2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
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18 * This product includes software developed by the University of
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36 * @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95
37 * $FreeBSD: head/bin/sh/nodes.c.pat 249235 2013-04-07 16:28:36Z jilles $
40 #include <sys/param.h>
44 * Routine for dealing with parsed shell commands.
53 static int funcblocksize; /* size of structures in function */
54 static int funcstringsize; /* size of strings in node */
55 static pointer funcblock; /* block to allocate function from */
56 static char *funcstring; /* block to allocate strings from */
61 static void calcsize(union node *);
62 static void sizenodelist(struct nodelist *);
63 static union node *copynode(union node *);
64 static struct nodelist *copynodelist(struct nodelist *);
65 static char *nodesavestr(const char *);
69 unsigned int refcount;
74 * Make a copy of a parse tree.
78 copyfunc(union node *n)
84 funcblocksize = offsetof(struct funcdef, n);
87 fn = ckmalloc(funcblocksize + funcstringsize);
89 funcblock = (char *)fn + offsetof(struct funcdef, n);
90 funcstring = (char *)fn + funcblocksize;
97 getfuncnode(struct funcdef *fn)
99 return fn == NULL ? NULL : &fn->n;
104 calcsize(union node *n)
112 sizenodelist(struct nodelist *lp)
115 funcblocksize += ALIGN(sizeof(struct nodelist));
124 copynode(union node *n)
133 static struct nodelist *
134 copynodelist(struct nodelist *lp)
136 struct nodelist *start;
137 struct nodelist **lpp;
142 funcblock = (char *)funcblock + ALIGN(sizeof(struct nodelist));
143 (*lpp)->n = copynode(lp->n);
154 nodesavestr(const char *s)
157 char *q = funcstring;
158 char *rtn = funcstring;
160 while ((*q++ = *p++) != '\0')
168 reffunc(struct funcdef *fn)
176 * Decrement the reference count of a function definition, freeing it
181 unreffunc(struct funcdef *fn)
185 if (fn->refcount > 0)