Question

I want to get from a string a boolean value. the string looks like that:

char *s = "value=TRUE";

the value could be TRUE, FALSE, true or false

I m wondering if there is a format specifier to get directly the boolean value from the string? I do not need to pass throught a string and then deduce the boolean value.

I m looking for something like that

bool x;
sscanf(s,"value=%b",&x);

the question is. Is it possible to get the bool value directly with sscanf and with a format specifier?

If not, Are there a quick method for that?

Edit:

Based on the response there is no direct format specifier.

Here a after a quick method to get the boolean value directelly

char b[8];
if ( sscanf(s,"value=%[TtRrUuEe]",b))
   return TRUE;
else
   return FALSE;

I know that the above method is limited. How ameliorate it?

Note: the default value is False in case the value string contains garbage

Answer 1

the short answer is “no”.

You could get the source for GNU C-library and change that for yourself.

f.e.

mysscanf(char *buf, char *format, ...)
{
  // scan the format for %b and change it to %s and 
  // redirect the equivalent paramter-variable
  // to a char * buffer
  // then analyse the buffer and write the boolean value into the original parameter
}