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Some style nits and dead assignments.

/* $OpenBSD: cmd-show-environment.c,v 1.11 2015/08/30 15:43:40 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Show environment.
 */

enum cmd_retval	cmd_show_environment_exec(struct cmd *, struct cmd_q *);

char	*cmd_show_environment_escape(struct environ_entry *);
void	 cmd_show_environment_print(struct cmd *, struct cmd_q *,
	     struct environ_entry *);

const struct cmd_entry cmd_show_environment_entry = {
	"show-environment", "showenv",
	"gst:", 0, 1,
	"[-gs] " CMD_TARGET_SESSION_USAGE " [name]",
	0,
	cmd_show_environment_exec
};

char *
cmd_show_environment_escape(struct environ_entry *envent)
{
	const char	*value = envent->value;
	char		 c, *out, *ret;

	out = ret = xmalloc(strlen(value) * 2 + 1); /* at most twice the size */
	while ((c = *value++) != '\0') {
		/* POSIX interprets $ ` " and \ in double quotes. */
		if (c == '$' || c == '`' || c == '"' || c == '\\')
			*out++ = '\\';
		*out++ = c;
	}
	*out = '\0';

	return (ret);
}

void
cmd_show_environment_print(struct cmd *self, struct cmd_q *cmdq,
    struct environ_entry *envent)
{
	char	*escaped;

	if (!args_has(self->args, 's')) {
		if (envent->value != NULL)
			cmdq_print(cmdq, "%s=%s", envent->name, envent->value);
		else
			cmdq_print(cmdq, "-%s", envent->name);
		return;
	}

	if (envent->value != NULL) {
		escaped = cmd_show_environment_escape(envent);
		cmdq_print(cmdq, "%s=\"%s\"; export %s;", envent->name, escaped,
		    envent->name);
		free(escaped);
	} else
		cmdq_print(cmdq, "unset %s;", envent->name);
}

enum cmd_retval
cmd_show_environment_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct session		*s;
	struct environ		*env;
	struct environ_entry	*envent;

	if (args_has(self->args, 'g'))
		env = &global_environ;
	else {
		s = cmd_find_session(cmdq, args_get(args, 't'), 0);
		if (s == NULL)
			return (CMD_RETURN_ERROR);
		env = &s->environ;
	}

	if (args->argc != 0) {
		envent = environ_find(env, args->argv[0]);
		if (envent == NULL) {
			cmdq_error(cmdq, "unknown variable: %s", args->argv[0]);
			return (CMD_RETURN_ERROR);
		}
		cmd_show_environment_print(self, cmdq, envent);
		return (CMD_RETURN_NORMAL);
	}

	RB_FOREACH(envent, environ, env)
		cmd_show_environment_print(self, cmdq, envent);
	return (CMD_RETURN_NORMAL);
}