mirror of
https://github.com/tmux/tmux.git
synced 2024-10-31 22:58:49 +00:00
143 lines
2.8 KiB
C
143 lines
2.8 KiB
C
/* $OpenBSD$ */
|
|
|
|
/*
|
|
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
|
|
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
|
|
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include "tmux.h"
|
|
|
|
/* Create a buffer. */
|
|
struct buffer *
|
|
buffer_create(size_t size)
|
|
{
|
|
struct buffer *b;
|
|
|
|
if (size == 0)
|
|
fatalx("zero size");
|
|
|
|
b = xcalloc(1, sizeof *b);
|
|
|
|
b->base = xmalloc(size);
|
|
b->space = size;
|
|
|
|
return (b);
|
|
}
|
|
|
|
/* Destroy a buffer. */
|
|
void
|
|
buffer_destroy(struct buffer *b)
|
|
{
|
|
xfree(b->base);
|
|
xfree(b);
|
|
}
|
|
|
|
/* Ensure free space for size in buffer. */
|
|
void
|
|
buffer_ensure(struct buffer *b, size_t size)
|
|
{
|
|
if (size == 0)
|
|
fatalx("zero size");
|
|
|
|
if (BUFFER_FREE(b) >= size)
|
|
return;
|
|
|
|
if (b->off > 0) {
|
|
if (b->size > 0)
|
|
memmove(b->base, b->base + b->off, b->size);
|
|
b->off = 0;
|
|
}
|
|
|
|
if (SIZE_MAX - b->size < size)
|
|
fatalx("size too big");
|
|
while (b->space < b->size + size) {
|
|
b->base = xrealloc(b->base, 2, b->space);
|
|
b->space *= 2;
|
|
}
|
|
}
|
|
|
|
/* Adjust buffer after data appended. */
|
|
void
|
|
buffer_add(struct buffer *b, size_t size)
|
|
{
|
|
if (size == 0)
|
|
fatalx("zero size");
|
|
if (size > b->space - b->size)
|
|
fatalx("overflow");
|
|
|
|
b->size += size;
|
|
}
|
|
|
|
/* Adjust buffer after data removed. */
|
|
void
|
|
buffer_remove(struct buffer *b, size_t size)
|
|
{
|
|
if (size == 0)
|
|
fatalx("zero size");
|
|
if (size > b->size)
|
|
fatalx("underflow");
|
|
|
|
b->size -= size;
|
|
b->off += size;
|
|
}
|
|
|
|
/* Copy data into a buffer. */
|
|
void
|
|
buffer_write(struct buffer *b, const void *data, size_t size)
|
|
{
|
|
if (size == 0)
|
|
fatalx("zero size");
|
|
|
|
buffer_ensure(b, size);
|
|
memcpy(BUFFER_IN(b), data, size);
|
|
buffer_add(b, size);
|
|
}
|
|
|
|
/* Copy data out of a buffer. */
|
|
void
|
|
buffer_read(struct buffer *b, void *data, size_t size)
|
|
{
|
|
if (size == 0)
|
|
fatalx("zero size");
|
|
if (size > b->size)
|
|
fatalx("underflow");
|
|
|
|
memcpy(data, BUFFER_OUT(b), size);
|
|
buffer_remove(b, size);
|
|
}
|
|
|
|
/* Store an 8-bit value. */
|
|
void
|
|
buffer_write8(struct buffer *b, uint8_t n)
|
|
{
|
|
buffer_ensure(b, 1);
|
|
BUFFER_IN(b)[0] = n;
|
|
buffer_add(b, 1);
|
|
}
|
|
|
|
/* Extract an 8-bit value. */
|
|
uint8_t
|
|
buffer_read8(struct buffer *b)
|
|
{
|
|
uint8_t n;
|
|
|
|
n = BUFFER_OUT(b)[0];
|
|
buffer_remove(b, 1);
|
|
return (n);
|
|
}
|