1 files changed, 63 insertions, 0 deletions
diff --git a/lib/yesno.c b/lib/yesno.c
new file mode 100644
index 0000000..63a7f3e
--- /dev/null
+++ b/lib/yesno.c
@@ -0,0 +1,63 @@
+/* yesno.c -- read a yes/no response from stdin
+
+   Copyright (C) 1990, 1998, 2001, 2003-2020 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 3 of the License, 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, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include "yesno.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+/* Return true if we read an affirmative line from standard input.
+
+   Since this function uses stdin, it is suggested that the caller not
+   use STDIN_FILENO directly, and also that the line
+   atexit(close_stdin) be added to main().  */
+
+bool
+yesno (void)
+{
+  bool yes;
+
+#if ENABLE_NLS
+  char *response = NULL;
+  size_t response_size = 0;
+  ssize_t response_len = getline (&response, &response_size, stdin);
+
+  if (response_len <= 0)
+    yes = false;
+  else
+    {
+      /* Remove EOL if present as that's not part of the matched response,
+         and not matched by $ for example.  */
+      if (response[response_len - 1] == '\n')
+        response[response_len - 1] = '\0';
+      yes = (0 < rpmatch (response));
+    }
+
+  free (response);
+#else
+  /* Test against "^[yY]", hardcoded to avoid requiring getline,
+     regex, and rpmatch.  */
+  int c = getchar ();
+  yes = (c == 'y' || c == 'Y');
+  while (c != '\n' && c != EOF)
+    c = getchar ();
+#endif
+
+  return yes;
+}