cmd-save-buffer.c revision 1.38 
1/* $OpenBSD: cmd-save-buffer.c,v 1.38 2016/10/10 21:51:39 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 cmd_q *);
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 = 0,
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 = 0,
56	.exec = cmd_save_buffer_exec
57};
58
59static enum cmd_retval
60cmd_save_buffer_exec(struct cmd *self, struct cmd_q *cmdq)
61{
62	struct args		*args = self->args;
63	struct client		*c = cmdq->client;
64	struct session          *s;
65	struct paste_buffer	*pb;
66	const char		*path, *bufname, *bufdata, *start, *end, *cwd;
67	const char		*flags;
68	char			*msg, *file, resolved[PATH_MAX];
69	size_t			 size, used, msglen, bufsize;
70	FILE			*f;
71
72	if (!args_has(args, 'b')) {
73		if ((pb = paste_get_top(NULL)) == NULL) {
74			cmdq_error(cmdq, "no buffers");
75			return (CMD_RETURN_ERROR);
76		}
77	} else {
78		bufname = args_get(args, 'b');
79		pb = paste_get_name(bufname);
80		if (pb == NULL) {
81			cmdq_error(cmdq, "no buffer %s", bufname);
82			return (CMD_RETURN_ERROR);
83		}
84	}
85	bufdata = paste_buffer_data(pb, &bufsize);
86
87	if (self->entry == &cmd_show_buffer_entry)
88		path = "-";
89	else
90		path = args->argv[0];
91	if (strcmp(path, "-") == 0) {
92		if (c == NULL) {
93			cmdq_error(cmdq, "can't write to stdout");
94			return (CMD_RETURN_ERROR);
95		}
96		if (c->session == NULL || (c->flags & CLIENT_CONTROL))
97			goto do_stdout;
98		goto do_print;
99	}
100
101	if (c != NULL && c->session == NULL && c->cwd != NULL)
102		cwd = c->cwd;
103	else if ((s = c->session) != NULL && s->cwd != NULL)
104		cwd = s->cwd;
105	else
106		cwd = ".";
107
108	flags = "wb";
109	if (args_has(self->args, 'a'))
110		flags = "ab";
111
112	if (*path == '/')
113		file = xstrdup(path);
114	else
115		xasprintf(&file, "%s/%s", cwd, path);
116	if (realpath(file, resolved) == NULL &&
117	    strlcpy(resolved, file, sizeof resolved) >= sizeof resolved) {
118		cmdq_error(cmdq, "%s: %s", file, strerror(ENAMETOOLONG));
119		return (CMD_RETURN_ERROR);
120	}
121	f = fopen(resolved, flags);
122	free(file);
123	if (f == NULL) {
124		cmdq_error(cmdq, "%s: %s", resolved, strerror(errno));
125		return (CMD_RETURN_ERROR);
126	}
127
128	if (fwrite(bufdata, 1, bufsize, f) != bufsize) {
129		cmdq_error(cmdq, "%s: write error", resolved);
130		fclose(f);
131		return (CMD_RETURN_ERROR);
132	}
133	fclose(f);
134
135	return (CMD_RETURN_NORMAL);
136
137do_stdout:
138	evbuffer_add(c->stdout_data, bufdata, bufsize);
139	server_client_push_stdout(c);
140	return (CMD_RETURN_NORMAL);
141
142do_print:
143	if (bufsize > (INT_MAX / 4) - 1) {
144		cmdq_error(cmdq, "buffer too big");
145		return (CMD_RETURN_ERROR);
146	}
147	msg = NULL;
148
149	used = 0;
150	while (used != bufsize) {
151		start = bufdata + used;
152		end = memchr(start, '\n', bufsize - used);
153		if (end != NULL)
154			size = end - start;
155		else
156			size = bufsize - used;
157
158		msglen = size * 4 + 1;
159		msg = xrealloc(msg, msglen);
160
161		strvisx(msg, start, size, VIS_OCTAL|VIS_TAB);
162		cmdq_print(cmdq, "%s", msg);
163
164		used += size + (end != NULL);
165	}
166
167	free(msg);
168	return (CMD_RETURN_NORMAL);
169}
170