = '\0';
-                       return 0;
+                       return loop_name->name;
                }
        }
 
        new_name = malloc(sizeof(struct name_entry));
-       if (new_name == NULL) {
-               dbg("error malloc");
-               return -ENOMEM;
-       }
+       if (new_name == NULL)
+               return NULL;
 
        snprintf(new_name->name, sizeof(new_name->name), "%s=%s", key, value);
        new_name->name[sizeof(new_name->name)-1] = '\0';
        dbg("adding '%s'", new_name->name);
        list_add_tail(&new_name->node, &loop_name->node);
 
-       return 0;
+       return new_name->name;
+}
+
+int name_list_key_remove(struct list_head *name_list, const char *key)
+{
+       struct name_entry *name_loop;
+       struct name_entry *temp_loop;
+       size_t keylen = strlen(key);
+       int retval = 0;
+
+       list_for_each_entry_safe(name_loop, temp_loop, name_list, node) {
+               if (strncmp(name_loop->name, key, keylen) != 0)
+                       continue;
+               if (name_loop->name[keylen] != '=')
+                       continue;
+               list_del(&name_loop->node);
+               free(name_loop);
+               retval = 1;
+               break;
+       }
+       return retval;
 }
 
 void name_list_cleanup(struct list_head *name_list)
@@ -129,7 +146,6 @@ int add_matching_files(struct list_head *name_list, const char *dirname, const c
 {
        struct dirent *ent;
        DIR *dir;
-       char *ext;
        char filename[PATH_SIZE];
 
        dbg("open directory '%s'", dirname);
@@ -148,14 +164,16 @@ int add_matching_files(struct list_head *name_list, const char *dirname, const c
                        continue;
 
                /* look for file matching with specified suffix */
-               ext = strrchr(ent->d_name, '.');
-               if (ext == NULL)
-                       continue;
-
-               if (strcmp(ext, suffix) != 0)
-                       continue;
-
-               dbg("put file '%s/%s' in list", dirname, ent->d_name);
+               if (suffix != NULL) {
+                       const char *ext;
+
+                       ext = strrchr(ent->d_name, '.');
+                       if (ext == NULL)
+                               continue;
+                       if (strcmp(ext, suffix) != 0)
+                               continue;
+               }
+               dbg("put file '%s/%s' into list", dirname, ent->d_name);
 
                snprintf(filename, sizeof(filename), "%s/%s", dirname, ent->d_name);
                filename[sizeof(filename)-1] = '\0';
@@ -165,3 +183,40 @@ int add_matching_files(struct list_head *name_list, const char *dirname, const c
        closedir(dir);
        return 0;
 }
+
+uid_t lookup_user(const char *user)
+{
+       struct passwd *pw;
+       uid_t uid = 0;
+
+       errno = 0;
+       pw = getpwnam(user);
+       if (pw == NULL) {
+               if (errno == 0 || errno == ENOENT || errno == ESRCH)
+                       err("specified user '%s' unknown", user);
+               else
+                       err("error resolving user '%s': %s", user, strerror(errno));
+       } else
+               uid = pw->pw_uid;
+
+       return uid;
+}
+
+extern gid_t lookup_group(const char *group)
+{
+       struct group *gr;
+       gid_t gid = 0;
+
+       errno = 0;
+       gr = getgrnam(group);
+       if (gr == NULL) {
+               if (errno == 0 || errno == ENOENT || errno == ESRCH)
+                       err("specified group '%s' unknown", group);
+               else
+                       err("error resolving group '%s': %s", group, strerror(errno));
+       } else
+               gid = gr->gr_gid;
+
+       return gid;
+}
+