/*
 * This file is part of the UCB release of Plan 9. It is subject to the license
 * terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
 * part of the UCB release of Plan 9, including this file, may be copied,
 * modified, propagated, or distributed except according to the terms contained
 * in the LICENSE file.
 */

#include <u.h>
#include <libc.h>

char*
getenv(const char *name)
{
	int r, f;
	int32_t s;
	char *ans;
	char *p, *ep, ename[100];

	if(strchr(name, '/') != nil)
		return nil;
	snprint(ename, sizeof ename, "/env/%s", name);
	if(strcmp(ename+5, name) != 0)
		return nil;
	f = open(ename, OREAD);
	if(f < 0)
		return 0;
	s = seek(f, 0, 2);
	ans = malloc(s+1);
	if(ans) {
		setmalloctag(ans, getcallerpc());
		seek(f, 0, 0);
		r = read(f, ans, s);
		if(r >= 0) {
			ep = ans + s - 1;
			for(p = ans; p < ep; p++)
				if(*p == '\0')
					*p = ' ';
			ans[s] = '\0';
		}
	}
	close(f);
	return ans;
}