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202 lines
4.6 KiB
C
202 lines
4.6 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[] = "@(#)parser5.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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#include "var.h"
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/*
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* unary $ $? + - ! ~
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*/
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p_expr11(v, flag)
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register struct value *v;
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char flag;
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{
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int op;
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char *opname;
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switch (token) {
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case T_DOLLAR:
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opname = "$";
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break;
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case T_DQ:
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opname = "$?";
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break;
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case T_PLUS:
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opname = "unary +";
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break;
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case T_MINUS:
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opname = "unary -";
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break;
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case T_NOT:
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opname = "!";
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break;
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case T_COMP:
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opname = "~";
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break;
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default:
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return p_expr12(v, flag);
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}
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op = token;
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(void) s_gettok();
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if (p_expr11(v, flag) < 0)
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return -1;
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switch (v->v_type) {
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case V_NUM:
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break;
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case V_STR:
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switch (op) {
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case T_MINUS:
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case T_NOT:
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case T_COMP:
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p_error("%s: Numeric operand required.", opname);
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str_free(v->v_str);
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v->v_type = V_ERR;
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return 0;
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}
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break;
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case V_ERR:
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return 0;
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}
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switch (op) {
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case T_DOLLAR:
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case T_DQ:
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if (v->v_type == V_NUM) {
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int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
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v->v_num > 0 && v->v_num <= cx.x_narg;
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if (op == T_DQ)
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v->v_num = tmp;
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else if (tmp)
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*v = cx.x_arg[v->v_num - 1];
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else {
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p_error("%d: No such argument.", v->v_num);
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v->v_type = V_ERR;
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}
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} else {
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char *name = v->v_str;
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struct var *r = var_lookup(name);
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if (op == T_DQ) {
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v->v_type = V_NUM;
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v->v_num = r != 0;
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} else if (r != 0)
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*v = r->r_val;
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else {
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p_error("%s: Undefined variable.", name);
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v->v_type = V_ERR;
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}
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str_free(name);
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}
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if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
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p_memerror();
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return -1;
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}
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break;
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case T_MINUS:
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v->v_num = - v->v_num;
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break;
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case T_NOT:
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v->v_num = ! v->v_num;
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break;
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case T_COMP:
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v->v_num = ~ v->v_num;
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break;
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}
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return 0;
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}
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/*
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* string, number, ( expr )
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* Plus function calls.
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*
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* Always return v_type == V_ERR when flag == 0.
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*/
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p_expr12(v, flag)
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register struct value *v;
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char flag;
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{
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v->v_type = V_ERR;
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switch (token) {
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case T_NUM:
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if (flag) {
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v->v_type = V_NUM;
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v->v_num = token_num;
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}
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(void) s_gettok();
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break;
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case T_STR:
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if (flag) {
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v->v_type = V_STR;
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v->v_str = token_str;
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} else
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str_free(token_str);
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(void) s_gettok();
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break;
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case T_LP:
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(void) s_gettok();
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if (p_expr(v, flag) < 0) {
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p_synerror();
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return -1;
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}
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if (token != T_RP) {
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p_synerror();
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val_free(*v);
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return -1;
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}
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(void) s_gettok();
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break;
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default:
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return -1;
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}
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while (token == T_LP) {
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char *cmd;
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if (p_convstr(v) < 0)
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return -1;
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cmd = v->v_type == V_STR ? v->v_str : 0;
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if (p_function(cmd, v, flag) < 0) {
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if (cmd)
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str_free(cmd);
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return -1;
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}
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if (cmd)
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str_free(cmd);
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}
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return 0;
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}
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