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32 * @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95
36 #include <sys/param.h>
40 * Routine for dealing with parsed shell commands.
50 int blocksize; /* size of structures in function */
51 int stringsize; /* size of strings in node */
54 struct nodecopystate {
55 pointer block; /* block to allocate function from */
56 char *string; /* block to allocate strings from */
62 static void calcsize(union node *, struct nodesize *);
63 static void sizenodelist(struct nodelist *, struct nodesize *);
64 static union node *copynode(union node *, struct nodecopystate *);
65 static struct nodelist *copynodelist(struct nodelist *, struct nodecopystate *);
66 static char *nodesavestr(const char *, struct nodecopystate *);
70 unsigned int refcount;
75 * Make a copy of a parse tree.
79 copyfunc(union node *n)
82 struct nodecopystate st;
87 sz.blocksize = offsetof(struct funcdef, n);
90 fn = ckmalloc(sz.blocksize + sz.stringsize);
92 st.block = (char *)fn + offsetof(struct funcdef, n);
93 st.string = (char *)fn + sz.blocksize;
100 getfuncnode(struct funcdef *fn)
102 return fn == NULL ? NULL : &fn->n;
107 calcsize(union node *n, struct nodesize *result)
115 sizenodelist(struct nodelist *lp, struct nodesize *result)
118 result->blocksize += ALIGN(sizeof(struct nodelist));
119 calcsize(lp->n, result);
127 copynode(union node *n, struct nodecopystate *state)
136 static struct nodelist *
137 copynodelist(struct nodelist *lp, struct nodecopystate *state)
139 struct nodelist *start;
140 struct nodelist **lpp;
145 state->block = (char *)state->block +
146 ALIGN(sizeof(struct nodelist));
147 (*lpp)->n = copynode(lp->n, state);
158 nodesavestr(const char *s, struct nodecopystate *state)
161 char *q = state->string;
162 char *rtn = state->string;
164 while ((*q++ = *p++) != '\0')
172 reffunc(struct funcdef *fn)
180 * Decrement the reference count of a function definition, freeing it
185 unreffunc(struct funcdef *fn)
189 if (fn->refcount > 0)