45 	struct env_var	*ev;  in env_getenv()  local
47 	for (ev = environ; ev != NULL; ev = ev->ev_next)  in env_getenv()
48 		if (!strcmp(ev->ev_name, name))  in env_getenv()
50 	return (ev);  in env_getenv()
65 	struct env_var	*ev, *curr, *last;  in env_setenv()  local
67 	if ((ev = env_getenv(name)) != NULL) {  in env_setenv()
77 			ev->ev_flags &= ~EV_NOKENV;  in env_setenv()
83 		if ((ev->ev_sethook != NULL) && !(flags & EV_NOHOOK))  in env_setenv()
84 			return (ev->ev_sethook(ev, flags, value));  in env_setenv()
87 		if (ev->ev_value != NULL && (ev->ev_flags & EV_DYNAMIC) != 0)  in env_setenv()
88 			free(ev->ev_value);  in env_setenv()
89 		ev->ev_value = NULL;  in env_setenv()
90 		ev->ev_flags &= ~EV_DYNAMIC;  in env_setenv()
96 		ev = malloc(sizeof(struct env_var));  in env_setenv()
97 		ev->ev_name = strdup(name);  in env_setenv()
98 		ev->ev_value = NULL;  in env_setenv()
99 		ev->ev_flags = 0;  in env_setenv()
101 		ev->ev_sethook = sethook;  in env_setenv()
102 		ev->ev_unsethook = unsethook;  in env_setenv()
105 		ev->ev_prev = NULL;  in env_setenv()
106 		ev->ev_next = NULL;  in env_setenv()
111 			if (strcmp(ev->ev_name, curr->ev_name) < 0) {  in env_setenv()
113 					curr->ev_prev->ev_next = ev;  in env_setenv()
115 					environ = ev;  in env_setenv()
117 				ev->ev_next = curr;  in env_setenv()
118 				ev->ev_prev = curr->ev_prev;  in env_setenv()
119 				curr->ev_prev = ev;  in env_setenv()
125 				environ = ev;  in env_setenv()
127 				last->ev_next = ev;  in env_setenv()
128 				ev->ev_prev = last;  in env_setenv()
135 		ev->ev_value = strdup(value);  in env_setenv()
138 		ev->ev_value = (char *)value;  in env_setenv()
141 	ev->ev_flags |= flags & (EV_DYNAMIC | EV_NOKENV);  in env_setenv()
150 	struct env_var	*ev;  in getenv()  local
153 	if ((ev = env_getenv(name)) != NULL) {  in getenv()
154 		if (ev->ev_value != NULL)  in getenv()
155 			return (ev->ev_value);  in getenv()
187 	struct env_var	*ev;  in unsetenv()  local
191 	if ((ev = env_getenv(name)) == NULL) {  in unsetenv()
194 		if (ev->ev_unsethook != NULL)  in unsetenv()
195 			err = ev->ev_unsethook(ev);  in unsetenv()
197 			env_discard(ev);  in unsetenv()
204 env_discard(struct env_var *ev)  in env_discard()  argument
206 	if (ev->ev_prev)  in env_discard()
207 		ev->ev_prev->ev_next = ev->ev_next;  in env_discard()
208 	if (ev->ev_next)  in env_discard()
209 		ev->ev_next->ev_prev = ev->ev_prev;  in env_discard()
210 	if (environ == ev)  in env_discard()
211 		environ = ev->ev_next;  in env_discard()
212 	free(ev->ev_name);  in env_discard()
213 	if (ev->ev_value != NULL && (ev->ev_flags & EV_DYNAMIC) != 0)  in env_discard()
214 		free(ev->ev_value);  in env_discard()
215 	free(ev);  in env_discard()
219 env_noset(struct env_var *ev __unused, int flags __unused,  in env_noset()
226 env_nounset(struct env_var *ev __unused)  in env_nounset()