/*
 *  SQLGetProfileString.c
 *
 *  $Id$
 *
 *  The iODBC driver manager.
 *
 *  Copyright (C) 1996-2021 OpenLink Software <iodbc@openlinksw.com>
 *  All Rights Reserved.
 *
 *  This software is released under the terms of either of the following
 *  licenses:
 *
 *      - GNU Library General Public License (see LICENSE.LGPL)
 *      - The BSD License (see LICENSE.BSD).
 *
 *  Note that the only valid version of the LGPL license as far as this
 *  project is concerned is the original GNU Library General Public License
 *  Version 2, dated June 1991.
 *
 *  While not mandated by the BSD license, any patches you make to the
 *  iODBC source code may be contributed back into the iODBC project
 *  at your discretion. Contributions will benefit the Open Source and
 *  Data Access community as a whole. Submissions may be made at:
 *
 *      http://www.iodbc.org
 *
 *
 *  GNU Library Generic Public License Version 2
 *  ============================================
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; only
 *  Version 2 of the License dated June 1991.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 *  The BSD License
 *  ===============
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *  3. Neither the name of OpenLink Software Inc. nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OPENLINK OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include <iodbc.h>
#include <odbcinst.h>
#include "unicode.h"

#include "inifile.h"
#include "iodbc_error.h"
#include "misc.h"

#ifndef WIN32

int
GetPrivateProfileString (LPCSTR lpszSection, LPCSTR lpszEntry,
    LPCSTR lpszDefault, LPSTR lpszRetBuffer, int cbRetBuffer,
    LPCSTR lpszFilename)
{
  char *defval = (char *) lpszDefault, *value = NULL;
  int len = 0;
  PCONFIG pCfg;

  lpszRetBuffer[0] = 0;

  /* If error during reading the file */
  if (_iodbcdm_cfg_search_init (&pCfg, lpszFilename, FALSE))
    {
      if (lpszDefault)
	STRNCPY (lpszRetBuffer, lpszDefault, cbRetBuffer - 1);
      PUSH_ERROR (ODBC_ERROR_INVALID_PATH);
      goto fail;
    }

  /* List all sections from the ini file */
  if (lpszSection == NULL || *lpszSection == '\0')
    {
      len = _iodbcdm_list_sections (pCfg, lpszRetBuffer, cbRetBuffer);
      goto done;
    }

  /* List all the entries of the specified section */
  if (lpszEntry == NULL || *lpszEntry == '\0')
    {
      len =
	  _iodbcdm_list_entries (pCfg, lpszSection, lpszRetBuffer,
	  cbRetBuffer);
      goto done;
    }

  /*
   *  Sorry for this one -- Windows cannot handle a default value of
   *  "" in GetPrivateProfileString, so it is passed as " " instead.
   */
  if (defval == NULL || *defval == '\0')
    defval = " ";

  /*
   *  Check whether someone else has modified the odbc.ini file
   */
  _iodbcdm_cfg_refresh (pCfg);

  if (!_iodbcdm_cfg_find (pCfg, (LPSTR) lpszSection, (LPSTR) lpszEntry))
    value = pCfg->value;

  if (value == NULL)
    {
      value = defval;

      if (value[0] == ' ' && value[1] == '\0')
	value = "";
    }

  STRNCPY (lpszRetBuffer, value, cbRetBuffer - 1);

done:
  _iodbcdm_cfg_done (pCfg);

fail:
  if (!len)
    len = STRLEN (lpszRetBuffer);

  if (len == cbRetBuffer - 1)
    PUSH_ERROR (ODBC_ERROR_INVALID_BUFF_LEN);

  return len;
}
#endif


int INSTAPI
SQLGetPrivateProfileString (LPCSTR lpszSection, LPCSTR lpszEntry,
    LPCSTR lpszDefault, LPSTR lpszRetBuffer, int cbRetBuffer,
    LPCSTR lpszFilename)
{
  char pathbuf[1024];
  int len = 0;

  /* Check input parameters */
  CLEAR_ERROR ();

  if (!lpszRetBuffer || !cbRetBuffer)
    {
      PUSH_ERROR (ODBC_ERROR_INVALID_BUFF_LEN);
      goto quit;
    }

  if (!lpszDefault)
    {
      PUSH_ERROR (ODBC_ERROR_GENERAL_ERR);
      goto quit;
    }

  /* Else go through user/system odbc.ini */
  switch (configMode)
    {
    case ODBC_USER_DSN:
      wSystemDSN = USERDSN_ONLY;
      if (lpszFilename)
	{
	  len =
	      GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
	      lpszRetBuffer, cbRetBuffer, lpszFilename);
	  goto quit;
	}
      if (_iodbcadm_getinifile (pathbuf, sizeof (pathbuf), FALSE, FALSE))
	len =
	    GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
	    lpszRetBuffer, cbRetBuffer, pathbuf);
      goto quit;

    case ODBC_SYSTEM_DSN:
      wSystemDSN = SYSTEMDSN_ONLY;
      if (lpszFilename)
	{
	  len =
	      GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
	      lpszRetBuffer, cbRetBuffer, lpszFilename);
	  goto quit;
	}
      if (_iodbcadm_getinifile (pathbuf, sizeof (pathbuf), FALSE, FALSE))
	len =
	    GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
	    lpszRetBuffer, cbRetBuffer, pathbuf);
      goto quit;

    case ODBC_BOTH_DSN:
      wSystemDSN = USERDSN_ONLY;
      if (lpszFilename)
	{
	  len =
	      GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
	      lpszRetBuffer, cbRetBuffer, lpszFilename);
	  if (!len)
	    {
	      CLEAR_ERROR ();
	      wSystemDSN = SYSTEMDSN_ONLY;
	      len =
		  GetPrivateProfileString (lpszSection, lpszEntry,
		  lpszDefault, lpszRetBuffer, cbRetBuffer, lpszFilename);
	    }
	  goto quit;
	}
      if (_iodbcadm_getinifile (pathbuf, sizeof (pathbuf), FALSE, FALSE))
        {
	  len =
	    GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
	    lpszRetBuffer, cbRetBuffer, pathbuf);
          if (len)
            goto quit;
        }
      CLEAR_ERROR ();
      wSystemDSN = SYSTEMDSN_ONLY;
      if (_iodbcadm_getinifile (pathbuf, sizeof (pathbuf), FALSE, FALSE))
        {
          len =
  	    GetPrivateProfileString (lpszSection, lpszEntry, lpszDefault,
		lpszRetBuffer, cbRetBuffer, pathbuf);
	}
      goto quit;
    }

  PUSH_ERROR (ODBC_ERROR_GENERAL_ERR);
  goto quit;

quit:
  wSystemDSN = USERDSN_ONLY;
  configMode = ODBC_BOTH_DSN;
  return len;
}


static IODBC_CHARSET
detectCharset(void *str)
{
  char *ch = (char *) str;
  IODBC_CHARSET cp = CP_UCS4;

#ifdef WORDS_BIGENDIAN
  if (ch[0]==0 && ch[1]!=0 && ch[2]==0)
    cp = CP_UTF16;
  else if (ch[0]==0 && ch[1]==0 && ch[2]==0 && ch[3]!=0)
    cp = CP_UCS4;
  else
    cp = CP_UTF8;
#else
  if (ch[0]!=0 && ch[1]==0 && ch[2]!=0)
    cp = CP_UTF16;
  else if (ch[0]!=0 && ch[1]==0 && ch[2]==0 && ch[3]==0)
    cp = CP_UCS4;
  else
    cp = CP_UTF8;
#endif
  return cp;
}


int INSTAPI
SQLGetPrivateProfileStringW (LPCWSTR lpszSection, LPCWSTR lpszEntry,
    LPCWSTR lpszDefault, LPWSTR lpszRetBuffer, int cbRetBuffer,
    LPCWSTR lpszFilename)
{
  char *_section_u8 = NULL;
  char *_entry_u8 = NULL;
  char *_default_u8 = NULL;
  char *_buffer_u8 = NULL;
  char *_filename_u8 = NULL;
  WORD length, len;
  DM_CONV conv;

  conv.drv_cp = conv.dm_cp = CP_UCS4;

  if (lpszFilename)
    conv.dm_cp = detectCharset((void *)lpszFilename);
  else if (lpszEntry)
    conv.dm_cp = detectCharset((void *)lpszEntry);

  length = 0;
  _section_u8 = (char *) DM_WtoU8(&conv, (void *)lpszSection, SQL_NTS);
  if (_section_u8 == NULL && lpszSection)
    {
      PUSH_ERROR (ODBC_ERROR_OUT_OF_MEM);
      goto done;
    }

  _entry_u8 = (char *) DM_WtoU8(&conv, (void *)lpszEntry, SQL_NTS);
  if (_entry_u8 == NULL && lpszEntry)
    {
      PUSH_ERROR (ODBC_ERROR_OUT_OF_MEM);
      goto done;
    }

  _default_u8 = (char *) DM_WtoU8(&conv, (void *)lpszDefault, SQL_NTS);
  if (_default_u8 == NULL && lpszDefault)
    {
      PUSH_ERROR (ODBC_ERROR_OUT_OF_MEM);
      goto done;
    }

  _filename_u8 = (char *) DM_WtoU8(&conv, (void *)lpszFilename, SQL_NTS);
  if (_filename_u8 == NULL && lpszFilename)
    {
      PUSH_ERROR (ODBC_ERROR_OUT_OF_MEM);
      goto done;
    }

  if (cbRetBuffer > 0)
    {
      if ((_buffer_u8 = malloc (cbRetBuffer * UTF8_MAX_CHAR_LEN + 1)) == NULL)
	{
	  PUSH_ERROR (ODBC_ERROR_OUT_OF_MEM);
	  goto done;
	}
    }

  length = SQLGetPrivateProfileString (_section_u8, _entry_u8, _default_u8,
      _buffer_u8, cbRetBuffer * UTF8_MAX_CHAR_LEN, _filename_u8);

  if (length > 0)
    {
      if (lpszSection == NULL || lpszEntry == NULL ||
	  lpszSection[0] == '\0' || lpszEntry[0] == '\0')
	{
          SQLCHAR *ptr;
          void *ptrW;
	  length = 0;

	  for (ptr = (SQLCHAR *)_buffer_u8, ptrW = lpszRetBuffer; *ptr; )
	    {
              dm_StrCopyOut2_U8toW_d2m (&conv, ptr, ptrW, 
                  (cbRetBuffer - length - 1) * DM_WCHARSIZE(&conv),
                  &len, NULL);

	      length += len;

	      ptr += STRLEN (ptr) + 1;
	      ptrW += (DM_WCSLEN (&conv, ptrW) + 1) * DM_WCHARSIZE(&conv);
	    }
          if (conv.dm_cp == CP_UCS4)
	    *(ucs4_t *) ptrW = 0;
	  else if (conv.dm_cp == CP_UTF16)
	    *(ucs2_t *) ptrW = 0;
	  else
	    *(SQLCHAR *) ptrW = 0;

	  length++;
	}
      else
	{
          dm_StrCopyOut2_U8toW_d2m (&conv, (SQLCHAR *)_buffer_u8, lpszRetBuffer,
              cbRetBuffer*DM_WCHARSIZE(&conv), &length, NULL);
	}
    }
  else
    {
      dm_StrCopyOut2_U8toW_d2m (&conv, (SQLCHAR *)_buffer_u8, lpszRetBuffer,
          cbRetBuffer*DM_WCHARSIZE(&conv), &length, NULL);
    }

done:
  MEM_FREE (_section_u8);
  MEM_FREE (_entry_u8);
  MEM_FREE (_default_u8);
  MEM_FREE (_buffer_u8);
  MEM_FREE (_filename_u8);

  return length;
}

BOOL INSTAPI
SQLGetKeywordValue (LPCSTR lpszSection,
    LPCSTR lpszEntry, LPSTR lpszBuffer, int cbBuffer, int *pcbBufOut)
{
  int ret =
      SQLGetPrivateProfileString (lpszSection, lpszEntry, "", lpszBuffer,
      cbBuffer, "odbc.ini");

  if (pcbBufOut)
    *pcbBufOut = ret;

  return (ret != 0);
}

BOOL INSTAPI
SQLGetKeywordValueW (LPCWSTR lpszSection,
    LPCWSTR lpszEntry, LPWSTR lpszBuffer, int cbBuffer, int *pcbBufOut)
{
  int ret =
      SQLGetPrivateProfileStringW (lpszSection, lpszEntry, L"", lpszBuffer,
      cbBuffer, L"odbc.ini");

  if (pcbBufOut)
    *pcbBufOut = ret;

  return (ret != 0);
}
