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freebsd/usr.bin/window/parser4.c
Rodney W. Grimes 9b50d90275 BSD 4.4 Lite Usr.bin Sources
1994-05-27 12:33:43 +00:00

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