/* $NetBSD: ptable.h,v 1.1.1.1 2016/01/13 18:41:48 christos Exp $ */
// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992, 2003, 2004
Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff 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 2, or (at your option) any later
version.
groff 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 groff; see the file COPYING. If not, write to the Free Software
Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
#include <assert.h>
#include <string.h>
#ifdef TRADITIONAL_CPP
#define name2(a,b) a/**/b
#else /* not TRADITIONAL_CPP */
#define name2(a,b) name2x(a,b)
#define name2x(a,b) a ## b
#endif /* not TRADITIONAL_CPP */
#define PTABLE(T) name2(T,_ptable)
#define PASSOC(T) name2(T,_passoc)
#define PTABLE_ITERATOR(T) name2(T,_ptable_iterator)
extern unsigned next_ptable_size(unsigned);
extern unsigned long hash_string(const char *);
#define declare_ptable(T) \
\
struct PASSOC(T) { \
char *key; \
T *val; \
PASSOC(T)(); \
}; \
\
class PTABLE(T); \
\
class PTABLE_ITERATOR(T) { \
PTABLE(T) *p; \
unsigned i; \
public: \
PTABLE_ITERATOR(T)(PTABLE(T) *); \
int next(const char **, T **); \
}; \
\
class PTABLE(T) { \
PASSOC(T) *v; \
unsigned size; \
unsigned used; \
enum { FULL_NUM = 2, FULL_DEN = 3, INITIAL_SIZE = 17 }; \
public: \
PTABLE(T)(); \
~PTABLE(T)(); \
void define(const char *, T *); \
T *lookup(const char *); \
friend class PTABLE_ITERATOR(T); \
};
// Keys (which are strings) are allocated and freed by PTABLE.
// Values must be allocated by the caller (always using new[], not new)
// and are freed by PTABLE.
#define implement_ptable(T) \
\
PASSOC(T)::PASSOC(T)() \
: key(0), val(0) \
{ \
} \
\
PTABLE(T)::PTABLE(T)() \
{ \
v = new PASSOC(T)[size = INITIAL_SIZE]; \
used = 0; \
} \
\
PTABLE(T)::~PTABLE(T)() \
{ \
for (unsigned i = 0; i < size; i++) { \
a_delete v[i].key; \
a_delete v[i].val; \
} \
a_delete v; \
} \
\
void PTABLE(T)::define(const char *key, T *val) \
{ \
assert(key != 0); \
unsigned long h = hash_string(key); \
unsigned n; \
for (n = unsigned(h % size); \
v[n].key != 0; \
n = (n == 0 ? size - 1 : n - 1)) \
if (strcmp(v[n].key, key) == 0) { \
a_delete v[n].val; \
v[n].val = val; \
return; \
} \
if (val == 0) \
return; \
if (used*FULL_DEN >= size*FULL_NUM) { \
PASSOC(T) *oldv = v; \
unsigned old_size = size; \
size = next_ptable_size(size); \
v = new PASSOC(T)[size]; \
for (unsigned i = 0; i < old_size; i++) \
if (oldv[i].key != 0) { \
if (oldv[i].val == 0) \
a_delete oldv[i].key; \
else { \
unsigned j; \
for (j = unsigned(hash_string(oldv[i].key) % size); \
v[j].key != 0; \
j = (j == 0 ? size - 1 : j - 1)) \
; \
v[j].key = oldv[i].key; \
v[j].val = oldv[i].val; \
} \
} \
for (n = unsigned(h % size); \
v[n].key != 0; \
n = (n == 0 ? size - 1 : n - 1)) \
; \
a_delete oldv; \
} \
char *temp = new char[strlen(key)+1]; \
strcpy(temp, key); \
v[n].key = temp; \
v[n].val = val; \
used++; \
} \
\
T *PTABLE(T)::lookup(const char *key) \
{ \
assert(key != 0); \
for (unsigned n = unsigned(hash_string(key) % size); \
v[n].key != 0; \
n = (n == 0 ? size - 1 : n - 1)) \
if (strcmp(v[n].key, key) == 0) \
return v[n].val; \
return 0; \
} \
\
PTABLE_ITERATOR(T)::PTABLE_ITERATOR(T)(PTABLE(T) *t) \
: p(t), i(0) \
{ \
} \
\
int PTABLE_ITERATOR(T)::next(const char **keyp, T **valp) \
{ \
unsigned size = p->size; \
PASSOC(T) *v = p->v; \
for (; i < size; i++) \
if (v[i].key != 0) { \
*keyp = v[i].key; \
*valp = v[i].val; \
i++; \
return 1; \
} \
return 0; \
}