1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*-
* 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: releng/12.0/bin/sh/nodes.c.pat 314436 2017-02-28 23:42:47Z imp $
*/
#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);
}
}
|