179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/* Id */
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/*
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* Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <string.h>
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#include "tmux.h"
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/*
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* Environment - manipulate a set of environment variables.
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*/
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RB_GENERATE(environ, environ_entry, entry, environ_cmp);
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int
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environ_cmp(struct environ_entry *envent1, struct environ_entry *envent2)
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{
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return (strcmp(envent1->name, envent2->name));
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}
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/* Initialise the environment. */
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void
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environ_init(struct environ *env)
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{
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RB_INIT(env);
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}
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/* Free an environment. */
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void
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environ_free(struct environ *env)
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{
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struct environ_entry *envent;
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while (!RB_EMPTY(env)) {
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envent = RB_ROOT(env);
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RB_REMOVE(environ, env, envent);
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free(envent->name);
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free(envent->value);
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free(envent);
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}
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}
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/* Copy one environment into another. */
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void
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environ_copy(struct environ *srcenv, struct environ *dstenv)
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{
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struct environ_entry *envent;
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RB_FOREACH(envent, environ, srcenv)
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environ_set(dstenv, envent->name, envent->value);
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}
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/* Find an environment variable. */
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struct environ_entry *
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environ_find(struct environ *env, const char *name)
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{
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struct environ_entry envent;
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envent.name = __UNCONST(name);
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return (RB_FIND(environ, env, &envent));
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}
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/* Set an environment variable. */
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void
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environ_set(struct environ *env, const char *name, const char *value)
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{
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struct environ_entry *envent;
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if ((envent = environ_find(env, name)) != NULL) {
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free(envent->value);
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if (value != NULL)
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envent->value = xstrdup(value);
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else
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envent->value = NULL;
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} else {
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envent = xmalloc(sizeof *envent);
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envent->name = xstrdup(name);
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if (value != NULL)
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envent->value = xstrdup(value);
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else
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envent->value = NULL;
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RB_INSERT(environ, env, envent);
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}
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}
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/* Set an environment variable from a NAME=VALUE string. */
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void
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environ_put(struct environ *env, const char *var)
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{
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char *name, *value;
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value = strchr(var, '=');
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if (value == NULL)
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return;
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value++;
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name = xstrdup(var);
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name[strcspn(name, "=")] = '\0';
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environ_set(env, name, value);
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free(name);
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}
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/* Unset an environment variable. */
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void
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environ_unset(struct environ *env, const char *name)
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{
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struct environ_entry *envent;
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if ((envent = environ_find(env, name)) == NULL)
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return;
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RB_REMOVE(environ, env, envent);
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free(envent->name);
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free(envent->value);
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free(envent);
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}
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/*
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* Copy a space-separated list of variables from a destination into a source
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* environment.
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*/
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void
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environ_update(const char *vars, struct environ *srcenv, struct environ *dstenv)
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{
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struct environ_entry *envent;
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char *copyvars, *var, *next;
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copyvars = next = xstrdup(vars);
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while ((var = strsep(&next, " ")) != NULL) {
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if ((envent = environ_find(srcenv, var)) == NULL)
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environ_set(dstenv, var, NULL);
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else
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environ_set(dstenv, envent->name, envent->value);
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}
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free(copyvars);
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}
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/* Push environment into the real environment - use after fork(). */
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void
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environ_push(struct environ *env)
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{
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ARRAY_DECL(, char *) varlist;
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struct environ_entry *envent;
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char **varp, *var;
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u_int i;
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ARRAY_INIT(&varlist);
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for (varp = environ; *varp != NULL; varp++) {
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var = xstrdup(*varp);
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var[strcspn(var, "=")] = '\0';
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ARRAY_ADD(&varlist, var);
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}
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for (i = 0; i < ARRAY_LENGTH(&varlist); i++)
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unsetenv(ARRAY_ITEM(&varlist, i));
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ARRAY_FREE(&varlist);
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RB_FOREACH(envent, environ, env) {
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if (envent->value != NULL)
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setenv(envent->name, envent->value, 1);
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}
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}
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