FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_sbuf.c
1 /*-
2 * Copyright (c) 2000-2008 Poul-Henning Kamp
3 * Copyright (c) 2000-2008 Dag-Erling Coïdan Smørgrav
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer
11 * in this position and unchanged.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33
34 #ifdef _KERNEL
35 #include <sys/ctype.h>
36 #include <sys/errno.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/systm.h>
40 #include <sys/uio.h>
41 #include <machine/stdarg.h>
42 #else /* _KERNEL */
43 #include <ctype.h>
44 #include <errno.h>
45 #include <stdarg.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #endif /* _KERNEL */
50
51 #include <sys/sbuf.h>
52
53 struct sbuf_drain {
54 sbuf_drain_func *s_func; /* drain function */
55 void *s_arg; /* user-supplied drain argument */
56 int s_error; /* current error code */
57 };
58
59 #ifdef _KERNEL
60 static MALLOC_DEFINE(M_SBUF, "sbuf", "string buffers");
61 #define SBMALLOC(size) malloc(size, M_SBUF, M_WAITOK)
62 #define SBFREE(buf) free(buf, M_SBUF)
63 #else /* _KERNEL */
64 #define KASSERT(e, m)
65 #define SBMALLOC(size) malloc(size)
66 #define SBFREE(buf) free(buf)
67 #endif /* _KERNEL */
68
69 /*
70 * Predicates
71 */
72 #define SBUF_ISDYNAMIC(s) ((s)->s_flags & SBUF_DYNAMIC)
73 #define SBUF_ISDYNSTRUCT(s) ((s)->s_flags & SBUF_DYNSTRUCT)
74 #define SBUF_ISFINISHED(s) ((s)->s_flags & SBUF_FINISHED)
75 #define SBUF_HASOVERFLOWED(s) ((s)->s_flags & SBUF_OVERFLOWED)
76 #define SBUF_HASROOM(s) ((s)->s_len < (s)->s_size - 1)
77 #define SBUF_FREESPACE(s) ((s)->s_size - (s)->s_len - 1)
78 #define SBUF_CANEXTEND(s) ((s)->s_flags & SBUF_AUTOEXTEND)
79
80 /*
81 * Set / clear flags
82 */
83 #define SBUF_SETFLAG(s, f) do { (s)->s_flags |= (f); } while (0)
84 #define SBUF_CLEARFLAG(s, f) do { (s)->s_flags &= ~(f); } while (0)
85
86 #define SBUF_MINEXTENDSIZE 16 /* Should be power of 2. */
87 #define SBUF_MAXEXTENDSIZE PAGE_SIZE
88 #define SBUF_MAXEXTENDINCR PAGE_SIZE
89
90 /*
91 * Debugging support
92 */
93 #if defined(_KERNEL) && defined(INVARIANTS)
94
95 static void
96 _assert_sbuf_integrity(const char *fun, struct sbuf *s)
97 {
98
99 KASSERT(s != NULL,
100 ("%s called with a NULL sbuf pointer", fun));
101 KASSERT(s->s_buf != NULL,
102 ("%s called with uninitialized or corrupt sbuf", fun));
103 KASSERT(s->s_len < s->s_size,
104 ("wrote past end of sbuf (%d >= %d)", s->s_len, s->s_size));
105 }
106
107 static void
108 _assert_sbuf_state(const char *fun, struct sbuf *s, int state)
109 {
110
111 KASSERT((s->s_flags & SBUF_FINISHED) == state,
112 ("%s called with %sfinished or corrupt sbuf", fun,
113 (state ? "un" : "")));
114 }
115
116 #define assert_sbuf_integrity(s) _assert_sbuf_integrity(__func__, (s))
117 #define assert_sbuf_state(s, i) _assert_sbuf_state(__func__, (s), (i))
118
119 #else /* _KERNEL && INVARIANTS */
120
121 #define assert_sbuf_integrity(s) do { } while (0)
122 #define assert_sbuf_state(s, i) do { } while (0)
123
124 #endif /* _KERNEL && INVARIANTS */
125
126 #ifdef CTASSERT
127 CTASSERT(powerof2(SBUF_MAXEXTENDSIZE));
128 CTASSERT(powerof2(SBUF_MAXEXTENDINCR));
129 #endif
130
131 static int
132 sbuf_extendsize(int size)
133 {
134 int newsize;
135
136 if (size < (int)SBUF_MAXEXTENDSIZE) {
137 newsize = SBUF_MINEXTENDSIZE;
138 while (newsize < size)
139 newsize *= 2;
140 } else {
141 newsize = roundup2(size, SBUF_MAXEXTENDINCR);
142 }
143 KASSERT(newsize >= size, ("%s: %d < %d\n", __func__, newsize, size));
144 return (newsize);
145 }
146
147
148 /*
149 * Extend an sbuf.
150 */
151 static int
152 sbuf_extend(struct sbuf *s, int addlen)
153 {
154 char *newbuf;
155 int newsize;
156
157 if (!SBUF_CANEXTEND(s))
158 return (-1);
159 newsize = sbuf_extendsize(s->s_size + addlen);
160 newbuf = SBMALLOC(newsize);
161 if (newbuf == NULL)
162 return (-1);
163 bcopy(s->s_buf, newbuf, s->s_size);
164 if (SBUF_ISDYNAMIC(s))
165 SBFREE(s->s_buf);
166 else
167 SBUF_SETFLAG(s, SBUF_DYNAMIC);
168 s->s_buf = newbuf;
169 s->s_size = newsize;
170 return (0);
171 }
172
173 /*
174 * Initialize an sbuf.
175 * If buf is non-NULL, it points to a static or already-allocated string
176 * big enough to hold at least length characters.
177 */
178 struct sbuf *
179 sbuf_new(struct sbuf *s, char *buf, int length, int flags)
180 {
181
182 KASSERT(length >= 0,
183 ("attempt to create an sbuf of negative length (%d)", length));
184 KASSERT((flags & ~SBUF_USRFLAGMSK) == 0,
185 ("%s called with invalid flags", __func__));
186
187 flags &= SBUF_USRFLAGMSK;
188 if (s == NULL) {
189 s = SBMALLOC(sizeof(*s));
190 if (s == NULL)
191 return (NULL);
192 bzero(s, sizeof(*s));
193 s->s_flags = flags;
194 SBUF_SETFLAG(s, SBUF_DYNSTRUCT);
195 } else {
196 bzero(s, sizeof(*s));
197 s->s_flags = flags;
198 }
199 s->s_size = length;
200 if (buf != NULL) {
201 s->s_buf = buf;
202 return (s);
203 }
204 if ((flags & SBUF_AUTOEXTEND) != 0)
205 s->s_size = sbuf_extendsize(s->s_size);
206 s->s_buf = SBMALLOC(s->s_size);
207 if (s->s_buf == NULL) {
208 if (SBUF_ISDYNSTRUCT(s))
209 SBFREE(s);
210 return (NULL);
211 }
212 SBUF_SETFLAG(s, SBUF_DYNAMIC);
213 return (s);
214 }
215
216 #ifdef _KERNEL
217 /*
218 * Create an sbuf with uio data
219 */
220 struct sbuf *
221 sbuf_uionew(struct sbuf *s, struct uio *uio, int *error)
222 {
223
224 KASSERT(uio != NULL,
225 ("%s called with NULL uio pointer", __func__));
226 KASSERT(error != NULL,
227 ("%s called with NULL error pointer", __func__));
228
229 s = sbuf_new(s, NULL, uio->uio_resid + 1, 0);
230 if (s == NULL) {
231 *error = ENOMEM;
232 return (NULL);
233 }
234 *error = uiomove(s->s_buf, uio->uio_resid, uio);
235 if (*error != 0) {
236 sbuf_delete(s);
237 return (NULL);
238 }
239 s->s_len = s->s_size - 1;
240 *error = 0;
241 return (s);
242 }
243 #endif
244
245 /*
246 * Clear an sbuf and reset its position.
247 */
248 void
249 sbuf_clear(struct sbuf *s)
250 {
251
252 assert_sbuf_integrity(s);
253 /* don't care if it's finished or not */
254
255 SBUF_CLEARFLAG(s, SBUF_FINISHED);
256 SBUF_CLEARFLAG(s, SBUF_OVERFLOWED);
257 if (s->s_drain != NULL)
258 s->s_drain->s_error = 0;
259 s->s_len = 0;
260 }
261
262 /*
263 * Set the sbuf's end position to an arbitrary value.
264 * Effectively truncates the sbuf at the new position.
265 */
266 int
267 sbuf_setpos(struct sbuf *s, int pos)
268 {
269
270 assert_sbuf_integrity(s);
271 assert_sbuf_state(s, 0);
272
273 KASSERT(pos >= 0,
274 ("attempt to seek to a negative position (%d)", pos));
275 KASSERT(pos < s->s_size,
276 ("attempt to seek past end of sbuf (%d >= %d)", pos, s->s_size));
277
278 if (pos < 0 || pos > s->s_len)
279 return (-1);
280 s->s_len = pos;
281 return (0);
282 }
283
284 /*
285 * Set up a drain function and argument on an sbuf to flush data to
286 * when the sbuf buffer overflows.
287 */
288 void
289 sbuf_set_drain(struct sbuf *s, sbuf_drain_func *func, void *ctx)
290 {
291
292 assert_sbuf_state(s, 0);
293 assert_sbuf_integrity(s);
294 KASSERT((s->s_drain != NULL && func == s->s_drain->s_func) ||
295 s->s_len == 0,
296 ("Cannot change drain to %p on non-empty sbuf %p", func, s));
297 if (func == NULL) {
298 SBFREE(s->s_drain);
299 s->s_drain = NULL;
300 return;
301 }
302 if (s->s_drain == NULL) {
303 s->s_drain = SBMALLOC(sizeof(*s->s_drain));
304 if (s->s_drain == NULL)
305 return;
306 }
307 s->s_drain->s_func = func;
308 s->s_drain->s_arg = ctx;
309 s->s_drain->s_error = 0;
310 }
311
312 /*
313 * Call the drain and process the return.
314 */
315 static int
316 sbuf_drain(struct sbuf *s)
317 {
318 int len;
319
320 KASSERT(s->s_len > 0, ("Shouldn't drain empty sbuf %p", s));
321 len = s->s_drain->s_func(s->s_drain->s_arg, s->s_buf, s->s_len);
322 if (len < 0) {
323 s->s_drain->s_error = -len;
324 SBUF_SETFLAG(s, SBUF_OVERFLOWED);
325 return (s->s_drain->s_error);
326 }
327 KASSERT(len > 0 && len <= s->s_len,
328 ("Bad drain amount %d for sbuf %p", len, s));
329 s->s_len -= len;
330 /*
331 * Fast path for the expected case where all the data was
332 * drained.
333 */
334 if (s->s_len == 0)
335 return (0);
336 /*
337 * Move the remaining characters to the beginning of the
338 * string.
339 */
340 memmove(s->s_buf, s->s_buf + len, s->s_len);
341 return (0);
342 }
343
344 /*
345 * Append a byte to an sbuf. This is the core function for appending
346 * to an sbuf and is the main place that deals with extending the
347 * buffer and marking overflow.
348 */
349 static void
350 sbuf_put_byte(int c, struct sbuf *s)
351 {
352
353 assert_sbuf_integrity(s);
354 assert_sbuf_state(s, 0);
355
356 if (SBUF_HASOVERFLOWED(s))
357 return;
358 if (SBUF_FREESPACE(s) <= 0) {
359 /*
360 * If there is a drain, use it, otherwise extend the
361 * buffer.
362 */
363 if (s->s_drain != NULL)
364 (void)sbuf_drain(s);
365 else if (sbuf_extend(s, 1) < 0)
366 SBUF_SETFLAG(s, SBUF_OVERFLOWED);
367 if (SBUF_HASOVERFLOWED(s))
368 return;
369 }
370 s->s_buf[s->s_len++] = c;
371 }
372
373 /*
374 * Append a non-NUL character to an sbuf. This prototype signature is
375 * suitable for use with kvprintf(9).
376 */
377 static void
378 sbuf_putc_func(int c, void *arg)
379 {
380
381 if (c != '\0')
382 sbuf_put_byte(c, arg);
383 }
384
385 /*
386 * Append a byte string to an sbuf.
387 */
388 int
389 sbuf_bcat(struct sbuf *s, const void *buf, size_t len)
390 {
391 const char *str = buf;
392 const char *end = str + len;
393
394 assert_sbuf_integrity(s);
395 assert_sbuf_state(s, 0);
396
397 if (SBUF_HASOVERFLOWED(s))
398 return (-1);
399 for (; str < end; str++) {
400 sbuf_put_byte(*str, s);
401 if (SBUF_HASOVERFLOWED(s))
402 return (-1);
403 }
404 return (0);
405 }
406
407 #ifdef _KERNEL
408 /*
409 * Copy a byte string from userland into an sbuf.
410 */
411 int
412 sbuf_bcopyin(struct sbuf *s, const void *uaddr, size_t len)
413 {
414
415 assert_sbuf_integrity(s);
416 assert_sbuf_state(s, 0);
417 KASSERT(s->s_drain == NULL,
418 ("Nonsensical copyin to sbuf %p with a drain", s));
419
420 if (SBUF_HASOVERFLOWED(s))
421 return (-1);
422 if (len == 0)
423 return (0);
424 if (len > SBUF_FREESPACE(s)) {
425 sbuf_extend(s, len - SBUF_FREESPACE(s));
426 if (SBUF_FREESPACE(s) < len)
427 len = SBUF_FREESPACE(s);
428 }
429 if (copyin(uaddr, s->s_buf + s->s_len, len) != 0)
430 return (-1);
431 s->s_len += len;
432
433 return (0);
434 }
435 #endif
436
437 /*
438 * Copy a byte string into an sbuf.
439 */
440 int
441 sbuf_bcpy(struct sbuf *s, const void *buf, size_t len)
442 {
443
444 assert_sbuf_integrity(s);
445 assert_sbuf_state(s, 0);
446
447 sbuf_clear(s);
448 return (sbuf_bcat(s, buf, len));
449 }
450
451 /*
452 * Append a string to an sbuf.
453 */
454 int
455 sbuf_cat(struct sbuf *s, const char *str)
456 {
457
458 assert_sbuf_integrity(s);
459 assert_sbuf_state(s, 0);
460
461 if (SBUF_HASOVERFLOWED(s))
462 return (-1);
463
464 while (*str != '\0') {
465 sbuf_put_byte(*str++, s);
466 if (SBUF_HASOVERFLOWED(s))
467 return (-1);
468 }
469 return (0);
470 }
471
472 #ifdef _KERNEL
473 /*
474 * Append a string from userland to an sbuf.
475 */
476 int
477 sbuf_copyin(struct sbuf *s, const void *uaddr, size_t len)
478 {
479 size_t done;
480
481 assert_sbuf_integrity(s);
482 assert_sbuf_state(s, 0);
483 KASSERT(s->s_drain == NULL,
484 ("Nonsensical copyin to sbuf %p with a drain", s));
485
486 if (SBUF_HASOVERFLOWED(s))
487 return (-1);
488
489 if (len == 0)
490 len = SBUF_FREESPACE(s); /* XXX return 0? */
491 if (len > SBUF_FREESPACE(s)) {
492 sbuf_extend(s, len);
493 if (SBUF_FREESPACE(s) < len)
494 len = SBUF_FREESPACE(s);
495 }
496 switch (copyinstr(uaddr, s->s_buf + s->s_len, len + 1, &done)) {
497 case ENAMETOOLONG:
498 SBUF_SETFLAG(s, SBUF_OVERFLOWED);
499 /* fall through */
500 case 0:
501 s->s_len += done - 1;
502 break;
503 default:
504 return (-1); /* XXX */
505 }
506
507 return (done);
508 }
509 #endif
510
511 /*
512 * Copy a string into an sbuf.
513 */
514 int
515 sbuf_cpy(struct sbuf *s, const char *str)
516 {
517
518 assert_sbuf_integrity(s);
519 assert_sbuf_state(s, 0);
520
521 sbuf_clear(s);
522 return (sbuf_cat(s, str));
523 }
524
525 /*
526 * Format the given argument list and append the resulting string to an sbuf.
527 */
528 #ifdef _KERNEL
529 int
530 sbuf_vprintf(struct sbuf *s, const char *fmt, va_list ap)
531 {
532
533 assert_sbuf_integrity(s);
534 assert_sbuf_state(s, 0);
535
536 KASSERT(fmt != NULL,
537 ("%s called with a NULL format string", __func__));
538
539 (void)kvprintf(fmt, sbuf_putc_func, s, 10, ap);
540 if (SBUF_HASOVERFLOWED(s))
541 return (-1);
542 return (0);
543 }
544 #else /* !_KERNEL */
545 int
546 sbuf_vprintf(struct sbuf *s, const char *fmt, va_list ap)
547 {
548 va_list ap_copy;
549 int error, len;
550
551 assert_sbuf_integrity(s);
552 assert_sbuf_state(s, 0);
553
554 KASSERT(fmt != NULL,
555 ("%s called with a NULL format string", __func__));
556
557 if (SBUF_HASOVERFLOWED(s))
558 return (-1);
559
560 /*
561 * For the moment, there is no way to get vsnprintf(3) to hand
562 * back a character at a time, to push everything into
563 * sbuf_putc_func() as was done for the kernel.
564 *
565 * In userspace, while drains are useful, there's generally
566 * not a problem attempting to malloc(3) on out of space. So
567 * expand a userland sbuf if there is not enough room for the
568 * data produced by sbuf_[v]printf(3).
569 */
570
571 error = 0;
572 do {
573 va_copy(ap_copy, ap);
574 len = vsnprintf(&s->s_buf[s->s_len], SBUF_FREESPACE(s) + 1,
575 fmt, ap_copy);
576 va_end(ap_copy);
577
578 if (SBUF_FREESPACE(s) >= len)
579 break;
580 /* Cannot print with the current available space. */
581 if (s->s_drain != NULL && s->s_len > 0)
582 error = sbuf_drain(s);
583 else
584 error = sbuf_extend(s, len - SBUF_FREESPACE(s));
585 } while (error == 0);
586
587 /*
588 * s->s_len is the length of the string, without the terminating nul.
589 * When updating s->s_len, we must subtract 1 from the length that
590 * we passed into vsnprintf() because that length includes the
591 * terminating nul.
592 *
593 * vsnprintf() returns the amount that would have been copied,
594 * given sufficient space, so don't over-increment s_len.
595 */
596 if (SBUF_FREESPACE(s) < len)
597 len = SBUF_FREESPACE(s);
598 s->s_len += len;
599 if (!SBUF_HASROOM(s) && !SBUF_CANEXTEND(s))
600 SBUF_SETFLAG(s, SBUF_OVERFLOWED);
601
602 KASSERT(s->s_len < s->s_size,
603 ("wrote past end of sbuf (%d >= %d)", s->s_len, s->s_size));
604
605 if (SBUF_HASOVERFLOWED(s))
606 return (-1);
607 return (0);
608 }
609 #endif /* _KERNEL */
610
611 /*
612 * Format the given arguments and append the resulting string to an sbuf.
613 */
614 int
615 sbuf_printf(struct sbuf *s, const char *fmt, ...)
616 {
617 va_list ap;
618 int result;
619
620 va_start(ap, fmt);
621 result = sbuf_vprintf(s, fmt, ap);
622 va_end(ap);
623 return (result);
624 }
625
626 /*
627 * Append a character to an sbuf.
628 */
629 int
630 sbuf_putc(struct sbuf *s, int c)
631 {
632
633 sbuf_putc_func(c, s);
634 if (SBUF_HASOVERFLOWED(s))
635 return (-1);
636 return (0);
637 }
638
639 /*
640 * Trim whitespace characters from end of an sbuf.
641 */
642 int
643 sbuf_trim(struct sbuf *s)
644 {
645
646 assert_sbuf_integrity(s);
647 assert_sbuf_state(s, 0);
648 KASSERT(s->s_drain == NULL,
649 ("%s makes no sense on sbuf %p with drain", __func__, s));
650
651 if (SBUF_HASOVERFLOWED(s))
652 return (-1);
653
654 while (s->s_len > 0 && isspace(s->s_buf[s->s_len-1]))
655 --s->s_len;
656
657 return (0);
658 }
659
660 /*
661 * Check if an sbuf overflowed
662 */
663 int
664 sbuf_overflowed(struct sbuf *s)
665 {
666
667 return (SBUF_HASOVERFLOWED(s));
668 }
669
670 /*
671 * Finish off an sbuf.
672 */
673 int
674 sbuf_finish(struct sbuf *s)
675 {
676 int error = 0;
677
678 assert_sbuf_integrity(s);
679 assert_sbuf_state(s, 0);
680
681 if (s->s_drain != NULL) {
682 error = s->s_drain->s_error;
683 while (s->s_len > 0 && error == 0)
684 error = sbuf_drain(s);
685 } else if (SBUF_HASOVERFLOWED(s))
686 error = ENOMEM;
687 s->s_buf[s->s_len] = '\0';
688 SBUF_CLEARFLAG(s, SBUF_OVERFLOWED);
689 SBUF_SETFLAG(s, SBUF_FINISHED);
690 #ifdef _KERNEL
691 return (error);
692 #else
693 /*XXX*/if (error) {
694 errno = error;
695 return (-1);
696 } else
697 return (0);
698 #endif
699 }
700
701 /*
702 * Return a pointer to the sbuf data.
703 */
704 char *
705 sbuf_data(struct sbuf *s)
706 {
707
708 assert_sbuf_integrity(s);
709 assert_sbuf_state(s, SBUF_FINISHED);
710 KASSERT(s->s_drain == NULL,
711 ("%s makes no sense on sbuf %p with drain", __func__, s));
712
713 return (s->s_buf);
714 }
715
716 /*
717 * Return the length of the sbuf data.
718 */
719 int
720 sbuf_len(struct sbuf *s)
721 {
722
723 assert_sbuf_integrity(s);
724 /* don't care if it's finished or not */
725 KASSERT(s->s_drain == NULL,
726 ("%s makes no sense on sbuf %p with drain", __func__, s));
727
728 if (SBUF_HASOVERFLOWED(s))
729 return (-1);
730 return (s->s_len);
731 }
732
733 /*
734 * Clear an sbuf, free its buffer if necessary.
735 */
736 void
737 sbuf_delete(struct sbuf *s)
738 {
739 int isdyn;
740
741 assert_sbuf_integrity(s);
742 /* don't care if it's finished or not */
743
744 if (SBUF_ISDYNAMIC(s))
745 SBFREE(s->s_buf);
746 if (s->s_drain != NULL)
747 SBFREE(s->s_drain);
748 isdyn = SBUF_ISDYNSTRUCT(s);
749 bzero(s, sizeof(*s));
750 if (isdyn)
751 SBFREE(s);
752 }
753
754 /*
755 * Check if an sbuf has been finished.
756 */
757 int
758 sbuf_done(struct sbuf *s)
759 {
760
761 return (SBUF_ISFINISHED(s));
762 }
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