VARIABLE

ANALYSIS:
=========
In the function my_b_vprintf() which is used for logging
in MySQL, there is an unintended usage of 'precision'
variable.

my_b_printf() which is wrapper for my_b_vprintf() is a
simple version of printf().
Generally in printf() statements, we use an asterisk (*) to
denote the width specifier/precision instead of hard coding
it in the format string. The value for '*' is passed as an
additional integer value argument to printf(), preceding
the argument that has to be formatted.

To achieve the required formatting, we use two variables
which are defined below.

- minimum_width (currently implemented for %d and %u):
  The minimum number of characters to be printed. If the
  value to be printed is shorter than this number, the
  result is padded with blank spaces.

- precision (currently implemented for %b, binary buffer):
  used to print exactly <precision> bytes from the argument
  without stopping at '\0'.

In the current implementation, 'precision' was used for
processing '*' which should ideally be used only for
processing '.*'. This might result in data loss.

FIX:
====
We are now using the variable 'precision' for processing
of '.*' and 'minimum_width' for processing of '*'.