#include <stdint.h>
#include <string.h>
#include <stdio.h>

typedef uint32_t rune;
//typedef char rune;

#if 0
State 0:
       on #\s                   goto 4
       on (- T #\s)             goto 0
       on :EOF                  goto 0

State 4:
       on #\u                   goto 5
       on (- T (OR #\s #\u))    goto 0
       on #\s                   goto 4
       on :EOF                  goto 0

State 5:
       on #\n                   goto 6
       on (- T (OR #\n #\s))    goto 0
       on #\s                   goto 4
       on :EOF                  goto 0

State 6:
       on :EXIT                 goto 2 do (PSETQ $0.S (- P 3) $0.E P)
#endif

size_t sun (const rune * restrict buf, size_t n)
{
  size_t p = 0;

 L0:
  if (p == n) return (size_t)-1;
  switch (buf[p++])
    {
    case 's': goto L4;
    default: goto L0;
    }

 L4:
  if (p == n) return (size_t)-1;
  switch (buf[p++])
    {
    case 'u': goto L5;
    case 's': goto L4;
    default: goto L0;
    }

 L5:
  if (p == n) return (size_t)-1;
  switch (buf[p++])
    {
    case 'n': goto L6;
    case 's': goto L4;
    default: goto L0;
    }

 L6:
  return p;
}