4 Jul 09:30
strange behaviour with luaL_checkinteger()
From: matthias <mensch0815 <at> googlemail.com>
Subject: strange behaviour with luaL_checkinteger()
Newsgroups: gmane.comp.lang.lua.general
Date: 2009-07-04 07:31:10 GMT
Subject: strange behaviour with luaL_checkinteger()
Newsgroups: gmane.comp.lang.lua.general
Date: 2009-07-04 07:31:10 GMT
Hi all, I wrote my own Lua-crc function and got some weired results. For proofing correctness I also implemented a c-program. But when the c-program returned a negative value (with %d) I got a different value from the Lua-library. My algorithm is quite similar to the one from lash-lua: http://code.google.com/p/lash-lua/source/browse/trunk/crc32.c?spec=svn5&r=5#112 Although I got the data with the luaL_checkinteger()-function. Seems that there lies the problem, but I don't get what I've done wrong. Inside Lua every number is a floating-point. So when I call my library function from a Lua-script I pass the value converting it to a number. Therefore a floatingpoint number should be on the stack and I "cast " it into my c- integer variable with the check integer-function. But representation of integer-values shouldn't be a problem (http://lua-users.org/wiki/FloatingPoint). In the c-program I pass the value via atoi()-function call from argv[] which shouldn't be a problem, too. Can anyone give me a hint, what I am missing. Thanks Matthias -- -- motzblog.wordpress.com(Continue reading)
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