1 files changed, 111 insertions, 0 deletions
diff --git a/lib/loginprompt.c b/lib/loginprompt.c
new file mode 100644
index 0000000..9b2aa25
--- /dev/null
+++ b/lib/loginprompt.c
@@ -0,0 +1,111 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include "alloc.h"
+#include "attr.h"
+#include "memzero.h"
+#include "prototypes.h"
+#include "defines.h"
+#include "getdef.h"
+
+static void login_exit (MAYBE_UNUSED int sig)
+{
+	_exit (EXIT_FAILURE);
+}
+
+/*
+ * login_prompt - prompt the user for their login name
+ *
+ * login_prompt() displays the standard login prompt.  If ISSUE_FILE
+ * is set in login.defs, this file is displayed before the prompt.
+ */
+
+void login_prompt (char *name, int namesize)
+{
+	char buf[1024];
+
+	char *cp;
+	int i;
+	FILE *fp;
+	const char *fname = getdef_str ("ISSUE_FILE");
+
+	sighandler_t sigquit;
+	sighandler_t sigtstp;
+
+	/*
+	 * There is a small chance that a QUIT character will be part of
+	 * some random noise during a prompt.  Deal with this by exiting
+	 * instead of core dumping.  Do the same thing for SIGTSTP.
+	 */
+
+	sigquit = signal (SIGQUIT, login_exit);
+	sigtstp = signal (SIGTSTP, login_exit);
+
+	/*
+	 * See if the user has configured the issue file to
+	 * be displayed and display it before the prompt.
+	 */
+
+	if (NULL != fname) {
+		fp = fopen (fname, "r");
+		if (NULL != fp) {
+			while ((i = getc (fp)) != EOF) {
+				(void) putc (i, stdout);
+			}
+
+			(void) fclose (fp);
+		}
+	}
+	(void) gethostname (buf, sizeof buf);
+	printf (_("\n%s login: "), buf);
+	(void) fflush (stdout);
+
+	/*
+	 * Read the user's response.  The trailing newline will be
+	 * removed.
+	 */
+
+	MEMZERO(buf);
+	if (fgets (buf, sizeof buf, stdin) != buf) {
+		exit (EXIT_FAILURE);
+	}
+
+	cp = strchr (buf, '\n');
+	if (NULL == cp) {
+		exit (EXIT_FAILURE);
+	}
+	*cp = '\0';		/* remove \n [ must be there ] */
+
+	/*
+	 * Skip leading whitespace.  This makes "  username" work right.
+	 * Then copy the rest (up to the end) into the username.
+	 */
+
+	for (cp = buf; *cp == ' ' || *cp == '\t'; cp++);
+
+	for (i = 0; i < namesize - 1 && *cp != '\0'; name[i++] = *cp++);
+
+	name[i] = '\0';
+
+	/*
+	 * Set the SIGQUIT handler back to its original value
+	 */
+
+	(void) signal (SIGQUIT, sigquit);
+	(void) signal (SIGTSTP, sigtstp);
+}
+