xref: /freebsd/bin/sh/nodes.c.pat (revision 7bd6fde3) 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)nodes.c.pat	8.2 (Berkeley) 5/4/95
33 * $FreeBSD$
34 */
35
36#include <sys/param.h>
37#include <stdlib.h>
38/*
39 * Routine for dealing with parsed shell commands.
40 */
41
42#include "shell.h"
43#include "nodes.h"
44#include "memalloc.h"
45#include "mystring.h"
46
47
48STATIC int     funcblocksize;	/* size of structures in function */
49STATIC int     funcstringsize;	/* size of strings in node */
50STATIC pointer funcblock;	/* block to allocate function from */
51STATIC char   *funcstring;	/* block to allocate strings from */
52
53%SIZES
54
55
56STATIC void calcsize(union node *);
57STATIC void sizenodelist(struct nodelist *);
58STATIC union node *copynode(union node *);
59STATIC struct nodelist *copynodelist(struct nodelist *);
60STATIC char *nodesavestr(char *);
61
62
63
64/*
65 * Make a copy of a parse tree.
66 */
67
68union node *
69copyfunc(union node *n)
70{
71	if (n == NULL)
72		return NULL;
73	funcblocksize = 0;
74	funcstringsize = 0;
75	calcsize(n);
76	funcblock = ckmalloc(funcblocksize + funcstringsize);
77	funcstring = (char *)funcblock + funcblocksize;
78	return copynode(n);
79}
80
81
82
83STATIC void
84calcsize(union node *n)
85{
86	%CALCSIZE
87}
88
89
90
91STATIC void
92sizenodelist(struct nodelist *lp)
93{
94	while (lp) {
95		funcblocksize += ALIGN(sizeof(struct nodelist));
96		calcsize(lp->n);
97		lp = lp->next;
98	}
99}
100
101
102
103STATIC union node *
104copynode(union node *n)
105{
106	union node *new;
107
108	%COPY
109	return new;
110}
111
112
113STATIC struct nodelist *
114copynodelist(struct nodelist *lp)
115{
116	struct nodelist *start;
117	struct nodelist **lpp;
118
119	lpp = &start;
120	while (lp) {
121		*lpp = funcblock;
122		funcblock = (char *)funcblock + ALIGN(sizeof(struct nodelist));
123		(*lpp)->n = copynode(lp->n);
124		lp = lp->next;
125		lpp = &(*lpp)->next;
126	}
127	*lpp = NULL;
128	return start;
129}
130
131
132
133STATIC char *
134nodesavestr(char *s)
135{
136	char *p = s;
137	char *q = funcstring;
138	char   *rtn = funcstring;
139
140	while ((*q++ = *p++) != '\0')
141		continue;
142	funcstring = q;
143	return rtn;
144}
145
146
147
148/*
149 * Free a parse tree.
150 */
151
152void
153freefunc(union node *n)
154{
155	if (n)
156		ckfree(n);
157}
158