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