reactos/ntoskrnl/rtl/strtok.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/rtl/strtok.c
   5  * PURPOSE:         Unicode and thread safe implementation of strtok
   6  * PROGRAMMER:      David Welch (welch@mcmail.com)
   7  * UPDATE HISTORY:
   8  *                  Created 22/05/98
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <internal/kernel.h>
  14 #include <internal/linkage.h>
  15 #include <ddk/ntddk.h>
  16
  17 #include <internal/debug.h>
  18
  19
  20 /* FUNCTIONS *****************************************************************/
  21
  22 PWSTR RtlStrtok(PUNICODE_STRING _string, PWSTR _sep,
  23                 PWSTR* temp)
  24 /*
  25  * FUNCTION: Splits a string into tokens
  26  * ARGUMENTS:
  27  *         string = string to operate on
  28  *                  if NULL then continue with previous string
  29  *         sep = Token deliminators
  30  *         temp = Tempory storage provided by the caller
  31  * ARGUMENTS: Returns the beginning of the next token
  32  */
  33 {
  34    PWSTR string;
  35    PWSTR sep;
  36    PWSTR start;
  37
  38    if (_string!=NULL)
  39      {
  40         string = _string->Buffer;
  41      }
  42    else
  43      {
  44         string = *temp;
  45      }
  46
  47    start = string;
  48
  49    while ((*string)!=0)
  50      {
  51         sep = _sep;
  52         while ((*sep)!=0)
  53           {
  54              if ((*string)==(*sep))
  55                {
  56                   *string=0;
  57                   *temp=string+1;
  58                   return(start);
  59                }
  60              sep++;
  61           }
  62         string++;
  63      }
  64    *temp=NULL;
  65    return(start);
  66 }