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85
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1 ---
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2 layout: post
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3 author: Paper
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4 title: 'Schism Tracker, Unicode, and you'
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86
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5 nowplaying: 'Holy Fuck - LP'
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85
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6 ---
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7 <span>Recently I've taken on adding real Unicode-awareness to Schism, and it was <i>surprisingly</i> easy, to say the least.</span>
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8 <br><br>
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9 <span>I was expecting to have to convert lots of things to be real Unicode, but nope! All that really needed to be done was to convert UTF-8 to CP437 where necessary to actually *draw* the data while keeping the internal form pure UTF-8, and then bundle everything up into a neat macro to keep everything consistent:</span>
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10 <figure><pre><code>#define CHARSET_EASY_MODE_EX(MOD, in, inset, outset, x) \
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11 do { \
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12 MOD uint8_t* out; \
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13 charset_error_t err = charset_iconv(in, (uint8_t**)&out, inset, outset); \
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14 if (err) \
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15 out = in; \
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16 \
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17 x \
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18 \
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19 if (!err) \
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20 free((uint8_t*)out); \
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21 } while (0)
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22 </code></pre></figure>
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23 <span>I just shoved this macro anywhere necessary and it works perfectly fine for loading any Unicode path. For example, the Spanish word "mañana" gets displayed correctly now:</span>
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24 <br><br>
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25 <img class="drop-shadow-box center-image" src="/media/blog/schism-spanish-file-listing.png">
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26 <br>
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27 <span>The file sorting algorithms were a different beast though, and even now strverscmp doesn't have a real charset-independent variant. For strcasecmp, I had to implement (simple) Unicode case folding, which meant having a <a class="prettylink" href="https://github.com/schismtracker/schismtracker/blob/b858a5917ee7e83f7cb4da1ad698dd24159f241b/schism/charset_data.c#L183">switch statement that is almost 1500 lines long</a> and takes up about 20K of space in the binary.</span>
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28 <br><br>
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29 <span>Schism currently does not do any Unicode normalization when comparing strings. This is primarily a problem with decomposed strings (which will likely not get converted properly), though with filenames that probably shouldn't exist anyway...</span>
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30 <br><br>
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31 <span>anyway, Unicode is easy, if you can't use it properly it's a skill issue :p</span>
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