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pathname.c
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C/C++ Source or Header
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1992-05-06
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/* pathname.c - expand a file's pathname */
/***************************************************************************
ExpandPath - general-purpose function to expand a pathname
Usage:
(void) ExpandPath (shortname, fullname);
By: Tim Holloway
Date Written: December 25, 1986
Change History: none
Copyright (C) 1986, by Tim Holloway. May be freely distributed,
as long as copyright notice is not removed.
Description: Takes an AmigaDOS filename and expands it to a
full file path description. I.e: "xxx" to "VOLxxx/yyy/zzz/.../xxx"
Any legal AmigaDOS filename may be used. If the name is null,
returns the path name of the current directory (under 1.2 AmigaDOS,
at least - this is an undocumented feature of the Lock function).
If the named file does not exist or an error occurred, returns a
null string as the expanded pathname.
***************************************************************************/
#include "exec/types.h"
#include "exec/memory.h"
#include "libraries/dos.h"
struct FileInfoBlock fib;
typedef ULONG LOCK;
static int
parent_name(xlock, longname)
LOCK xlock;
char *longname;
{
LOCK ylock;
register int i, j;
ylock = ParentDir (xlock);
if (ylock == 0) return 0;
i = parent_name(ylock, longname);
if (!Examine(ylock, &fib))
{
return 0;
}
strcpy (longname+i, fib.fib_FileName);
j = i+strlen(fib.fib_FileName);
if (i == 0)
longname[j++] = ':'; /* root directory is special */
else
longname[j++] = '/';
UnLock (ylock);
/* printf ("Concatenated to create %s\n", longname); */
return j;
}
ExpandPath(shortname, longname)
char *shortname, *longname;
{
register int i;
LOCK pathlock;
longname[0] = '\0';
if ( (pathlock=Lock(shortname, ACCESS_READ)) == 0)
{
return;
}
i = parent_name(pathlock, longname);
if (!Examine(pathlock, &fib))
{
return;
}
strcpy (longname+i, fib.fib_FileName);
UnLock (pathlock);
}
#ifdef TESTMODE
main(argc, argv)
int argc;
char *argv[];
{
char full_name[128];
printf ("expand pathname: %s\n", argv[1]);
ExpandPath(argv[1], full_name);
printf ("expanded name is '%s'\n", full_name);
}
#endif