Delete bundled copy of NSS and replace with README.

nspr/pr/include/prenv.h

Index: nspr/pr/include/prenv.h
diff --git a/nspr/pr/include/prenv.h b/nspr/pr/include/prenv.h
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-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef prenv_h___
-#define prenv_h___
-
-#include "prtypes.h"
-
-/*******************************************************************************/
-/*******************************************************************************/
-/****************** THESE FUNCTIONS MAY NOT BE THREAD SAFE *********************/
-/*******************************************************************************/
-/*******************************************************************************/
-
-PR_BEGIN_EXTERN_C
-
-/*
-** PR_GetEnv() -- Retrieve value of environment variable
-** 
-** Description:
-** PR_GetEnv() is modeled on Unix getenv().
-** 
-** 
-** Inputs: 
-**   var -- The name of the environment variable
-** 
-** Returns:
-**   The value of the environment variable 'var' or NULL if
-** the variable is undefined.
-** 
-** Restrictions:
-**   You'd think that a POSIX getenv(), putenv() would be
-**   consistently implemented everywhere. Surprise! It is not. On
-**   some platforms, a putenv() where the argument is of
-**   the form "name"  causes the named environment variable to
-**   be un-set; that is: a subsequent getenv() returns NULL. On
-**   other platforms, the putenv() fails, on others, it is a
-**   no-op. Similarly, a putenv() where the argument is of the
-**   form "name=" causes the named environment variable to be
-**   un-set; a subsequent call to getenv() returns NULL. On
-**   other platforms, a subsequent call to getenv() returns a
-**   pointer to a null-string (a byte of zero).
-** 
-**   PR_GetEnv(), PR_SetEnv() provide a consistent behavior 
-**   across all supported platforms. There are, however, some
-**   restrictions and some practices you must use to achieve
-**   consistent results everywhere.
-** 
-**   When manipulating the environment there is no way to un-set
-**   an environment variable across all platforms. We suggest
-**   you interpret the return of a pointer to null-string to
-**   mean the same as a return of NULL from PR_GetEnv().
-** 
-**   A call to PR_SetEnv() where the parameter is of the form
-**   "name" will return PR_FAILURE; the environment remains
-**   unchanged. A call to PR_SetEnv() where the parameter is
-**   of the form "name=" may un-set the envrionment variable on
-**   some platforms; on others it may set the value of the
-**   environment variable to the null-string.
-** 
-**   For example, to test for NULL return or return of the
-**   null-string from PR_GetEnv(), use the following code
-**   fragment:
-** 
-**      char *val = PR_GetEnv("foo");
-**      if ((NULL == val) || ('\0' == *val)) { 
-**          ... interpret this as un-set ... 
-**      }
-** 
-**   The caller must ensure that the string passed
-**   to PR_SetEnv() is persistent. That is: The string should
-**   not be on the stack, where it can be overwritten
-**   on return from the function calling PR_SetEnv().
-**   Similarly, the string passed to PR_SetEnv() must not be
-**   overwritten by other actions of the process. ... Some
-**   platforms use the string by reference rather than copying
-**   it into the environment space. ... You have been warned!
-** 
-**   Use of platform-native functions that manipulate the
-**   environment (getenv(), putenv(), 
-**   SetEnvironmentVariable(), etc.) must not be used with
-**   NSPR's similar functions. The platform-native functions
-**   may not be thread safe and/or may operate on different
-**   conceptual environment space than that operated upon by
-**   NSPR's functions or other environment manipulating
-**   functions on the same platform. (!)
-** 
-*/
-NSPR_API(char*) PR_GetEnv(const char *var);
-
-/*
-** PR_GetEnvSecure() -- get a security-sensitive environment variable
-**
-** Description:
-**
-** PR_GetEnvSecure() is similar to PR_GetEnv(), but it returns NULL if
-** the program was run with elevated privilege (e.g., setuid or setgid
-** on Unix).  This can be used for cases like log file paths which
-** could otherwise be used for privilege escalation.  Note that some
-** platforms may have platform-specific privilege elevation mechanisms
-** not recognized by this function; see the implementation for details.
-*/
-NSPR_API(char*) PR_GetEnvSecure(const char *var);
-
-/*
-** PR_SetEnv() -- set, unset or change an environment variable
-** 
-** Description:
-** PR_SetEnv() is modeled on the Unix putenv() function.
-** 
-** Inputs: 
-**   string -- pointer to a caller supplied
-**   constant, persistent string of the form name=value. Where
-**   name is the name of the environment variable to be set or
-**   changed; value is the value assigned to the variable.
-**
-** Returns: 
-**   PRStatus.
-** 
-** Restrictions: 
-**   See the Restrictions documented in the description of
-**   PR_GetEnv() in this header file.
-** 
-** 
-*/
-NSPR_API(PRStatus) PR_SetEnv(const char *string);
-
-/*
-** PR_DuplicateEnvironment() -- Obtain a copy of the environment.
-**
-** Description:
-** PR_DuplicateEnvironment() copies the environment so that it can be
-** modified without changing the current process's environment, and
-** then passed to interfaces such as POSIX execve().  In particular,
-** this avoids needing to allocate memory or take locks in the child
-** after a fork(); neither of these is allowed by POSIX after a
-** multithreaded process calls fork(), and PR_SetEnv does both.
-**
-** Inputs:
-**   none
-**
-** Returns:
-**   A pointer to a null-terminated array of null-terminated strings,
-**   like the traditional global variable "environ".  The array and
-**   the strings are allocated with PR_Malloc(), and it is the
-**   caller's responsibility to free them.
-**
-**   In case of memory allocation failure, or if the operating system
-**   doesn't support reading the entire environment through the global
-**   variable "environ" or similar, returns NULL instead.
-**
-** Restrictions:
-**   Similarly to PR_GetEnv(), this function may not interoperate as
-**   expected with the operating system's native environment accessors.
-*/
-NSPR_API(char **) PR_DuplicateEnvironment(void);
-
-PR_END_EXTERN_C
-
-#endif /* prenv_h___ */