output.c revision 127958 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
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 * 4. 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#ifndef lint
34#if 0
35static char sccsid[] = "@(#)output.c	8.2 (Berkeley) 5/4/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/bin/sh/output.c 127958 2004-04-06 20:06:54Z markm $");
40
41/*
42 * Shell output routines.  We use our own output routines because:
43 *	When a builtin command is interrupted we have to discard
44 *		any pending output.
45 *	When a builtin command appears in back quotes, we want to
46 *		save the output of the command in a region obtained
47 *		via malloc, rather than doing a fork and reading the
48 *		output of the command via a pipe.
49 */
50
51#include <stdio.h>	/* defines BUFSIZ */
52#include <string.h>
53#include <stdarg.h>
54#include <errno.h>
55#include <unistd.h>
56#include <stdlib.h>
57
58#include "shell.h"
59#include "syntax.h"
60#include "output.h"
61#include "memalloc.h"
62#include "error.h"
63#include "var.h"
64
65
66#define OUTBUFSIZ BUFSIZ
67#define BLOCK_OUT -2		/* output to a fixed block of memory */
68#define MEM_OUT -3		/* output to dynamically allocated memory */
69#define OUTPUT_ERR 01		/* error occurred on output */
70
71static int doformat_wr(void *, const char *, int);
72
73struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
74struct output errout = {NULL, 0, NULL, 100, 2, 0};
75struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
76struct output *out1 = &output;
77struct output *out2 = &errout;
78
79
80
81#ifdef mkinit
82
83INCLUDE "output.h"
84INCLUDE "memalloc.h"
85
86RESET {
87	out1 = &output;
88	out2 = &errout;
89	if (memout.buf != NULL) {
90		ckfree(memout.buf);
91		memout.buf = NULL;
92	}
93}
94
95#endif
96
97
98void
99out1str(const char *p)
100{
101	outstr(p, out1);
102}
103
104void
105out1qstr(const char *p)
106{
107	outqstr(p, out1);
108}
109
110void
111out2str(const char *p)
112{
113	outstr(p, out2);
114}
115
116void
117out2qstr(const char *p)
118{
119	outqstr(p, out2);
120}
121
122void
123outstr(const char *p, struct output *file)
124{
125	while (*p)
126		outc(*p++, file);
127	if (file == out2)
128		flushout(file);
129}
130
131/* Like outstr(), but quote for re-input into the shell. */
132void
133outqstr(const char *p, struct output *file)
134{
135	char ch;
136
137	if (p[strcspn(p, "|&;<>()$`\\\"'")] == '\0' && (!ifsset() ||
138	    p[strcspn(p, ifsval())] == '\0')) {
139		outstr(p, file);
140		return;
141	}
142
143	out1c('\'');
144	while ((ch = *p++) != '\0') {
145		switch (ch) {
146		case '\'':
147			/*
148			 * Can't quote single quotes inside single quotes;
149			 * close them, write escaped single quote, open again.
150			 */
151			outstr("'\\''", file);
152			break;
153		default:
154			outc(ch, file);
155		}
156	}
157	out1c('\'');
158}
159
160STATIC char out_junk[16];
161
162void
163emptyoutbuf(struct output *dest)
164{
165	int offset;
166
167	if (dest->fd == BLOCK_OUT) {
168		dest->nextc = out_junk;
169		dest->nleft = sizeof out_junk;
170		dest->flags |= OUTPUT_ERR;
171	} else if (dest->buf == NULL) {
172		INTOFF;
173		dest->buf = ckmalloc(dest->bufsize);
174		dest->nextc = dest->buf;
175		dest->nleft = dest->bufsize;
176		INTON;
177	} else if (dest->fd == MEM_OUT) {
178		offset = dest->bufsize;
179		INTOFF;
180		dest->bufsize <<= 1;
181		dest->buf = ckrealloc(dest->buf, dest->bufsize);
182		dest->nleft = dest->bufsize - offset;
183		dest->nextc = dest->buf + offset;
184		INTON;
185	} else {
186		flushout(dest);
187	}
188	dest->nleft--;
189}
190
191
192void
193flushall(void)
194{
195	flushout(&output);
196	flushout(&errout);
197}
198
199
200void
201flushout(struct output *dest)
202{
203
204	if (dest->buf == NULL || dest->nextc == dest->buf || dest->fd < 0)
205		return;
206	if (xwrite(dest->fd, dest->buf, dest->nextc - dest->buf) < 0)
207		dest->flags |= OUTPUT_ERR;
208	dest->nextc = dest->buf;
209	dest->nleft = dest->bufsize;
210}
211
212
213void
214freestdout(void)
215{
216	INTOFF;
217	if (output.buf) {
218		ckfree(output.buf);
219		output.buf = NULL;
220		output.nleft = 0;
221	}
222	INTON;
223}
224
225
226void
227outfmt(struct output *file, const char *fmt, ...)
228{
229	va_list ap;
230
231	va_start(ap, fmt);
232	doformat(file, fmt, ap);
233	va_end(ap);
234}
235
236
237void
238out1fmt(const char *fmt, ...)
239{
240	va_list ap;
241
242	va_start(ap, fmt);
243	doformat(out1, fmt, ap);
244	va_end(ap);
245}
246
247void
248dprintf(const char *fmt, ...)
249{
250	va_list ap;
251
252	va_start(ap, fmt);
253	doformat(out2, fmt, ap);
254	va_end(ap);
255	flushout(out2);
256}
257
258void
259fmtstr(char *outbuf, int length, const char *fmt, ...)
260{
261	va_list ap;
262	struct output strout;
263
264	strout.nextc = outbuf;
265	strout.nleft = length;
266	strout.fd = BLOCK_OUT;
267	strout.flags = 0;
268	va_start(ap, fmt);
269	doformat(&strout, fmt, ap);
270	va_end(ap);
271	outc('\0', &strout);
272	if (strout.flags & OUTPUT_ERR)
273		outbuf[length - 1] = '\0';
274}
275
276static int
277doformat_wr(void *cookie, const char *buf, int len)
278{
279	struct output *o;
280	int origlen;
281	unsigned char c;
282
283	o = (struct output *)cookie;
284	origlen = len;
285	while (len-- != 0) {
286		c = (unsigned char)*buf++;
287		outc(c, o);
288	}
289
290	return (origlen);
291}
292
293void
294doformat(struct output *dest, const char *f, va_list ap)
295{
296	FILE *fp;
297
298	if ((fp = fwopen(dest, doformat_wr)) != NULL) {
299		vfprintf(fp, f, ap);
300		fclose(fp);
301	}
302}
303
304/*
305 * Version of write which resumes after a signal is caught.
306 */
307
308int
309xwrite(int fd, char *buf, int nbytes)
310{
311	int ntry;
312	int i;
313	int n;
314
315	n = nbytes;
316	ntry = 0;
317	for (;;) {
318		i = write(fd, buf, n);
319		if (i > 0) {
320			if ((n -= i) <= 0)
321				return nbytes;
322			buf += i;
323			ntry = 0;
324		} else if (i == 0) {
325			if (++ntry > 10)
326				return nbytes - n;
327		} else if (errno != EINTR) {
328			return -1;
329		}
330	}
331}
332