getenv() function for getting the environment variable

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HI ALL,

Now i am using the getenv() function for getting the environment variable.You can see the example below and find when fun() execute first time str have initialized that value but when we call fun() in second time then str have not initialize full path.. I need ur help, how i get the full path when we call fun() in second time.

C++

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <string.h>
void fun();
int main ()
{
 fun();
 fun(); 
 return 0;
}
void fun()
{
  char * pch,*val,*str,*str1;
  
  val = "TEMP";
  str = getenv(val);
  str1=str;
  pch = strtok (str1,"\\");
  while (pch != NULL)
  {
    pch = strtok (NULL,"\\");
  }
}

Regards
saurabh agrawal

Posted 17-Oct-12 2:05am

saurbh ag

Updated 17-Oct-12 2:12am

Jochen Arndt

v2

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Jochen Arndt · Answer 1 · 2012-10-17T02:21:00

Solution 1

getenv() returns a pointer to an internal environment table. By using strtok(), you are modifying the string in the internal table. To avoid this, you must create a copy of the returned string and use this copy for parsing with strtok(). You may use something like this:

C++

// Allocate memory and copy string
str1 = strdup(str);
// do something with str1 here

// release memory
free(str1);

Posted 17-Oct-12 2:21am

Jochen Arndt

Comments

Legor 17-Oct-12 8:23am

Exactly!

Jochen Arndt 17-Oct-12 8:37am

Thank you.

CPallini 17-Oct-12 8:29am

5.

Jochen Arndt 17-Oct-12 8:37am

Thank you too.