diff options
Diffstat (limited to 'lib/putenv.c')
| -rw-r--r-- | lib/putenv.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/lib/putenv.c b/lib/putenv.c deleted file mode 100644 index 9e862e63d3d..00000000000 --- a/lib/putenv.c +++ /dev/null @@ -1,194 +0,0 @@ -/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2020 Free Software - Foundation, Inc. - - NOTE: The canonical source of this file is maintained with the GNU C - Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu. - - This program is free software: you can redistribute it and/or modify it - under the terms of the GNU General Public License as published by the - Free Software Foundation; either version 3 of the License, or any - later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <https://www.gnu.org/licenses/>. */ - -#include <config.h> - -/* Specification. */ -#include <stdlib.h> - -#include <stddef.h> - -/* Include errno.h *after* sys/types.h to work around header problems - on AIX 3.2.5. */ -#include <errno.h> -#ifndef __set_errno -# define __set_errno(ev) ((errno) = (ev)) -#endif - -#include <string.h> -#include <unistd.h> - -#if defined _WIN32 && ! defined __CYGWIN__ -# define WIN32_LEAN_AND_MEAN -# include <windows.h> -#endif - -#if _LIBC -# if HAVE_GNU_LD -# define environ __environ -# else -extern char **environ; -# endif -#endif - -#if _LIBC -/* This lock protects against simultaneous modifications of 'environ'. */ -# include <bits/libc-lock.h> -__libc_lock_define_initialized (static, envlock) -# define LOCK __libc_lock_lock (envlock) -# define UNLOCK __libc_lock_unlock (envlock) -#else -# define LOCK -# define UNLOCK -#endif - -static int -_unsetenv (const char *name) -{ - size_t len; -#if !HAVE_DECL__PUTENV - char **ep; -#endif - - if (name == NULL || *name == '\0' || strchr (name, '=') != NULL) - { - __set_errno (EINVAL); - return -1; - } - - len = strlen (name); - -#if HAVE_DECL__PUTENV - { - int putenv_result, putenv_errno; - char *name_ = malloc (len + 2); - memcpy (name_, name, len); - name_[len] = '='; - name_[len + 1] = 0; - putenv_result = _putenv (name_); - putenv_errno = errno; - free (name_); - __set_errno (putenv_errno); - return putenv_result; - } -#else - - LOCK; - - ep = environ; - while (*ep != NULL) - if (!strncmp (*ep, name, len) && (*ep)[len] == '=') - { - /* Found it. Remove this pointer by moving later ones back. */ - char **dp = ep; - - do - dp[0] = dp[1]; - while (*dp++); - /* Continue the loop in case NAME appears again. */ - } - else - ++ep; - - UNLOCK; - - return 0; -#endif -} - - -/* Put STRING, which is of the form "NAME=VALUE", in the environment. - If STRING contains no '=', then remove STRING from the environment. */ -int -putenv (char *string) -{ - const char *name_end = strchr (string, '='); - char **ep; - - if (name_end == NULL) - { - /* Remove the variable from the environment. */ - return _unsetenv (string); - } - -#if HAVE_DECL__PUTENV - /* Rely on _putenv to allocate the new environment. If other - parts of the application use _putenv, the !HAVE_DECL__PUTENV code - would fight over who owns the environ vector, causing a crash. */ - if (name_end[1]) - return _putenv (string); - else - { - /* _putenv ("NAME=") unsets NAME, so invoke _putenv ("NAME= ") - to allocate the environ vector and then replace the new - entry with "NAME=". */ - int putenv_result, putenv_errno; - char *name_x = malloc (name_end - string + sizeof "= "); - if (!name_x) - return -1; - memcpy (name_x, string, name_end - string + 1); - name_x[name_end - string + 1] = ' '; - name_x[name_end - string + 2] = 0; - putenv_result = _putenv (name_x); - putenv_errno = errno; - for (ep = environ; *ep; ep++) - if (strcmp (*ep, name_x) == 0) - { - *ep = string; - break; - } -# if defined _WIN32 && ! defined __CYGWIN__ - if (putenv_result == 0) - { - /* _putenv propagated "NAME= " into the subprocess environment; - fix that by calling SetEnvironmentVariable directly. */ - name_x[name_end - string] = 0; - putenv_result = SetEnvironmentVariable (name_x, "") ? 0 : -1; - putenv_errno = ENOMEM; /* ENOMEM is the only way to fail. */ - } -# endif - free (name_x); - __set_errno (putenv_errno); - return putenv_result; - } -#else - for (ep = environ; *ep; ep++) - if (strncmp (*ep, string, name_end - string) == 0 - && (*ep)[name_end - string] == '=') - break; - - if (*ep) - *ep = string; - else - { - static char **last_environ = NULL; - size_t size = ep - environ; - char **new_environ = malloc ((size + 2) * sizeof *new_environ); - if (! new_environ) - return -1; - new_environ[0] = string; - memcpy (new_environ + 1, environ, (size + 1) * sizeof *new_environ); - free (last_environ); - last_environ = new_environ; - environ = new_environ; - } - - return 0; -#endif -} |