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Rev 3707 Rev 4011
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    else
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    else
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        printf("cpu: halted\n");
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        printf("cpu: halted\n");
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    cpu_halt();
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    cpu_halt();
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}
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}
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/** Return number of characters in a string.
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 *
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 * @param str NULL terminated string.
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 *
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 * @return Number of characters in str.
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 */
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size_t strlen(const char *str)
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{
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    int i;
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    for (i = 0; str[i]; i++)
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        ;
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    return i;
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}
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/** Compare two NULL terminated strings
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 *
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 * Do a char-by-char comparison of two NULL terminated strings.
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 * The strings are considered equal iff they consist of the same
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 * characters on the minimum of their lengths.
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 *
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 * @param src First string to compare.
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 * @param dst Second string to compare.
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 *
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 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
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 *
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 */
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int strcmp(const char *src, const char *dst)
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{
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    for (; *src && *dst; src++, dst++) {
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        if (*src < *dst)
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            return -1;
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        if (*src > *dst)
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            return 1;
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    }
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    if (*src == *dst)
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        return 0;
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    if (!*src)
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        return -1;
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    return 1;
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}
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/** Compare two NULL terminated strings
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 *
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 * Do a char-by-char comparison of two NULL terminated strings.
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 * The strings are considered equal iff they consist of the same
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 * characters on the minimum of their lengths and specified maximal
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 * length.
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 *
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 * @param src First string to compare.
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 * @param dst Second string to compare.
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 * @param len Maximal length for comparison.
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 *
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 * @return 0 if the strings are equal, -1 if first is smaller, 1 if second smaller.
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 *
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 */
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int strncmp(const char *src, const char *dst, size_t len)
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{
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    unsigned int i;
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    for (i = 0; (*src) && (*dst) && (i < len); src++, dst++, i++) {
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        if (*src < *dst)
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            return -1;
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        if (*src > *dst)
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            return 1;
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    }
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    if (i == len || *src == *dst)
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        return 0;
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    if (!*src)
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        return -1;
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    return 1;
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}
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/** Copy NULL terminated string.
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 *
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 * Copy at most 'len' characters from string 'src' to 'dest'.
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 * If 'src' is shorter than 'len', '\0' is inserted behind the
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 * last copied character.
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 *
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 * @param src Source string.
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 * @param dest Destination buffer.
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 * @param len Size of destination buffer.
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 */
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void strncpy(char *dest, const char *src, size_t len)
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{
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    unsigned int i;
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    for (i = 0; i < len; i++) {
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        if (!(dest[i] = src[i]))
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            return;
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    }
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    dest[i-1] = '\0';
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}
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/** Convert ascii representation to unative_t
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/** Convert ascii representation to unative_t
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 *
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 *
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 * Supports 0x for hexa & 0 for octal notation.
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 * Supports 0x for hexa & 0 for octal notation.
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 * Does not check for overflows, does not support negative numbers
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 * Does not check for overflows, does not support negative numbers
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 *
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 *