Add ncurses 6.4

third_party/ncurses/doalloc.c

@@ -0,0 +1,62 @@
+/****************************************************************************
+ * Copyright 2020,2021 Thomas E. Dickey                                     *
+ * Copyright 1998-2002,2012 Free Software Foundation, Inc.                  *
+ *                                                                          *
+ * 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, distribute with modifications, 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 ABOVE 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.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+
+/****************************************************************************
+ *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
+ ****************************************************************************/
+
+/*
+ * Wrapper for malloc/realloc.  Standard implementations allow realloc with
+ * a null pointer, but older libraries may not (e.g., SunOS).
+ *
+ * Also if realloc fails, we discard the old memory to avoid leaks.
+ */
+
+#include "curses.priv.h"
+
+MODULE_ID("$Id: doalloc.c,v 1.14 2021/04/24 23:43:39 tom Exp $")
+
+void *
+_nc_doalloc(void *oldp, size_t amount)
+{
+    void *newp;
+
+    if (oldp != NULL) {
+	if (amount == 0) {
+	    free(oldp);
+	    newp = NULL;
+	} else if ((newp = realloc(oldp, amount)) == 0) {
+	    free(oldp);
+	    errno = ENOMEM;	/* just in case 'free' reset */
+	}
+    } else {
+	newp = malloc(amount);
+    }
+    return newp;
+}