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1.5 ! millert 1: /* $OpenBSD: parser3.c,v 1.4 2001/11/19 19:02:18 mpech Exp $ */
1.1 deraadt 2: /* $NetBSD: parser3.c,v 1.3 1995/09/28 10:34:33 tls Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Edward Wang at The University of California, Berkeley.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.5 ! millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)parser3.c 8.1 (Berkeley) 6/6/93";
39: #else
1.5 ! millert 40: static char rcsid[] = "$OpenBSD: parser3.c,v 1.4 2001/11/19 19:02:18 mpech Exp $";
1.1 deraadt 41: #endif
42: #endif /* not lint */
43:
44: #include "parser.h"
45:
46: /*
47: * =
48: * ? :
49: * ||
50: * &&
51: * |
52: * ^
53: * &
54: * == !=
55: * <= >=
56: * << >>
57: * + -
58: * * / %
59: * unary - + ~ !
60: */
61: p_expr(v, flag)
1.4 mpech 62: struct value *v;
1.1 deraadt 63: char flag;
64: {
65: struct value t;
66: int ret;
67:
68: if (p_expr0(&t, flag) < 0)
69: return -1;
70:
71: if (token != T_ASSIGN) {
72: *v = t;
73: return 0;
74: }
75: switch (t.v_type) {
76: case V_NUM:
77: p_error("%d: Not a variable.", t.v_num);
78: case V_ERR:
79: t.v_str = 0;
80: break;
81: }
82: ret = p_assign(t.v_str, v, flag);
83: if (t.v_str != 0)
84: str_free(t.v_str);
85: return ret;
86: }
87:
88: /*
89: * ? :
90: */
91: p_expr0(v, flag)
1.4 mpech 92: struct value *v;
1.1 deraadt 93: char flag;
94: {
95: struct value t;
96: char true;
97:
98: if (p_expr1(v, flag) < 0)
99: return -1;
100: if (token != T_QUEST)
101: return 0;
102: switch (v->v_type) {
103: case V_NUM:
104: true = v->v_num != 0;
105: break;
106: case V_STR:
107: p_error("?: Numeric left operand required.");
108: str_free(v->v_str);
109: v->v_type = V_ERR;
110: case V_ERR:
111: flag = 0;
112: break;
113: }
114: (void) s_gettok();
115: v->v_type = V_ERR;
116: if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0)
117: return -1;
118: if (token != T_COLON) {
119: val_free(*v);
120: p_synerror();
121: return -1;
122: }
123: (void) s_gettok();
124: return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0);
125: }
126:
127: /*
128: * ||
129: */
130: p_expr1(v, flag)
1.4 mpech 131: struct value *v;
1.1 deraadt 132: char flag;
133: {
134: char true = 0;
135:
136: if (p_expr2(v, flag) < 0)
137: return -1;
138: if (token != T_OROR)
139: return 0;
140: for (;;) {
141: switch (v->v_type) {
142: case V_NUM:
143: v->v_num = true = true || v->v_num != 0;
144: break;
145: case V_STR:
146: p_error("||: Numeric operands required.");
147: str_free(v->v_str);
148: v->v_type = V_ERR;
149: case V_ERR:
150: flag = 0;
151: break;
152: }
153: if (token != T_OROR)
154: return 0;
155: (void) s_gettok();
156: if (p_expr2(v, flag && !true) < 0)
157: return -1;
158: }
159: }
160:
161: /*
162: * &&
163: */
164: p_expr2(v, flag)
1.4 mpech 165: struct value *v;
1.1 deraadt 166: char flag;
167: {
168: char true = 1;
169:
170: if (p_expr3_10(3, v, flag) < 0)
171: return -1;
172: if (token != T_ANDAND)
173: return 0;
174: for (;;) {
175: switch (v->v_type) {
176: case V_NUM:
177: v->v_num = true = true && v->v_num != 0;
178: break;
179: case V_STR:
180: p_error("&&: Numeric operands required.");
181: str_free(v->v_str);
182: v->v_type = V_ERR;
183: case V_ERR:
184: flag = 0;
185: break;
186: }
187: if (token != T_ANDAND)
188: return 0;
189: (void) s_gettok();
190: if (p_expr3_10(3, v, flag && true) < 0)
191: return -1;
192: }
193: /*NOTREACHED*/
194: }