[svn-upgrade] Integrating new upstream version, shadow (19990709)

lib/utent.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright 1993 - 1994, Julianne Frances Haugh
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#ifndef	HAVE_GETUTENT
+
+#include "defines.h"
+#include <stdio.h>
+#include <fcntl.h>
+#include <utmp.h>
+
+#ifndef	lint
+static char rcsid[] = "$Id: utent.c,v 1.4 1998/01/29 23:22:32 marekm Exp $";
+#endif
+
+static	int	utmp_fd = -1;
+static	struct	utmp	utmp_buf;
+
+/*
+ * setutent - open or rewind the utmp file
+ */
+
+void
+setutent(void)
+{
+	if (utmp_fd == -1)
+		if ((utmp_fd = open (_UTMP_FILE, O_RDWR)) == -1)
+			utmp_fd = open (_UTMP_FILE, O_RDONLY);
+
+	if (utmp_fd != -1)
+		lseek (utmp_fd, (off_t) 0L, SEEK_SET);
+}
+
+/*
+ * endutent - close the utmp file
+ */
+
+void
+endutent(void)
+{
+	if (utmp_fd != -1)
+		close (utmp_fd);
+
+	utmp_fd = -1;
+}
+
+/*
+ * getutent - get the next record from the utmp file
+ */
+
+struct utmp *
+getutent(void)
+{
+	if (utmp_fd == -1)
+		setutent ();
+
+	if (utmp_fd == -1)
+		return 0;
+
+	if (read (utmp_fd, &utmp_buf, sizeof utmp_buf) != sizeof utmp_buf)
+		return 0;
+
+	return &utmp_buf;
+}
+
+/*
+ * getutline - get the utmp entry matching ut_line
+ */
+
+struct utmp *
+getutline(const struct utmp *utent)
+{
+	struct	utmp	save;
+	struct	utmp	*new;
+
+	save = *utent;
+	while (new = getutent ())
+		if (strncmp (new->ut_line, save.ut_line, sizeof new->ut_line))
+			continue;
+		else
+			return new;
+
+	return (struct utmp *) 0;
+}
+#else
+extern int errno;  /* warning: ANSI C forbids an empty source file */
+#endif