e16947f83d
Empty pairs of braces are represented by a NULL node pointer, just like empty lines at the top level. Support for empty pairs of braces may be removed later. They make the code more complex, have inconsistent behaviour (may or may not change $?), are not specified by POSIX and are not allowed by some other shells like bash, dash and ksh93. Reported by: kan
186 lines
4.0 KiB
Plaintext
186 lines
4.0 KiB
Plaintext
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <stdlib.h>
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#include <stddef.h>
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/*
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* Routine for dealing with parsed shell commands.
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*/
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#include "shell.h"
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#include "nodes.h"
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#include "memalloc.h"
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#include "mystring.h"
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STATIC int funcblocksize; /* size of structures in function */
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STATIC int funcstringsize; /* size of strings in node */
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STATIC pointer funcblock; /* block to allocate function from */
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STATIC char *funcstring; /* block to allocate strings from */
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%SIZES
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STATIC void calcsize(union node *);
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STATIC void sizenodelist(struct nodelist *);
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STATIC union node *copynode(union node *);
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STATIC struct nodelist *copynodelist(struct nodelist *);
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STATIC char *nodesavestr(char *);
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struct funcdef {
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unsigned int refcount;
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union node n;
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};
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/*
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* Make a copy of a parse tree.
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*/
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struct funcdef *
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copyfunc(union node *n)
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{
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struct funcdef *fn;
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if (n == NULL)
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return NULL;
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funcblocksize = offsetof(struct funcdef, n);
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funcstringsize = 0;
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calcsize(n);
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fn = ckmalloc(funcblocksize + funcstringsize);
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fn->refcount = 1;
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funcblock = (char *)fn + offsetof(struct funcdef, n);
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funcstring = (char *)fn + funcblocksize;
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copynode(n);
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return fn;
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}
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union node *
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getfuncnode(struct funcdef *fn)
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{
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return fn == NULL ? NULL : &fn->n;
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}
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STATIC void
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calcsize(union node *n)
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{
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%CALCSIZE
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}
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STATIC void
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sizenodelist(struct nodelist *lp)
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{
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while (lp) {
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funcblocksize += ALIGN(sizeof(struct nodelist));
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calcsize(lp->n);
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lp = lp->next;
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}
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}
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STATIC union node *
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copynode(union node *n)
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{
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union node *new;
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%COPY
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return new;
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}
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STATIC struct nodelist *
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copynodelist(struct nodelist *lp)
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{
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struct nodelist *start;
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struct nodelist **lpp;
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lpp = &start;
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while (lp) {
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*lpp = funcblock;
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funcblock = (char *)funcblock + ALIGN(sizeof(struct nodelist));
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(*lpp)->n = copynode(lp->n);
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lp = lp->next;
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lpp = &(*lpp)->next;
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}
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*lpp = NULL;
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return start;
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}
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STATIC char *
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nodesavestr(char *s)
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{
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char *p = s;
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char *q = funcstring;
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char *rtn = funcstring;
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while ((*q++ = *p++) != '\0')
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continue;
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funcstring = q;
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return rtn;
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}
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void
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reffunc(struct funcdef *fn)
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{
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if (fn)
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fn->refcount++;
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}
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/*
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* Decrement the reference count of a function definition, freeing it
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* if it falls to 0.
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*/
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void
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unreffunc(struct funcdef *fn)
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{
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if (fn) {
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fn->refcount--;
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if (fn->refcount > 0)
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return;
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ckfree(fn);
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}
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}
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