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| <h3 class="section">4.68 <code>vfprintf</code>, <code>vprintf</code>, <code>vsprintf</code>, <code>vsnprintf</code>, <code>vasprintf</code>, <code>vasnprintf</code>—format argument list</h3> |
| |
| <p><a name="index-vfprintf-325"></a><a name="index-g_t_005fvfprintf_005fr-326"></a><a name="index-vprintf-327"></a><a name="index-g_t_005fvprintf_005fr-328"></a><a name="index-vsprintf-329"></a><a name="index-g_t_005fvsprintf_005fr-330"></a><a name="index-vsnprintf-331"></a><a name="index-g_t_005fvsnprintf_005fr-332"></a><a name="index-vasprintf-333"></a><a name="index-g_t_005fvasprintf_005fr-334"></a><a name="index-vasnprintf-335"></a><a name="index-g_t_005fvasnprintf_005fr-336"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| #include <stdarg.h> |
| int vprintf(const char *<var>fmt</var>, va_list <var>list</var>); |
| int vfprintf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| int vsprintf(char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| int vsnprintf(char *<var>str</var>, size_t <var>size</var>, const char *<var>fmt</var>, |
| va_list <var>list</var>); |
| int vasprintf(char **<var>strp</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| char *vasnprintf(char *<var>str</var>, size_t *<var>size</var>, const char *<var>fmt</var>, |
| va_list <var>list</var>); |
| |
| int _vprintf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>, |
| va_list <var>list</var>); |
| int _vfprintf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, |
| const char *<var>fmt</var>, va_list <var>list</var>); |
| int _vsprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>, |
| const char *<var>fmt</var>, va_list <var>list</var>); |
| int _vasprintf_r(struct _reent *<var>reent</var>, char **<var>str</var>, |
| const char *<var>fmt</var>, va_list <var>list</var>); |
| int _vsnprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>, |
| size_t <var>size</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| char *_vasnprintf_r(struct _reent *<var>reent</var>, char *<var>str</var>, |
| size_t *<var>size</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>vprintf</code>, <code>vfprintf</code>, <code>vasprintf</code>, <code>vsprintf</code>, <code>vsnprintf</code>, |
| and <code>vasnprintf</code> are (respectively) variants of <code>printf</code>, |
| <code>fprintf</code>, <code>asprintf</code>, <code>sprintf</code>, <code>snprintf</code>, and |
| <code>asnprintf</code>. They differ only in allowing their caller to pass the |
| variable argument list as a <code>va_list</code> object (initialized by |
| <code>va_start</code>) rather than directly accepting a variable number of |
| arguments. The caller is responsible for calling <code>va_end</code>. |
| |
| <p><code>_vprintf_r</code>, <code>_vfprintf_r</code>, <code>_vasprintf_r</code>, <code>_vsprintf_r</code>, |
| <code>_vsnprintf_r</code>, and <code>_vasnprintf_r</code> are reentrant versions of the |
| above. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The return values are consistent with the corresponding functions. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>vprintf</code>, <code>vfprintf</code>, <code>vsprintf</code>, and |
| <code>vsnprintf</code>. The remaining functions are newlib extensions. |
| |
| <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>, |
| <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. |
| |
| <p><br> |
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