Function jl_decode_utf8

src/cli/config_json_like.c:1726–1770

}

static int jl_decode_utf8(const unsigned char *text, size_t remaining, uint32_t *codepoint,
                          size_t *byte_count) {
    if (remaining == 0U) {
        return -1;
    }
    unsigned char first = text[0];
    if (first < 0x80U) {
        *codepoint = first;
        *byte_count = 1U;
        return 0;
    }
    size_t count = 0;
    uint32_t value = 0;
    uint32_t minimum = 0;
    if (first >= 0xC2U && first <= 0xDFU) {
        count = 2U;
        value = first & 0x1FU;
        minimum = 0x80U;
    } else if (first >= 0xE0U && first <= 0xEFU) {
        count = 3U;
        value = first & 0x0FU;
        minimum = 0x800U;
    } else if (first >= 0xF0U && first <= 0xF4U) {
        count = 4U;
        value = first & 0x07U;
        minimum = 0x10000U;
    } else {
        return -1;
    }
    if (remaining < count) {
        return -1;
    }
    for (size_t i = 1U; i < count; i++) {
        if ((text[i] & 0xC0U) != 0x80U) {
            return -1;
        }
        value = (value << 6U) | (text[i] & 0x3FU);
    }
    if (value < minimum || value > 0x10FFFFU || (value >= 0xD800U && value <= 0xDFFFU)) {
        return -1;
    }
    *codepoint = value;
    *byte_count = count;
    return 0;
}

static int jl_validate_utf8(const char *text, size_t length) {
    size_t pos = 0;