1 /* $OpenBSD: cmd-show-environment.c,v 1.19 2016/03/03 14:15:22 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 enum cmd_retval cmd_show_environment_exec(struct cmd *, struct cmd_q *); 31 32 char *cmd_show_environment_escape(struct environ_entry *); 33 void cmd_show_environment_print(struct cmd *, struct cmd_q *, 34 struct environ_entry *); 35 36 const struct cmd_entry cmd_show_environment_entry = { 37 .name = "show-environment", 38 .alias = "showenv", 39 40 .args = { "gst:", 0, 1 }, 41 .usage = "[-gs] " CMD_TARGET_SESSION_USAGE " [name]", 42 43 .tflag = CMD_SESSION_CANFAIL, 44 45 .flags = 0, 46 .exec = cmd_show_environment_exec 47 }; 48 49 char * 50 cmd_show_environment_escape(struct environ_entry *envent) 51 { 52 const char *value = envent->value; 53 char c, *out, *ret; 54 55 out = ret = xmalloc(strlen(value) * 2 + 1); /* at most twice the size */ 56 while ((c = *value++) != '\0') { 57 /* POSIX interprets $ ` " and \ in double quotes. */ 58 if (c == '$' || c == '`' || c == '"' || c == '\\') 59 *out++ = '\\'; 60 *out++ = c; 61 } 62 *out = '\0'; 63 64 return (ret); 65 } 66 67 void 68 cmd_show_environment_print(struct cmd *self, struct cmd_q *cmdq, 69 struct environ_entry *envent) 70 { 71 char *escaped; 72 73 if (!args_has(self->args, 's')) { 74 if (envent->value != NULL) 75 cmdq_print(cmdq, "%s=%s", envent->name, envent->value); 76 else 77 cmdq_print(cmdq, "-%s", envent->name); 78 return; 79 } 80 81 if (envent->value != NULL) { 82 escaped = cmd_show_environment_escape(envent); 83 cmdq_print(cmdq, "%s=\"%s\"; export %s;", envent->name, escaped, 84 envent->name); 85 free(escaped); 86 } else 87 cmdq_print(cmdq, "unset %s;", envent->name); 88 } 89 90 enum cmd_retval 91 cmd_show_environment_exec(struct cmd *self, struct cmd_q *cmdq) 92 { 93 struct args *args = self->args; 94 struct environ *env; 95 struct environ_entry *envent; 96 const char *target; 97 98 if ((target = args_get(args, 't')) != NULL) { 99 if (cmdq->state.tflag.s == NULL) { 100 cmdq_error(cmdq, "no such session: %s", target); 101 return (CMD_RETURN_ERROR); 102 } 103 } 104 105 if (args_has(self->args, 'g')) 106 env = global_environ; 107 else { 108 if (cmdq->state.tflag.s == NULL) { 109 target = args_get(args, 't'); 110 if (target != NULL) 111 cmdq_error(cmdq, "no such session: %s", target); 112 else 113 cmdq_error(cmdq, "no current session"); 114 return (CMD_RETURN_ERROR); 115 } 116 env = cmdq->state.tflag.s->environ; 117 } 118 119 if (args->argc != 0) { 120 envent = environ_find(env, args->argv[0]); 121 if (envent == NULL) { 122 cmdq_error(cmdq, "unknown variable: %s", args->argv[0]); 123 return (CMD_RETURN_ERROR); 124 } 125 cmd_show_environment_print(self, cmdq, envent); 126 return (CMD_RETURN_NORMAL); 127 } 128 129 envent = environ_first(env); 130 while (envent != NULL) { 131 cmd_show_environment_print(self, cmdq, envent); 132 envent = environ_next(envent); 133 } 134 return (CMD_RETURN_NORMAL); 135 } 136