298 lines
6.2 KiB
C
298 lines
6.2 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[] = "@(#)parser4.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <string.h>
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#include "parser.h"
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/*
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* | 3
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* ^ 4
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* & 5
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* == != 6
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* < <= > >= 7
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* << >> 8
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* + - 9
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* * / % 10
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*/
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p_expr3_10(level, 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 l, r;
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int op;
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char *opname;
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if ((level == 10 ? p_expr11(v, flag)
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: p_expr3_10(level + 1, v, flag)) < 0)
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return -1;
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for (;;) {
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switch (level) {
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case 3:
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if (token != T_OR)
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return 0;
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opname = "|";
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break;
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case 4:
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if (token != T_XOR)
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return 0;
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opname = "^";
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break;
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case 5:
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if (token != T_AND)
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return 0;
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opname = "&";
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break;
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case 6:
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if (token == T_EQ)
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opname = "==";
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else if (token == T_NE)
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opname = "!=";
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else
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return 0;
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break;
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case 7:
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switch (token) {
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case T_LT:
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opname = "<";
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break;
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case T_LE:
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opname = "<=";
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break;
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case T_GT:
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opname = ">";
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break;
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case T_GE:
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opname = ">=";
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break;
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default:
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return 0;
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}
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break;
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case 8:
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if (token == T_LS)
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opname = "<<";
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else if (token == T_RS)
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opname = ">>";
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else
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return 0;
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break;
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case 9:
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if (token == T_PLUS)
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opname = "+";
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else if (token == T_MINUS)
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opname = "-";
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else
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return 0;
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break;
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case 10:
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switch (token) {
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case T_MUL:
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opname = "*";
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break;
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case T_DIV:
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opname = "/";
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break;
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case T_MOD:
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opname = "%";
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break;
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default:
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return 0;
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}
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break;
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}
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l = *v;
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if (l.v_type == V_ERR)
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flag = 0;
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op = token;
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(void) s_gettok();
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if ((level == 10 ? p_expr11(&r, flag)
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: p_expr3_10(level + 1, &r, flag)) < 0) {
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p_synerror();
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val_free(l);
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return -1;
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}
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if (r.v_type == V_ERR)
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flag = 0;
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else switch (op) {
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case T_EQ:
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case T_NE:
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case T_LT:
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case T_LE:
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case T_GT:
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case T_GE:
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case T_PLUS:
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if (l.v_type == V_STR) {
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if (r.v_type == V_NUM)
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if (p_convstr(&r) < 0)
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flag = 0;
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} else
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if (r.v_type == V_STR)
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if (p_convstr(&l) < 0)
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flag = 0;
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break;
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case T_LS:
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case T_RS:
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if (r.v_type == V_STR) {
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char *p = r.v_str;
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r.v_type = V_NUM;
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r.v_num = strlen(p);
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str_free(p);
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}
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break;
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case T_OR:
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case T_XOR:
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case T_AND:
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case T_MINUS:
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case T_MUL:
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case T_DIV:
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case T_MOD:
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default:
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if (l.v_type == V_STR || r.v_type == V_STR) {
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p_error("%s: Numeric operands required.",
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opname);
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flag = 0;
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}
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}
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if (!flag) {
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val_free(l);
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val_free(r);
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v->v_type = V_ERR;
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if (p_abort())
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return -1;
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continue;
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}
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v->v_type = V_NUM;
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switch (op) {
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case T_EQ:
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case T_NE:
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case T_LT:
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case T_LE:
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case T_GT:
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case T_GE:
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if (l.v_type == V_STR) {
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int tmp = strcmp(l.v_str, r.v_str);
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str_free(l.v_str);
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str_free(r.v_str);
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l.v_type = V_NUM;
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l.v_num = tmp;
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r.v_type = V_NUM;
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r.v_num = 0;
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}
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break;
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}
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switch (op) {
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case T_OR:
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v->v_num = l.v_num | r.v_num;
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break;
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case T_XOR:
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v->v_num = l.v_num ^ r.v_num;
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break;
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case T_AND:
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v->v_num = l.v_num & r.v_num;
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break;
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case T_EQ:
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v->v_num = l.v_num == r.v_num;
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break;
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case T_NE:
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v->v_num = l.v_num != r.v_num;
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break;
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case T_LT:
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v->v_num = l.v_num < r.v_num;
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break;
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case T_LE:
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v->v_num = l.v_num <= r.v_num;
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break;
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case T_GT:
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v->v_num = l.v_num > r.v_num;
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break;
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case T_GE:
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v->v_num = l.v_num >= r.v_num;
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break;
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case T_LS:
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if (l.v_type == V_STR) {
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int i;
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if ((i = strlen(l.v_str)) > r.v_num)
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i = r.v_num;
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v->v_str = str_ncpy(l.v_str, i);
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v->v_type = V_STR;
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} else
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v->v_num = l.v_num << r.v_num;
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break;
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case T_RS:
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if (l.v_type == V_STR) {
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int i;
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if ((i = strlen(l.v_str)) > r.v_num)
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i -= r.v_num;
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else
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i = 0;
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v->v_str = str_cpy(l.v_str + i);
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v->v_type = V_STR;
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} else
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v->v_num = l.v_num >> r.v_num;
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break;
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case T_PLUS:
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if (l.v_type == V_STR) {
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v->v_str = str_cat(l.v_str, r.v_str);
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v->v_type = V_STR;
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} else
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v->v_num = l.v_num + r.v_num;
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break;
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case T_MINUS:
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v->v_num = l.v_num - r.v_num;
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break;
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case T_MUL:
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v->v_num = l.v_num * r.v_num;
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break;
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case T_DIV:
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v->v_num = l.v_num / r.v_num;
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break;
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case T_MOD:
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v->v_num = l.v_num % r.v_num;
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break;
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}
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val_free(l);
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val_free(r);
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}
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/*NOTREACHED*/
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}
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