192 lines
4.2 KiB
C
192 lines
4.2 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[] = "@(#)parser3.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include "parser.h"
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/*
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* =
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* ? :
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* ||
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* &&
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* |
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* ^
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* &
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* == !=
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* <= >=
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* << >>
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* + -
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* * / %
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* unary - + ~ !
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*/
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p_expr(v, flag)
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register struct value *v;
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char flag;
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{
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struct value t;
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int ret;
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if (p_expr0(&t, flag) < 0)
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return -1;
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if (token != T_ASSIGN) {
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*v = t;
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return 0;
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}
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switch (t.v_type) {
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case V_NUM:
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p_error("%d: Not a variable.", t.v_num);
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case V_ERR:
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t.v_str = 0;
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break;
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}
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ret = p_assign(t.v_str, v, flag);
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if (t.v_str != 0)
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str_free(t.v_str);
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return ret;
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}
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/*
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* ? :
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*/
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p_expr0(v, flag)
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register struct value *v;
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char flag;
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{
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struct value t;
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char true;
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if (p_expr1(v, flag) < 0)
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return -1;
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if (token != T_QUEST)
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return 0;
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switch (v->v_type) {
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case V_NUM:
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true = v->v_num != 0;
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break;
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case V_STR:
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p_error("?: Numeric left operand required.");
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str_free(v->v_str);
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v->v_type = V_ERR;
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case V_ERR:
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flag = 0;
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break;
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}
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(void) s_gettok();
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v->v_type = V_ERR;
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if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0)
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return -1;
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if (token != T_COLON) {
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val_free(*v);
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p_synerror();
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return -1;
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}
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(void) s_gettok();
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return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0);
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}
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/*
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* ||
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*/
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p_expr1(v, flag)
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register struct value *v;
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char flag;
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{
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char true = 0;
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if (p_expr2(v, flag) < 0)
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return -1;
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if (token != T_OROR)
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return 0;
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for (;;) {
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switch (v->v_type) {
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case V_NUM:
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v->v_num = true = true || v->v_num != 0;
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break;
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case V_STR:
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p_error("||: Numeric operands required.");
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str_free(v->v_str);
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v->v_type = V_ERR;
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case V_ERR:
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flag = 0;
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break;
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}
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if (token != T_OROR)
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return 0;
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(void) s_gettok();
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if (p_expr2(v, flag && !true) < 0)
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return -1;
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}
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}
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/*
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* &&
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*/
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p_expr2(v, flag)
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register struct value *v;
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char flag;
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{
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char true = 1;
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if (p_expr3_10(3, v, flag) < 0)
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return -1;
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if (token != T_ANDAND)
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return 0;
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for (;;) {
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switch (v->v_type) {
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case V_NUM:
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v->v_num = true = true && v->v_num != 0;
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break;
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case V_STR:
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p_error("&&: Numeric operands required.");
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str_free(v->v_str);
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v->v_type = V_ERR;
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case V_ERR:
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flag = 0;
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break;
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}
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if (token != T_ANDAND)
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return 0;
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(void) s_gettok();
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if (p_expr3_10(3, v, flag && true) < 0)
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return -1;
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}
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/*NOTREACHED*/
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}
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