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FCB Open : check if files are already open.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@675
This commit is contained in:
Ulf Wohlers 2003-02-21 20:20:19 +00:00
parent 4b7d20886e
commit 4ec9803c4f
1 changed files with 21 additions and 0 deletions
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21
src/dos/dos_files.cpp
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@ -656,6 +656,27 @@ bool DOS_FCBOpen(Bit16u seg,Bit16u offset) {
DOS_FCB fcb(seg,offset);
char shortname[DOS_FCBNAME];Bit16u handle;
fcb.GetName(shortname);
/* First check if the name is correct */
Bit8u drive;
char fullname[DOS_PATHLENGTH];
if (!DOS_MakeName(shortname,fullname,&drive)) return false;
/* Check, if file is already opened */
for (Bit16u i=0;i<DOS_FILES;i++) {
DOS_PSP psp(dos.psp);
if (Files[i] && Files[i]->IsOpen() && Files[i]->IsName(fullname)) {
handle = psp.FindEntryByHandle(i);
if (handle==0xFF) {
// This shouldnt happen
LOG_ERROR("DOS: File %s is opened but has no psp entry.",shortname);
return false;
}
fcb.FileOpen((Bit8u)handle);
return true;
}
}
if (!DOS_OpenFile(shortname,2,&handle)) return false;
fcb.FileOpen((Bit8u)handle);
return true;