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From: rogers@iris.ucdavis.edu (Brewski Rogers)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Is there a routine to generate full-path names?
Summary: yes
Message-ID: <6522@ucdavis.ucdavis.edu>
Date: 22 Jan 90 03:10:29 GMT
References: <1271.AA1271@noel>
Sender: uucp@ucdavis.ucdavis.edu
Reply-To: rogers@iris.ucdavis.edu (Brewski Rogers)
Organization: U.C. Davis - Department of Electrical Engineering and Computer Science
Lines: 111

In article <1271.AA1271@noel> greg@noel.CTS.COM (J. Gregory Noel) writes:
>I badly need a routine that will convert an arbitrary path name into its
>equivalent full-path name.  That is, I need a routine that will take a
>name like "SYS:C" and return "System:1.3/C" if that is where the directory
>actually is.  It would be handy if the routine also converted "DF0:name"
>into "Volume:name" of the volume currently in DF0, but that's not essential.
>
..
>Many thanks,
>-- 
>-- J. Gregory Noel, UNIX Guru       greg@noel.cts.com  or  greg@noel.uucp


I had the same problem a couple of weeks ago. Here's the source.
and it does return the volume name, not the device name.
enjoy - Bruce

/*!*******************************************************************
 * FindRoot by Bruce Rogers 1/20/90
 *********************************************************************/
#include <stdio.h>
#include <exec/types.h>
#include <libraries/dos.h>

#define MAXPATHSTRING 140
void    *AllocMem();
char    absDir[MAXPATHSTRING];
char    absDirName[MAXPATHSTRING];

/*!*******************************************************************
 * Kludges disk:name/directory with filename so we can just read it.
 *********************************************************************/
void    DosConcatenate(string1,string2,result)
char    string1[],string2[],result[];
{
short   i,j;

    for(i=0; string1[i] != '\0'; i++)
        result[i]=string1[i];
    if ((result[i-1] != ':') && (result[i-1] != '/') && (i!=0) && string2[0]!=0)
    {
        result[i]='/';
        ++i;
    }
    for(j=0; string2[j] != '\0'; j++)
        result[i+j] = string2[j];
    result[i+j] = '\0';
}

/*!*******************************************************************
 * Recursively go up parent chain, looking for oldest parent.
 * Create the absolute path string as we go.
 *********************************************************************/
SeekRoot(lock)
ULONG   lock;
{
short   i;
struct  FileInfoBlock   *fileInfo;

    fileInfo=AllocMem(sizeof(struct FileInfoBlock),0);

    Examine(lock,fileInfo);
    DosConcatenate(fileInfo->fib_FileName,absDirName,absDir);
    for(i=0;i<MAXPATHSTRING;i++) absDirName[i]=absDir[i];
    lock=ParentDir(lock);
    if (lock!=NULL) SeekRoot(lock);
        
    FreeMem(fileInfo,sizeof(struct FileInfoBlock));
}

/*!*******************************************************************
 * Given a path, sets absDirName equal to the absolute path
 *********************************************************************/
void    MakeAbsName(dirName)
char    *dirName;
{
short   i;
char    tempc[40];
ULONG   lock;

    for(i=0;i<MAXPATHSTRING;i++) absDirName[i]=absDir[i]=0;
    lock=Lock(dirName,ACCESS_READ);
    if (lock==NULL) return;
    SeekRoot(lock);
    for(i=0;i<MAXPATHSTRING;i++)
    {
        if (absDirName[i]=='/')
        {
            absDirName[i]=':';
            break;
        }
    }
}

main(argc,argv)
int     argc;
char    *argv[];
{
char    dirName[100];

    MakeAbsName(argv[1]);
    printf("AbsBasename: %s\n",absDirName);
}


/*
------------------------------------------------------          Quantum _\/_
2727 Eel                   Bruce (6502 RULES!) Rogers        |\  Duck  ( 0 0)
Davis, Ca 95616            Quantum Duck Software,           |\ \______/ / \\\
916-756-2684               rogers@iris.ucdavis.edu         |\ <  <     |   \/
"My brain is on fire!"                                       \________/ Quark!*/