158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include "value.h"
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#include "var.h"
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#include "string.h"
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char *malloc();
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struct var *
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var_set1(head, name, v)
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struct var **head;
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char *name;
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struct value *v;
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{
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register struct var **p;
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register struct var *r;
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struct value val;
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/* do this first, easier to recover */
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val = *v;
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if (val.v_type == V_STR && val.v_str != 0 &&
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(val.v_str = str_cpy(val.v_str)) == 0)
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return 0;
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if (*(p = var_lookup1(head, name)) == 0) {
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r = (struct var *) malloc(sizeof (struct var));
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if (r == 0) {
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val_free(val);
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return 0;
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}
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if ((r->r_name = str_cpy(name)) == 0) {
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val_free(val);
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free((char *) r);
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return 0;
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}
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r->r_left = r->r_right = 0;
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*p = r;
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} else {
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r = *p;
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val_free(r->r_val);
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}
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r->r_val = val;
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return r;
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}
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struct var *
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var_setstr1(head, name, str)
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struct var **head;
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char *name;
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char *str;
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{
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struct value v;
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v.v_type = V_STR;
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v.v_str = str;
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return var_set1(head, name, &v);
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}
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struct var *
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var_setnum1(head, name, num)
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struct var **head;
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char *name;
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int num;
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{
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struct value v;
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v.v_type = V_NUM;
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v.v_num = num;
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return var_set1(head, name, &v);
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}
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var_unset1(head, name)
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struct var **head;
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char *name;
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{
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register struct var **p;
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register struct var *r;
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if (*(p = var_lookup1(head, name)) == 0)
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return -1;
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r = *p;
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*p = r->r_left;
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while (*p != 0)
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p = &(*p)->r_right;
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*p = r->r_right;
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val_free(r->r_val);
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str_free(r->r_name);
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free((char *) r);
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return 0;
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}
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struct var **
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var_lookup1(p, name)
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register struct var **p;
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register char *name;
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{
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register cmp;
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while (*p != 0) {
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if ((cmp = strcmp(name, (*p)->r_name)) < 0)
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p = &(*p)->r_left;
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else if (cmp > 0)
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p = &(*p)->r_right;
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else
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break;
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}
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return p;
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}
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var_walk1(r, func, a)
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register struct var *r;
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int (*func)();
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{
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if (r == 0)
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return 0;
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if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
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|| var_walk1(r->r_right, func, a) < 0)
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return -1;
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return 0;
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}
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