external/bsd/tmux/dist/cmd-set-environment.c

   1 /* Id */
   2
   3 /*
   4  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
   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  * Set an environment variable.
  28  */
  29
  30 enum cmd_retval  cmd_set_environment_exec(struct cmd *, struct cmd_q *);
  31
  32 const struct cmd_entry cmd_set_environment_entry = {
  33         "set-environment", "setenv",
  34         "grt:u", 1, 2,
  35         "[-gru] " CMD_TARGET_SESSION_USAGE " name [value]",
  36         0,
  37         NULL,
  38         cmd_set_environment_exec
  39 };
  40
  41 enum cmd_retval
  42 cmd_set_environment_exec(struct cmd *self, struct cmd_q *cmdq)
  43 {
  44         struct args     *args = self->args;
  45         struct session  *s;
  46         struct environ  *env;
  47         const char      *name, *value;
  48
  49         name = args->argv[0];
  50         if (*name == '\0') {
  51                 cmdq_error(cmdq, "empty variable name");
  52                 return (CMD_RETURN_ERROR);
  53         }
  54         if (strchr(name, '=') != NULL) {
  55                 cmdq_error(cmdq, "variable name contains =");
  56                 return (CMD_RETURN_ERROR);
  57         }
  58
  59         if (args->argc < 2)
  60                 value = NULL;
  61         else
  62                 value = args->argv[1];
  63
  64         if (args_has(self->args, 'g'))
  65                 env = &global_environ;
  66         else {
  67                 if ((s = cmd_find_session(cmdq, args_get(args, 't'), 0)) == NULL)
  68                         return (CMD_RETURN_ERROR);
  69                 env = &s->environ;
  70         }
  71
  72         if (args_has(self->args, 'u')) {
  73                 if (value != NULL) {
  74                         cmdq_error(cmdq, "can't specify a value with -u");
  75                         return (CMD_RETURN_ERROR);
  76                 }
  77                 environ_unset(env, name);
  78         } else if (args_has(self->args, 'r')) {
  79                 if (value != NULL) {
  80                         cmdq_error(cmdq, "can't specify a value with -r");
  81                         return (CMD_RETURN_ERROR);
  82                 }
  83                 environ_set(env, name, NULL);
  84         } else {
  85                 if (value == NULL) {
  86                         cmdq_error(cmdq, "no value specified");
  87                         return (CMD_RETURN_ERROR);
  88                 }
  89                 environ_set(env, name, value);
  90         }
  91
  92         return (CMD_RETURN_NORMAL);
  93 }