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    printf - print a formatted output line to the standard output.

    printf(formatstring [,value [,values] ] );

    Format the output in accordance with specifications in the format

    formatString - a C-language-like NULL-terminated format string,
                   with the following supported % options:


        $     - must follow the arg_pos value, if specified
      flags   - only one allowed. '-' specifies left justification.
      width   - field width. If the first character is a '0', the
                field is padded with leading 0s.
        .     - must precede the field width value, if specified
      limit   - maximum number of characters to output from a string.
                (only valid for %s or %b).
      length  - size of input data defaults to word (16-bit) for types c,
                d, u and x, 'l' changes this to long (32-bit).
      type    - supported types are:
                      b - BSTR, data is 32-bit BPTR to byte count followed
                          by a byte string. A NULL BPTR is treated as an
                          empty string. (V36)
                      d - signed decimal
                      u - unsigned decimal
                      x - hexadecimal with hex digits in uppercase
                      X - hexadecimal with hex digits in lowercase
                      s - string, a 32-bit pointer to a NULL-terminated
                          byte string. A NULL pointer is treated
                          as an empty string.
                      c - character

    value(s) - numeric variables or addresses of null-terminated strings
               to be added to the format information.

    The global "_stdout" must be defined, and contain a pointer to
    a legal AmigaDOS file handle. Using the standard Amiga startup
    module sets this up. In other cases you will need to define
    stdout, and assign it to some reasonable value (like what the
    dos.library/Output() call returns). This code would set it up:

            ULONG stdout;

    This function will crash if the resulting stream after
    parameter substitution is longer than 140 bytes.

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