1 files changed, 87 insertions, 0 deletions
diff --git a/lib/yesno.c b/lib/yesno.c
new file mode 100644
index 0000000..029cd81
--- /dev/null
+++ b/lib/yesno.c
@@ -0,0 +1,87 @@
+/*
+ * SPDX-FileCopyrightText: 1992 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
+ * SPDX-FileCopyrightText: 2023, Alejandro Colomar <alx@kernel.org>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "prototypes.h"
+
+
+/*
+ * Synopsis
+ *	bool yes_or_no(bool read_only);
+ *
+ * Arguments
+ *	read_only
+ *		In read-only mode, all questions are answered "no".  It
+ *		will print "No" to stdout.
+ *
+ * Description
+ *	After a yes/no question, this function gets the answer from the
+ *	user.
+ *
+ *	Calls to this function will normally be preceeded by a prompt on
+ *	stdout, so we should fflush(3).
+ *
+ * Return value
+ *	false	"no"
+ *	true	"yes"
+ *
+ * See also
+ *	rpmatch(3)
+ */
+
+
+#if !defined(HAVE_RPMATCH)
+static int rpmatch(const char *response);
+#endif
+
+
+bool
+yes_or_no(bool read_only)
+{
+	bool   ret;
+	char   *buf;
+	size_t size;
+
+	if (read_only) {
+		puts(_("No"));
+		return false;
+	}
+
+	fflush(stdout);
+
+	buf = NULL;
+	ret = false;
+	size = 0;
+	if (getline(&buf, &size, stdin) != -1)
+		ret = rpmatch(buf) == 1;
+
+	free(buf);
+	return ret;
+}
+
+
+#if !defined(HAVE_RPMATCH)
+static int
+rpmatch(const char *response)
+{
+	if (response[0] == 'y' || response[0] == 'Y')
+		return 1;
+
+	if (response[0] == 'n' || response[0] == 'n')
+		return 0;
+
+	return -1;
+}
+#endif