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- <html>
- <head>
- <title>__vprintf</title>
- <body bgcolor=#ffffff>
- <h2 align=center>__vprintf</h2>
- <h4 align=center>OS/161 Reference Manual</h4>
- <h3>Name</h3>
- __vprintf - printf backend
- <h3>Library</h3>
- Standard C Library (libc, -lc)
- <h3>Synopsis</h3>
- #include <unistd.h><br>
- <br>
- int<br>
- __vprintf(void (*<em>func</em>)(void *<em>clientdata</em>,
- const char *<em>str</em>,
- size_t <em>len</em>),
- void *<em>clientdata</em>, const char *<em>format</em>,
- va_list)
- <h3>Description</h3>
- In OS/161, __vprintf is the back-end engine for
- <A HREF=printf.html>printf</A> and printf-like functions.
- Note that it is not portable - application code should use
- <A HREF=snprintf.html>snprintf or vsnprintf</A> when implementing
- their own printf-like functions. This documentation is provided for
- use when extending OS/161 itself.
- <p>
- The <em>format</em> and subsequent arguments are treated as described
- under <A HREF=printf.html>printf</A>.
- <p>
- The <em>func</em> argument is called to print text generated by the
- formatting process. The <em>clientdata</em> argument is passed
- straight through __vprintf to <em>func</em>. The <em>str</em> argument
- to func points to some text that is to be printed; the <em>len</em>
- argument is the length of that string, which should not be assumed to
- be null-terminated.
- <p>
- The strings passed to <em>func</em> may be small; if printing is
- expensive buffering is probably indicated.
- <h3>Return Values</h3>
- __vprintf returns the number of characters printed.
- </body>
- </html>
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