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Change from a per-session stack of buffers to one global stack which is
much more convenient and also simplifies lot of code. This renders
copy-buffer useless and makes buffer-limit now a server option.

By Tiago Cunha.

/* $OpenBSD: cmd-save-buffer.c,v 1.9 2010/12/30 23:16:18 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 *
 * 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 <sys/stat.h>

#include <errno.h>
#include <string.h>

#include "tmux.h"

/*
 * Saves a session paste buffer to a file.
 */

int	cmd_save_buffer_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_save_buffer_entry = {
	"save-buffer", "saveb",
	"[-a] " CMD_BUFFER_USAGE " path",
	CMD_ARG1, "a",
	cmd_buffer_init,
	cmd_buffer_parse,
	cmd_save_buffer_exec,
	cmd_buffer_free,
	cmd_buffer_print
};

int
cmd_save_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_buffer_data	*data = self->data;
	struct paste_buffer	*pb;
	mode_t			 mask;
	FILE			*f;

	if (data->buffer == -1) {
		if ((pb = paste_get_top(&global_buffers)) == NULL) {
			ctx->error(ctx, "no buffers");
			return (-1);
		}
	} else {
		pb = paste_get_index(&global_buffers, data->buffer);
		if (pb == NULL) {
			ctx->error(ctx, "no buffer %d", data->buffer);
			return (-1);
		}
	}

	if (strcmp(data->arg, "-") == 0) {
		if (ctx->cmdclient == NULL) {
			ctx->error(ctx, "%s: can't write to stdout", data->arg);
			return (-1);
		}
		bufferevent_write(
		    ctx->cmdclient->stdout_event, pb->data, pb->size);
	} else {
		mask = umask(S_IRWXG | S_IRWXO);
		if (cmd_check_flag(data->chflags, 'a'))
			f = fopen(data->arg, "ab");
		else
			f = fopen(data->arg, "wb");
		umask(mask);
		if (f == NULL) {
			ctx->error(ctx, "%s: %s", data->arg, strerror(errno));
			return (-1);
		}
		if (fwrite(pb->data, 1, pb->size, f) != pb->size) {
			ctx->error(ctx, "%s: fwrite error", data->arg);
			fclose(f);
			return (-1);
		}
		fclose(f);
	}

	return (0);
}