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tmux 2.4

    1: /* $OpenBSD$ */
    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 = { "gst:", 0, 1 },
   42: 	.usage = "[-gs] " CMD_TARGET_SESSION_USAGE " [name]",
   43: 
   44: 	.tflag = CMD_SESSION_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: 	char	*escaped;
   73: 
   74: 	if (!args_has(self->args, 's')) {
   75: 		if (envent->value != NULL)
   76: 			cmdq_print(item, "%s=%s", envent->name, envent->value);
   77: 		else
   78: 			cmdq_print(item, "-%s", envent->name);
   79: 		return;
   80: 	}
   81: 
   82: 	if (envent->value != NULL) {
   83: 		escaped = cmd_show_environment_escape(envent);
   84: 		cmdq_print(item, "%s=\"%s\"; export %s;", envent->name, escaped,
   85: 		    envent->name);
   86: 		free(escaped);
   87: 	} else
   88: 		cmdq_print(item, "unset %s;", envent->name);
   89: }
   90: 
   91: static enum cmd_retval
   92: cmd_show_environment_exec(struct cmd *self, struct cmdq_item *item)
   93: {
   94: 	struct args		*args = self->args;
   95: 	struct environ		*env;
   96: 	struct environ_entry	*envent;
   97: 	const char		*target;
   98: 
   99: 	if ((target = args_get(args, 't')) != NULL) {
  100: 		if (item->state.tflag.s == NULL) {
  101: 			cmdq_error(item, "no such session: %s", target);
  102: 			return (CMD_RETURN_ERROR);
  103: 		}
  104: 	}
  105: 
  106: 	if (args_has(self->args, 'g'))
  107: 		env = global_environ;
  108: 	else {
  109: 		if (item->state.tflag.s == NULL) {
  110: 			target = args_get(args, 't');
  111: 			if (target != NULL)
  112: 				cmdq_error(item, "no such session: %s", target);
  113: 			else
  114: 				cmdq_error(item, "no current session");
  115: 			return (CMD_RETURN_ERROR);
  116: 		}
  117: 		env = item->state.tflag.s->environ;
  118: 	}
  119: 
  120: 	if (args->argc != 0) {
  121: 		envent = environ_find(env, args->argv[0]);
  122: 		if (envent == NULL) {
  123: 			cmdq_error(item, "unknown variable: %s", args->argv[0]);
  124: 			return (CMD_RETURN_ERROR);
  125: 		}
  126: 		cmd_show_environment_print(self, item, envent);
  127: 		return (CMD_RETURN_NORMAL);
  128: 	}
  129: 
  130: 	envent = environ_first(env);
  131: 	while (envent != NULL) {
  132: 		cmd_show_environment_print(self, item, envent);
  133: 		envent = environ_next(envent);
  134: 	}
  135: 	return (CMD_RETURN_NORMAL);
  136: }