Writes formatted data into a buffer, using variable arguments.
int uvsprintf(char *
buf, const char *
format, va_list args);
This is like usprintf(), but you pass the variable argument list directly,
instead of the arguments themselves. You can use this function to implement
printf like functions, also called variadic functions. You should try to
avoid this function because it is very easy to overflow the destination
buffer. Use uvszprintf instead.
Returns the number of characters written, not including the terminating
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