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 "tip.h"
36
37#define MIDDLE	35
38
39static value_t *vlookup(char *);
40static void vassign(value_t *, char *);
41static void vtoken(char *);
42static void vprint(value_t *);
43static int vaccess(unsigned int, unsigned int);
44static char *vinterp(char *, int);
45
46static size_t col = 0;
47
48/*
49 * Variable manipulation
50 */
51void
52vinit(void)
53{
54	char file[FILENAME_MAX], *cp;
55	value_t *p;
56	FILE *fp;
57
58	for (p = vtable; p->v_name != NULL; p++) {
59		if (p->v_type&ENVIRON)
60			if ((cp = getenv(p->v_name)))
61				p->v_value = cp;
62		if (p->v_type&IREMOTE) {
63			switch (p->v_type&TMASK) {
64			case STRING:
65				p->v_value = *(char **)p->v_value;
66				break;
67			case NUMBER:
68				setnumber(p->v_value, *(long *)p->v_value);
69				break;
70			case BOOL:
71				setboolean(p->v_value, *(short *)p->v_value);
72				break;
73			case CHAR:
74				setcharacter(p->v_value, *(char *)p->v_value);
75				break;
76			}
77		}
78	}
79	/*
80	 * Read the .tiprc file in the HOME directory
81	 *  for sets
82	 */
83	cp = value(HOME);
84	if (cp == NULL) {
85		(void)fprintf(stderr,
86		    "$HOME not set. Skipping check for ~/.tiprc\n");
87	} else if (strlen(cp) + sizeof("/.tiprc") > sizeof(file)) {
88		(void)fprintf(stderr, "Home directory path too long: %s\n",
89		    value(HOME));
90	} else {
91		snprintf(file, sizeof file, "%s/.tiprc", value(HOME));
92		if ((fp = fopen(file, "r")) != NULL) {
93			char *tp;
94
95			while (fgets(file, sizeof(file)-1, fp) != NULL) {
96				if (vflag)
97					printf("set %s", file);
98				if ((tp = strrchr(file, '\n')))
99					*tp = '\0';
100				vlex(file);
101			}
102			fclose(fp);
103		}
104	}
105	/*
106	 * To allow definition of exception prior to fork
107	 */
108	vtable[EXCEPTIONS].v_access &= ~(WRITE<<PUBLIC);
109}
110
111/*VARARGS1*/
112static void
113vassign(value_t *p, char *v)
114{
115	if (!vaccess(p->v_access, WRITE)) {
116		printf("access denied\r\n");
117		return;
118	}
119
120	switch (p->v_type&TMASK) {
121	case STRING:
122		if (p->v_value && equal(p->v_value, v))
123			return;
124		if (!(p->v_type&(ENVIRON|INIT)))
125			free(p->v_value);
126		if ((p->v_value = strdup(v)) == NOSTR) {
127			printf("out of core\r\n");
128			return;
129		}
130		p->v_type &= ~(ENVIRON|INIT);
131		break;
132	case NUMBER:
133		if (number(p->v_value) == number(v))
134			return;
135		setnumber(p->v_value, number(v));
136		break;
137	case BOOL:
138		if (boolean(p->v_value) == (*v != '!'))
139			return;
140		setboolean(p->v_value, (*v != '!'));
141		break;
142	case CHAR:
143		if (character(p->v_value) == *v)
144			return;
145		setcharacter(p->v_value, *v);
146	}
147	p->v_access |= CHANGED;
148}
149
150void
151vlex(char *s)
152{
153	value_t *p;
154	char *cp;
155
156	if (equal(s, "all")) {
157		for (p = vtable; p->v_name; p++)
158			if (vaccess(p->v_access, READ))
159				vprint(p);
160	} else {
161		do {
162			if ((cp = vinterp(s, ' ')))
163				cp++;
164			vtoken(s);
165			s = cp;
166		} while (s);
167	}
168	if (col > 0) {
169		printf("\r\n");
170		col = 0;
171	}
172}
173
174static void
175vtoken(char *s)
176{
177	value_t *p;
178	char *cp;
179
180	if ((cp = strchr(s, '='))) {
181		*cp = '\0';
182		if ((p = vlookup(s))) {
183			cp++;
184			if (p->v_type&NUMBER)
185				vassign(p, (char *)(intptr_t)atoi(cp));
186			else {
187				if (strcmp(s, "record") == 0)
188					cp = expand(cp);
189				vassign(p, cp);
190			}
191			return;
192		}
193	} else if ((cp = strchr(s, '?'))) {
194		*cp = '\0';
195		if ((p = vlookup(s)) && vaccess(p->v_access, READ)) {
196			vprint(p);
197			return;
198		}
199	} else {
200		if (*s != '!')
201			p = vlookup(s);
202		else
203			p = vlookup(s+1);
204		if (p != NOVAL) {
205			vassign(p, s);
206			return;
207		}
208	}
209	printf("%s: unknown variable\r\n", s);
210}
211
212static void
213vprint(value_t *p)
214{
215	char *cp;
216
217	if (col > 0 && col < MIDDLE)
218		while (col++ < MIDDLE)
219			putchar(' ');
220	col += size(p->v_name);
221	switch (p->v_type&TMASK) {
222
223	case BOOL:
224		if (boolean(p->v_value) == FALSE) {
225			col++;
226			putchar('!');
227		}
228		printf("%s", p->v_name);
229		break;
230
231	case STRING:
232		printf("%s=", p->v_name);
233		col++;
234		if (p->v_value) {
235			cp = interp(p->v_value);
236			col += size(cp);
237			printf("%s", cp);
238		}
239		break;
240
241	case NUMBER:
242		col += 6;
243		printf("%s=%-5ld", p->v_name, number(p->v_value));
244		break;
245
246	case CHAR:
247		printf("%s=", p->v_name);
248		col++;
249		if (p->v_value) {
250			cp = ctrl(character(p->v_value));
251			col += size(cp);
252			printf("%s", cp);
253		}
254		break;
255	}
256	if (col >= MIDDLE) {
257		col = 0;
258		printf("\r\n");
259		return;
260	}
261}
262
263static int
264vaccess(unsigned int mode, unsigned int rw)
265{
266	if (mode & (rw<<PUBLIC))
267		return (1);
268	if (mode & (rw<<PRIVATE))
269		return (1);
270	return ((mode & (rw<<ROOT)) && getuid() == 0);
271}
272
273static value_t *
274vlookup(char *s)
275{
276	value_t *p;
277
278	for (p = vtable; p->v_name; p++)
279		if (equal(p->v_name, s) || (p->v_abrev && equal(p->v_abrev, s)))
280			return (p);
281	return (NULL);
282}
283
284static char *
285vinterp(char *s, int stop)
286{
287	char *p = s, c;
288	int num;
289
290	while ((c = *s++) && c != stop) {
291		switch (c) {
292
293		case '^':
294			if (*s)
295				*p++ = *s++ - 0100;
296			else
297				*p++ = c;
298			break;
299
300		case '\\':
301			num = 0;
302			c = *s++;
303			if (c >= '0' && c <= '7')
304				num = (num<<3)+(c-'0');
305			else {
306				char *q = "n\nr\rt\tb\bf\f";
307
308				for (; *q; q++)
309					if (c == *q++) {
310						*p++ = *q;
311						goto cont;
312					}
313				*p++ = c;
314			cont:
315				break;
316			}
317			if ((c = *s++) >= '0' && c <= '7') {
318				num = (num<<3)+(c-'0');
319				if ((c = *s++) >= '0' && c <= '7')
320					num = (num<<3)+(c-'0');
321				else
322					s--;
323			} else
324				s--;
325			*p++ = num;
326			break;
327
328		default:
329			*p++ = c;
330		}
331	}
332	*p = '\0';
333	return (c == stop ? s-1 : NULL);
334}
335
336/*
337 * assign variable s with value v (for NUMBER or STRING or CHAR types)
338 */
339int
340vstring(char *s, char *v)
341{
342	value_t *p;
343
344	p = vlookup(s);
345	if (p == 0)
346		return (1);
347	if (p->v_type&NUMBER)
348		vassign(p, (char *)(intptr_t)atoi(v));
349	else {
350		if (strcmp(s, "record") == 0)
351			v = expand(v);
352		vassign(p, v);
353	}
354	return (0);
355}
356