conterm/libc/utfrune.c

31 lines
401 B
C

#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;
}
return 0;
}