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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* 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
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95
* $FreeBSD$
*/
#include <sys/param.h>
#include <stdlib.h>
#include <stddef.h>
/*
* Routine for dealing with parsed shell commands.
*/
#include "shell.h"
#include "nodes.h"
#include "memalloc.h"
#include "mystring.h"
struct nodesize {
int blocksize; /* size of structures in function */
int stringsize; /* size of strings in node */
};
struct nodecopystate {
pointer block; /* block to allocate function from */
char *string; /* block to allocate strings from */
};
%SIZES
static void calcsize(union node *, struct nodesize *);
static void sizenodelist(struct nodelist *, struct nodesize *);
static union node *copynode(union node *, struct nodecopystate *);
static struct nodelist *copynodelist(struct nodelist *, struct nodecopystate *);
static char *nodesavestr(const char *, struct nodecopystate *);
struct funcdef {
unsigned int refcount;
union node n;
};
/*
* Make a copy of a parse tree.
*/
struct funcdef *
copyfunc(union node *n)
{
struct nodesize sz;
struct nodecopystate st;
struct funcdef *fn;
if (n == NULL)
return NULL;
sz.blocksize = offsetof(struct funcdef, n);
sz.stringsize = 0;
calcsize(n, &sz);
fn = ckmalloc(sz.blocksize + sz.stringsize);
fn->refcount = 1;
st.block = (char *)fn + offsetof(struct funcdef, n);
st.string = (char *)fn + sz.blocksize;
copynode(n, &st);
return fn;
}
union node *
getfuncnode(struct funcdef *fn)
{
return fn == NULL ? NULL : &fn->n;
}
static void
calcsize(union node *n, struct nodesize *result)
{
%CALCSIZE
}
static void
sizenodelist(struct nodelist *lp, struct nodesize *result)
{
while (lp) {
result->blocksize += ALIGN(sizeof(struct nodelist));
calcsize(lp->n, result);
lp = lp->next;
}
}
static union node *
copynode(union node *n, struct nodecopystate *state)
{
union node *new;
%COPY
return new;
}
static struct nodelist *
copynodelist(struct nodelist *lp, struct nodecopystate *state)
{
struct nodelist *start;
struct nodelist **lpp;
lpp = &start;
while (lp) {
*lpp = state->block;
state->block = (char *)state->block +
ALIGN(sizeof(struct nodelist));
(*lpp)->n = copynode(lp->n, state);
lp = lp->next;
lpp = &(*lpp)->next;
}
*lpp = NULL;
return start;
}
static char *
nodesavestr(const char *s, struct nodecopystate *state)
{
const char *p = s;
char *q = state->string;
char *rtn = state->string;
while ((*q++ = *p++) != '\0')
continue;
state->string = q;
return rtn;
}
void
reffunc(struct funcdef *fn)
{
if (fn)
fn->refcount++;
}
/*
* Decrement the reference count of a function definition, freeing it
* if it falls to 0.
*/
void
unreffunc(struct funcdef *fn)
{
if (fn) {
fn->refcount--;
if (fn->refcount > 0)
return;
ckfree(fn);
}
}
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