1 /* $OpenBSD: cmd-show-environment.c,v 1.28 2021/08/21 10:22:39 nicm Exp $ */
2
3 /*
4 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
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
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include "tmux.h"
25
26 /*
27 * Show environment.
28 */
29
30 static enum cmd_retval cmd_show_environment_exec(struct cmd *,
31 struct cmdq_item *);
32
33 static char *cmd_show_environment_escape(struct environ_entry *);
34 static void cmd_show_environment_print(struct cmd *, struct cmdq_item *,
35 struct environ_entry *);
36
37 const struct cmd_entry cmd_show_environment_entry = {
38 .name = "show-environment",
39 .alias = "showenv",
40
41 .args = { "hgst:", 0, 1, NULL },
42 .usage = "[-hgs] " CMD_TARGET_SESSION_USAGE " [name]",
43
44 .target = { 't', CMD_FIND_SESSION, CMD_FIND_CANFAIL },
45
46 .flags = CMD_AFTERHOOK,
47 .exec = cmd_show_environment_exec
48 };
49
50 static char *
cmd_show_environment_escape(struct environ_entry * envent)51 cmd_show_environment_escape(struct environ_entry *envent)
52 {
53 const char *value = envent->value;
54 char c, *out, *ret;
55
56 out = ret = xmalloc(strlen(value) * 2 + 1); /* at most twice the size */
57 while ((c = *value++) != '\0') {
58 /* POSIX interprets $ ` " and \ in double quotes. */
59 if (c == '$' || c == '`' || c == '"' || c == '\\')
60 *out++ = '\\';
61 *out++ = c;
62 }
63 *out = '\0';
64
65 return (ret);
66 }
67
68 static void
cmd_show_environment_print(struct cmd * self,struct cmdq_item * item,struct environ_entry * envent)69 cmd_show_environment_print(struct cmd *self, struct cmdq_item *item,
70 struct environ_entry *envent)
71 {
72 struct args *args = cmd_get_args(self);
73 char *escaped;
74
75 if (!args_has(args, 'h') && (envent->flags & ENVIRON_HIDDEN))
76 return;
77 if (args_has(args, 'h') && (~envent->flags & ENVIRON_HIDDEN))
78 return;
79
80 if (!args_has(args, 's')) {
81 if (envent->value != NULL)
82 cmdq_print(item, "%s=%s", envent->name, envent->value);
83 else
84 cmdq_print(item, "-%s", envent->name);
85 return;
86 }
87
88 if (envent->value != NULL) {
89 escaped = cmd_show_environment_escape(envent);
90 cmdq_print(item, "%s=\"%s\"; export %s;", envent->name, escaped,
91 envent->name);
92 free(escaped);
93 } else
94 cmdq_print(item, "unset %s;", envent->name);
95 }
96
97 static enum cmd_retval
cmd_show_environment_exec(struct cmd * self,struct cmdq_item * item)98 cmd_show_environment_exec(struct cmd *self, struct cmdq_item *item)
99 {
100 struct args *args = cmd_get_args(self);
101 struct cmd_find_state *target = cmdq_get_target(item);
102 struct environ *env;
103 struct environ_entry *envent;
104 const char *tflag, *name = args_string(args, 0);
105
106 if ((tflag = args_get(args, 't')) != NULL) {
107 if (target->s == NULL) {
108 cmdq_error(item, "no such session: %s", tflag);
109 return (CMD_RETURN_ERROR);
110 }
111 }
112
113 if (args_has(args, 'g'))
114 env = global_environ;
115 else {
116 if (target->s == NULL) {
117 tflag = args_get(args, 't');
118 if (tflag != NULL)
119 cmdq_error(item, "no such session: %s", tflag);
120 else
121 cmdq_error(item, "no current session");
122 return (CMD_RETURN_ERROR);
123 }
124 env = target->s->environ;
125 }
126
127 if (name != NULL) {
128 envent = environ_find(env, name);
129 if (envent == NULL) {
130 cmdq_error(item, "unknown variable: %s", name);
131 return (CMD_RETURN_ERROR);
132 }
133 cmd_show_environment_print(self, item, envent);
134 return (CMD_RETURN_NORMAL);
135 }
136
137 envent = environ_first(env);
138 while (envent != NULL) {
139 cmd_show_environment_print(self, item, envent);
140 envent = environ_next(envent);
141 }
142 return (CMD_RETURN_NORMAL);
143 }
144