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environ.c    180 lines (152 with data), 4.2 kB

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/* $Id$ */
/*
* 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"
/*
* Environment - manipulate a set of environment variables.
*/
RB_GENERATE(environ, environ_entry, entry, environ_cmp);
int
environ_cmp(struct environ_entry *envent1, struct environ_entry *envent2)
{
return (strcmp(envent1->name, envent2->name));
}
/* Initialise the environment. */
void
environ_init(struct environ *env)
{
RB_INIT(env);
}
/* Free an environment. */
void
environ_free(struct environ *env)
{
struct environ_entry *envent;
while (!RB_EMPTY(env)) {
envent = RB_ROOT(env);
RB_REMOVE(environ, env, envent);
free(envent->name);
free(envent->value);
free(envent);
}
}
/* Copy one environment into another. */
void
environ_copy(struct environ *srcenv, struct environ *dstenv)
{
struct environ_entry *envent;
RB_FOREACH(envent, environ, srcenv)
environ_set(dstenv, envent->name, 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, const char *value)
{
struct environ_entry *envent;
if ((envent = environ_find(env, name)) != NULL) {
free(envent->value);
if (value != NULL)
envent->value = xstrdup(value);
else
envent->value = NULL;
} else {
envent = xmalloc(sizeof *envent);
envent->name = xstrdup(name);
if (value != NULL)
envent->value = xstrdup(value);
else
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)
{
char *name, *value;
value = strchr(var, '=');
if (value == NULL)
return;
value++;
name = xstrdup(var);
name[strcspn(name, "=")] = '\0';
environ_set(env, name, 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 a space-separated list of variables from a destination into a source
* environment.
*/
void
environ_update(const char *vars, struct environ *srcenv,
struct environ *dstenv)
{
struct environ_entry *envent;
char *copyvars, *var, *next;
copyvars = next = xstrdup(vars);
while ((var = strsep(&next, " ")) != NULL) {
if ((envent = environ_find(srcenv, var)) == NULL)
environ_set(dstenv, var, NULL);
else
environ_set(dstenv, envent->name, envent->value);
}
free(copyvars);
}
/* Push environment into the real environment - use after fork(). */
void
environ_push(struct environ *env)
{
ARRAY_DECL(, char *) varlist;
struct environ_entry *envent;
char **varp, *var;
u_int i;
ARRAY_INIT(&varlist);
for (varp = environ; *varp != NULL; varp++) {
var = xstrdup(*varp);
var[strcspn(var, "=")] = '\0';
ARRAY_ADD(&varlist, var);
}
for (i = 0; i < ARRAY_LENGTH(&varlist); i++)
unsetenv(ARRAY_ITEM(&varlist, i));
ARRAY_FREE(&varlist);
RB_FOREACH(envent, environ, env) {
if (envent->value != NULL)
setenv(envent->name, envent->value, 1);
}
}