This chapter comprises functions to manage files or other input/output streams. Among these functions are subroutines to generate or scan strings according to specifications from a format string.
The underlying facilities for input and output depend on the host system, but these functions provide a uniform interface.
The corresponding declarations are in `stdio.h'.
The reentrant versions of these functions use macros
_stdin_r(reent) _stdout_r(reent) _stderr_r(reent)
instead of the globals
stderr. The argument <[reent]> is a pointer to a reentrancy
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