Make putenv() fully conforms to Open Group specs Issue 6

(also IEEE Std 1003.1-2001)

The specs explicitly says that altering passed string
should change the environment, i.e. putenv() directly puts its arg
into environment (unlike setenv() which just copies it there).
It means that putenv() can't be implemented via setenv()
(like we have before) at all. Putenv() value lives (allows modifying)
up to the next putenv() or setenv() call.

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/libc/stdlib/getenv.c b/lib/libc/stdlib/getenv.c
index 73ac407..9ff18d8 100644
--- a/lib/libc/stdlib/getenv.c
+++ b/lib/libc/stdlib/getenv.c
@@ -43,7 +43,8 @@ inline char *__findenv(const char *, int *);
  * __findenv --
  *	Returns pointer to value associated with name, if any, else NULL.
  *	Sets offset to be the offset of the name/value combination in the
- *	environmental array, for use by setenv(3) and unsetenv(3).
+ *      environmental array, for use by putenv(3), setenv(3) and unsetenv(3).
+ *	Explicitly removes '=' in argument name.
  *
  *	This routine *should* be a static; don't use it.
  */
@@ -59,7 +60,9 @@ __findenv(name, offset)
 
 	if (environ == NULL)
 		return (NULL);
-	len = strlen(name);
+	for (np = name; *np && *np != '='; ++np)
+		continue;
+	len = np - name;
 	for (p = environ; (cp = *p) != NULL; ++p) {
 		for (np = name, i = len; i && *cp; i--)
 			if (*cp++ != *np++)