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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _chdir function changes the current working directory to the
     directory specified by <dirname>. The <dirname> argument must
     refer to an existing directory.
 
     This function can change the current working directory on any
     drive; it cannot change the default drive itself. For example, if
     A: is the default drive and \BIN is the current working
     directory, the following call changes the current working
     directory for drive C:
 
          _chdir("c:\\temp");
 
     Note that you must place two backslashes (\\) in a C string in
     order to represent a single backslash (\). The backslash is the
     escape character for C strings and therefore requires special
     handling.
 
     This function call has no apparent immediate effect. However, when
     the _chdrive function is called to change the default drive to C:,
     the current working directory becomes C:\TEMP.
 
     With DOS, the new directory set by the program becomes the new
     current working directory.
 
     Return Value
 
     The _chdir function returns a value of 0 if the working directory
     is successfully changed. A return value of -1 indicates an error,
     in which case errno is set to ENOENT, indicating that the
     specified path name could not be found.
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