Inputs data from the specified storage area and converts it according to a format.
long vsscanf(const char *restrict s, const char *restrict control, va_list arg);
s Storage area containing data to be input
control Pointer to string indicating format
Normal: Number of data items successfully input and converted
Abnormal: nput data ends before input data conversion is performed: EOF
The vsscanf function is equivalent to sscanf with arg specified instead of the variable parameters.
Initialize arg through the va_start macro before calling the vsscanf function.