115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/************************************<+>*************************************
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****************************************************************************
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**
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** File: Qualify.c
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**
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** RCS: $XConsortium: Qualify.c /main/3 1995/10/26 15:09:47 rswiston $
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**
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** Project: DT
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**
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** Description: Fully qualify a file with the first path found
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** in a list of colon-separated paths
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**
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** (c) Copyright 1993 by Hewlett-Packard Company
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**
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****************************************************************************
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************************************<+>*************************************/
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#include <stdio.h>
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#include <string.h>
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/*********************************************************************
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* _DtQualifyWithFirst
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*
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* takes: an unqualified filename like foo.txt, and
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* a colon-separated list of pathnames, such as
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* /etc/dt:/usr/dt/config
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*
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* returns: a fully qualified filename. Space for the filename
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* has been allocated off the heap using malloc. It is
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* the responsibility of the calling function to dispose
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* of the space using free.
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*
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* example: ...
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* char * filename;
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* ...
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* filename = _DtQualifyWithFirst("configFile",
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* "/foo/first/location:/foo/second/choice");
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* < use filename >
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* free(filename);
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*
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**********************************************************************/
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char * _DtQualifyWithFirst
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(
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char * filename,
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char * searchPath
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)
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{
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char * paths = searchPath;
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char * path;
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char * chance;
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FILE * f;
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/* assert that the arguments cannot be NULL and cannot be empty */
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if (filename == NULL || searchPath == NULL ||
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filename[0] == 0 || searchPath[0] == 0)
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return NULL;
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while (1) {
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/* if there is a :, zero it */
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if ((path = strchr(paths, ':')) != NULL)
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*path = 0;
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/* allocate space and create the qualified filename */
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chance = (char *)malloc(strlen(paths) + strlen(filename) + 2);
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if (filename[0] == '/')
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sprintf(chance,"%s%s",paths,filename);
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else
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sprintf(chance,"%s/%s",paths,filename);
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/* see if it is there by opening it for reading */
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if (f = fopen(chance,"r")) {
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fclose(f); /* it's there so close it, .... */
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if (path) /* ... restore the colon, .... */
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*path = ':';
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return chance; /* return the fully qualified filename */
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}
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free(chance);
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if (path == NULL) /* reached the end of the list of paths */
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break;
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*path = ':'; /* restore the colon */
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paths = path + 1; /* try the next path */
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}
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return NULL;
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}
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