10-13-2009
Can you post:
1) The format of the original file with sample data, making it clear whether there are field delimiters and which field is the "ID".
2) Estimate the maximum number of IDs.
3) Sample IDs - expecially if they are variable length and could be contained within another ID (e.g. "foobar" and "myfoobar")
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LEARN ABOUT SUSE
ieee1284_get_deviceid
IEEE1284_GET_DEVICEI(3) Functions IEEE1284_GET_DEVICEI(3)
NAME
ieee1284_get_deviceid - retrieve an IEEE 1284 Device ID
SYNOPSIS
#include <ieee1284.h>
ssize_t ieee1284_get_deviceid(struct parport *port, int daisy, int flags, char *buffer, size_t len);
DESCRIPTION
This function is for retrieving the IEEE 1284 Device ID of the specified device. The device is specified by the port to which it is
attached, and optionally an address (daisy) on the daisy chain of devices on that port.
daisy should be -1 to indicate that the device is not participating in a IEEE 1284.3 daisy chain, meaning it is the last (or only) device
on the port, or should be a number from 0 to 3 inclusive to indicate that it has the specified daisy chain address (0 is next to the port).
The flags parameter should be a bitwise union of any flags that the program wants to use. Available flags are:
F1284_FRESH
Guarantee a fresh Device ID. A cached or OS-provided ID will not be used.
The provided buffer must be at least len bytes long, and will contain the Device ID including the initial two-byte length field and a
terminating zero byte on successful return, or as much of the above as will fit into the buffer.
RETURN VALUE
A return value less than zero indicates an error as below. Otherwise, the return value is the number of bytes of buffer that have been
filled. A return value equal to the length of the buffer indicates that the Device ID may be longer than the buffer will allow.
E1284_NOID
The device did not provide an IEEE 1284 Device ID when interrogated (perhaps by the operating system if F1284_FRESH was not specified).
E1284_NOTIMPL
One or more of the supplied flags is not supported in this implementation, or if no flags were supplied then this function is not
implemented for this type of port or this type of system. This can also be returned if a daisy chain address is specified but daisy
chain Device IDs are not yet supported.
E1284_NOTAVAIL
F1284_FRESH was specified and the library is unable to access the port to interrogate the device.
E1284_NOMEM
There is not enough memory.
E1284_INIT
There was a problem initializing the port.
E1284_INVALIDPORT
The port parameter is invalid.
NOTES
Unless the F1284_FRESH flag is given, the library will try to find the device's ID as unobtrusively as possible. First it will ask the
operating system if it knows it, and then it will try actually asking the device for it. Because of this, the Device ID may be partially
computed (the length field, for example) or even partially missing if the operating system has only remembered some parts of the ID. To
guarantee that you are getting the bytes that the device sent, use F1284_FRESH. Be aware that the operating system may allow any user to
inspect the Device IDs that it provides, whereas device access is normally more restricted.
The initial two-byte length field is a big-endian 16 bit unsigned integer provided by the device and may not be accurate. In particular, it
is meant to indicate the length of the entire string including the length field itself; however, some manufacturers exclude the length
field or just set the length field to some arbitrary number greater than the ID length.
AUTHOR
Tim Waugh <twaugh@redhat.com>
Author.
COPYRIGHT
Copyright (C) 2001-2003 Tim Waugh
09/18/2007 IEEE1284_GET_DEVICEI(3)