tmux/environ.c

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/* $OpenBSD$ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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 <unistd.h>
#include "tmux.h"
/*
* Environment - manipulate a set of environment variables.
*/
RB_HEAD(environ, environ_entry);
static int environ_cmp(struct environ_entry *, struct environ_entry *);
RB_GENERATE_STATIC(environ, environ_entry, entry, environ_cmp);
static int
environ_cmp(struct environ_entry *envent1, struct environ_entry *envent2)
{
return (strcmp(envent1->name, envent2->name));
}
/* Initialise the environment. */
struct environ *
environ_create(void)
{
struct environ *env;
env = xcalloc(1, sizeof *env);
RB_INIT(env);
return (env);
}
/* Free an environment. */
void
environ_free(struct environ *env)
{
struct environ_entry *envent, *envent1;
RB_FOREACH_SAFE(envent, environ, env, envent1) {
RB_REMOVE(environ, env, envent);
free(envent->name);
free(envent->value);
free(envent);
}
free(env);
}
struct environ_entry *
environ_first(struct environ *env)
{
return (RB_MIN(environ, env));
}
struct environ_entry *
environ_next(struct environ_entry *envent)
{
return (RB_NEXT(environ, env, envent));
}
/* Copy one environment into another. */
void
environ_copy(struct environ *srcenv, struct environ *dstenv)
{
struct environ_entry *envent;
RB_FOREACH(envent, environ, srcenv) {
if (envent->value == NULL)
environ_clear(dstenv, envent->name);
else {
environ_set(dstenv, envent->name, envent->flags,
"%s", envent->value);
}
}
}
/* Find an environment variable. */
struct environ_entry *
environ_find(struct environ *env, const char *name)
{
struct environ_entry envent;
envent.name = (char *) name;
return (RB_FIND(environ, env, &envent));
}
/* Set an environment variable. */
void
environ_set(struct environ *env, const char *name, int flags, const char *fmt,
...)
{
struct environ_entry *envent;
va_list ap;
va_start(ap, fmt);
if ((envent = environ_find(env, name)) != NULL) {
envent->flags = flags;
free(envent->value);
xvasprintf(&envent->value, fmt, ap);
} else {
envent = xmalloc(sizeof *envent);
envent->name = xstrdup(name);
envent->flags = flags;
xvasprintf(&envent->value, fmt, ap);
RB_INSERT(environ, env, envent);
}
va_end(ap);
}
/* Clear an environment variable. */
void
environ_clear(struct environ *env, const char *name)
{
struct environ_entry *envent;
if ((envent = environ_find(env, name)) != NULL) {
free(envent->value);
envent->value = NULL;
} else {
envent = xmalloc(sizeof *envent);
envent->name = xstrdup(name);
envent->flags = 0;
envent->value = NULL;
RB_INSERT(environ, env, envent);
}
}
/* Set an environment variable from a NAME=VALUE string. */
void
environ_put(struct environ *env, const char *var, int flags)
{
char *name, *value;
value = strchr(var, '=');
if (value == NULL)
return;
value++;
name = xstrdup(var);
name[strcspn(name, "=")] = '\0';
environ_set(env, name, flags, "%s", value);
free(name);
}
/* Unset an environment variable. */
void
environ_unset(struct environ *env, const char *name)
{
struct environ_entry *envent;
if ((envent = environ_find(env, name)) == NULL)
return;
RB_REMOVE(environ, env, envent);
free(envent->name);
free(envent->value);
free(envent);
}
/* Copy variables from a destination into a source environment. */
void
environ_update(struct options *oo, struct environ *src, struct environ *dst)
{
struct environ_entry *envent;
struct options_entry *o;
struct options_array_item *a;
union options_value *ov;
o = options_get(oo, "update-environment");
if (o == NULL)
return;
a = options_array_first(o);
while (a != NULL) {
ov = options_array_item_value(a);
if ((envent = environ_find(src, ov->string)) == NULL)
environ_clear(dst, ov->string);
else
environ_set(dst, envent->name, 0, "%s", envent->value);
a = options_array_next(a);
}
}
/* Push environment into the real environment - use after fork(). */
void
environ_push(struct environ *env)
{
struct environ_entry *envent;
environ = xcalloc(1, sizeof *environ);
RB_FOREACH(envent, environ, env) {
if (envent->value != NULL &&
*envent->name != '\0' &&
(~envent->flags & ENVIRON_HIDDEN))
setenv(envent->name, envent->value, 1);
}
}
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/* Log the environment. */
void
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environ_log(struct environ *env, const char *fmt, ...)
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{
struct environ_entry *envent;
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va_list ap;
char *prefix;
va_start(ap, fmt);
vasprintf(&prefix, fmt, ap);
va_end(ap);
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RB_FOREACH(envent, environ, env) {
if (envent->value != NULL && *envent->name != '\0') {
log_debug("%s%s=%s", prefix, envent->name,
envent->value);
}
}
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free(prefix);
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}
/* Create initial environment for new child. */
struct environ *
environ_for_session(struct session *s, int no_TERM)
{
struct environ *env;
const char *value;
int idx;
env = environ_create();
environ_copy(global_environ, env);
if (s != NULL)
environ_copy(s->environ, env);
if (!no_TERM) {
value = options_get_string(global_options, "default-terminal");
environ_set(env, "TERM", 0, "%s", value);
environ_set(env, "TERM_PROGRAM", 0, "%s", "tmux");
environ_set(env, "TERM_PROGRAM_VERSION", 0, "%s", getversion());
}
if (s != NULL)
idx = s->id;
else
idx = -1;
environ_set(env, "TMUX", 0, "%s,%ld,%d", socket_path, (long)getpid(),
idx);
return (env);
}