dlls/msvcrt/environ.c

   1 /*
   2  * msvcrt.dll environment functions
   3  *
   4  * Copyright 1996,1998 Marcus Meissner
   5  * Copyright 1996 Jukka Iivonen
   6  * Copyright 1997,2000 Uwe Bonnes
   7  * Copyright 2000 Jon Griffiths
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23 #include "wine/unicode.h"
  24 #include "msvcrt.h"
  25
  26 #include "msvcrt/stdlib.h"
  27
  28
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  32
  33 /*********************************************************************
  34  *              getenv (MSVCRT.@)
  35  */
  36 char *MSVCRT_getenv(const char *name)
  37 {
  38     char **environ;
  39     unsigned int length=strlen(name);
  40
  41     for (environ = *__p__environ(); *environ; environ++)
  42     {
  43         char *str = *environ;
  44         char *pos = strchr(str,'=');
  45         if (pos && ((pos - str) == length) && !strncasecmp(str,name,length))
  46         {
  47             TRACE("(%s): got %s\n", debugstr_a(name), debugstr_a(pos + 1));
  48             return pos + 1;
  49         }
  50     }
  51     return NULL;
  52 }
  53
  54 /*********************************************************************
  55  *              _wgetenv (MSVCRT.@)
  56  */
  57 MSVCRT_wchar_t *_wgetenv(const MSVCRT_wchar_t *name)
  58 {
  59     MSVCRT_wchar_t **environ;
  60     unsigned int length=strlenW(name);
  61
  62     for (environ = *__p__wenviron(); *environ; environ++)
  63     {
  64         MSVCRT_wchar_t *str = *environ;
  65         MSVCRT_wchar_t *pos = strchrW(str,'=');
  66         if (pos && ((pos - str) == length) && !strncmpiW(str,name,length))
  67         {
  68             TRACE("(%s): got %s\n", debugstr_w(name), debugstr_w(pos + 1));
  69             return pos + 1;
  70         }
  71     }
  72     return NULL;
  73 }
  74
  75 /*********************************************************************
  76  *              _putenv (MSVCRT.@)
  77  */
  78 int _putenv(const char *str)
  79 {
  80  char name[256], value[512];
  81  char *dst = name;
  82  int ret;
  83
  84  TRACE("%s\n", str);
  85
  86  if (!str)
  87    return -1;
  88  while (*str && *str != '=')
  89   *dst++ = *str++;
  90  if (!*str++)
  91    return -1;
  92  *dst = '\0';
  93  dst = value;
  94  while (*str)
  95   *dst++ = *str++;
  96  *dst = '\0';
  97
  98  ret = !SetEnvironmentVariableA(name, value[0] ? value : NULL);
  99  /* Update the __p__environ array only when already initialized */
 100  if (MSVCRT__environ)
 101    MSVCRT__environ = msvcrt_SnapshotOfEnvironmentA(MSVCRT__environ);
 102  if (MSVCRT__wenviron)
 103    MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(MSVCRT__wenviron);
 104  return ret;
 105 }
 106
 107 /*********************************************************************
 108  *              _wputenv (MSVCRT.@)
 109  */
 110 int _wputenv(const MSVCRT_wchar_t *str)
 111 {
 112  MSVCRT_wchar_t name[256], value[512];
 113  MSVCRT_wchar_t *dst = name;
 114  int ret;
 115
 116  TRACE("%s\n", debugstr_w(str));
 117
 118  if (!str)
 119    return -1;
 120  while (*str && *str != '=')
 121   *dst++ = *str++;
 122  if (!*str++)
 123    return -1;
 124  *dst = 0;
 125  dst = value;
 126  while (*str)
 127   *dst++ = *str++;
 128  *dst = 0;
 129
 130  ret = !SetEnvironmentVariableW(name, value[0] ? value : NULL);
 131  /* Update the __p__environ array only when already initialized */
 132  if (MSVCRT__environ)
 133    MSVCRT__environ = msvcrt_SnapshotOfEnvironmentA(MSVCRT__environ);
 134  if (MSVCRT__wenviron)
 135    MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(MSVCRT__wenviron);
 136  return ret;
 137 }