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