src/mkstemp.c

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/*
     This file is part of PlibC.
     (C) 2005 Nils Durner (and other contributing authors)

           This library is free software; you can redistribute it and/or
           modify it under the terms of the GNU Lesser General Public
           License as published by the Free Software Foundation; either
           version 2.1 of the License, or (at your option) any later version.
        
           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
           Lesser General Public License for more details.
        
           You should have received a copy of the GNU Lesser General Public
           License along with this library; if not, write to the Free Software
           Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "plibc_private.h"

int mkstemp(char *tmplate)
{
  static const char letters[]
    = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  int iLen, iRnd;
  char *pChr;

  errno = 0;

  iLen = strlen(tmplate);
  if(iLen >= 6)
  {
    pChr = tmplate + iLen - 6;
    srand((unsigned int) time(NULL));

    if(strncmp(pChr, "XXXXXX", 6) == 0)
    {
      int iChr;
      for(iChr = 0; iChr < 6; iChr++)
      {
        /* 528.5 = RAND_MAX / letters */
        iRnd = rand() / 528.5;
        *(pChr++) = letters[iRnd > 0 ? iRnd - 1 : 0];
      }
    }
    else
    {
      errno = EINVAL;
      return -1;
    }
  }
  else
  {
    errno = EINVAL;
    return -1;
  }
  
  return _win_open(tmplate, _O_CREAT | _O_EXCL | _O_RDWR, _S_IREAD | _S_IWRITE);
}

/* end of mkstemp.c */

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