summary refs log tree commit diff
path: root/src/output.c
blob: e9ee9b4d7ad8a68647b733885574743642111238 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Shell output routines.  We use our own output routines because:
 *	When a builtin command is interrupted we have to discard
 *		any pending output.
 *	When a builtin command appears in back quotes, we want to
 *		save the output of the command in a region obtained
 *		via malloc, rather than doing a fork and reading the
 *		output of the command via a pipe.
 *	Our output routines may be smaller than the stdio routines.
 */

#include <sys/types.h>		/* quad_t */
#include <sys/param.h>		/* BSD4_4 */
#include <sys/ioctl.h>

#include <stdio.h>	/* defines BUFSIZ */
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef USE_GLIBC_STDIO
#include <fcntl.h>
#endif
#include <limits.h>

#include "shell.h"
#include "syntax.h"
#include "output.h"
#include "memalloc.h"
#include "error.h"
#include "main.h"
#include "system.h"


#define OUTBUFSIZ BUFSIZ
#define MEM_OUT -3		/* output to dynamically allocated memory */


#ifdef USE_GLIBC_STDIO
struct output output = {
	.stream = 0, .nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = 1, .flags = 0
};
struct output errout = {
	.stream = 0, .nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = 2, .flags = 0
}
#ifdef notyet
struct output memout = {
	.stream = 0, .nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = MEM_OUT, .flags = 0
};
#endif
#else
struct output output = {
	.nextc = 0, .end = 0, .buf = 0, .bufsize = OUTBUFSIZ, .fd = 1, .flags = 0
};
struct output errout = {
	.nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = 2, .flags = 0
};
struct output preverrout;
#ifdef notyet
struct output memout = {
	.nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = MEM_OUT, .flags = 0
};
#endif
#endif
struct output *out1 = &output;
struct output *out2 = &errout;


static int xvsnprintf(char *, size_t, const char *, va_list);


#ifdef mkinit

INCLUDE "output.h"
INCLUDE "memalloc.h"

INIT {
#ifdef USE_GLIBC_STDIO
	initstreams();
#endif
}

RESET {
#ifdef notyet
	out1 = &output;
	out2 = &errout;
#ifdef USE_GLIBC_STDIO
	if (memout.stream != NULL)
		__closememout();
#endif
	if (memout.buf != NULL) {
		ckfree(memout.buf);
		memout.buf = NULL;
	}
#endif
}

#endif


void
outmem(const char *p, size_t len, struct output *dest)
{
#ifdef USE_GLIBC_STDIO
	INTOFF;
	fwrite(p, 1, len, dest->stream);
	INTON;
#else
	size_t bufsize;
	size_t offset;
	size_t nleft;

	nleft = dest->end - dest->nextc;
	if (likely(nleft >= len)) {
buffered:
		dest->nextc = mempcpy(dest->nextc, p, len);
		return;
	}

	bufsize = dest->bufsize;
	if (!bufsize) {
		;
	} else if (dest->buf == NULL) {
#ifdef notyet
		if (dest->fd == MEM_OUT && len > bufsize) {
			bufsize = len;
		}
#endif
		offset = 0;
#ifdef notyet
		goto alloc;
	} else if (dest->fd == MEM_OUT) {
		offset = bufsize;
		if (bufsize >= len) {
			bufsize <<= 1;
		} else {
			bufsize += len;
		}
		if (bufsize < offset)
			goto err;
alloc:
#endif
		INTOFF;
		dest->buf = ckrealloc(dest->buf, bufsize);
		dest->bufsize = bufsize;
		dest->end = dest->buf + bufsize;
		dest->nextc = dest->buf + offset;
		INTON;
	} else {
		flushout(dest);
	}

	nleft = dest->end - dest->nextc;
	if (nleft > len)
		goto buffered;

	if ((xwrite(dest->fd, p, len))) {
#ifdef notyet
err:
#endif
		dest->flags |= OUTPUT_ERR;
	}
#endif
}


void
outstr(const char *p, struct output *file)
{
#ifdef USE_GLIBC_STDIO
	INTOFF;
	fputs(p, file->stream);
	INTON;
#else
	size_t len;

	len = strlen(p);
	outmem(p, len, file);
#endif
}


#ifndef USE_GLIBC_STDIO


void
outcslow(int c, struct output *dest)
{
	char buf = c;
	outmem(&buf, 1, dest);
}
#endif


void
flushall(void)
{
	flushout(&output);
#ifdef FLUSHERR
	flushout(&errout);
#endif
}


void
flushout(struct output *dest)
{
#ifdef USE_GLIBC_STDIO
	INTOFF;
	fflush(dest->stream);
	INTON;
#else
	size_t len;

	len = dest->nextc - dest->buf;
	if (!len || dest->fd < 0)
		return;
	dest->nextc = dest->buf;
	if ((xwrite(dest->fd, dest->buf, len)))
		dest->flags |= OUTPUT_ERR;
#endif
}


void
outfmt(struct output *file, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	doformat(file, fmt, ap);
	va_end(ap);
}


void
out1fmt(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	doformat(out1, fmt, ap);
	va_end(ap);
}


int
fmtstr(char *outbuf, size_t length, const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = xvsnprintf(outbuf, length, fmt, ap);
	va_end(ap);
	return ret > (int)length ? length : ret;
}


static int xvasprintf(char **sp, size_t size, const char *f, va_list ap)
{
	char *s;
	int len;
	va_list ap2;

	va_copy(ap2, ap);
	len = xvsnprintf(*sp, size, f, ap2);
	va_end(ap2);
	if (len < 0)
		sh_error("xvsnprintf failed");
	if (len < size)
		return len;

	s = stalloc((len >= stackblocksize() ? len : stackblocksize()) + 1);
	*sp = s;
	len = xvsnprintf(s, len + 1, f, ap);
	return len;
}


int xasprintf(char **sp, const char *f, ...)
{
	va_list ap;
	int ret;

	va_start(ap, f);
	ret = xvasprintf(sp, 0, f, ap);
	va_end(ap);
	return ret;
}


#ifndef USE_GLIBC_STDIO
void
doformat(struct output *dest, const char *f, va_list ap)
{
	struct stackmark smark;
	char *s;
	int len;
	int olen;

	setstackmark(&smark);
	s = dest->nextc;
	olen = dest->end - dest->nextc;
	len = xvasprintf(&s, olen, f, ap);
	if (likely(olen > len)) {
		dest->nextc += len;
		goto out;
	}
	outmem(s, len, dest);
out:
	popstackmark(&smark);
}
#endif



/*
 * Version of write which resumes after a signal is caught.
 */

int
xwrite(int fd, const void *p, size_t n)
{
	const char *buf = p;

	while (n) {
		ssize_t i;
		size_t m;

		m = n;
		if (m > SSIZE_MAX)
			m = SSIZE_MAX;
		do {
			i = write(fd, buf, m);
		} while (i < 0 && errno == EINTR);
		if (i < 0)
			return -1;
		buf += i;
		n -= i;
	}
	return 0;
}


#ifdef notyet
#ifdef USE_GLIBC_STDIO
void initstreams() {
	output.stream = stdout;
	errout.stream = stderr;
}


void
openmemout(void) {
	INTOFF;
	memout.stream = open_memstream(&memout.buf, &memout.bufsize);
	INTON;
}


int
__closememout(void) {
	int error;
	error = fclose(memout.stream);
	memout.stream = NULL;
	return error;
}
#endif
#endif


static int
xvsnprintf(char *outbuf, size_t length, const char *fmt, va_list ap)
{
	int ret;

#ifdef __sun
	/*
	 * vsnprintf() on older versions of Solaris returns -1 when
	 * passed a length of 0.  To avoid this, use a dummy
	 * 1-character buffer instead.
	 */
	char dummy[1];

	if (length == 0) {
		outbuf = dummy;
		length = sizeof(dummy);
	}
#endif

	INTOFF;
	ret = vsnprintf(outbuf, length, fmt, ap);
	INTON;
	return ret;
}