1 files changed, 133 insertions, 0 deletions
diff --git a/contrib/tar/lib/readutmp.c b/contrib/tar/lib/readutmp.c
new file mode 100644
index 0000000..29b24a5
--- /dev/null
+++ b/contrib/tar/lib/readutmp.c
@@ -0,0 +1,133 @@
+/* GNU's read utmp module.
+   Copyright (C) 1992-2000 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
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by jla; revised by djm */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
+# include <string.h>
+#else
+# include <strings.h>
+#endif /* STDC_HEADERS || HAVE_STRING_H */
+
+#include "readutmp.h"
+
+char *xmalloc ();
+char *realloc ();
+
+/* Copy UT->ut_name into storage obtained from malloc.  Then remove any
+   trailing spaces from the copy, NUL terminate it, and return the copy.  */
+
+char *
+extract_trimmed_name (const STRUCT_UTMP *ut)
+{
+  char *p, *trimmed_name;
+
+  trimmed_name = xmalloc (sizeof (UT_USER (ut)) + 1);
+  strncpy (trimmed_name, UT_USER (ut), sizeof (UT_USER (ut)));
+  /* Append a trailing space character.  Some systems pad names shorter than
+     the maximum with spaces, others pad with NULs.  Remove any spaces.  */
+  trimmed_name[sizeof (UT_USER (ut))] = ' ';
+  p = strchr (trimmed_name, ' ');
+  if (p != NULL)
+    *p = '\0';
+  return trimmed_name;
+}
+
+/* Read the utmp entries corresponding to file FILENAME into freshly-
+   malloc'd storage, set *UTMP_BUF to that pointer, set *N_ENTRIES to
+   the number of entries, and return zero.  If there is any error,
+   return non-zero and don't modify the parameters.  */
+
+#ifdef UTMP_NAME_FUNCTION
+
+int
+read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
+{
+  int n_read;
+  STRUCT_UTMP *u;
+  STRUCT_UTMP *utmp = NULL;
+
+  /* Ignore the return value for now.
+     Solaris' utmpname returns 1 upon success -- which is contrary
+     to what the GNU libc version does.  In addition, older GNU libc
+     versions are actually void.   */
+  UTMP_NAME_FUNCTION (filename);
+
+  SET_UTMP_ENT ();
+
+  n_read = 0;
+  while ((u = GET_UTMP_ENT ()) != NULL)
+    {
+      ++n_read;
+      utmp = (STRUCT_UTMP *) realloc (utmp, n_read * sizeof (STRUCT_UTMP));
+      if (utmp == NULL)
+	return 1;
+      utmp[n_read - 1] = *u;
+    }
+
+  END_UTMP_ENT ();
+
+  *n_entries = n_read;
+  *utmp_buf = utmp;
+
+  return 0;
+}
+
+#else
+
+int
+read_utmp (const char *filename, int *n_entries, STRUCT_UTMP **utmp_buf)
+{
+  FILE *utmp;
+  struct stat file_stats;
+  size_t n_read;
+  size_t size;
+  STRUCT_UTMP *buf;
+
+  utmp = fopen (filename, "r");
+  if (utmp == NULL)
+    return 1;
+
+  fstat (fileno (utmp), &file_stats);
+  size = file_stats.st_size;
+  if (size > 0)
+    buf = (STRUCT_UTMP *) xmalloc (size);
+  else
+    {
+      fclose (utmp);
+      return 1;
+    }
+
+  /* Use < instead of != in case the utmp just grew.  */
+  n_read = fread (buf, 1, size, utmp);
+  if (ferror (utmp) || fclose (utmp) == EOF
+      || n_read < size)
+    return 1;
+
+  *n_entries = size / sizeof (STRUCT_UTMP);
+  *utmp_buf = buf;
+
+  return 0;
+}
+
+#endif