git: 9front

ref: ebe6d3db18f1539262f7660c74886b64c90cbf88
dir: /sys/src/libc/port/utfrune.c/

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#include <u.h>
#include <libc.h>

char*
utfrune(char *s, long c)
{
	long c1;
	Rune r;
	int n;

	if(c < Runesync)		/* not part of utf sequence */
		return strchr(s, c);

	for(;;) {
		c1 = *(uchar*)s;
		if(c1 < Runeself) {	/* one byte rune */
			if(c1 == 0)
				return 0;
			if(c1 == c)
				return s;
			s++;
			continue;
		}
		n = chartorune(&r, s);
		if(r == c)
			return s;
		s += n;
	}
}