SERIN string match?

astropaul

Hi,
I am processing SERIN data, and want to perform a different task depending on the incoming command.
Say my command is "get temp" or "put led,1"
So the first 3 chars could be get or put. How can I match on the first three chars?

IF buffer(3) = "get"

doesn't work. It only wants to process the first byte of the array.
How do I compare multi byte strings?
Thanks,
Paul

Bruce Bates

Paul -

PBASIC has very little in the way of string handling. Why not just limit the command to one character ("G" or "P") that simplifies the process immensely.

Regards,

Bruce Bates

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Tracy Allen

Two characters as a command are pretty easy, too, as you can define word size constants that consist of two bytes but compare as one word:

[noparse][[/noparse]code]GT CON "G'" * 256 + "T" ' command "%GT", "%" is command tag
PL CON "P" * 256 + "L" ' "%PL"

command VAR word
cmd0 VAR command.byte0 ' alias byte 0
parameter VAR word


DEBUGIN WAIT("%"),STR cmd0\4 ' reads in both command and parameter words
LOOKDOWN command,[noparse][[/noparse]GT,L1],cmd0 ' convert to index
BRANCH cmd0,...... ' branch on index, parameter intact[noparse][[/noparse]/tag]

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Tracy Allen
www.emesystems.com