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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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/** 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, snprintf() has 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 the 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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        str[0] = 0;
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        str[0] = 0;
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    /* vsnprintf_write ensures that str will be terminated by zero. */
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    /* vsnprintf_write ensures that str will be terminated by zero. */
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    return printf_core(fmt, &ps, ap);
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    return printf_core(fmt, &ps, ap);
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}
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}
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