liquidex/treehouse
liquidex/treehouse
1
Fork 0
Code Issues 39 Activity

add a note on prefix matches with C strings

Browse source
This commit is contained in:
liquidex 2024-11-12 14:52:19 +01:00
parent 0b0c0a4de4
commit b49f11657d
2 changed files with 21 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
content/programming.tree
View file

@ -13,6 +13,10 @@
id = "01J4J4PAXRWZDP9PAZNGCQ9S3D" id = "01J4J4PAXRWZDP9PAZNGCQ9S3D"
+ [featured]{.badge .blue} :page: haku - writing a little programming language for fun + [featured]{.badge .blue} :page: haku - writing a little programming language for fun
% content.link = "programming/blog/cstring-starts-with"
id = "01JCGAM56KS2C6D4XZ1MRATXH4"
+ :page: prefix matches with C strings
% content.link = "programming/blog/buildsome" % content.link = "programming/blog/buildsome"
id = "01J7BYKQHZKYQ969T3PH3V8HF1" id = "01J7BYKQHZKYQ969T3PH3V8HF1"
+ :page: not quite buildless + :page: not quite buildless

17
content/programming/blog/cstring-starts-with.tree Normal file
View file

@ -0,0 +1,17 @@
%% title = "prefix matches with C strings"
% id = "01JCGAM55352EF247HZ358BAJ8"
- one thing I realised while reading some code at work that worked with C strings: it's surprising how easy it is to match a prefix on a C string.
```c
if (s != NULL
&& s[0] == 'h'
&& s[1] == 'u'
&& s[2] == 'g')
{
// ...
}
```
% id = "01JCGAM5537WYE3GEN6WGX8WD0"
- this works because of the NUL terminator---if it appears at any point in the string, the `s[i] == c` comparison will return `false`, thus breaking the `&&` chain---so indices always stay in-bounds!