Function char_to_string

src/rustDemangle.cpp:497–536

#define ESCAPED_SIZE 12

static NODISCARD size_t char_to_string(uint32_t ch, uint8_t quote, bool first, char (*buf)[ESCAPED_SIZE]) {
    // encode the character
    char *escaped_buf = *buf;
    escaped_buf[0] = '\\';
    size_t escaped_len = 2;
    switch (ch) {
        case '\0':
        escaped_buf[1] = '0';
        break;
        case '\t':
        escaped_buf[1] = 't';
        break;
        case '\r':
        escaped_buf[1] = 'r';
        break;
        case '\n':
        escaped_buf[1] = 'n';
        break;
        case '\\':
        escaped_buf[1] = '\\';
        break;
        default:
        if (ch == quote) {
            escaped_buf[1] = ch;
        } else if (!unicode_isprint(ch) || (first && unicode_isgraphemextend(ch))) {
            int hexlen = snprintf(escaped_buf, ESCAPED_SIZE, "\\u{%x}", (unsigned int)ch);
            if (hexlen < 0) {
                return 0; // (snprintf shouldn't fail!)
            }
            escaped_len = hexlen;
        } else {
            // printable character
            escaped_buf[0] = ch;
            escaped_len = 1;
        }
        break;
    }

    return escaped_len;
}

// convert nibbles to a single/double-quoted string
static NODISCARD nibbles_to_string_status nibbles_to_string(const char *buf, size_t len, uint8_t *out, size_t *out_len) {