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.help zfxdir May84 "System Interface"
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NAME
zfxdir -- extract OS directory prefix from OSFN
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SYNOPSIS
.nf
zfxdir (osfn, osdir, maxch, status)
char osfn[ARB] # OS filename
char osdir[maxch] # OS directory prefix
int maxch, status
.fi
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DESCRIPTION
The OS directory prefix, if any, is extracted from the OS filename
and returned as \fIosdir\fR.
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RETURN VALUE
ERR is returned if the output string overflows. If \fIosfn\fR is null
or does not contain a directory prefix a status of zero is returned,
otherwise the number of characters in the output string is returned.
If there is no directory prefix the null string is returned in \fIosdir\fR.
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NOTES
This routine is normally written in SPP since it does not communicate with
the host system. Character string arguments are therefore not packed.
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SEE ALSO
zfpath, zfsubd, zfgcwd
.endhelp
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