static_inline bool ptr_token_to_idx()

in include/yyjson/yyjson.c [1890:1910]

• 21 lines of code
• 11 McCabe index (conditional complexity)

static_inline bool ptr_token_to_idx(const char *cur, usize len, usize *idx) {
    const char *end = cur + len;
    usize num = 0, add;
    if (unlikely(len == 0 || len > USIZE_SAFE_DIG)) return false;
    if (*cur == '0') {
        if (unlikely(len > 1)) return false;
        *idx = 0;
        return true;
    }
    if (*cur == '-') {
        if (unlikely(len > 1)) return false;
        *idx = USIZE_MAX;
        return true;
    }
    for (; cur < end && (add = (usize)((u8)*cur - (u8)'0')) <= 9; cur++) {
        num = num * 10 + add;
    }
    if (unlikely(num == 0 || cur < end)) return false;
    *idx = num;
    return true;
}