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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)parser5.c 8.1 (Berkeley) 6/6/93";
static char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include "parser.h"
#include "var.h"
/*
* unary $ $? + - ! ~
*/
p_expr11(v, flag)
register struct value *v;
char flag;
{
int op;
char *opname;
switch (token) {
case T_DOLLAR:
opname = "$";
break;
case T_DQ:
opname = "$?";
break;
case T_PLUS:
opname = "unary +";
break;
case T_MINUS:
opname = "unary -";
break;
case T_NOT:
opname = "!";
break;
case T_COMP:
opname = "~";
break;
default:
return p_expr12(v, flag);
}
op = token;
(void) s_gettok();
if (p_expr11(v, flag) < 0)
return -1;
switch (v->v_type) {
case V_NUM:
break;
case V_STR:
switch (op) {
case T_MINUS:
case T_NOT:
case T_COMP:
p_error("%s: Numeric operand required.", opname);
str_free(v->v_str);
v->v_type = V_ERR;
return 0;
}
break;
case V_ERR:
return 0;
}
switch (op) {
case T_DOLLAR:
case T_DQ:
if (v->v_type == V_NUM) {
int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
v->v_num > 0 && v->v_num <= cx.x_narg;
if (op == T_DQ)
v->v_num = tmp;
else if (tmp)
*v = cx.x_arg[v->v_num - 1];
else {
p_error("%d: No such argument.", v->v_num);
v->v_type = V_ERR;
}
} else {
char *name = v->v_str;
struct var *r = var_lookup(name);
if (op == T_DQ) {
v->v_type = V_NUM;
v->v_num = r != 0;
} else if (r != 0)
*v = r->r_val;
else {
p_error("%s: Undefined variable.", name);
v->v_type = V_ERR;
}
str_free(name);
}
if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
p_memerror();
return -1;
}
break;
case T_MINUS:
v->v_num = - v->v_num;
break;
case T_NOT:
v->v_num = ! v->v_num;
break;
case T_COMP:
v->v_num = ~ v->v_num;
break;
}
return 0;
}
/*
* string, number, ( expr )
* Plus function calls.
*
* Always return v_type == V_ERR when flag == 0.
*/
p_expr12(v, flag)
register struct value *v;
char flag;
{
v->v_type = V_ERR;
switch (token) {
case T_NUM:
if (flag) {
v->v_type = V_NUM;
v->v_num = token_num;
}
(void) s_gettok();
break;
case T_STR:
if (flag) {
v->v_type = V_STR;
v->v_str = token_str;
} else
str_free(token_str);
(void) s_gettok();
break;
case T_LP:
(void) s_gettok();
if (p_expr(v, flag) < 0) {
p_synerror();
return -1;
}
if (token != T_RP) {
p_synerror();
val_free(*v);
return -1;
}
(void) s_gettok();
break;
default:
return -1;
}
while (token == T_LP) {
char *cmd;
if (p_convstr(v) < 0)
return -1;
cmd = v->v_type == V_STR ? v->v_str : 0;
if (p_function(cmd, v, flag) < 0) {
if (cmd)
str_free(cmd);
return -1;
}
if (cmd)
str_free(cmd);
}
return 0;
}
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