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