Simplified version checking.

[oweals/busybox.git] / dutmp.c

diff --git a/dutmp.c b/dutmp.c
index fab1a7b994b57c36c17af215682805834b8521e4..df7f64d30dfaaff27a573443263d7a57e5b618c5 100644 (file)
--- a/dutmp.c
+++ b/dutmp.c
@@ -8,56 +8,57 @@
  * versions of 'who', 'last', etc. IP Addr is output in hex, 
  * little endian on x86.
  * 
- * made against libc6
+ * Modified to support all sorts of libcs by 
+ * Erik Andersen <andersen@lineo.com>
  */
 
-#include "internal.h"
-#include <stdio.h>
-#include <errno.h>
-#define BB_DECLARE_EXTERN
-#define bb_need_io_error
-#include "messages.c"
+#include <sys/types.h>
+#include <fcntl.h>
 
-#if defined(__GLIBC__)
+#include <errno.h>
 #include <utmp.h>
-#else
-#include <utmp-wrap.h>
-#define utmp new_utmp
-#endif
-
-
-static const char dutmp_usage[] = "dutmp [FILE]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-       "\nDump utmp file format (pipe delimited) from FILE\n"
-       "or stdin to stdout.  (i.e. 'dutmp /var/run/utmp')\n"
-#endif
-       ;
+#include <stdlib.h>
+#include <unistd.h>
+#include "busybox.h"
 
 extern int dutmp_main(int argc, char **argv)
 {
 
-       FILE *f;
+       int file;
        struct utmp ut;
 
        if (argc<2) {
-               f = stdin;
+               file = fileno(stdin);
        } else if (*argv[1] == '-' ) {
-               usage(dutmp_usage);
+               show_usage();
        } else  {
-               f = fopen(argv[1], "r");
-               if (f == NULL) {
-                       fatalError(io_error, argv[1], strerror(errno));
+               file = open(argv[1], O_RDONLY);
+               if (file < 0) {
+                       perror_msg_and_die(io_error, argv[1]);
                }
        }
 
-       while (fread(&ut, sizeof(struct utmp), 1, f)) {
+/* Kludge around the fact that the binary format for utmp has changed. */
+#if __GNU_LIBRARY__ < 5 || defined __UCLIBC__
+       /* Linux libc5 */
+       while (read(file, (void*)&ut, sizeof(struct utmp))) {
+               printf("%d|%d|%s|%s|%s|%s|%s|%lx\n",
+                               ut.ut_type, ut.ut_pid, ut.ut_line,
+                               ut.ut_id, ut.ut_user, ut.ut_host,
+                               ctime(&(ut.ut_time)), 
+                               (long)ut.ut_addr);
+       }
+#else
+       /* Glibc, uClibc, etc. */
+       while (read(file, (void*)&ut, sizeof(struct utmp))) {
                printf("%d|%d|%s|%s|%s|%s|%d|%d|%ld|%ld|%ld|%x\n",
-                          ut.ut_type, ut.ut_pid, ut.ut_line,
-                          ut.ut_id, ut.ut_user, ut.ut_host,
-                          ut.ut_exit.e_termination, ut.ut_exit.e_exit,
-                          ut.ut_session, ut.ut_tv.tv_sec, ut.ut_tv.tv_usec, 
-                          ut.ut_addr_v6[0]);
+               ut.ut_type, ut.ut_pid, ut.ut_line,
+               ut.ut_id, ut.ut_user,   ut.ut_host,
+               ut.ut_exit.e_termination, ut.ut_exit.e_exit,
+               ut.ut_session,
+               ut.ut_tv.tv_sec, ut.ut_tv.tv_usec,
+               ut.ut_addr);
        }
-
-       exit(TRUE);
+#endif
+       return EXIT_SUCCESS;
 }