On Sun, 06 Apr 2008 14:37:06 PDT Doug Hardie <[EMAIL PROTECTED]> wrote:
> Somewhere between FreeBSD 6.2 and 7.0 getenv has been changed to
> return a null if an environment variable is set but has no value. I
> don't find anything anywhere in the documentation/man pages on this.
> As a result, you cannot distinguish between a variable that is not set
> and one that is set to a value of "". Is this a bug or a feature
> change?
This is not what I see on 7.0 or -current (and it would not
be standard compliant). Try this under /bin/sh:
cat >x.c<<EOF
#include <stdlib.h>
#include <stdio.h>
int main(int c, char**v) {
char* a = getenv(v[1]);
printf("%s\n", a? a : "--null--");
return 0;
}
EOF
cc x.c
foo="" ./a.out foo # this should return a blank line
./a.out foo # this should return a line with --null--
If your system behaves differently may be you can attach a
simple test that shows the bug?
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