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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 * CDECL MSVCRT_getenv(const char *name)
  33 {
  34     char **environ;
  35     unsigned int length=strlen(name);
  36
  37     for (environ = MSVCRT__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 * CDECL _wgetenv(const MSVCRT_wchar_t *name)
  54 {
  55     MSVCRT_wchar_t **environ;
  56     unsigned int length=strlenW(name);
  57
  58     /* Initialize the _wenviron array if it's not already created. */
  59     if (!MSVCRT__wenviron)
  60         MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(NULL);
  61
  62     for (environ = MSVCRT__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 CDECL _putenv(const char *str)
  79 {
  80  char *name, *value;
  81  char *dst;
  82  int ret;
  83
  84  TRACE("%s\n", debugstr_a(str));
  85
  86  if (!str)
  87    return -1;
  88
  89  name = HeapAlloc(GetProcessHeap(), 0, strlen(str) + 1);
  90  if (!name)
  91    return -1;
  92  dst = name;
  93  while (*str && *str != '=')
  94   *dst++ = *str++;
  95  if (!*str++)
  96  {
  97    ret = -1;
  98    goto finish;
  99  }
 100  *dst++ = '\0';
 101  value = dst;
 102  while (*str)
 103   *dst++ = *str++;
 104  *dst = '\0';
 105
 106  ret = SetEnvironmentVariableA(name, value[0] ? value : NULL) ? 0 : -1;
 107
 108  /* _putenv returns success on deletion of nonexistent variable, unlike [Rtl]SetEnvironmentVariable */
 109  if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 110
 111  MSVCRT__environ = msvcrt_SnapshotOfEnvironmentA(MSVCRT__environ);
 112  /* Update the __p__wenviron array only when already initialized */
 113  if (MSVCRT__wenviron)
 114    MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(MSVCRT__wenviron);
 115
 116 finish:
 117  HeapFree(GetProcessHeap(), 0, name);
 118  return ret;
 119 }
 120
 121 /*********************************************************************
 122  *              _wputenv (MSVCRT.@)
 123  */
 124 int CDECL _wputenv(const MSVCRT_wchar_t *str)
 125 {
 126  MSVCRT_wchar_t *name, *value;
 127  MSVCRT_wchar_t *dst;
 128  int ret;
 129
 130  TRACE("%s\n", debugstr_w(str));
 131
 132  if (!str)
 133    return -1;
 134  name = HeapAlloc(GetProcessHeap(), 0, (strlenW(str) + 1) * sizeof(MSVCRT_wchar_t));
 135  if (!name)
 136    return -1;
 137  dst = name;
 138  while (*str && *str != '=')
 139   *dst++ = *str++;
 140  if (!*str++)
 141  {
 142    ret = -1;
 143    goto finish;
 144  }
 145  *dst++ = 0;
 146  value = dst;
 147  while (*str)
 148   *dst++ = *str++;
 149  *dst = 0;
 150
 151  ret = SetEnvironmentVariableW(name, value[0] ? value : NULL) ? 0 : -1;
 152
 153  /* _putenv returns success on deletion of nonexistent variable, unlike [Rtl]SetEnvironmentVariable */
 154  if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 155
 156  MSVCRT__environ = msvcrt_SnapshotOfEnvironmentA(MSVCRT__environ);
 157  MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(MSVCRT__wenviron);
 158
 159 finish:
 160  HeapFree(GetProcessHeap(), 0, name);
 161  return ret;
 162 }
 163
 164 /*********************************************************************
 165  *              _putenv_s (MSVCRT.@)
 166  */
 167 int CDECL _putenv_s(const char *name, const char *value)
 168 {
 169     int ret;
 170
 171     TRACE("%s %s\n", debugstr_a(name), debugstr_a(value));
 172
 173     if (!MSVCRT_CHECK_PMT(name != NULL) || !MSVCRT_CHECK_PMT(value != NULL))
 174     {
 175         *MSVCRT__errno() = MSVCRT_EINVAL;
 176         return -1;
 177     }
 178
 179     ret = SetEnvironmentVariableA(name, value[0] ? value : NULL) ? 0 : -1;
 180
 181     /* _putenv returns success on deletion of nonexistent variable, unlike [Rtl]SetEnvironmentVariable */
 182     if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 183
 184     MSVCRT__environ = msvcrt_SnapshotOfEnvironmentA(MSVCRT__environ);
 185     MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(MSVCRT__wenviron);
 186
 187     return ret;
 188 }
 189
 190 /*********************************************************************
 191  *              _wputenv_s (MSVCRT.@)
 192  */
 193 int CDECL _wputenv_s(const MSVCRT_wchar_t *name, const MSVCRT_wchar_t *value)
 194 {
 195     int ret;
 196
 197     TRACE("%s %s\n", debugstr_w(name), debugstr_w(value));
 198
 199     if (!MSVCRT_CHECK_PMT(name != NULL) || !MSVCRT_CHECK_PMT(value != NULL))
 200     {
 201         *MSVCRT__errno() = MSVCRT_EINVAL;
 202         return -1;
 203     }
 204
 205     ret = SetEnvironmentVariableW(name, value[0] ? value : NULL) ? 0 : -1;
 206
 207     /* _putenv returns success on deletion of nonexistent variable, unlike [Rtl]SetEnvironmentVariable */
 208     if ((ret == -1) && (GetLastError() == ERROR_ENVVAR_NOT_FOUND)) ret = 0;
 209
 210     MSVCRT__environ = msvcrt_SnapshotOfEnvironmentA(MSVCRT__environ);
 211     MSVCRT__wenviron = msvcrt_SnapshotOfEnvironmentW(MSVCRT__wenviron);
 212
 213     return ret;
 214 }
 215
 216 /******************************************************************
 217  *              _dupenv_s (MSVCRT.@)
 218  */
 219 int CDECL _dupenv_s(char **buffer, MSVCRT_size_t *numberOfElements, const char *varname)
 220 {
 221     char*               e;
 222     MSVCRT_size_t       sz;
 223
 224     if (!MSVCRT_CHECK_PMT(buffer != NULL) || !MSVCRT_CHECK_PMT(varname) ||
 225         !(e = MSVCRT_getenv(varname)))
 226     {
 227         return *MSVCRT__errno() = MSVCRT_EINVAL;
 228     }
 229     sz = strlen(e) + 1;
 230     if (!(*buffer = MSVCRT_malloc(sz)))
 231     {
 232         if (numberOfElements) *numberOfElements = 0;
 233         return *MSVCRT__errno() = MSVCRT_ENOMEM;
 234     }
 235     strcpy(*buffer, e);
 236     if (numberOfElements) *numberOfElements = sz;
 237     return 0;
 238 }
 239
 240 /******************************************************************
 241  *              _wdupenv_s (MSVCRT.@)
 242  */
 243 int CDECL _wdupenv_s(MSVCRT_wchar_t **buffer, MSVCRT_size_t *numberOfElements,
 244                      const MSVCRT_wchar_t *varname)
 245 {
 246     MSVCRT_wchar_t*     e;
 247     MSVCRT_size_t       sz;
 248
 249     if (!MSVCRT_CHECK_PMT(buffer != NULL) || !MSVCRT_CHECK_PMT(varname) ||
 250         !(e = _wgetenv(varname)))
 251     {
 252         return *MSVCRT__errno() = MSVCRT_EINVAL;
 253     }
 254     sz = strlenW(e) + 1;
 255     if (!(*buffer = MSVCRT_malloc(sz * sizeof(MSVCRT_wchar_t))))
 256     {
 257         if (numberOfElements) *numberOfElements = 0;
 258         return *MSVCRT__errno() = MSVCRT_ENOMEM;
 259     }
 260     strcpyW(*buffer, e);
 261     if (numberOfElements) *numberOfElements = sz;
 262     return 0;
 263 }
 264
 265 /******************************************************************
 266  *              getenv_s (MSVCRT.@)
 267  */
 268 int CDECL getenv_s(MSVCRT_size_t *pReturnValue, char* buffer, MSVCRT_size_t numberOfElements, const char *varname)
 269 {
 270     char*       e;
 271
 272     if (!MSVCRT_CHECK_PMT(pReturnValue != NULL) ||
 273         !MSVCRT_CHECK_PMT(!(buffer == NULL && numberOfElements > 0)) ||
 274         !MSVCRT_CHECK_PMT(varname != NULL))
 275     {
 276         return *MSVCRT__errno() = MSVCRT_EINVAL;
 277     }
 278     if (!(e = MSVCRT_getenv(varname)))
 279     {
 280         *pReturnValue = 0;
 281         return *MSVCRT__errno() = MSVCRT_EINVAL;
 282     }
 283     *pReturnValue = strlen(e) + 1;
 284     if (numberOfElements < *pReturnValue)
 285     {
 286         return *MSVCRT__errno() = MSVCRT_ERANGE;
 287     }
 288     strcpy(buffer, e);
 289     return 0;
 290 }
 291
 292 /******************************************************************
 293  *              _wgetenv_s (MSVCRT.@)
 294  */
 295 int CDECL _wgetenv_s(MSVCRT_size_t *pReturnValue, MSVCRT_wchar_t *buffer, MSVCRT_size_t numberOfElements,
 296                      const MSVCRT_wchar_t *varname)
 297 {
 298     MSVCRT_wchar_t*     e;
 299
 300     if (!MSVCRT_CHECK_PMT(pReturnValue != NULL) ||
 301         !MSVCRT_CHECK_PMT(!(buffer == NULL && numberOfElements > 0)) ||
 302         !MSVCRT_CHECK_PMT(varname != NULL))
 303     {
 304         return *MSVCRT__errno() = MSVCRT_EINVAL;
 305     }
 306     if (!(e = _wgetenv(varname)))
 307     {
 308         *pReturnValue = 0;
 309         return *MSVCRT__errno() = MSVCRT_EINVAL;
 310     }
 311     *pReturnValue = strlenW(e) + 1;
 312     if (numberOfElements < *pReturnValue)
 313     {
 314         return *MSVCRT__errno() = MSVCRT_ERANGE;
 315     }
 316     strcpyW(buffer, e);
 317     return 0;
 318 }