wgetcwd

Name

wgetcwd - gets current working directory

Library

libc.lib

Synopsis

#include <wchar.h>

wchar_t * wgetcwd (wchar_t *buf, size_t size);

Return values

Upon successful completion, a pointer to the pathname is returned. Otherwise a NULL pointer is returned and the global variable errno is set to indicate the error. In addition, wgetcwd copies the error message associated with errno into the memory referenced by buf.

Detailed description

The wgetcwd function copies the absolute pathname of the current working directory into the memory referenced by buf which is a wchar_t pointer and returns a pointer to buf. The size argument is the size, in bytes, of the array referenced by buf.

If buf is NULL, space is allocated as indicated by size to store the pathname and the current working directory is returned as long as the size bytes are sufficient to hold the working directory name. This space may later be free’d.

This routine has traditionally been used by programs to save the name of a working directory for the purpose of returning to it. A much faster and less error-prone method of accomplishing this is to open the current directory (‘.’) and use the fchdir function to return.

Examples

#include<wchar.h>
#include<stdio.h>
#include <stdlib.h>
#define BUF_SIZE 100
  
int main()
{
 int c;                 
 long size = BUF_SIZE;
 wchar_t *buf = NULL;
 wchar_t *ptr = NULL;
  
 c = wchdir("c:\\");            /* change directory to c: */
  
 buf = (wchar_t *)malloc((size_t)size);
  
 if (buf != NULL && c == 0)
        {
        ptr = wgetcwd(buf, (size_t)size);               /* call wgetcwd to fetch the current directory */
        printf("wgetcwd returned: %s\n", ptr);
        }
 free(buf);
 return 0;
}

Output

wgetcwd returned: c:\

Errors

The wgetcwd function will fail if:

[`EACCES`]
	Read or search permission was denied for a component of the pathname.
[`EINVAL`]
	The size argument is zero and buf is not a null pointer.
[`ENOENT`]
	A component of the pathname no longer exists.
[`ENOMEM`]
	Insufficient memory is available.
[`ERANGE`]
	The size argument is less than the length of the working directory name. Allocate a bigger array and try again.

Notes

The wgetcwd function returns the default working directory as c: \private \XXXXXXXX (where XXXXXXXX is the UID of the process) as the default session path is initialised to c: \private\current_process’_UID, in case of symbian.

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