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 * 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 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 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