Library /sys$common/syshlp/helplib.hlb  —  CRTL  fputc  Description
    The fputc function writes a single character to the specified
    file and returns the character.

    Compiling with the __UNIX_PUTC macro defined enables an
    optimization that uses a faster, inlined version of this
    function.

    See also the fputc_unlocked function and the putc macro.
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