Atmel CAVR-4 Manual De Usuario

CAVR-4

Part 1. Using the compiler

When you set up your application project, you typically need to consider what 

printf

 

and 

scanf

 formatting capabilities your application requires, see Choosing formatters 

If the provided formatters do not meet your requirements, you can customize the full 
formatters. However, that means you need to rebuild the runtime library.

The default behavior of the 

printf

 and 

scanf

 formatters are defined by configuration 

symbols in the file 

DLIB_Defaults.h

.

The following configuration symbols determine what capabilities the function 

printf

 

should have:

When you build a library, the following configurations determine what capabilities the 
function 

scanf

 should have:

_DLIB_PRINTF_MULTIBYTE

Multibyte characters

_DLIB_PRINTF_LONG_LONG

Long long (ll qualifier)

_DLIB_PRINTF_SPECIFIER_FLOAT

Floating-point numbers

_DLIB_PRINTF_SPECIFIER_A

Hexadecimal floats

_DLIB_PRINTF_SPECIFIER_N

Output count (%n)

_DLIB_PRINTF_QUALIFIERS

Qualifiers h, l, L, v, t, and z

_DLIB_PRINTF_FLAGS

Flags -, +, #, and 0

_DLIB_PRINTF_WIDTH_AND_PRECISION

Width and precision

_DLIB_PRINTF_CHAR_BY_CHAR

Output char by char or buffered

_DLIB_SCANF_MULTIBYTE

Multibyte characters

_DLIB_SCANF_LONG_LONG

Long long (ll qualifier)

_DLIB_SCANF_SPECIFIER_FLOAT

Floating-point numbers

_DLIB_SCANF_SPECIFIER_N

Output count (%n)

_DLIB_SCANF_QUALIFIERS

Qualifiers h, j, l, t, z, and L

_DLIB_SCANF_SCANSET

Scanset ([*])

_DLIB_SCANF_WIDTH

Width

_DLIB_SCANF_ASSIGNMENT_SUPPRESSING

Assignment suppressing ([*])