Add ncurses 6.4

third_party/ncurses/tries.c

@@ -0,0 +1,146 @@
+/****************************************************************************
+ * Copyright 2020 Thomas E. Dickey                                          *
+ * Copyright 1998-2009,2010 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> 1997                        *
+ ****************************************************************************/
+
+/*
+**	tries.c
+**
+**	Functions to manage the tree of partial-completions for keycodes.
+**
+*/
+
+#include "curses.priv.h"
+
+MODULE_ID("$Id: tries.c,v 1.31 2020/02/02 23:34:34 tom Exp $")
+
+/*
+ * Expand a keycode into the string that it corresponds to, returning null if
+ * no match was found, otherwise allocating a string of the result.
+ */
+NCURSES_EXPORT(char *)
+_nc_expand_try(TRIES * tree, unsigned code, int *count, size_t len)
+{
+    TRIES *ptr = tree;
+    char *result = 0;
+
+    if (code != 0) {
+	while (ptr != 0) {
+	    if ((result = _nc_expand_try(ptr->child, code, count, len + 1))
+		!= 0) {
+		break;
+	    }
+	    if (ptr->value == code) {
+		*count -= 1;
+		if (*count == -1) {
+		    result = typeCalloc(char, len + 2);
+		    break;
+		}
+	    }
+	    ptr = ptr->sibling;
+	}
+    }
+    if (result != 0) {
+	if (ptr != 0 && (result[len] = (char) ptr->ch) == 0)
+	    *((unsigned char *) (result + len)) = 128;
+#ifdef TRACE
+	if (len == 0 && USE_TRACEF(TRACE_MAXIMUM)) {
+	    _tracef("expand_key %s %s",
+		    _nc_tracechar(CURRENT_SCREEN, (int) code),
+		    _nc_visbuf(result));
+	    _nc_unlock_global(tracef);
+	}
+#endif
+    }
+    return result;
+}
+
+/*
+ * Remove a code from the specified tree, freeing the unused nodes.  Returns
+ * true if the code was found/removed.
+ */
+NCURSES_EXPORT(int)
+_nc_remove_key(TRIES ** tree, unsigned code)
+{
+    T((T_CALLED("_nc_remove_key(%p,%d)"), (void *) tree, code));
+
+    if (code == 0)
+	returnCode(FALSE);
+
+    while (*tree != 0) {
+	if (_nc_remove_key(&(*tree)->child, code)) {
+	    returnCode(TRUE);
+	}
+	if ((*tree)->value == code) {
+	    if ((*tree)->child) {
+		/* don't cut the whole sub-tree */
+		(*tree)->value = 0;
+	    } else {
+		TRIES *to_free = *tree;
+		*tree = (*tree)->sibling;
+		free(to_free);
+	    }
+	    returnCode(TRUE);
+	}
+	tree = &(*tree)->sibling;
+    }
+    returnCode(FALSE);
+}
+
+/*
+ * Remove a string from the specified tree, freeing the unused nodes.  Returns
+ * true if the string was found/removed.
+ */
+NCURSES_EXPORT(int)
+_nc_remove_string(TRIES ** tree, const char *string)
+{
+    T((T_CALLED("_nc_remove_string(%p,%s)"), (void *) tree, _nc_visbuf(string)));
+
+    if (string == 0 || *string == 0)
+	returnCode(FALSE);
+
+    while (*tree != 0) {
+	if (UChar((*tree)->ch) == UChar(*string)) {
+	    if (string[1] != 0)
+		returnCode(_nc_remove_string(&(*tree)->child, string + 1));
+	    if ((*tree)->child == 0) {
+		TRIES *to_free = *tree;
+		*tree = (*tree)->sibling;
+		free(to_free);
+		returnCode(TRUE);
+	    } else {
+		returnCode(FALSE);
+	    }
+	}
+	tree = &(*tree)->sibling;
+    }
+    returnCode(FALSE);
+}