_getenv_r patch

[Howland Craig D (Craig)]

Here's a patch for _getenv_r() so that it properly fails to make a match
if the given name contains an '='.  (Otherwise it can erroneously
match an entry which has an = in the value.)  The patch file contains
the
ChangeLog entry, too.
 
Craig Howland
 
The following program fragment demonstrates the problem being solved.

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
...

int  ow=1;
const char  *id, *val;

/* Tricky case */
id = "Craig";
val = "two=one";
ow = 1;
printf("setenv('%s','%s', %d) = %d\n", id, val, ow, setenv(id, val,
ow));
/* env now contains "Craig=two=one" */
printf("getenv('%s') = %s\n", id, getenv(id));	// Good match
id = "Craig=two";
printf("getenv('%s') = %s\n", id, getenv(id));	// Potential false match
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