Ddpi_Format specifiers

The libddpi design recognizes that output data will include the names and values of variables, types and functions. The Ddpi_Format specifiers handle this type of information.

For example:

The %<NV> specifier indicates that a variable name should be sent to output.
The %<I> specifier indicates that an indentation should be added, based on the nested position of the given data.

Composite-type data can be extracted for an entire structure or for a single member. For example, if theddpi_formatter operation specifies %<Nd> , the function will return both the tag name and the variable name of the given composite variable.

Specifiers that identify output data

%<NT>: %<NT> causes the function to return the type of the variable.
%<NV>: %<NV> causes the function to return the name of the variable.
%<Nd>: %<Nd> causes the function to return both the type and name of the variable.
%<ND>: %<ND> behaves the same as %<Nd>, except that the composite types are expanded. For example, if a structure is used, then the function will also return the type and name of the members.
%<V>: %<V> causes the function to return the value of the variable.

Specifiers that format output data

%<Ix>

Causes the function to create an indentation, where x is the depth in the current nested level of a composite type. For example, %<I3> will cause an indentation of three spaces per level. For a member of a structure inside a structure, the indentation would be six spaces.

%<S>

Causes the function to print a string that is enclosed in double quotes, and replace non-printable characters with dots.

%<C>

Causes the function to print a character enclosed in single quotes. It replaces control characters, based on the input character set (EBCDIC or ASCII), as shown in Table 1. It replaces other non-printing characters with dots.

Table 1. Control character replacements for ASCII and EBCDIC
EBCDIC input character	ASCII input character	Replacement string
\x15	\xa	\n
\x5	\x9	\t
\xb	\xb	\v
\x16	\x8	\b
\xd	\xd	\r
\xc	\xc	\f
\x2f	\x7	\a

user defined

The format specifier also accepts the general syntax %<fmt_name> , where fmt_name is a symbolic name representing a format string. fmt_name must be defined by a previous call to the ddpi_format_set_type_format operation. Substitution is done recursively until all items with the %<...> syntax are replaced.

Example: If you want to replace all occurrences of %<UINT> in the given format string with %12.12u, use the following statement:

ddpi_format_set_type_format(info, "UINT", "%12.12u");