value.c revision 330897 
1/*	$OpenBSD: value.c,v 1.14 2006/03/17 22:02:58 moritz Exp $	*/
2/*	$NetBSD: value.c,v 1.6 1997/02/11 09:24:09 mrg Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (c) 1983, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/usr.bin/tip/tip/value.c 330897 2018-03-14 03:19:51Z eadler $");
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)value.c	8.1 (Berkeley) 6/6/93";
41static const char rcsid[] = "$OpenBSD: value.c,v 1.14 2006/03/17 22:02:58 moritz Exp $";
42#endif
43#endif /* not lint */
44
45#include "tip.h"
46
47#define MIDDLE	35
48
49static value_t *vlookup(char *);
50static void vassign(value_t *, char *);
51static void vtoken(char *);
52static void vprint(value_t *);
53static int vaccess(unsigned int, unsigned int);
54static char *vinterp(char *, int);
55
56static size_t col = 0;
57
58/*
59 * Variable manipulation
60 */
61void
62vinit(void)
63{
64	char file[FILENAME_MAX], *cp;
65	value_t *p;
66	FILE *fp;
67
68	for (p = vtable; p->v_name != NULL; p++) {
69		if (p->v_type&ENVIRON)
70			if ((cp = getenv(p->v_name)))
71				p->v_value = cp;
72		if (p->v_type&IREMOTE)
73			setnumber(p->v_value, *address(p->v_value));
74	}
75	/*
76	 * Read the .tiprc file in the HOME directory
77	 *  for sets
78	 */
79	cp = value(HOME);
80	if (cp == NULL) {
81		(void)fprintf(stderr,
82		    "$HOME not set. Skipping check for ~/.tiprc\n");
83	} else if (strlen(cp) + sizeof("/.tiprc") > sizeof(file)) {
84		(void)fprintf(stderr, "Home directory path too long: %s\n",
85		    value(HOME));
86	} else {
87		snprintf(file, sizeof file, "%s/.tiprc", value(HOME));
88		if ((fp = fopen(file, "r")) != NULL) {
89			char *tp;
90
91			while (fgets(file, sizeof(file)-1, fp) != NULL) {
92				if (vflag)
93					printf("set %s", file);
94				if ((tp = strrchr(file, '\n')))
95					*tp = '\0';
96				vlex(file);
97			}
98			fclose(fp);
99		}
100	}
101	/*
102	 * To allow definition of exception prior to fork
103	 */
104	vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
105}
106
107/*VARARGS1*/
108static void
109vassign(value_t *p, char *v)
110{
111	if (!vaccess(p->v_access, WRITE)) {
112		printf("access denied\r\n");
113		return;
114	}
115
116	switch (p->v_type&TMASK) {
117	case STRING:
118		if (p->v_value && equal(p->v_value, v))
119			return;
120		if (!(p->v_type&(ENVIRON|INIT)))
121			free(p->v_value);
122		if ((p->v_value = strdup(v)) == NOSTR) {
123			printf("out of core\r\n");
124			return;
125		}
126		p->v_type &= ~(ENVIRON|INIT);
127		break;
128	case NUMBER:
129		if (number(p->v_value) == number(v))
130			return;
131		setnumber(p->v_value, number(v));
132		break;
133	case BOOL:
134		if (boolean(p->v_value) == (*v != '!'))
135			return;
136		setboolean(p->v_value, (*v != '!'));
137		break;
138	case CHAR:
139		if (character(p->v_value) == *v)
140			return;
141		setcharacter(p->v_value, *v);
142	}
143	p->v_access |= CHANGED;
144}
145
146void
147vlex(char *s)
148{
149	value_t *p;
150	char *cp;
151
152	if (equal(s, "all")) {
153		for (p = vtable; p->v_name; p++)
154			if (vaccess(p->v_access, READ))
155				vprint(p);
156	} else {
157		do {
158			if ((cp = vinterp(s, ' ')))
159				cp++;
160			vtoken(s);
161			s = cp;
162		} while (s);
163	}
164	if (col > 0) {
165		printf("\r\n");
166		col = 0;
167	}
168}
169
170static void
171vtoken(char *s)
172{
173	value_t *p;
174	char *cp;
175
176	if ((cp = strchr(s, '='))) {
177		*cp = '\0';
178		if ((p = vlookup(s))) {
179			cp++;
180			if (p->v_type&NUMBER)
181				vassign(p, (char *)(intptr_t)atoi(cp));
182			else {
183				if (strcmp(s, "record") == 0)
184					cp = expand(cp);
185				vassign(p, cp);
186			}
187			return;
188		}
189	} else if ((cp = strchr(s, '?'))) {
190		*cp = '\0';
191		if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
192			vprint(p);
193			return;
194		}
195	} else {
196		if (*s != '!')
197			p = vlookup(s);
198		else
199			p = vlookup(s+1);
200		if (p != NOVAL) {
201			vassign(p, s);
202			return;
203		}
204	}
205	printf("%s: unknown variable\r\n", s);
206}
207
208static void
209vprint(value_t *p)
210{
211	char *cp;
212
213	if (col > 0 && col < MIDDLE)
214		while (col++ < MIDDLE)
215			putchar(' ');
216	col += size(p->v_name);
217	switch (p->v_type&TMASK) {
218
219	case BOOL:
220		if (boolean(p->v_value) == FALSE) {
221			col++;
222			putchar('!');
223		}
224		printf("%s", p->v_name);
225		break;
226
227	case STRING:
228		printf("%s=", p->v_name);
229		col++;
230		if (p->v_value) {
231			cp = interp(p->v_value);
232			col += size(cp);
233			printf("%s", cp);
234		}
235		break;
236
237	case NUMBER:
238		col += 6;
239		printf("%s=%-5ld", p->v_name, number(p->v_value));
240		break;
241
242	case CHAR:
243		printf("%s=", p->v_name);
244		col++;
245		if (p->v_value) {
246			cp = ctrl(character(p->v_value));
247			col += size(cp);
248			printf("%s", cp);
249		}
250		break;
251	}
252	if (col >= MIDDLE) {
253		col = 0;
254		printf("\r\n");
255		return;
256	}
257}
258
259static int
260vaccess(unsigned int mode, unsigned int rw)
261{
262	if (mode & (rw<<PUBLIC))
263		return (1);
264	if (mode & (rw<<PRIVATE))
265		return (1);
266	return ((mode & (rw<<ROOT)) && getuid() == 0);
267}
268
269static value_t *
270vlookup(char *s)
271{
272	value_t *p;
273
274	for (p = vtable; p->v_name; p++)
275		if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
276			return (p);
277	return (NULL);
278}
279
280static char *
281vinterp(char *s, int stop)
282{
283	char *p = s, c;
284	int num;
285
286	while ((c = *s++) && c != stop) {
287		switch (c) {
288
289		case '^':
290			if (*s)
291				*p++ = *s++ - 0100;
292			else
293				*p++ = c;
294			break;
295
296		case '\\':
297			num = 0;
298			c = *s++;
299			if (c >= '0' && c <= '7')
300				num = (num<<3)+(c-'0');
301			else {
302				char *q = "n\nr\rt\tb\bf\f";
303
304				for (; *q; q++)
305					if (c == *q++) {
306						*p++ = *q;
307						goto cont;
308					}
309				*p++ = c;
310			cont:
311				break;
312			}
313			if ((c = *s++) >= '0' && c <= '7') {
314				num = (num<<3)+(c-'0');
315				if ((c = *s++) >= '0' && c <= '7')
316					num = (num<<3)+(c-'0');
317				else
318					s--;
319			} else
320				s--;
321			*p++ = num;
322			break;
323
324		default:
325			*p++ = c;
326		}
327	}
328	*p = '\0';
329	return (c == stop ? s-1 : NULL);
330}
331
332/*
333 * assign variable s with value v (for NUMBER or STRING or CHAR types)
334 */
335int
336vstring(char *s, char *v)
337{
338	value_t *p;
339
340	p = vlookup(s);
341	if (p == 0)
342		return (1);
343	if (p->v_type&NUMBER)
344		vassign(p, (char *)(intptr_t)atoi(v));
345	else {
346		if (strcmp(s, "record") == 0)
347			v = expand(v);
348		vassign(p, v);
349	}
350	return (0);
351}
352