1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
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/*
36 * Shell output routines.  We use our own output routines because:
37 *	When a builtin command is interrupted we have to discard
38 *		any pending output.
39 *	When a builtin command appears in back quotes, we want to
40 *		save the output of the command in a region obtained
41 *		via malloc, rather than doing a fork and reading the
42 *		output of the command via a pipe.
43 */
44
45#include <stdio.h>	/* defines BUFSIZ */
46#include <string.h>
47#include <stdarg.h>
48#include <errno.h>
49#include <unistd.h>
50#include <stdlib.h>
51#include <wchar.h>
52#include <wctype.h>
53
54#include "shell.h"
55#include "syntax.h"
56#include "output.h"
57#include "memalloc.h"
58#include "error.h"
59#include "var.h"
60
61
62#define OUTBUFSIZ BUFSIZ
63#define MEM_OUT -2		/* output to dynamically allocated memory */
64#define OUTPUT_ERR 01		/* error occurred on output */
65
66static int doformat_wr(void *, const char *, int);
67
68struct output output = {NULL, NULL, NULL, OUTBUFSIZ, 1, 0};
69struct output errout = {NULL, NULL, NULL, 256, 2, 0};
70struct output memout = {NULL, NULL, NULL, 64, MEM_OUT, 0};
71struct output *out1 = &output;
72struct output *out2 = &errout;
73
74void
75outcslow(int c, struct output *file)
76{
77	outc(c, file);
78}
79
80void
81out1str(const char *p)
82{
83	outstr(p, out1);
84}
85
86void
87out1qstr(const char *p)
88{
89	outqstr(p, out1);
90}
91
92void
93out2str(const char *p)
94{
95	outstr(p, out2);
96}
97
98void
99out2qstr(const char *p)
100{
101	outqstr(p, out2);
102}
103
104void
105outstr(const char *p, struct output *file)
106{
107	outbin(p, strlen(p), file);
108}
109
110static void
111byteseq(int ch, struct output *file)
112{
113	char seq[4];
114
115	seq[0] = '\\';
116	seq[1] = (ch >> 6 & 0x3) + '0';
117	seq[2] = (ch >> 3 & 0x7) + '0';
118	seq[3] = (ch & 0x7) + '0';
119	outbin(seq, 4, file);
120}
121
122static void
123outdqstr(const char *p, struct output *file)
124{
125	const char *end;
126	mbstate_t mbs;
127	size_t clen;
128	wchar_t wc;
129
130	memset(&mbs, '\0', sizeof(mbs));
131	end = p + strlen(p);
132	outstr("$'", file);
133	while ((clen = mbrtowc(&wc, p, end - p + 1, &mbs)) != 0) {
134		if (clen == (size_t)-2) {
135			while (p < end)
136				byteseq(*p++, file);
137			break;
138		}
139		if (clen == (size_t)-1) {
140			memset(&mbs, '\0', sizeof(mbs));
141			byteseq(*p++, file);
142			continue;
143		}
144		if (wc == L'\n')
145			outcslow('\n', file), p++;
146		else if (wc == L'\r')
147			outstr("\\r", file), p++;
148		else if (wc == L'\t')
149			outstr("\\t", file), p++;
150		else if (!iswprint(wc)) {
151			for (; clen > 0; clen--)
152				byteseq(*p++, file);
153		} else {
154			if (wc == L'\'' || wc == L'\\')
155				outcslow('\\', file);
156			outbin(p, clen, file);
157			p += clen;
158		}
159	}
160	outcslow('\'', file);
161}
162
163/* Like outstr(), but quote for re-input into the shell. */
164void
165outqstr(const char *p, struct output *file)
166{
167	int i;
168
169	if (p[0] == '\0') {
170		outstr("''", file);
171		return;
172	}
173	for (i = 0; p[i] != '\0'; i++) {
174		if ((p[i] > '\0' && p[i] < ' ' && p[i] != '\n') ||
175		    (p[i] & 0x80) != 0 || p[i] == '\'') {
176			outdqstr(p, file);
177			return;
178		}
179	}
180
181	if (p[strcspn(p, "|&;<>()$`\\\" \n*?[~#=")] == '\0' ||
182			strcmp(p, "[") == 0) {
183		outstr(p, file);
184		return;
185	}
186
187	outcslow('\'', file);
188	outstr(p, file);
189	outcslow('\'', file);
190}
191
192void
193outbin(const void *data, size_t len, struct output *file)
194{
195	const char *p;
196
197	p = data;
198	while (len-- > 0)
199		outc(*p++, file);
200}
201
202void
203emptyoutbuf(struct output *dest)
204{
205	int offset, newsize;
206
207	if (dest->buf == NULL) {
208		INTOFF;
209		dest->buf = ckmalloc(dest->bufsize);
210		dest->nextc = dest->buf;
211		dest->bufend = dest->buf + dest->bufsize;
212		INTON;
213	} else if (dest->fd == MEM_OUT) {
214		offset = dest->nextc - dest->buf;
215		newsize = dest->bufsize << 1;
216		INTOFF;
217		dest->buf = ckrealloc(dest->buf, newsize);
218		dest->bufsize = newsize;
219		dest->bufend = dest->buf + newsize;
220		dest->nextc = dest->buf + offset;
221		INTON;
222	} else {
223		flushout(dest);
224	}
225}
226
227
228void
229flushall(void)
230{
231	flushout(&output);
232	flushout(&errout);
233}
234
235
236void
237flushout(struct output *dest)
238{
239
240	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
241		return;
242	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
243		dest->flags |= OUTPUT_ERR;
244	dest->nextc = dest->buf;
245}
246
247
248void
249freestdout(void)
250{
251	output.nextc = output.buf;
252}
253
254
255int
256outiserror(struct output *file)
257{
258	return (file->flags & OUTPUT_ERR);
259}
260
261
262void
263outclearerror(struct output *file)
264{
265	file->flags &= ~OUTPUT_ERR;
266}
267
268
269void
270outfmt(struct output *file, const char *fmt, ...)
271{
272	va_list ap;
273
274	va_start(ap, fmt);
275	doformat(file, fmt, ap);
276	va_end(ap);
277}
278
279
280void
281out1fmt(const char *fmt, ...)
282{
283	va_list ap;
284
285	va_start(ap, fmt);
286	doformat(out1, fmt, ap);
287	va_end(ap);
288}
289
290void
291out2fmt_flush(const char *fmt, ...)
292{
293	va_list ap;
294
295	va_start(ap, fmt);
296	doformat(out2, fmt, ap);
297	va_end(ap);
298	flushout(out2);
299}
300
301void
302fmtstr(char *outbuf, int length, const char *fmt, ...)
303{
304	va_list ap;
305
306	INTOFF;
307	va_start(ap, fmt);
308	vsnprintf(outbuf, length, fmt, ap);
309	va_end(ap);
310	INTON;
311}
312
313static int
314doformat_wr(void *cookie, const char *buf, int len)
315{
316	struct output *o;
317
318	o = (struct output *)cookie;
319	outbin(buf, len, o);
320
321	return (len);
322}
323
324void
325doformat(struct output *dest, const char *f, va_list ap)
326{
327	FILE *fp;
328
329	if ((fp = fwopen(dest, doformat_wr)) != NULL) {
330		vfprintf(fp, f, ap);
331		fclose(fp);
332	}
333}
334
335FILE *
336out1fp(void)
337{
338	return fwopen(out1, doformat_wr);
339}
340
341/*
342 * Version of write which resumes after a signal is caught.
343 */
344
345int
346xwrite(int fd, const char *buf, int nbytes)
347{
348	int ntry;
349	int i;
350	int n;
351
352	n = nbytes;
353	ntry = 0;
354	for (;;) {
355		i = write(fd, buf, n);
356		if (i > 0) {
357			if ((n -= i) <= 0)
358				return nbytes;
359			buf += i;
360			ntry = 0;
361		} else if (i == 0) {
362			if (++ntry > 10)
363				return nbytes - n;
364		} else if (errno != EINTR) {
365			return -1;
366		}
367	}
368}
369