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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.
49 static int funcblocksize; /* size of structures in function */
50 static int funcstringsize; /* size of strings in node */
51 static pointer funcblock; /* block to allocate function from */
52 static char *funcstring; /* block to allocate strings from */
57 static void calcsize(union node *);
58 static void sizenodelist(struct nodelist *);
59 static union node *copynode(union node *);
60 static struct nodelist *copynodelist(struct nodelist *);
61 static char *nodesavestr(char *);
65 unsigned int refcount;
70 * Make a copy of a parse tree.
74 copyfunc(union node *n)
80 funcblocksize = offsetof(struct funcdef, n);
83 fn = ckmalloc(funcblocksize + funcstringsize);
85 funcblock = (char *)fn + offsetof(struct funcdef, n);
86 funcstring = (char *)fn + funcblocksize;
93 getfuncnode(struct funcdef *fn)
95 return fn == NULL ? NULL : &fn->n;
100 calcsize(union node *n)
108 sizenodelist(struct nodelist *lp)
111 funcblocksize += ALIGN(sizeof(struct nodelist));
120 copynode(union node *n)
129 static struct nodelist *
130 copynodelist(struct nodelist *lp)
132 struct nodelist *start;
133 struct nodelist **lpp;
138 funcblock = (char *)funcblock + ALIGN(sizeof(struct nodelist));
139 (*lpp)->n = copynode(lp->n);
153 char *q = funcstring;
154 char *rtn = funcstring;
156 while ((*q++ = *p++) != '\0')
164 reffunc(struct funcdef *fn)
172 * Decrement the reference count of a function definition, freeing it
177 unreffunc(struct funcdef *fn)
181 if (fn->refcount > 0)