adding core/isatty

CMakeLists.txt

@@ -38,6 +38,7 @@ set (PROGRAM_SOURCE
 	src/core/file.cpp
 	src/core/dictionary.cpp
 	src/core/string.cpp
+	src/core/isatty.cpp
 	src/crypto/base58.cpp
 	src/crypto/WIF.cpp
 	src/console.cpp

src/core/isatty.cpp

@@ -0,0 +1,21 @@
+#if _WIN32
+#include <io.h>
+#else
+#include <unistd.h>
+#define _isatty isatty
+#define _fileno fileno
+#endif
+#include "isatty.h"
+
+namespace eoskeygen {
+
+bool isatty(int fd) {
+    return ::_isatty(fd);
+}
+
+bool isatty(FILE* fd) {
+	// fileno() segfaults if fd is null.
+    return fd ? isatty(_fileno(fd)) : false;
+}
+
+} // namespace eoskeygen

src/core/isatty.h

@@ -0,0 +1,37 @@
+/**
+ * MIT License
+ *
+ * Copyright (c) 2019-2020 EOS Sw/eden
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef EOSIOKEYGEN_CORE_ISATTY_H
+#define EOSIOKEYGEN_CORE_ISATTY_H
+
+#include <stdio.h>
+
+namespace eoskeygen {
+
+bool isatty(int fd);
+
+bool isatty(FILE* fd);
+
+} // namespace eoskeygen
+
+#endif /* EOSIOKEYGEN_CORE_ISATTY_H */