Category : C Source Code
Archive   : FILE_IO.ZIP
Filename : TRUENAME.C

/*
Copyright 1991 by David Thielen, All Rights Reserved.

This code example is from a commercial product and has restricted
rights. This code, or any code derived from this code may be
incorporated into any programs with the following restrictions;
1) It cannot be sold as source code, and 2) It cannot be sold in a
product which provides this code as an API.
*/


#include "file_io.h"
#include "string.h"

// Convert the file name in pFile to the true name (elim append, join, &
// subst) and put it in pTrue. On an error, will return the passed in
// name.

unsigned FileTrueName (BYTE const *pFile,BYTE *pTrue)
{
unsigned uRtn;

#ifdef DEBUG
if ((! pFile) || (! pTrue) || (! *pFile))
DebugPrintf ("TrueName (%s(%X), (%X))\n", pFile, pFile, pTrue);
memset (pTrue, '$', 128);
#endif

// Before DOS 3 - can't do it.
// Return the passed in name so you have something
if (DosMajVer < 3)
{
strcpy (pTrue, pFile);
return (-1);
}

*pTrue = 0;
_asm
{
mov ax, 6000h
mov si, [pFile]
mov di, [pTrue]
push ds
pop es
int 21h // Convert file name
mov [uRtn], ax
jc dne
mov [uRtn], 0
dne:
}

if (uRtn)
strcpy (pTrue, pFile);
return (uRtn);
}