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| <h3 class="section">4.69 <code>vfscanf</code>, <code>vscanf</code>, <code>vsscanf</code>—format argument list</h3> |
| |
| <p><a name="index-vfscanf-337"></a><a name="index-g_t_005fvfscanf_005fr-338"></a><a name="index-vscanf-339"></a><a name="index-g_t_005fvscanf_005fr-340"></a><a name="index-vsscanf-341"></a><a name="index-g_t_005fvsscanf_005fr-342"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| #include <stdarg.h> |
| int vscanf(const char *<var>fmt</var>, va_list <var>list</var>); |
| int vfscanf(FILE *<var>fp</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| int vsscanf(const char *<var>str</var>, const char *<var>fmt</var>, va_list <var>list</var>); |
| |
| int _vscanf_r(struct _reent *<var>reent</var>, const char *<var>fmt</var>, |
| va_list <var>list</var>); |
| int _vfscanf_r(struct _reent *<var>reent</var>, FILE *<var>fp</var>, const char *<var>fmt</var>, |
| va_list <var>list</var>); |
| int _vsscanf_r(struct _reent *<var>reent</var>, const char *<var>str</var>, |
| const char *<var>fmt</var>, va_list <var>list</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>vscanf</code>, <code>vfscanf</code>, and <code>vsscanf</code> are (respectively) variants |
| of <code>scanf</code>, <code>fscanf</code>, and <code>sscanf</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. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The return values are consistent with the corresponding functions: |
| <code>vscanf</code> returns the number of input fields successfully scanned, |
| converted, and stored; the return value does not include scanned |
| fields which were not stored. |
| |
| <p>If <code>vscanf</code> attempts to read at end-of-file, the return value |
| is <code>EOF</code>. |
| |
| <p>If no fields were stored, the return value is <code>0</code>. |
| |
| <p>The routines <code>_vscanf_r</code>, <code>_vfscanf_f</code>, and <code>_vsscanf_r</code> are |
| reentrant versions which take an additional first parameter which points to the |
| reentrancy structure. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| These are GNU extensions. |
| |
| <p>Supporting OS subroutines required: |
| |
| <p><br> |
| |
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