cmd-save-buffer.c revision 1.44 
1/* $OpenBSD: cmd-save-buffer.c,v 1.44 2018/07/11 08:29:21 nicm Exp $ */
2
3/*
4 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/stat.h>
21
22#include <errno.h>
23#include <fcntl.h>
24#include <stdlib.h>
25#include <string.h>
26#include <unistd.h>
27#include <vis.h>
28
29#include "tmux.h"
30
31/*
32 * Saves a paste buffer to a file.
33 */
34
35static enum cmd_retval	cmd_save_buffer_exec(struct cmd *, struct cmdq_item *);
36
37const struct cmd_entry cmd_save_buffer_entry = {
38	.name = "save-buffer",
39	.alias = "saveb",
40
41	.args = { "ab:", 1, 1 },
42	.usage = "[-a] " CMD_BUFFER_USAGE " path",
43
44	.flags = CMD_AFTERHOOK,
45	.exec = cmd_save_buffer_exec
46};
47
48const struct cmd_entry cmd_show_buffer_entry = {
49	.name = "show-buffer",
50	.alias = "showb",
51
52	.args = { "b:", 0, 0 },
53	.usage = CMD_BUFFER_USAGE,
54
55	.flags = CMD_AFTERHOOK,
56	.exec = cmd_save_buffer_exec
57};
58
59static enum cmd_retval
60cmd_save_buffer_exec(struct cmd *self, struct cmdq_item *item)
61{
62	struct args		*args = self->args;
63	struct client		*c = cmd_find_client(item, NULL, 1);
64	struct session		*s = item->target.s;
65	struct winlink		*wl = item->target.wl;
66	struct window_pane	*wp = item->target.wp;
67	struct paste_buffer	*pb;
68	const char		*bufname, *bufdata, *start, *end, *flags;
69	char			*msg, *path, *file;
70	size_t			 size, used, msglen, bufsize;
71	FILE			*f;
72
73	if (!args_has(args, 'b')) {
74		if ((pb = paste_get_top(NULL)) == NULL) {
75			cmdq_error(item, "no buffers");
76			return (CMD_RETURN_ERROR);
77		}
78	} else {
79		bufname = args_get(args, 'b');
80		pb = paste_get_name(bufname);
81		if (pb == NULL) {
82			cmdq_error(item, "no buffer %s", bufname);
83			return (CMD_RETURN_ERROR);
84		}
85	}
86	bufdata = paste_buffer_data(pb, &bufsize);
87
88	if (self->entry == &cmd_show_buffer_entry)
89		path = xstrdup("-");
90	else
91		path = format_single(item, args->argv[0], c, s, wl, wp);
92	if (strcmp(path, "-") == 0) {
93		free(path);
94		c = item->client;
95		if (c == NULL) {
96			cmdq_error(item, "can't write to stdout");
97			return (CMD_RETURN_ERROR);
98		}
99		if (c->session == NULL || (c->flags & CLIENT_CONTROL))
100			goto do_stdout;
101		goto do_print;
102	}
103
104	flags = "wb";
105	if (args_has(self->args, 'a'))
106		flags = "ab";
107
108	file = server_client_get_path(c, path);
109	f = fopen(file, flags);
110	if (f == NULL) {
111		cmdq_error(item, "%s: %s", file, strerror(errno));
112		free(file);
113		return (CMD_RETURN_ERROR);
114	}
115
116	if (fwrite(bufdata, 1, bufsize, f) != bufsize) {
117		cmdq_error(item, "%s: write error", file);
118		fclose(f);
119		free(file);
120		return (CMD_RETURN_ERROR);
121	}
122
123	fclose(f);
124	free(file);
125	free(path);
126
127	return (CMD_RETURN_NORMAL);
128
129do_stdout:
130	evbuffer_add(c->stdout_data, bufdata, bufsize);
131	server_client_push_stdout(c);
132	return (CMD_RETURN_NORMAL);
133
134do_print:
135	if (bufsize > (INT_MAX / 4) - 1) {
136		cmdq_error(item, "buffer too big");
137		return (CMD_RETURN_ERROR);
138	}
139	msg = NULL;
140
141	used = 0;
142	while (used != bufsize) {
143		start = bufdata + used;
144		end = memchr(start, '\n', bufsize - used);
145		if (end != NULL)
146			size = end - start;
147		else
148			size = bufsize - used;
149
150		msglen = size * 4 + 1;
151		msg = xrealloc(msg, msglen);
152
153		strvisx(msg, start, size, VIS_OCTAL|VIS_TAB);
154		cmdq_print(item, "%s", msg);
155
156		used += size + (end != NULL);
157	}
158
159	free(msg);
160	return (CMD_RETURN_NORMAL);
161}
162