chiark / gitweb /
Merge keymap building in the top-level Makefile.am.
[elogind.git] / libudev / libudev-util-private.c
index f7daa94..00d1c95 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * libudev - interface to udev device information
  *
- * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -149,8 +149,8 @@ uid_t util_lookup_user(struct udev *udev, const char *user)
 gid_t util_lookup_group(struct udev *udev, const char *group)
 {
        char *endptr;
-       int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
-       char buf[buflen];
+       int buflen;
+       char *buf;
        struct group grbuf;
        struct group *gr;
        gid_t gid = 0;
@@ -161,15 +161,31 @@ gid_t util_lookup_group(struct udev *udev, const char *group)
        if (endptr[0] == '\0')
                return gid;
 
-       errno = 0;
-       getgrnam_r(group, &grbuf, buf, buflen, &gr);
-       if (gr != NULL)
-               return gr->gr_gid;
-       if (errno == 0 || errno == ENOENT || errno == ESRCH)
-               err(udev, "specified group '%s' unknown\n", group);
-       else
-               err(udev, "error resolving group '%s': %m\n", group);
-       return 0;
+       buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+       if (buflen < 0)
+               buflen = 1000;
+       buf = NULL;
+       gid = 0;
+       for (;;) {
+               buf = realloc(buf, buflen);
+               if (!buf)
+                       break;
+               errno = 0;
+               getgrnam_r(group, &grbuf, buf, buflen, &gr);
+               if (gr != NULL)
+                       gid = gr->gr_gid;
+               else if (errno == ERANGE) {
+                       buflen *= 2;
+                       continue;
+               }
+               else if (errno == 0 || errno == ENOENT || errno == ESRCH)
+                       err(udev, "specified group '%s' unknown\n", group);
+               else
+                       err(udev, "error resolving group '%s': %m\n", group);
+               break;
+       }
+       free(buf);
+       return gid;
 }
 
 /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */