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64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* $Xorg: DisName.c,v 1.4 2001/02/09 02:03:32 xorgcvs Exp $ */
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/*
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Copyright 1994, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* $XFree86: xc/lib/X11/DisName.c,v 1.3 2003/04/13 19:22:15 dawes Exp $ */
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/* XDisplayName.c */
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/*
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* Returns the name of the display XOpenDisplay would use. This is better
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* than just printing the "display" variable in a program because that
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* could be NULL and/or there could be an environment variable set.
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* This makes it easier for programmers to provide meaningful error
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* messages.
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*
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*
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* For example, this is used in XOpenDisplay() as
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* strncpy( displaybuf, XDisplayName( display ), sizeof(displaybuf) );
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* if ( *displaybuf == '\0' ) return( NULL );
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* This check is actually unnecessary because the next thing is an index()
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* call looking for a ':' which will fail and we'll return(NULL).
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*/
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/* Written at Waterloo - JMSellens */
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#include <stdio.h>
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#include <stdlib.h>
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#include "Xlib.h"
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char *
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XDisplayName(
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_Xconst char *display)
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{
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char *d;
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if ( display != (char *)NULL && *display != '\0' )
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return( (char *)display );
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if ( (d = getenv( "DISPLAY" )) != (char *)NULL )
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return( d );
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return( "" );
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}
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