nodes.c.pat revision 110981
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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: head/bin/sh/nodes.c.pat 110981 2003-02-16 03:28:11Z tjr $ 38 */ 39 40#include <stdlib.h> 41/* 42 * Routine for dealing with parsed shell commands. 43 */ 44 45#include "shell.h" 46#include "nodes.h" 47#include "memalloc.h" 48#include "machdep.h" 49#include "mystring.h" 50 51 52int funcblocksize; /* size of structures in function */ 53int funcstringsize; /* size of strings in node */ 54pointer funcblock; /* block to allocate function from */ 55char *funcstring; /* block to allocate strings from */ 56 57%SIZES 58 59 60STATIC void calcsize(union node *); 61STATIC void sizenodelist(struct nodelist *); 62STATIC union node *copynode(union node *); 63STATIC struct nodelist *copynodelist(struct nodelist *); 64STATIC char *nodesavestr(char *); 65 66 67 68/* 69 * Make a copy of a parse tree. 70 */ 71 72union node * 73copyfunc(union node *n) 74{ 75 if (n == NULL) 76 return NULL; 77 funcblocksize = 0; 78 funcstringsize = 0; 79 calcsize(n); 80 funcblock = ckmalloc(funcblocksize + funcstringsize); 81 funcstring = (char *)funcblock + funcblocksize; 82 return copynode(n); 83} 84 85 86 87STATIC void 88calcsize(union node *n) 89{ 90 %CALCSIZE 91} 92 93 94 95STATIC void 96sizenodelist(struct nodelist *lp) 97{ 98 while (lp) { 99 funcblocksize += ALIGN(sizeof(struct nodelist)); 100 calcsize(lp->n); 101 lp = lp->next; 102 } 103} 104 105 106 107STATIC union node * 108copynode(union node *n) 109{ 110 union node *new; 111 112 %COPY 113 return new; 114} 115 116 117STATIC struct nodelist * 118copynodelist(struct nodelist *lp) 119{ 120 struct nodelist *start; 121 struct nodelist **lpp; 122 123 lpp = &start; 124 while (lp) { 125 *lpp = funcblock; 126 funcblock = (char *)funcblock + ALIGN(sizeof(struct nodelist)); 127 (*lpp)->n = copynode(lp->n); 128 lp = lp->next; 129 lpp = &(*lpp)->next; 130 } 131 *lpp = NULL; 132 return start; 133} 134 135 136 137STATIC char * 138nodesavestr(char *s) 139{ 140 char *p = s; 141 char *q = funcstring; 142 char *rtn = funcstring; 143 144 while ((*q++ = *p++) != '\0') 145 continue; 146 funcstring = q; 147 return rtn; 148} 149 150 151 152/* 153 * Free a parse tree. 154 */ 155 156void 157freefunc(union node *n) 158{ 159 if (n) 160 ckfree(n); 161} 162