stdlib/FreeBSD/putenv.c

   1 /*-
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)putenv.c    8.2 (Berkeley) 3/27/94";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/stdlib/putenv.c,v 1.6 2007/05/01 16:02:41 ache Exp $");
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <sys/types.h>
  39 #include <db.h>
  40 #include <crt_externs.h>
  41 #include <errno.h>
  42
  43 extern struct owned_ptr *__env_owned;
  44
  45 #ifdef LEGACY_CRT1_ENVIRON
  46 extern char **_saved_environ;
  47 #endif /* LEGACY_CRT1_ENVIRON */
  48
  49 __private_extern__ int __init__env_owned_locked(int);
  50 __private_extern__ int __setenv_locked(const char *, const char *, int, int, char ***, struct owned_ptr *);
  51 __private_extern__ void __environ_lock(void);
  52 __private_extern__ void __environ_unlock(void);
  53
  54 #ifndef BUILDING_VARIANT
  55 /*
  56  * _putenvp -- SPI using an arbitrary pointer to string array (the array must
  57  * have been created with malloc) and an env state, created by _allocenvstate().
  58  *      Returns ptr to value associated with name, if any, else NULL.
  59  */
  60 int
  61 _putenvp(char *str, char ***envp, void *state)
  62 {
  63         __environ_lock();
  64         if (__init__env_owned_locked(1)) {
  65                 __environ_unlock();
  66                 return (-1);
  67         }
  68         int ret = __setenv_locked(str, NULL, 1, 0, envp,
  69                         (state ? (struct owned_ptr *)state : __env_owned));
  70         __environ_unlock();
  71         return ret;
  72 }
  73 #endif /* BUILDING_VARIANT */
  74
  75 int
  76 putenv(str)
  77         char *str;
  78 {
  79         int ret;
  80         int copy;
  81
  82 #if __DARWIN_UNIX03
  83         if (str == NULL || *str == 0 || index(str, '=') == NULL) {
  84                 errno = EINVAL;
  85                 return (-1);
  86         }
  87 #else /* !__DARWIN_UNIX03 */
  88         if (index(str, '=') == NULL)
  89                 return (-1);
  90 #endif /* __DARWIN_UNIX03 */
  91
  92 #if __DARWIN_UNIX03
  93         copy = 0;
  94 #else /* !__DARWIN_UNIX03 */
  95         copy = -1;
  96 #endif /* __DARWIN_UNIX03 */
  97
  98         __environ_lock();
  99         if (__init__env_owned_locked(1)) {
 100                 __environ_unlock();
 101                 return (-1);
 102         }
 103         ret = __setenv_locked(str, NULL, 1, copy, _NSGetEnviron(), __env_owned);
 104 #ifdef LEGACY_CRT1_ENVIRON
 105         _saved_environ = *_NSGetEnviron();
 106 #endif /* LEGACY_CRT1_ENVIRON */
 107         __environ_unlock();
 108         return ret;
 109 }