'Rename' Library Function?

[Conor P. Cahill]

In article <[157]unix at oldcolo.UUCP>, dave at oldcolo.UUCP (Dave Hughes) writes:
> WHen I try to compile an indexing program written on a Mac (AIX I think)
							      ^^^ AUX?
> system, which has a 'rename' library function, it bombs on that function,
> returning an 'unresolved external' error on _rename.

The problem is due to the fact that AUX is *probably* BSD based and has the
rename(2) system call.  This system call is not available in plain jane 
system V systems.  Although xenix is not plain jane system V, it is not 
based upon BSD and does not include the rename system call.

> It is used - and needed - in the following type of use:
> 
>     char oldname[32], finalname[65];                                   
>     sprintf (oldname, "x%dk0", generation_number);                     
>     sprintf (finalname, "%s.k", doc_filename);                         
>     if (rename (oldname, finalname))                                   
>         printf ("Sorry -- error in renaming file %s to %s!\n", oldname,
>                 finalname);                                            

You neet to write a rename function that should do the following:

	rename(src,tgt)
		char		* src;
		char		* tgt;
	{
		if( (link(src,tgt) == -1) ||  (unlink(src) == -1) )
			return(-1);
		return(0);
	}


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