1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)value.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/tip/tip/value.c,v 1.5.2.1 2000/07/01 12:24:23 ps Exp $
31 */
32
33 #include "tip.h"
34
35 #define MIDDLE 35
36
37 static value_t *vlookup(char *);
38 int vstring(char *, char *);
39 void vlex(char *);
40 void vassign(value_t *, char *);
41
42 static int col = 0;
43
44 /*
45 * Variable manipulation
46 */
47 void
vinit(void)48 vinit(void)
49 {
50 value_t *p;
51 char *cp;
52 FILE *f;
53 char file[256];
54
55 for (p = vtable; p->v_name != NULL; p++) {
56 if (p->v_type&ENVIRON)
57 if ((cp = getenv(p->v_name)))
58 p->v_value = cp;
59 if (p->v_type&IREMOTE) {
60 if (p->v_type&STRING)
61 p->v_value = *(char **) address(p->v_value);
62 else
63 number(p->v_value) = *address(p->v_value);
64 }
65 }
66 /*
67 * Read the .tiprc file in the HOME directory
68 * for sets
69 */
70 strcpy(file, value(HOME));
71 strcat(file, "/.tiprc");
72 if ((f = fopen(file, "r")) != NULL) {
73 char *tp;
74
75 while (fgets(file, sizeof(file)-1, f) != NULL) {
76 if (vflag)
77 printf("set %s", file);
78 if ((tp = rindex(file, '\n')))
79 *tp = '\0';
80 vlex(file);
81 }
82 fclose(f);
83 }
84 /*
85 * To allow definition of exception prior to fork
86 */
87 vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
88 }
89
90 static int vaccess(unsigned, unsigned);
91
92 /*VARARGS1*/
93 void
vassign(value_t * p,char * v)94 vassign(value_t *p, char *v)
95 {
96
97 if (!vaccess(p->v_access, WRITE)) {
98 printf("access denied\r\n");
99 return;
100 }
101 switch (p->v_type&TMASK) {
102
103 case STRING:
104 if (p->v_value && equal(p->v_value, v))
105 return;
106 if (!(p->v_type&(ENVIRON|INIT)))
107 free(p->v_value);
108 if ((p->v_value = malloc(size(v)+1)) == NULL) {
109 printf("out of core\r\n");
110 return;
111 }
112 p->v_type &= ~(ENVIRON|INIT);
113 strcpy(p->v_value, v);
114 break;
115
116 case NUMBER:
117 if (number(p->v_value) == number(v))
118 return;
119 number(p->v_value) = number(v);
120 break;
121
122 case BOOL:
123 if (boolean(p->v_value) == (*v != '!'))
124 return;
125 boolean(p->v_value) = (*v != '!');
126 break;
127
128 case CHAR:
129 if (character(p->v_value) == *v)
130 return;
131 character(p->v_value) = *v;
132 }
133 p->v_access |= CHANGED;
134 }
135
136 static void vprint(value_t *);
137 static void vtoken(char *);
138
139 void
vlex(char * s)140 vlex(char *s)
141 {
142 value_t *p;
143
144 if (equal(s, "all")) {
145 for (p = vtable; p->v_name; p++)
146 if (vaccess(p->v_access, READ))
147 vprint(p);
148 } else {
149 char *cp;
150
151 do {
152 if ((cp = vinterp(s, ' ')))
153 cp++;
154 vtoken(s);
155 s = cp;
156 } while (s);
157 }
158 if (col > 0) {
159 printf("\r\n");
160 col = 0;
161 }
162 }
163
164 static void
vtoken(char * s)165 vtoken(char *s)
166 {
167 value_t *p;
168 char *cp;
169
170 if ((cp = index(s, '='))) {
171 *cp = '\0';
172 if ((p = vlookup(s))) {
173 cp++;
174 if (p->v_type&NUMBER)
175 vassign(p, (char *)(intptr_t)atoi(cp));
176 else {
177 if (strcmp(s, "record") == 0)
178 cp = expand(cp);
179 vassign(p, cp);
180 }
181 return;
182 }
183 } else if ((cp = index(s, '?'))) {
184 *cp = '\0';
185 if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
186 vprint(p);
187 return;
188 }
189 } else {
190 if (*s != '!')
191 p = vlookup(s);
192 else
193 p = vlookup(s+1);
194 if (p != NULL) {
195 vassign(p, s);
196 return;
197 }
198 }
199 printf("%s: unknown variable\r\n", s);
200 }
201
202 static void
vprint(value_t * p)203 vprint(value_t *p)
204 {
205 char *cp;
206
207 if (col > 0 && col < MIDDLE)
208 while (col++ < MIDDLE)
209 putchar(' ');
210 col += size(p->v_name);
211 switch (p->v_type&TMASK) {
212
213 case BOOL:
214 if (boolean(p->v_value) == FALSE) {
215 col++;
216 putchar('!');
217 }
218 printf("%s", p->v_name);
219 break;
220
221 case STRING:
222 printf("%s=", p->v_name);
223 col++;
224 if (p->v_value) {
225 cp = interp(p->v_value);
226 col += size(cp);
227 printf("%s", cp);
228 }
229 break;
230
231 case NUMBER:
232 col += 6;
233 printf("%s=%-5d", p->v_name, number(p->v_value));
234 break;
235
236 case CHAR:
237 printf("%s=", p->v_name);
238 col++;
239 if (p->v_value) {
240 cp = ctrl(character(p->v_value));
241 col += size(cp);
242 printf("%s", cp);
243 }
244 break;
245 }
246 if (col >= MIDDLE) {
247 col = 0;
248 printf("\r\n");
249 return;
250 }
251 }
252
253
254 static int
vaccess(unsigned mode,unsigned rw)255 vaccess(unsigned mode, unsigned rw)
256 {
257 if (mode & (rw<<PUBLIC))
258 return (1);
259 if (mode & (rw<<PRIVATE))
260 return (1);
261 return ((mode & (rw<<ROOT)) && getuid() == 0);
262 }
263
264 static value_t *
vlookup(char * s)265 vlookup(char *s)
266 {
267 value_t *p;
268
269 for (p = vtable; p->v_name; p++)
270 if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
271 return (p);
272 return (NULL);
273 }
274
275 char *
vinterp(char * s,char stop)276 vinterp(char *s, char stop)
277 {
278 char *p = s, c;
279 int num;
280
281 while ((c = *s++) && c != stop)
282 switch (c) {
283
284 case '^':
285 if (*s)
286 *p++ = *s++ - 0100;
287 else
288 *p++ = c;
289 break;
290
291 case '\\':
292 num = 0;
293 c = *s++;
294 if (c >= '0' && c <= '7')
295 num = (num<<3)+(c-'0');
296 else {
297 char *q = "n\nr\rt\tb\bf\f";
298
299 for (; *q; q++)
300 if (c == *q++) {
301 *p++ = *q;
302 goto cont;
303 }
304 *p++ = c;
305 cont:
306 break;
307 }
308 if ((c = *s++) >= '0' && c <= '7') {
309 num = (num<<3)+(c-'0');
310 if ((c = *s++) >= '0' && c <= '7')
311 num = (num<<3)+(c-'0');
312 else
313 s--;
314 } else
315 s--;
316 *p++ = num;
317 break;
318
319 default:
320 *p++ = c;
321 }
322 *p = '\0';
323 return (c == stop ? s-1 : NULL);
324 }
325
326 /*
327 * assign variable s with value v (for NUMBER or STRING or CHAR types)
328 */
329
330 int
vstring(char * s,char * v)331 vstring(char *s, char *v)
332 {
333 value_t *p;
334
335 p = vlookup(s);
336 if (p == NULL)
337 return (1);
338 if (p->v_type&NUMBER)
339 vassign(p, (char *)(intptr_t)atoi(v));
340 else {
341 if (strcmp(s, "record") == 0)
342 v = expand(v);
343 vassign(p, v);
344 }
345 return (0);
346 }
347