src/channel.c - haproxy - Gitiles

 /*
  * Channel management functions.
  *
  * Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  *
  */

 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>

 #include <common/config.h>
 #include <common/memory.h>
 #include <common/buffer.h>
 #include <proto/channel.h>
 #include <types/global.h>


 /* Note: this code has not yet been completely cleaned up and still refers to
  * the word "buffer" when "channel" is meant instead.
  */
 struct pool_head *pool2_buffer;


 /* perform minimal intializations, report 0 in case of error, 1 if OK. */
 int init_buffer()
 {
 	pool2_buffer = create_pool("buffer", sizeof(struct channel) + global.tune.bufsize, MEM_F_SHARED);
 	return pool2_buffer != NULL;
 }

 /* Schedule up to <bytes> more bytes to be forwarded by the buffer without notifying
  * the task. Any pending data in the buffer is scheduled to be sent as well,
  * in the limit of the number of bytes to forward. This must be the only method
  * to use to schedule bytes to be sent. If the requested number is too large, it
  * is automatically adjusted. The number of bytes taken into account is returned.
  * Directly touching ->to_forward will cause lockups when ->o goes down to
  * zero if nobody is ready to push the remaining data.
  */
 unsigned long long buffer_forward(struct channel *buf, unsigned long long bytes)
 {
 	unsigned int new_forward;
 	unsigned int forwarded;
 	unsigned int bytes32;

 	bytes32 = bytes;

 	/* hint: avoid comparisons on long long for the fast case, since if the
 	 * length does not fit in an unsigned it, it will never be forwarded at
 	 * once anyway.
 	 */
 	if (bytes <= ~0U) {
 		if (bytes32 <= buf->buf.i) {
 			/* OK this amount of bytes might be forwarded at once */
 			if (!bytes32)
 				return 0;
 			b_adv(buf, bytes32);
 			return bytes;
 		}
 	}

 	forwarded = buf->buf.i;
 	b_adv(buf, buf->buf.i);

 	/* Note: the case below is the only case where we may return
 	 * a byte count that does not fit into a 32-bit number.
 	 */
 	if (likely(buf->to_forward == BUF_INFINITE_FORWARD))
 		return bytes;

 	if (likely(bytes == BUF_INFINITE_FORWARD)) {
 		buf->to_forward = bytes;
 		return bytes;
 	}

 	new_forward = buf->to_forward + bytes - forwarded;
 	bytes = forwarded; /* at least those bytes were scheduled */

 	if (new_forward <= buf->to_forward) {
 		/* integer overflow detected, let's assume no more than 2G at once */
 		new_forward = MID_RANGE(new_forward);
 	}

 	if (new_forward > buf->to_forward) {
 		bytes += new_forward - buf->to_forward;
 		buf->to_forward = new_forward;
 	}
 	return bytes;
 }

 /* writes <len> bytes from message <msg> to buffer <buf>. Returns -1 in case of
  * success, -2 if the message is larger than the buffer size, or the number of
  * bytes available otherwise. The send limit is automatically adjusted with the
  * amount of data written. FIXME-20060521: handle unaligned data.
  * Note: this function appends data to the buffer's output and possibly overwrites
  * any pending input data which are assumed not to exist.
  */
 int bo_inject(struct channel *buf, const char *msg, int len)
 {
 	int max;

 	if (len == 0)
 		return -1;

 	if (len > buf->buf.size) {
 		/* we can't write this chunk and will never be able to, because
 		 * it is larger than the buffer. This must be reported as an
 		 * error. Then we return -2 so that writers that don't care can
 		 * ignore it and go on, and others can check for this value.
 		 */
 		return -2;
 	}

 	max = buffer_realign(&buf->buf);

 	if (len > max)
 		return max;

 	memcpy(buf->buf.p, msg, len);
 	buf->buf.o += len;
 	buf->buf.p = b_ptr(&buf->buf, len);
 	buf->total += len;

 	buf->flags &= ~(BF_OUT_EMPTY|BF_FULL);
 	if (bi_full(buf))
 		buf->flags |= BF_FULL;

 	return -1;
 }

 /* Tries to copy character <c> into buffer <buf> after length controls. The
  * ->o and to_forward pointers are updated. If the buffer's input is
  * closed, -2 is returned. If there is not enough room left in the buffer, -1
  * is returned. Otherwise the number of bytes copied is returned (1). Buffer
  * flags FULL, EMPTY and READ_PARTIAL are updated if some data can be
  * transferred.
  */
 int bi_putchr(struct channel *buf, char c)
 {
 	if (unlikely(buffer_input_closed(buf)))
 		return -2;

 	if (buf->flags & BF_FULL)
 		return -1;

 	*bi_end(&buf->buf) = c;

 	buf->buf.i++;
 	if (bi_full(buf))
 		buf->flags |= BF_FULL;
 	buf->flags |= BF_READ_PARTIAL;

 	if (buf->to_forward >= 1) {
 		if (buf->to_forward != BUF_INFINITE_FORWARD)
 			buf->to_forward--;
 		b_adv(buf, 1);
 	}

 	buf->total++;
 	return 1;
 }

 /* Tries to copy block <blk> at once into buffer <buf> after length controls.
  * The ->o and to_forward pointers are updated. If the buffer's input is
  * closed, -2 is returned. If the block is too large for this buffer, -3 is
  * returned. If there is not enough room left in the buffer, -1 is returned.
  * Otherwise the number of bytes copied is returned (0 being a valid number).
  * Buffer flags FULL, EMPTY and READ_PARTIAL are updated if some data can be
  * transferred.
  */
 int bi_putblk(struct channel *buf, const char *blk, int len)
 {
 	int max;

 	if (unlikely(buffer_input_closed(buf)))
 		return -2;

 	max = buffer_max_len(buf);
 	if (unlikely(len > max - buffer_len(&buf->buf))) {
 		/* we can't write this chunk right now because the buffer is
 		 * almost full or because the block is too large. Return the
 		 * available space or -2 if impossible.
 		 */
 		if (len > max)
 			return -3;

 		return -1;
 	}

 	if (unlikely(len == 0))
 		return 0;

 	/* OK so the data fits in the buffer in one or two blocks */
 	max = buffer_contig_space_with_res(&buf->buf, buf->buf.size - max);
 	memcpy(bi_end(&buf->buf), blk, MIN(len, max));
 	if (len > max)
 		memcpy(buf->buf.data, blk + max, len - max);

 	buf->buf.i += len;
 	buf->total += len;
 	if (buf->to_forward) {
 		unsigned long fwd = len;
 		if (buf->to_forward != BUF_INFINITE_FORWARD) {
 			if (fwd > buf->to_forward)
 				fwd = buf->to_forward;
 			buf->to_forward -= fwd;
 		}
 		b_adv(buf, fwd);
 	}

 	buf->flags &= ~BF_FULL;
 	if (bi_full(buf))
 		buf->flags |= BF_FULL;

 	/* notify that some data was read from the SI into the buffer */
 	buf->flags |= BF_READ_PARTIAL;
 	return len;
 }

 /* Gets one text line out of a buffer from a stream interface.
  * Return values :
  *   >0 : number of bytes read. Includes the \n if present before len or end.
  *   =0 : no '\n' before end found. <str> is left undefined.
  *   <0 : no more bytes readable because output is shut.
  * The buffer status is not changed. The caller must call bo_skip() to
  * update it. The '\n' is waited for as long as neither the buffer nor the
  * output are full. If either of them is full, the string may be returned
  * as is, without the '\n'.
  */
 int bo_getline(struct channel *buf, char *str, int len)
 {
 	int ret, max;
 	char *p;

 	ret = 0;
 	max = len;

 	/* closed or empty + imminent close = -1; empty = 0 */
 	if (unlikely(buf->flags & (BF_OUT_EMPTY|BF_SHUTW))) {
 		if (buf->flags & (BF_SHUTW|BF_SHUTW_NOW))
 			ret = -1;
 		goto out;
 	}

 	p = bo_ptr(&buf->buf);

 	if (max > buf->buf.o) {
 		max = buf->buf.o;
 		str[max-1] = 0;
 	}
 	while (max) {
 		*str++ = *p;
 		ret++;
 		max--;

 		if (*p == '\n')
 			break;
 		p = buffer_wrap_add(&buf->buf, p + 1);
 	}
 	if (ret > 0 && ret < len && ret < buf->buf.o &&
 	    *(str-1) != '\n' &&
 	    !(buf->flags & (BF_SHUTW|BF_SHUTW_NOW)))
 		ret = 0;
  out:
 	if (max)
 		*str = 0;
 	return ret;
 }

 /* Gets one full block of data at once from a buffer, optionally from a
  * specific offset. Return values :
  *   >0 : number of bytes read, equal to requested size.
  *   =0 : not enough data available. <blk> is left undefined.
  *   <0 : no more bytes readable because output is shut.
  * The buffer status is not changed. The caller must call bo_skip() to
  * update it.
  */
 int bo_getblk(struct channel *buf, char *blk, int len, int offset)
 {
 	int firstblock;

 	if (buf->flags & BF_SHUTW)
 		return -1;

 	if (len + offset > buf->buf.o) {
 		if (buf->flags & (BF_SHUTW|BF_SHUTW_NOW))
 			return -1;
 		return 0;
 	}

 	firstblock = buf->buf.data + buf->buf.size - bo_ptr(&buf->buf);
 	if (firstblock > offset) {
 		if (firstblock >= len + offset) {
 			memcpy(blk, bo_ptr(&buf->buf) + offset, len);
 			return len;
 		}

 		memcpy(blk, bo_ptr(&buf->buf) + offset, firstblock - offset);
 		memcpy(blk + firstblock - offset, buf->buf.data, len - firstblock + offset);
 		return len;
 	}

 	memcpy(blk, buf->buf.data + offset - firstblock, len);
 	return len;
 }

 /* This function writes the string <str> at position <pos> which must be in
  * buffer <b>, and moves <end> just after the end of <str>. <b>'s parameters
  * <l> and <r> are updated to be valid after the shift. The shift value
  * (positive or negative) is returned. If there's no space left, the move is
  * not done. The function does not adjust ->o nor BF_OUT_EMPTY because it
  * does not make sense to use it on data scheduled to be sent. For the same
  * reason, it does not make sense to call this function on unparsed data, so
  * <orig> is not updated. The string length is taken from parameter <len>. If
  * <len> is null, the <str> pointer is allowed to be null.
  */
 int buffer_replace2(struct channel *b, char *pos, char *end, const char *str, int len)
 {
 	int delta;

 	delta = len - (end - pos);

 	if (bi_end(&b->buf) + delta >= b->buf.data + b->buf.size)
 		return 0;  /* no space left */

 	if (buffer_not_empty(&b->buf) &&
 	    bi_end(&b->buf) + delta > bo_ptr(&b->buf) &&
 	    bo_ptr(&b->buf) >= bi_end(&b->buf))
 		return 0;  /* no space left before wrapping data */

 	/* first, protect the end of the buffer */
 	memmove(end + delta, end, bi_end(&b->buf) - end);

 	/* now, copy str over pos */
 	if (len)
 		memcpy(pos, str, len);

 	b->buf.i += delta;

 	b->flags &= ~BF_FULL;
 	if (buffer_len(&b->buf) == 0)
 		b->buf.p = b->buf.data;
 	if (bi_full(b))
 		b->flags |= BF_FULL;

 	return delta;
 }

 /*
  * Inserts <str> followed by "\r\n" at position <pos> in buffer <b>. The <len>
  * argument informs about the length of string <str> so that we don't have to
  * measure it. It does not include the "\r\n". If <str> is NULL, then the buffer
  * is only opened for len+2 bytes but nothing is copied in. It may be useful in
  * some circumstances. The send limit is *not* adjusted. Same comments as above
  * for the valid use cases.
  *
  * The number of bytes added is returned on success. 0 is returned on failure.
  */
 int buffer_insert_line2(struct channel *b, char *pos, const char *str, int len)
 {
 	int delta;

 	delta = len + 2;

 	if (bi_end(&b->buf) + delta >= b->buf.data + b->buf.size)
 		return 0;  /* no space left */

 	/* first, protect the end of the buffer */
 	memmove(pos + delta, pos, bi_end(&b->buf) - pos);

 	/* now, copy str over pos */
 	if (len && str) {
 		memcpy(pos, str, len);
 		pos[len] = '\r';
 		pos[len + 1] = '\n';
 	}

 	b->buf.i += delta;

 	b->flags &= ~BF_FULL;
 	if (bi_full(b))
 		b->flags |= BF_FULL;

 	return delta;
 }

 /*
  * Local variables:
  *  c-indent-level: 8
  *  c-basic-offset: 8
  * End:
  */
	/*
	* Channel management functions.
	*
	* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*
	*/

	#include <ctype.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <string.h>

	#include <common/config.h>
	#include <common/memory.h>
	#include <common/buffer.h>
	#include <proto/channel.h>
	#include <types/global.h>


	/* Note: this code has not yet been completely cleaned up and still refers to
	* the word "buffer" when "channel" is meant instead.
	*/
	struct pool_head *pool2_buffer;


	/* perform minimal intializations, report 0 in case of error, 1 if OK. */
	int init_buffer()
	{
	pool2_buffer = create_pool("buffer", sizeof(struct channel) + global.tune.bufsize, MEM_F_SHARED);
	return pool2_buffer != NULL;
	}

	/* Schedule up to <bytes> more bytes to be forwarded by the buffer without notifying
	* the task. Any pending data in the buffer is scheduled to be sent as well,
	* in the limit of the number of bytes to forward. This must be the only method
	* to use to schedule bytes to be sent. If the requested number is too large, it
	* is automatically adjusted. The number of bytes taken into account is returned.
	* Directly touching ->to_forward will cause lockups when ->o goes down to
	* zero if nobody is ready to push the remaining data.
	*/
	unsigned long long buffer_forward(struct channel *buf, unsigned long long bytes)
	{
	unsigned int new_forward;
	unsigned int forwarded;
	unsigned int bytes32;

	bytes32 = bytes;

	/* hint: avoid comparisons on long long for the fast case, since if the
	* length does not fit in an unsigned it, it will never be forwarded at
	* once anyway.
	*/
	if (bytes <= ~0U) {
	if (bytes32 <= buf->buf.i) {
	/* OK this amount of bytes might be forwarded at once */
	if (!bytes32)
	return 0;
	b_adv(buf, bytes32);
	return bytes;
	}
	}

	forwarded = buf->buf.i;
	b_adv(buf, buf->buf.i);

	/* Note: the case below is the only case where we may return
	* a byte count that does not fit into a 32-bit number.
	*/
	if (likely(buf->to_forward == BUF_INFINITE_FORWARD))
	return bytes;

	if (likely(bytes == BUF_INFINITE_FORWARD)) {
	buf->to_forward = bytes;
	return bytes;
	}

	new_forward = buf->to_forward + bytes - forwarded;
	bytes = forwarded; /* at least those bytes were scheduled */

	if (new_forward <= buf->to_forward) {
	/* integer overflow detected, let's assume no more than 2G at once */
	new_forward = MID_RANGE(new_forward);
	}

	if (new_forward > buf->to_forward) {
	bytes += new_forward - buf->to_forward;
	buf->to_forward = new_forward;
	}
	return bytes;
	}

	/* writes <len> bytes from message <msg> to buffer <buf>. Returns -1 in case of
	* success, -2 if the message is larger than the buffer size, or the number of
	* bytes available otherwise. The send limit is automatically adjusted with the
	* amount of data written. FIXME-20060521: handle unaligned data.
	* Note: this function appends data to the buffer's output and possibly overwrites
	* any pending input data which are assumed not to exist.
	*/
	int bo_inject(struct channel buf, const char msg, int len)
	{
	int max;

	if (len == 0)
	return -1;

	if (len > buf->buf.size) {
	/* we can't write this chunk and will never be able to, because
	* it is larger than the buffer. This must be reported as an
	* error. Then we return -2 so that writers that don't care can
	* ignore it and go on, and others can check for this value.
	*/
	return -2;
	}

	max = buffer_realign(&buf->buf);

	if (len > max)
	return max;

	memcpy(buf->buf.p, msg, len);
	buf->buf.o += len;
	buf->buf.p = b_ptr(&buf->buf, len);
	buf->total += len;

	buf->flags &= ~(BF_OUT_EMPTY\|BF_FULL);
	if (bi_full(buf))
	buf->flags \|= BF_FULL;

	return -1;
	}

	/* Tries to copy character <c> into buffer <buf> after length controls. The
	* ->o and to_forward pointers are updated. If the buffer's input is
	* closed, -2 is returned. If there is not enough room left in the buffer, -1
	* is returned. Otherwise the number of bytes copied is returned (1). Buffer
	* flags FULL, EMPTY and READ_PARTIAL are updated if some data can be
	* transferred.
	*/
	int bi_putchr(struct channel *buf, char c)
	{
	if (unlikely(buffer_input_closed(buf)))
	return -2;

	if (buf->flags & BF_FULL)
	return -1;

	*bi_end(&buf->buf) = c;

	buf->buf.i++;
	if (bi_full(buf))
	buf->flags \|= BF_FULL;
	buf->flags \|= BF_READ_PARTIAL;

	if (buf->to_forward >= 1) {
	if (buf->to_forward != BUF_INFINITE_FORWARD)
	buf->to_forward--;
	b_adv(buf, 1);
	}

	buf->total++;
	return 1;
	}

	/* Tries to copy block <blk> at once into buffer <buf> after length controls.
	* The ->o and to_forward pointers are updated. If the buffer's input is
	* closed, -2 is returned. If the block is too large for this buffer, -3 is
	* returned. If there is not enough room left in the buffer, -1 is returned.
	* Otherwise the number of bytes copied is returned (0 being a valid number).
	* Buffer flags FULL, EMPTY and READ_PARTIAL are updated if some data can be
	* transferred.
	*/
	int bi_putblk(struct channel buf, const char blk, int len)
	{
	int max;

	if (unlikely(buffer_input_closed(buf)))
	return -2;

	max = buffer_max_len(buf);
	if (unlikely(len > max - buffer_len(&buf->buf))) {
	/* we can't write this chunk right now because the buffer is
	* almost full or because the block is too large. Return the
	* available space or -2 if impossible.
	*/
	if (len > max)
	return -3;

	return -1;
	}

	if (unlikely(len == 0))
	return 0;

	/* OK so the data fits in the buffer in one or two blocks */
	max = buffer_contig_space_with_res(&buf->buf, buf->buf.size - max);
	memcpy(bi_end(&buf->buf), blk, MIN(len, max));
	if (len > max)
	memcpy(buf->buf.data, blk + max, len - max);

	buf->buf.i += len;
	buf->total += len;
	if (buf->to_forward) {
	unsigned long fwd = len;
	if (buf->to_forward != BUF_INFINITE_FORWARD) {
	if (fwd > buf->to_forward)
	fwd = buf->to_forward;
	buf->to_forward -= fwd;
	}
	b_adv(buf, fwd);
	}

	buf->flags &= ~BF_FULL;
	if (bi_full(buf))
	buf->flags \|= BF_FULL;

	/* notify that some data was read from the SI into the buffer */
	buf->flags \|= BF_READ_PARTIAL;
	return len;
	}

	/* Gets one text line out of a buffer from a stream interface.
	* Return values :
	* >0 : number of bytes read. Includes the \n if present before len or end.
	* =0 : no '\n' before end found. <str> is left undefined.
	* <0 : no more bytes readable because output is shut.
	* The buffer status is not changed. The caller must call bo_skip() to
	* update it. The '\n' is waited for as long as neither the buffer nor the
	* output are full. If either of them is full, the string may be returned
	* as is, without the '\n'.
	*/
	int bo_getline(struct channel buf, char str, int len)
	{
	int ret, max;
	char *p;

	ret = 0;
	max = len;

	/* closed or empty + imminent close = -1; empty = 0 */
	if (unlikely(buf->flags & (BF_OUT_EMPTY\|BF_SHUTW))) {
	if (buf->flags & (BF_SHUTW\|BF_SHUTW_NOW))
	ret = -1;
	goto out;
	}

	p = bo_ptr(&buf->buf);

	if (max > buf->buf.o) {
	max = buf->buf.o;
	str[max-1] = 0;
	}
	while (max) {
	str++ = p;
	ret++;
	max--;

	if (*p == '\n')
	break;
	p = buffer_wrap_add(&buf->buf, p + 1);
	}
	if (ret > 0 && ret < len && ret < buf->buf.o &&
	*(str-1) != '\n' &&
	!(buf->flags & (BF_SHUTW\|BF_SHUTW_NOW)))
	ret = 0;
	out:
	if (max)
	*str = 0;
	return ret;
	}

	/* Gets one full block of data at once from a buffer, optionally from a
	* specific offset. Return values :
	* >0 : number of bytes read, equal to requested size.
	* =0 : not enough data available. <blk> is left undefined.
	* <0 : no more bytes readable because output is shut.
	* The buffer status is not changed. The caller must call bo_skip() to
	* update it.
	*/
	int bo_getblk(struct channel buf, char blk, int len, int offset)
	{
	int firstblock;

	if (buf->flags & BF_SHUTW)
	return -1;

	if (len + offset > buf->buf.o) {
	if (buf->flags & (BF_SHUTW\|BF_SHUTW_NOW))
	return -1;
	return 0;
	}

	firstblock = buf->buf.data + buf->buf.size - bo_ptr(&buf->buf);
	if (firstblock > offset) {
	if (firstblock >= len + offset) {
	memcpy(blk, bo_ptr(&buf->buf) + offset, len);
	return len;
	}

	memcpy(blk, bo_ptr(&buf->buf) + offset, firstblock - offset);
	memcpy(blk + firstblock - offset, buf->buf.data, len - firstblock + offset);
	return len;
	}

	memcpy(blk, buf->buf.data + offset - firstblock, len);
	return len;
	}

	/* This function writes the string <str> at position <pos> which must be in
	* buffer <b>, and moves <end> just after the end of <str>. <b>'s parameters
	* <l> and <r> are updated to be valid after the shift. The shift value
	* (positive or negative) is returned. If there's no space left, the move is
	* not done. The function does not adjust ->o nor BF_OUT_EMPTY because it
	* does not make sense to use it on data scheduled to be sent. For the same
	* reason, it does not make sense to call this function on unparsed data, so
	* <orig> is not updated. The string length is taken from parameter <len>. If
	* <len> is null, the <str> pointer is allowed to be null.
	*/
	int buffer_replace2(struct channel b, char pos, char end, const char str, int len)
	{
	int delta;

	delta = len - (end - pos);

	if (bi_end(&b->buf) + delta >= b->buf.data + b->buf.size)
	return 0; /* no space left */

	if (buffer_not_empty(&b->buf) &&
	bi_end(&b->buf) + delta > bo_ptr(&b->buf) &&
	bo_ptr(&b->buf) >= bi_end(&b->buf))
	return 0; /* no space left before wrapping data */

	/* first, protect the end of the buffer */
	memmove(end + delta, end, bi_end(&b->buf) - end);

	/* now, copy str over pos */
	if (len)
	memcpy(pos, str, len);

	b->buf.i += delta;

	b->flags &= ~BF_FULL;
	if (buffer_len(&b->buf) == 0)
	b->buf.p = b->buf.data;
	if (bi_full(b))
	b->flags \|= BF_FULL;

	return delta;
	}

	/*
	* Inserts <str> followed by "\r\n" at position <pos> in buffer <b>. The <len>
	* argument informs about the length of string <str> so that we don't have to
	* measure it. It does not include the "\r\n". If <str> is NULL, then the buffer
	* is only opened for len+2 bytes but nothing is copied in. It may be useful in
	* some circumstances. The send limit is not adjusted. Same comments as above
	* for the valid use cases.
	*
	* The number of bytes added is returned on success. 0 is returned on failure.
	*/
	int buffer_insert_line2(struct channel b, char pos, const char *str, int len)
	{
	int delta;

	delta = len + 2;

	if (bi_end(&b->buf) + delta >= b->buf.data + b->buf.size)
	return 0; /* no space left */

	/* first, protect the end of the buffer */
	memmove(pos + delta, pos, bi_end(&b->buf) - pos);

	/* now, copy str over pos */
	if (len && str) {
	memcpy(pos, str, len);
	pos[len] = '\r';
	pos[len + 1] = '\n';
	}

	b->buf.i += delta;

	b->flags &= ~BF_FULL;
	if (bi_full(b))
	b->flags \|= BF_FULL;

	return delta;
	}

	/*
	* Local variables:
	* c-indent-level: 8
	* c-basic-offset: 8
	* End:
	*/