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    size_t size; /* total space for string */
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    size_t size; /* total space for string */
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    size_t len; /* count of currently used characters */
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    size_t len; /* count of currently used characters */
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    char *string; /* destination string */
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    char *string; /* destination string */
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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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/** Write string to given buffer.
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/** Write string to given buffer.
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 * Write at most data->size characters including trailing zero. According to C99 has snprintf to return number
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 * Write at most data->size characters including trailing zero. According to C99 has snprintf to return number
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 * of characters that would have been written if enough space had been available. Hence the return value is not
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 * of characters that would have been written if enough space had been available. Hence the return value is not
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 * number of really printed characters but size of input string. Number of really used characters
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 * number of really printed characters but size of input string. Number of really used characters
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 * is stored in data->len.
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 * is stored in data->len.
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 * @param str source string to print
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 * @param str source string to print
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 * @param count size of source string
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 * @param count size of source string
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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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static 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;
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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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    if (i == 0) {
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    if (i == 0) {
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 * \see For more details about format string see printf_core.
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 * \see For more details about format string see printf_core.
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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)
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{
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{
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    struct vsnprintf_data data = {size, 0, str};
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    struct vsnprintf_data data = {size, 0, str};
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    struct printf_spec ps = {(int(*)(void *, size_t, void *))vsnprintf_write, &data};
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    struct printf_spec ps = {(int(*)(void *, size_t, void *)) vsnprintf_write, &data};
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    /* Print 0 at end of string - fix the case that nothing will be printed */
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    /* Print 0 at end of string - fix the case that nothing will be printed */
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    if (size > 0)
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    if (size > 0)
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        str[0] = 0;
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        str[0] = 0;
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