p[2] == '\n')
pnm_space(p[2]) )
static int pnm_probe(AVProbeData *pd){    const char *p = pd->buf;    if (pd->buf_size >= 8 &&        p[0] == 'P' &&        p[1] >= '4' && p[1] <= '6' &&        p[2] == '\n')        return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */    else        return 0;}