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Rewrite the code for reading and writing files. Now, if the client is
not attached, the server process asks it to open the file, similar to
how works for stdin, stdout, stderr. This makes special files like
/dev/fd/X work (used by some shells). stdin, stdout and stderr and
control mode are now just special cases of the same mechanism. This will
also make it easier to use for other commands that read files such as
source-file.

/* $OpenBSD: cmd-load-buffer.c,v 1.57 2019/12/12 11:39:56 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 <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Loads a paste buffer from a file.
 */

static enum cmd_retval	cmd_load_buffer_exec(struct cmd *, struct cmdq_item *);

const struct cmd_entry cmd_load_buffer_entry = {
	.name = "load-buffer",
	.alias = "loadb",

	.args = { "b:", 1, 1 },
	.usage = CMD_BUFFER_USAGE " path",

	.flags = CMD_AFTERHOOK,
	.exec = cmd_load_buffer_exec
};

struct cmd_load_buffer_data {
	struct cmdq_item	*item;
	char			*name;
};

static void
cmd_load_buffer_done(__unused struct client *c, const char *path, int error,
    int closed, struct evbuffer *buffer, void *data)
{
	struct cmd_load_buffer_data	*cdata = data;
	struct cmdq_item		*item = cdata->item;
	void				*bdata = EVBUFFER_DATA(buffer);
	size_t				 bsize = EVBUFFER_LENGTH(buffer);
	void				*copy;
	char				*cause;

	if (!closed)
		return;

	if (error != 0)
		cmdq_error(item, "%s: %s", path, strerror(error));
	else if (bsize != 0) {
		copy = xmalloc(bsize);
		memcpy(copy, bdata, bsize);
		if (paste_set(copy, bsize, cdata->name, &cause) != 0) {
			cmdq_error(item, "%s", cause);
			free(cause);
			free(copy);
		}
	}
	cmdq_continue(item);

	free(cdata->name);
	free(cdata);
}

static enum cmd_retval
cmd_load_buffer_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args			*args = self->args;
	struct cmd_load_buffer_data	*cdata;
	struct client			*c = cmd_find_client(item, NULL, 1);
	struct session			*s = item->target.s;
	struct winlink			*wl = item->target.wl;
	struct window_pane		*wp = item->target.wp;
	const char			*bufname = args_get(args, 'b');
	char				*path;

	cdata = xmalloc(sizeof *cdata);
	cdata->item = item;
	if (bufname != NULL)
		cdata->name = xstrdup(bufname);
	else
		cdata->name = NULL;

	path = format_single(item, args->argv[0], c, s, wl, wp);
	file_read(item->client, path, cmd_load_buffer_done, cdata);
	free(path);

	return (CMD_RETURN_WAIT);
}