From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <5af454af871f92500ab67496a2152d52@vitanuova.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Printenv(1)
Date: Tue, 11 May 2004 19:41:57 +0100
From: rog@vitanuova.com
In-Reply-To: <ee9e417a040508081457f3fe12@mail.gmail.com>
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> For something that handles lists properly,
>
> cd /env
> whatis * | grep '='

pity about the "not found" messages, problems with variables
containing newlines and other exceptions...

for more-than-casual use, i think a C tool would probably
be better, maybe something like this:

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

void
printenv(char *name, int len)
{
	int r, f, z;
	char *ans, *t, *ep, *p;
	char *ename;

	ename = smprint("#e/%s", name);
	f = open(ename, OREAD);
	if(f < 0)
		return;

	ans = malloc(len+1);
	if(ans){
		r = read(f, ans, len);
		print("%q=", name);
		if(r >= 0){
			ep = ans + r;
			t = ans;
			z = 0;
			for(p = ans; p < ep; p++){
				if(*p == '\0'){
					print("%q ", t);
					t = p+1;
					z = 1;
				}
			}
			if(z == 0){
				*p = '\0';
				print("%q", ans);
			}
			print("\n");
		}
	}
	close(f);
	free(ans);
}

void
main(int, char **)
{
	int fd, i;
	long nd;
	Dir *buf;

	fd = open("#e", OREAD);
	nd = dirreadall(fd, &buf);
	quotefmtinstall();

	for(i = 0; i < nd; i++)
		printenv(buf[i].name, buf[i].length);
}