18 lines
576 B
Plaintext
18 lines
576 B
Plaintext
|
%% 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!
|