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To customize the formatting capabilities, you need to set up a library project, see
Building and using a customized library, page 51. Define the configuration symbols
according to your application requirements
The library contains a large number of powerful functions for file I/O operations. If you
use any of these functions you need to customize them to suit your hardware. In order
to simplify adaptation to specific hardware, all I/O functions call a small set of primitive
functions, each designed to accomplish one particular task; for example, the __open
opens a file, and __write outputs a number of characters.
Note that file I/O capability in the library is only supported by libraries with full library
configuration, see Library configurations, page 43. In other words, file I/O is supported
when the configuration symbol __DLIB_FILE_DESCRIPTOR is enabled. If not enabled,
functions taking a FILE * argument cannot be used.
Template code for the following I/O files are included in the product:
The primitive functions identify I/O streams, such as an open file, with a file descriptor
that is a unique integer. The I/O streams normally associated with stdin, stdout, and
stderr have the file descriptors 0, 1, and 2, respectively.
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