blob: 8b2c4d33eb34ac9f6094563eca08a6264443022c [file] [log] [blame]
/*
* Buffer management functions.
*
* Copyright 2000-2007 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 <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <common/config.h>
#include <common/memory.h>
#include <proto/buffers.h>
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 buffer), MEM_F_SHARED);
return pool2_buffer != NULL;
}
/* writes <len> bytes from message <msg> to buffer <buf>. Returns 0 in case of
* success, or the number of bytes available otherwise.
* FIXME-20060521: handle unaligned data.
*/
int buffer_write(struct buffer *buf, const char *msg, int len)
{
int max;
max = buffer_realign(buf);
if (len > max)
return max;
memcpy(buf->r, msg, len);
buf->l += len;
buf->r += len;
buf->total += len;
if (buf->r == buf->data + BUFSIZE)
buf->r = buf->data;
return 0;
}
/* writes the chunk <chunk> to buffer <buf>. Returns 0 in case of
* success, or the number of bytes available otherwise. If the chunk
* has been written, its size is automatically reset to zero.
*/
int buffer_write_chunk(struct buffer *buf, struct chunk *chunk)
{
int max;
if (chunk->len == 0)
return 0;
max = buffer_realign(buf);
if (chunk->len > max)
return max;
memcpy(buf->r, chunk->str, chunk->len);
buf->l += chunk->len;
buf->r += chunk->len;
buf->total += chunk->len;
if (buf->r == buf->data + BUFSIZE)
buf->r = buf->data;
chunk->len = 0;
return 0;
}
/*
* 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, r, w, h, lr) are recomputed 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.
*
*/
int buffer_replace(struct buffer *b, char *pos, char *end, const char *str)
{
int delta;
int len;
len = strlen(str);
delta = len - (end - pos);
if (delta + b->r >= b->data + BUFSIZE)
return 0; /* no space left */
/* first, protect the end of the buffer */
memmove(end + delta, end, b->data + b->l - end);
/* now, copy str over pos */
memcpy(pos, str,len);
/* we only move data after the displaced zone */
if (b->r > pos) b->r += delta;
if (b->w > pos) b->w += delta;
if (b->lr > pos) b->lr += delta;
b->l += delta;
return delta;
}
/*
* same except that the string length is given, which allows str to be NULL if
* len is 0.
*/
int buffer_replace2(struct buffer *b, char *pos, char *end, const char *str, int len)
{
int delta;
delta = len - (end - pos);
if (delta + b->r >= b->data + BUFSIZE)
return 0; /* no space left */
if (b->data + b->l < end) {
/* The data has been stolen, we could have crashed.
* Maybe we should abort() ? */
return 0;
}
/* first, protect the end of the buffer */
memmove(end + delta, end, b->data + b->l - end);
/* now, copy str over pos */
if (len)
memcpy(pos, str, len);
/* we only move data after the displaced zone */
if (b->r > pos) b->r += delta;
if (b->w > pos) b->w += delta;
if (b->lr > pos) b->lr += delta;
b->l += delta;
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 number of bytes added is returned on success. 0 is returned on failure.
*/
int buffer_insert_line2(struct buffer *b, char *pos, const char *str, int len)
{
int delta;
delta = len + 2;
if (delta + b->r >= b->data + BUFSIZE)
return 0; /* no space left */
/* first, protect the end of the buffer */
memmove(pos + delta, pos, b->data + b->l - pos);
/* now, copy str over pos */
if (len && str) {
memcpy(pos, str, len);
pos[len] = '\r';
pos[len + 1] = '\n';
}
/* we only move data after the displaced zone */
if (b->r > pos) b->r += delta;
if (b->w > pos) b->w += delta;
if (b->lr > pos) b->lr += delta;
b->l += delta;
return delta;
}
/*
* Does an snprintf() at the end of chunk <chk>, respecting the limit of
* at most <size> chars. If the size is over, nothing is added. Returns
* the new chunk size.
*/
int chunk_printf(struct chunk *chk, int size, const char *fmt, ...)
{
va_list argp;
int ret;
va_start(argp, fmt);
ret = vsnprintf(chk->str + chk->len, size - chk->len, fmt, argp);
if (ret >= size - chk->len)
/* do not copy anything in case of truncation */
chk->str[chk->len] = 0;
else
chk->len += ret;
va_end(argp);
return chk->len;
}
/*
* Dumps part or all of a buffer.
*/
void buffer_dump(FILE *o, struct buffer *b, int from, int to)
{
fprintf(o, "Dumping buffer %p\n", b);
fprintf(o, " data=%p l=%d r=%p w=%p lr=%p\n",
b->data, b->l, b->r, b->w, b->lr);
if (!to || to > b->l)
to = b->l;
fprintf(o, "Dumping contents from byte %d to byte %d\n", from, to);
for (; from < to; from++) {
if ((from & 15) == 0)
fprintf(o, " %04x: ", from);
fprintf(o, "%02x ", b->data[from]);
if ((from & 15) == 7)
fprintf(o, "- ");
else if (((from & 15) == 15) && (from != to-1))
fprintf(o, "\n");
}
fprintf(o, "\n--\n");
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/