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 #include "wine/debug.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  28
  29 /*********************************************************************
  30  *              getenv (MSVCRT.@)
  31  */
  32 char *MSVCRT_getenv(const char *name)
  33 {
  34     char **environ;
  35     unsigned int length=strlen(name);
  36
  37     for (environ = *__p__environ(); *environ; environ++)
  38     {
  39         char *str = *environ;
  40         char *pos = strchr(str,'=');
  41         if (pos && ((pos - str) == length) && !strncasecmp(str,name,length))
  42         {
  43             TRACE("(%s): got %s\n", debugstr_a(name), debugstr_a(pos + 1));
  44             return pos + 1;
  45         }
  46     }
  47     return NULL;
  48 }
  49
  50 /*********************************************************************
  51  *              _wgetenv (MSVCRT.@)
  52  */
  53 MSVCRT_wchar_t *_wgetenv(const MSVCRT_wchar_t *name)
  54 {
  55     MSVCRT_wchar_t **environ;
  56     unsigned int length=strlenW(name);
  57
  58     for (environ = *__p__wenviron(); *environ; environ++)
  59     {
  60         MSVCRT_wchar_t *str = *environ;
  61         MSVCRT_wchar_t *pos = strchrW(str,'=');
  62         if (pos && ((pos - str) == length) && !strncmpiW(str,name,length))
  63         {
  64             TRACE("(%s): got %s\n", debugstr_w(name), debugstr_w(pos + 1));
  65             return pos + 1;
  66         }
  67     }
  68     return NULL;
  69 }
  70
  71 /*********************************************************************
  72  *              _putenv (MSVCRT.@)
  73  */
  74 int _putenv(const char *str)
  75 {
  76  char name[256], value[512];
  77  char *dst = name;
  78  int ret;
  79
  80  TRACE("%s\n", str);
  81
  82  if (!str)
  83    return -1;
  84  while (*str && *str != '=')
  85   *dst++ = *str++;
  86  if (!*str++)
  87    return -1;
  88  *dst = '\0';
  89  dst = value;
  90  while (*str)
  91   *dst++ = *str++;
  92  *dst = '\0';
  93
  94  ret = SetEnvironmentVariableA(name, value[0] ? value : NULL) ? 0 : -1;
  95
  96  /* _putenv returns success on deletion of non-existent variable, unlike [Rtl]SetEnvironmentVariable */
  97  if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
  98
  99  /* Update the __p__environ array only when already initialized */
 100  if (_environ)
 101    _environ = msvcrt_SnapshotOfEnvironmentA(_environ);
 102  if (_wenviron)
 103    _wenviron = msvcrt_SnapshotOfEnvironmentW(_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) ? 0 : -1;
 131
 132  /* _putenv returns success on deletion of non-existent variable, unlike [Rtl]SetEnvironmentVariable */
 133  if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 134
 135  /* Update the __p__environ array only when already initialized */
 136  if (_environ)
 137    _environ = msvcrt_SnapshotOfEnvironmentA(_environ);
 138  if (_wenviron)
 139    _wenviron = msvcrt_SnapshotOfEnvironmentW(_wenviron);
 140  return ret;
 141 }