cmd-save-buffer.c revision 1.42 
1/* $OpenBSD: cmd-save-buffer.c,v 1.42 2017/02/14 18:13:05 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 = item->client;
64	struct paste_buffer	*pb;
65	const char		*path, *bufname, *bufdata, *start, *end;
66	const char		*flags;
67	char			*msg, *file;
68	size_t			 size, used, msglen, bufsize;
69	FILE			*f;
70
71	if (!args_has(args, 'b')) {
72		if ((pb = paste_get_top(NULL)) == NULL) {
73			cmdq_error(item, "no buffers");
74			return (CMD_RETURN_ERROR);
75		}
76	} else {
77		bufname = args_get(args, 'b');
78		pb = paste_get_name(bufname);
79		if (pb == NULL) {
80			cmdq_error(item, "no buffer %s", bufname);
81			return (CMD_RETURN_ERROR);
82		}
83	}
84	bufdata = paste_buffer_data(pb, &bufsize);
85
86	if (self->entry == &cmd_show_buffer_entry)
87		path = "-";
88	else
89		path = args->argv[0];
90	if (strcmp(path, "-") == 0) {
91		if (c == NULL) {
92			cmdq_error(item, "can't write to stdout");
93			return (CMD_RETURN_ERROR);
94		}
95		if (c->session == NULL || (c->flags & CLIENT_CONTROL))
96			goto do_stdout;
97		goto do_print;
98	}
99
100	flags = "wb";
101	if (args_has(self->args, 'a'))
102		flags = "ab";
103
104	file = server_client_get_path(c, path);
105	f = fopen(file, flags);
106	if (f == NULL) {
107		cmdq_error(item, "%s: %s", file, strerror(errno));
108		free(file);
109		return (CMD_RETURN_ERROR);
110	}
111
112	if (fwrite(bufdata, 1, bufsize, f) != bufsize) {
113		cmdq_error(item, "%s: write error", file);
114		fclose(f);
115		return (CMD_RETURN_ERROR);
116	}
117
118	fclose(f);
119	free(file);
120
121	return (CMD_RETURN_NORMAL);
122
123do_stdout:
124	evbuffer_add(c->stdout_data, bufdata, bufsize);
125	server_client_push_stdout(c);
126	return (CMD_RETURN_NORMAL);
127
128do_print:
129	if (bufsize > (INT_MAX / 4) - 1) {
130		cmdq_error(item, "buffer too big");
131		return (CMD_RETURN_ERROR);
132	}
133	msg = NULL;
134
135	used = 0;
136	while (used != bufsize) {
137		start = bufdata + used;
138		end = memchr(start, '\n', bufsize - used);
139		if (end != NULL)
140			size = end - start;
141		else
142			size = bufsize - used;
143
144		msglen = size * 4 + 1;
145		msg = xrealloc(msg, msglen);
146
147		strvisx(msg, start, size, VIS_OCTAL|VIS_TAB);
148		cmdq_print(item, "%s", msg);
149
150		used += size + (end != NULL);
151	}
152
153	free(msg);
154	return (CMD_RETURN_NORMAL);
155}
156