85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/* $XConsortium: qualify.c /main/3 1995/10/27 16:14:33 rswiston $ */
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/* *
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* (c) Copyright 1993, 1994 Hewlett-Packard Company *
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* (c) Copyright 1993, 1994 International Business Machines Corp. *
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* (c) Copyright 1993, 1994 Sun Microsystems, Inc. *
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* (c) Copyright 1993, 1994 Novell, Inc. *
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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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* qualifyWithFirst
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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/opt/dt:/opt/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. It is the responsibility
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* of the calling function to dispose of the space.
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**********************************************************************/
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char * qualifyWithFirst
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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 = strdup(searchPath);
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char * savepaths = paths;
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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 */
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if (filename == NULL || searchPath == NULL)
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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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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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/* it's there so close it, .... */
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fclose(f);
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/* ... restore the colon, .... */
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if (path)
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*path = ':';
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/* return the fully qualified filename */
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free(savepaths);
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return chance;
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}
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free(chance);
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/* reached the end of the list of paths */
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if (path == NULL)
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break;
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/* try the next path */
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paths = path + 1;
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}
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free(savepaths);
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return NULL;
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}
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