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1.3 ! downsj 1: /* $OpenBSD$ */
1.1 deraadt 2: /* $NetBSD: parser1.c,v 1.3 1995/09/28 10:34:31 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.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: #if 0
42: static char sccsid[] = "@(#)parser1.c 8.1 (Berkeley) 6/6/93";
43: #else
1.3 ! downsj 44: static char rcsid[] = "$OpenBSD$";
1.1 deraadt 45: #endif
46: #endif /* not lint */
47:
48: #include "parser.h"
49:
50: p_start()
51: {
52: char flag = 1;
53:
54: (void) s_gettok();
55: for (;;) {
56: p_statementlist(flag);
57: if (token == T_EOF || p_abort())
58: break;
59: flag = 0;
60: p_synerror();
61: while (token != T_EOL && token != T_EOF) {
62: if (token == T_STR)
63: str_free(token_str);
64: (void) s_gettok();
65: }
66: if (token == T_EOL)
67: (void) s_gettok();
68: p_clearerr();
69: }
70: }
71:
72: p_statementlist(flag)
73: char flag;
74: {
75: for (; p_statement(flag) >= 0; p_clearerr())
76: ;
77: }
78:
79: p_statement(flag)
80: char flag;
81: {
82: switch (token) {
83: case T_EOL:
84: (void) s_gettok();
85: return 0;
86: case T_IF:
87: return p_if(flag);
88: default:
89: return p_expression(flag);
90: }
91: }
92:
93: p_if(flag)
94: char flag;
95: {
96: struct value t;
97: char true = 0;
98:
99: top:
100: (void) s_gettok();
101:
102: if (p_expr(&t, flag) < 0) {
103: p_synerror();
104: return -1;
105: }
106: switch (t.v_type) {
107: case V_NUM:
108: true = !true && t.v_num != 0;
109: break;
110: case V_STR:
111: p_error("if: Numeric value required.");
112: str_free(t.v_str);
113: case V_ERR:
114: flag = 0;
115: break;
116: }
117:
118: if (token != T_THEN) {
119: p_synerror();
120: return -1;
121: }
122:
123: (void) s_gettok();
124: p_statementlist(flag && true);
125: if (p_erred())
126: return -1;
127:
128: if (token == T_ELSIF)
129: goto top;
130:
131: if (token == T_ELSE) {
132: (void) s_gettok();
133: p_statementlist(flag && !true);
134: if (p_erred())
135: return -1;
136: }
137:
138: if (token == T_ENDIF) {
139: (void) s_gettok();
140: return 0;
141: }
142:
143: p_synerror();
144: return -1;
145: }
146:
147: p_expression(flag)
148: char flag;
149: {
150: struct value t;
151: char *cmd;
152: int p_function(), p_assign();
153:
154: switch (token) {
155: case T_NUM:
156: t.v_type = V_NUM;
157: t.v_num = token_num;
158: (void) s_gettok();
159: break;
160: case T_STR:
161: t.v_type = V_STR;
162: t.v_str = token_str;
163: (void) s_gettok();
164: break;
165: default:
166: if (p_expr(&t, flag) < 0)
167: return -1;
168: if (token == T_EOF) {
169: val_free(t);
170: return 0;
171: }
172: }
173: if (token != T_ASSIGN && p_convstr(&t) < 0)
174: return -1;
175: cmd = t.v_type == V_STR ? t.v_str : 0;
176: if ((*(token == T_ASSIGN ? p_assign : p_function))(cmd, &t, flag) < 0) {
177: if (cmd)
178: str_free(cmd);
179: return -1;
180: }
181: if (cmd)
182: str_free(cmd);
183: val_free(t);
184: if (token == T_EOL)
185: (void) s_gettok();
186: else if (token != T_EOF) {
187: p_synerror();
188: return -1;
189: }
190: return 0;
191: }
192:
193: p_convstr(v)
194: register struct value *v;
195: {
196: if (v->v_type != V_NUM)
197: return 0;
198: if ((v->v_str = str_itoa(v->v_num)) == 0) {
199: p_memerror();
200: v->v_type = V_ERR;
201: return -1;
202: }
203: v->v_type = V_STR;
204: return 0;
205: }
206:
207: p_synerror()
208: {
209: if (!cx.x_synerred) {
210: cx.x_synerred = cx.x_erred = 1;
211: error("Syntax error.");
212: }
213: }
214:
215: /*VARARGS1*/
216: p_error(msg, a, b, c)
217: char *msg;
218: {
219: if (!cx.x_erred) {
220: cx.x_erred = 1;
221: error(msg, a, b, c);
222: }
223: }
224:
225: p_memerror()
226: {
227: cx.x_erred = cx.x_abort = 1;
228: error("Out of memory.");
229: }