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135 lines
6.4 KiB
HTML
135 lines
6.4 KiB
HTML
4 years ago
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<title>vfprintf (The Red Hat newlib C Library)</title>
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<a name="vfprintf"></a>
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<div class="header">
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<p>
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Next: <a href="vfscanf.html#vfscanf" accesskey="n" rel="next">vfscanf</a>, Previous: <a href="ungetwc.html#ungetwc" accesskey="p" rel="prev">ungetwc</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="vfprintf_002c-vprintf_002c-vsprintf_002c-vsnprintf_002c-vasprintf_002c-vasnprintf_002d_002d_002dformat-argument-list"></a>
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<h3 class="section">4.70 <code>vfprintf</code>, <code>vprintf</code>, <code>vsprintf</code>, <code>vsnprintf</code>, <code>vasprintf</code>, <code>vasnprintf</code>—format argument list</h3>
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<a name="index-vfprintf"></a>
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<a name="index-_005fvfprintf_005fr"></a>
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<a name="index-vprintf"></a>
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<a name="index-_005fvprintf_005fr"></a>
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<a name="index-vsprintf"></a>
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<a name="index-_005fvsprintf_005fr"></a>
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<a name="index-vsnprintf"></a>
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<a name="index-_005fvsnprintf_005fr"></a>
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<a name="index-vasprintf"></a>
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<a name="index-_005fvasprintf_005fr"></a>
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<a name="index-vasnprintf"></a>
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<a name="index-_005fvasnprintf_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdio.h>
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#include <stdarg.h>
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int vprintf(const char *<var>fmt</var>, va_list <var>list</var>);
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int vfprintf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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int vsprintf(char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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int vsnprintf(char *<var>str</var>, size_t <var>size</var>, const char *<var>fmt</var>,
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va_list <var>list</var>);
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int vasprintf(char **<var>strp</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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char *vasnprintf(char *<var>str</var>, size_t *<var>size</var>, const char *<var>fmt</var>,
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va_list <var>list</var>);
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int _vprintf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>,
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va_list <var>list</var>);
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int _vfprintf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>,
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const char *<var>fmt</var>, va_list <var>list</var>);
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int _vsprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>,
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const char *<var>fmt</var>, va_list <var>list</var>);
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int _vasprintf_r(struct _reent *<var>reent</var>, char **<var>str</var>,
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const char *<var>fmt</var>, va_list <var>list</var>);
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int _vsnprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>,
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size_t <var>size</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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char *_vasnprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>,
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size_t *<var>size</var>, const char *<var>fmt</var>, va_list <var>list</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>vprintf</code>, <code>vfprintf</code>, <code>vasprintf</code>, <code>vsprintf</code>, <code>vsnprintf</code>,
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and <code>vasnprintf</code> are (respectively) variants of <code>printf</code>,
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<code>fprintf</code>, <code>asprintf</code>, <code>sprintf</code>, <code>snprintf</code>, and
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<code>asnprintf</code>. They differ only in allowing their caller to pass the
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variable argument list as a <code>va_list</code> object (initialized by
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<code>va_start</code>) rather than directly accepting a variable number of
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arguments. The caller is responsible for calling <code>va_end</code>.
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</p>
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<p><code>_vprintf_r</code>, <code>_vfprintf_r</code>, <code>_vasprintf_r</code>, <code>_vsprintf_r</code>,
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<code>_vsnprintf_r</code>, and <code>_vasnprintf_r</code> are reentrant versions of the
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above.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The return values are consistent with the corresponding functions.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>vprintf</code>, <code>vfprintf</code>, <code>vsprintf</code>, and
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<code>vsnprintf</code>. The remaining functions are newlib extensions.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<br>
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<hr>
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<div class="header">
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<p>
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Next: <a href="vfscanf.html#vfscanf" accesskey="n" rel="next">vfscanf</a>, Previous: <a href="ungetwc.html#ungetwc" accesskey="p" rel="prev">ungetwc</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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