| --- Log opened Tue Apr 30 00:00:41 2013 |
| --- Day changed Tue Apr 30 2013 |
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| 11:23 | | * TheWatcher sighs at this 'scanf("%s", buffer)' in a student's code, sets forth to give them The Lecture. |
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| 11:25 | < AverageJoe> | its supposed to be 'scanf("%s", &buffer)' right? |
| 11:25 | < Hermit> | More like, "don't use scanf"? |
| 11:25 | <@Azash> | AverageJoe: scanf has no length specifier iirc |
| 11:26 | <@Azash> | It's a great way to put overflows into your code |
| 11:26 | < AverageJoe> | oh yeah |
| 11:26 | < AverageJoe> | derp |
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| 11:29 | < AverageJoe> | Azash, what if buffer is defined as a *char with no set size? then its ok right? like char *buffer instead of char buffer[32] |
| 11:29 | <@Azash> | Yeah but it still has to have some memory allocated to it |
| 11:30 | <@Azash> | I'm not entirely sure how arrays work in C actually, I prefer using raw pointers.. |
| 11:30 | <@Azash> | But like, you allocate a certain amount of memory and assign it to the pointer |
| 11:30 | <@Azash> | Without length checking you can still go past the allocated memory |
| 11:34 | <@TheWatcher> | AverageJoe: `char *buffer; scanf("%s", buffer);` is even worse, as that's telling it to read from stdin into /a completely random location in your process' address space/. Doing `char *buffer; scanf("%s", &buffer);` will do hilarious things too - any sane compiler will give a warning that you're passing it the wrong argument, because what you're saying there is 'read bytes from stdin, and make buffer point to the address in memory specified by |
| 11:34 | <@TheWatcher> | the first sizeof(char *) bytes... oh, and then continue to trash the stack after that, writing the remaining bytes over it' |
| 11:35 | < AverageJoe> | i see |
| 11:35 | < AverageJoe> | thanks denis ritchie |
| 11:36 | <@TheWatcher> | glibc lets you do `char *buffer; scanf("%as", &buffer)` - that'll allocate a buffer large enough to store the input, and then place the pointer to it in buffer, but that's glibc specific. |
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| 17:13 | <&McMartin> | Light Table 0.4 is out, now eats Python |
| 17:13 | <&McMartin> | Also apparently does amazing things with JS that I am not good enough with JS to evaluate |
| 17:14 | <&McMartin> | http://www.chris-granger.com/2013/04/28/light-table-040/ |
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| 17:56 | | * Derakon_ ponders Pyrel, and specifically, creature spellcasting. |
| 17:56 | | You're now known as TheWatcher |
| 17:56 | < Derakon_> | In Angband, the spells a creature has access to are a basic part of the creature record in the data files. |
| 17:57 | < Derakon_> | Of course, Angband does everything "in the engine", so this is more or less reasonable. |
| 17:57 | < Derakon_> | In Pyrel, spells are only relevant from within the creature's AI code, which is run as a script separate from the rest of the engine. |
| 17:57 | < Derakon_> | So I don't think it's so reasonable to have them be explicitly mentioned in the creature record template. |
| 17:58 | < Derakon_> | (What's more, I may later want to have other associated scripts with their own metadata that needs to be stored in the record, and I don't want to be extending the template every time this happens) |
| 17:58 | < Derakon_> | So what I'm thinking is, attach a "general-purpose data" section to the creature record, and any data that the engine doesn't care about can go here. |
| 17:59 | < Derakon_> | The engine will make certain that data is preserved but won't interpret it otherwise; scripts can do what they please with it. |
| 17:59 | < Derakon_> | Any better suggestions? |
| 17:59 | < Derakon_> | It does bug me a bit to be basically sticking an amorphous glob into the creature record template. |
| 18:00 | <@TheWatcher> | How do you currently implement spells, as separate scripts too, I guess? |
| 18:00 | < Derakon_> | Currently the only magic is effects attached to consumable items, which are implemented as their own separate scripts, yes. |
| 18:01 | < Derakon_> | But I don't really want to go entirely that route with creature spellcasting since the AI needs to guide spells in various ways. |
| 18:01 | < Derakon_> | (In terms of selection, targeting, etc.) |
| 18:07 | <&ToxicFrog> | McMartin: I should try LT for Clojure at some point, shouldn't I. |
| 18:09 | <&ToxicFrog> | Derakon_: I don't think I fully understand the engine vs. non-engine distinction. What are the templates? |
| 18:09 | | ToxicFrog is now known as ToxicFrog|W`rkn |
| 18:09 | <&McMartin> | TF: LT covers Python and JS now, and is apparently really cool at JS~ |
| 18:10 | < Derakon_> | TF: well, for example, here's one creature record: http://pastebin.com/rqRy0Mch |
| 18:11 | < Derakon_> | Every root-level string is specifically recognized by the engine code. |
| 18:11 | < Derakon_> | It doesn't necessarily use all the values pointed to by those strings (e.g. "BASH_DOOR" would be a flag used by the AI script to determine if doors can be broken open by this creature). |
| 18:12 | < Hermit> | You pick the lock. The door explodes. |
| 18:12 | < Derakon_> | So I could add a new root-level key "spells" that would point to a list of spell definitions. |
| 18:12 | < Derakon_> | That's basically mirroring what Angband does. |
| 18:12 | < Shiz> | I prefer BACK_DOOR |
| 18:12 | <&ToxicFrog|W`rkn> | McMartin: of those three, the only one I actually use on a regular basis is Clojure, so |
| 18:13 | <&McMartin> | Ah, so |
| 18:13 | < Derakon_> | But then if I want to have additional arbitrary metadata (e.g. what if some creatures come with set equipment?) I'd have to make yet another root-level key. |
| 18:13 | < Derakon_> | And every time I do that the code in the engine that parses these records has to be modified and extended. |
| 18:13 | <&ToxicFrog|W`rkn> | Derakon_: why? I mean, this looks like it's a basic map, why can't the engine just ignore keys it doesn't recognize? |
| 18:13 | < Derakon_> | So it doesn't seem like a very flexible approach. |
| 18:13 | <&ToxicFrog|W`rkn> | it what |
| 18:13 | <&ToxicFrog|W`rkn> | why |
| 18:13 | < Derakon_> | ... |
| 18:14 | < Derakon_> | Hm, you may be right. |
| 18:14 | < Derakon_> | I guess the only place in which all strings are enumerated right now is in the code that declares how we serialize creature records, and that's just so that things look nice in the data files. |
| 18:15 | < Derakon_> | So yeah, you could just stick arbitrary data in there and it could all get lumped in at the end when serializing. |
| 18:15 | < Derakon_> | Okay, thanks for setting me straight. :) |
| 18:16 | <&ToxicFrog|W`rkn> | \o/ |
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| 23:47 | <@Alek> | you know when it's time to stop coding and go to bed? |
| 23:47 | <@celticminstrel> | Never! |
| 23:47 | <@Alek> | when you're chatting and finish all your lines with ; |
| 23:47 | <@celticminstrel> | XD |
| 23:47 | <@Alek> | find no errors, and send it off. |
| --- Log closed Wed May 01 00:00:59 2013 |