Function text_decode_utf8

src/cli/config_text_edit.c:166–212

}

static int text_decode_utf8(const unsigned char *text, size_t remaining, uint32_t *codepoint,
                            size_t *byte_count) {
    if (!text || !codepoint || !byte_count || remaining == 0U) {
        return TEXT_ERROR;
    }
    unsigned char first = text[0];
    if (first <= 0x7fU) {
        *codepoint = first;
        *byte_count = 1U;
        return TEXT_OK;
    }

    size_t count;
    uint32_t value;
    uint32_t minimum;
    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 TEXT_ERROR;
    }
    if (count > remaining) {
        return TEXT_ERROR;
    }
    for (size_t i = 1U; i < count; i++) {
        unsigned char next = text[i];
        if ((next & 0xc0U) != 0x80U) {
            return TEXT_ERROR;
        }
        value = (value << 6U) | (uint32_t)(next & 0x3fU);
    }
    if (value < minimum || value > 0x10ffffU || (value >= 0xd800U && value <= 0xdfffU)) {
        return TEXT_ERROR;
    }
    *codepoint = value;
    *byte_count = count;
    return TEXT_OK;
}

static int text_validate_bytes(const char *data, size_t len, int allow_initial_bom) {
    if (!data && len != 0U) {