cmd-save-buffer.c revision 1.29 
1/* $OpenBSD: cmd-save-buffer.c,v 1.29 2015/08/29 09:25:00 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
35enum cmd_retval	 cmd_save_buffer_exec(struct cmd *, struct cmd_q *);
36
37const struct cmd_entry cmd_save_buffer_entry = {
38	"save-buffer", "saveb",
39	"ab:", 1, 1,
40	"[-a] " CMD_BUFFER_USAGE " path",
41	0,
42	cmd_save_buffer_exec
43};
44
45const struct cmd_entry cmd_show_buffer_entry = {
46	"show-buffer", "showb",
47	"b:", 0, 0,
48	CMD_BUFFER_USAGE,
49	0,
50	cmd_save_buffer_exec
51};
52
53enum cmd_retval
54cmd_save_buffer_exec(struct cmd *self, struct cmd_q *cmdq)
55{
56	struct args		*args = self->args;
57	struct client		*c = cmdq->client;
58	struct session          *s;
59	struct paste_buffer	*pb;
60	const char		*path, *bufname, *bufdata;
61	char			*start, *end, *msg;
62	size_t			 size, used, msglen, bufsize;
63	int			 cwd, fd;
64	FILE			*f;
65
66	if (!args_has(args, 'b')) {
67		if ((pb = paste_get_top(NULL)) == NULL) {
68			cmdq_error(cmdq, "no buffers");
69			return (CMD_RETURN_ERROR);
70		}
71	} else {
72		bufname = args_get(args, 'b');
73		pb = paste_get_name(bufname);
74		if (pb == NULL) {
75			cmdq_error(cmdq, "no buffer %s", bufname);
76			return (CMD_RETURN_ERROR);
77		}
78	}
79	bufdata = paste_buffer_data(pb, &bufsize);
80
81	if (self->entry == &cmd_show_buffer_entry)
82		path = "-";
83	else
84		path = args->argv[0];
85	if (strcmp(path, "-") == 0) {
86		if (c == NULL) {
87			cmdq_error(cmdq, "can't write to stdout");
88			return (CMD_RETURN_ERROR);
89		}
90		if (c->session == NULL || (c->flags & CLIENT_CONTROL))
91			goto do_stdout;
92		goto do_print;
93	}
94
95	if (c != NULL && c->session == NULL)
96		cwd = c->cwd;
97	else if ((s = cmd_find_current(cmdq)) != NULL)
98		cwd = s->cwd;
99	else
100		cwd = AT_FDCWD;
101
102	f = NULL;
103	if (args_has(self->args, 'a')) {
104		fd = openat(cwd, path, O_CREAT|O_RDWR|O_APPEND, 0600);
105		if (fd != -1)
106			f = fdopen(fd, "ab");
107	} else {
108		fd = openat(cwd, path, O_CREAT|O_RDWR|O_TRUNC, 0600);
109		if (fd != -1)
110			f = fdopen(fd, "wb");
111	}
112	if (f == NULL) {
113		if (fd != -1)
114			close(fd);
115		cmdq_error(cmdq, "%s: %s", path, strerror(errno));
116		return (CMD_RETURN_ERROR);
117	}
118	if (fwrite(bufdata, 1, bufsize, f) != bufsize) {
119		cmdq_error(cmdq, "%s: fwrite error", path);
120		fclose(f);
121		return (CMD_RETURN_ERROR);
122	}
123	fclose(f);
124
125	return (CMD_RETURN_NORMAL);
126
127do_stdout:
128	evbuffer_add(c->stdout_data, bufdata, bufsize);
129	server_push_stdout(c);
130	return (CMD_RETURN_NORMAL);
131
132do_print:
133	if (bufsize > (INT_MAX / 4) - 1) {
134		cmdq_error(cmdq, "buffer too big");
135		return (CMD_RETURN_ERROR);
136	}
137	msg = NULL;
138
139	used = 0;
140	while (used != bufsize) {
141		start = bufdata + used;
142		end = memchr(start, '\n', bufsize - used);
143		if (end != NULL)
144			size = end - start;
145		else
146			size = bufsize - used;
147
148		msglen = size * 4 + 1;
149		msg = xrealloc(msg, msglen);
150
151		strvisx(msg, start, size, VIS_OCTAL|VIS_TAB);
152		cmdq_print(cmdq, "%s", msg);
153
154		used += size + (end != NULL);
155	}
156
157	free(msg);
158	return (CMD_RETURN_NORMAL);
159}
160