CAVR-4
Part 1. Using the compiler
The DLIB runtime environment
69
Configuration symbols for printf and scanf
When you set up your application project, you typically need to consider what printf
and scanf formatting capabilities your application requires, see Choosing formatters
for printf and scanf, page 59.
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:
Printf configuration symbols Includes support for
_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
Table 19: Descriptions of printf configuration symbols
Scanf configuration symbols Includes support for
_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 ([*])
Table 20: Descriptions of scanf configuration symbols
