src/libutf/find.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

#include "internal.h"

byte*
utf8·find(byte* s, rune c)
{
    long c1;
    rune r;
    int  n;

    if(c < Tx)
        return strchr(s, c);

    for(;;){
        c1 = *(ubyte*)s;
        if(c1 < Tx){
            if(c1 == 0) return nil;
            if(c1 == c) return s;
            s++;
            continue;
        }

        n = utf8·decode(s, &r);

        if(r == c)
            return s;

        s += n;
    }

    return nil;
}