cmap.c revision 163bd69b3c164dda2a59c7f08ca788e7d6ba9bea
/*
* Copyright (c) 2004 Tim J. Robbins.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* "Character map" ADT. Stores mappings between pairs of characters in a
* splay tree, with a lookup table cache to simplify looking up the first
* bunch of characters (which are presumably more common than others).
*/
#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>
#include <wchar.h>
#include "cmap.h"
/*
* cmap_alloc --
* Allocate a character map.
*/
struct cmap *
cmap_alloc(void)
{
return (NULL);
cm->cm_havecache = false;
return (cm);
}
/*
* cmap_add --
* Add a mapping from "from" to "to" to the map.
*/
bool
{
cm->cm_havecache = false;
return (false);
return (true);
}
return (true);
}
return (false);
} else {
}
return (true);
}
/*
* cmap_lookup_hard --
* Look up the mapping for a character without using the cache.
*/
{
}
}
/*
* cmap_cache --
* Update the cache.
*/
void
{
cm->cm_havecache = true;
}
/*
* cmap_default --
* Change the value that characters without mappings map to, and
* return the old value. The special character value CM_MAP_SELF
* means characters map to themselves.
*/
{
cm->cm_havecache = false;
return (old);
}
static struct cmapnode *
{
struct cmapnode N, *l, *r, *y;
/*
* Based on public domain code from Sleator.
*/
l = r = &N;
for (;;) {
y = t->cmn_left;
y->cmn_right = t;
t = y;
}
break;
r->cmn_left = t;
r = t;
t = t->cmn_left;
y = t->cmn_right;
y->cmn_left = t;
t = y;
}
break;
l->cmn_right = t;
l = t;
t = t->cmn_right;
} else
break;
}
return (t);
}