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 * @param data structure with destination string, counter of used space and total string size.
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 * @param data structure with destination string, counter of used space and total string size.
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 * @return number of characters to print (not characters really printed!)
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 * @return number of characters to print (not characters really printed!)
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 */
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 */
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int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data)
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int vsnprintf_write(const char *str, size_t count, struct vsnprintf_data *data)
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{
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{
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    size_t i,j;
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    size_t i;
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    i = data->size - data->len;
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    i = data->size - data->len;
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    j = count;
 - 
 
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    if (i > 0) {
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    if ((count == 0) || (i == 0)) {
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        if (i <= j) {
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        return 0;
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    }
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            if (i == 1) {
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    if (i == 1) {
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                /* We have only one free byte left in buffer => write there trailing zero */
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        /* We have only one free byte left in buffer => write there trailing zero */
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                data->string[data->size - 1] = 0;
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        data->string[data->size - 1] = 0;
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                data->len = data->size;
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        data->len = data->size;
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            } else {
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        return 1;
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    }
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    if (i <= count) {
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                /* We have not enought space for whole string with the trailing zero => print only a part of string */
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        /* We have not enought space for whole string with the trailing zero => print only a part of string */
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                memcpy((void *)(data->string + data->len), (void *)str, i - 1);
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            memcpy((void *)(data->string + data->len), (void *)str, i - 1);
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                data->string[data->size - 1] = 0;
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            data->string[data->size - 1] = 0;
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                data->len = data->size;
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            data->len = data->size;
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            return i;
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            }
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    }
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        } else {
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            /* Buffer is big enought to print whole string */
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    /* Buffer is big enought to print whole string */
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            memcpy((void *)(data->string + data->len), (void *)str, j);
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    memcpy((void *)(data->string + data->len), (void *)str, count);
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            data->len += j;
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    data->len += count;
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            /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */
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    /* Put trailing zero at end, but not count it into data->len so it could be rewritten next time */
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            data->string[data->len] = 0;
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    data->string[data->len] = 0;
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        }
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    }
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    return count;  
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    return count;  
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}
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}
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int vsnprintf(char *str, size_t size, const char *fmt, va_list ap)
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int vsnprintf(char *str, size_t size, const char *fmt, va_list ap)