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| <h4 class="subsection">12.14.8 Formatted Input Functions</h4> |
| |
| <p>Here are the descriptions of the functions for performing formatted |
| input. |
| Prototypes for these functions are in the header file <samp><span class="file">stdio.h</span></samp>. |
| <a name="index-stdio_002eh-1082"></a> |
| <!-- stdio.h --> |
| <!-- ISO --> |
| |
| <div class="defun"> |
| — Function: int <b>scanf</b> (<var>const char *template, <small class="dots">...</small></var>)<var><a name="index-scanf-1083"></a></var><br> |
| <blockquote><p>The <code>scanf</code> function reads formatted input from the stream |
| <code>stdin</code> under the control of the template string <var>template</var>. |
| The optional arguments are pointers to the places which receive the |
| resulting values. |
| |
| <p>The return value is normally the number of successful assignments. If |
| an end-of-file condition is detected before any matches are performed, |
| including matches against whitespace and literal characters in the |
| template, then <code>EOF</code> is returned. |
| </p></blockquote></div> |
| |
| <!-- wchar.h --> |
| <!-- ISO --> |
| <div class="defun"> |
| — Function: int <b>wscanf</b> (<var>const wchar_t *template, <small class="dots">...</small></var>)<var><a name="index-wscanf-1084"></a></var><br> |
| <blockquote><p>The <code>wscanf</code> function reads formatted input from the stream |
| <code>stdin</code> under the control of the template string <var>template</var>. |
| The optional arguments are pointers to the places which receive the |
| resulting values. |
| |
| <p>The return value is normally the number of successful assignments. If |
| an end-of-file condition is detected before any matches are performed, |
| including matches against whitespace and literal characters in the |
| template, then <code>WEOF</code> is returned. |
| </p></blockquote></div> |
| |
| <!-- stdio.h --> |
| <!-- ISO --> |
| <div class="defun"> |
| — Function: int <b>fscanf</b> (<var>FILE *stream, const char *template, <small class="dots">...</small></var>)<var><a name="index-fscanf-1085"></a></var><br> |
| <blockquote><p>This function is just like <code>scanf</code>, except that the input is read |
| from the stream <var>stream</var> instead of <code>stdin</code>. |
| </p></blockquote></div> |
| |
| <!-- wchar.h --> |
| <!-- ISO --> |
| <div class="defun"> |
| — Function: int <b>fwscanf</b> (<var>FILE *stream, const wchar_t *template, <small class="dots">...</small></var>)<var><a name="index-fwscanf-1086"></a></var><br> |
| <blockquote><p>This function is just like <code>wscanf</code>, except that the input is read |
| from the stream <var>stream</var> instead of <code>stdin</code>. |
| </p></blockquote></div> |
| |
| <!-- stdio.h --> |
| <!-- ISO --> |
| <div class="defun"> |
| — Function: int <b>sscanf</b> (<var>const char *s, const char *template, <small class="dots">...</small></var>)<var><a name="index-sscanf-1087"></a></var><br> |
| <blockquote><p>This is like <code>scanf</code>, except that the characters are taken from the |
| null-terminated string <var>s</var> instead of from a stream. Reaching the |
| end of the string is treated as an end-of-file condition. |
| |
| <p>The behavior of this function is undefined if copying takes place |
| between objects that overlap—for example, if <var>s</var> is also given |
| as an argument to receive a string read under control of the ‘<samp><span class="samp">%s</span></samp>’, |
| ‘<samp><span class="samp">%S</span></samp>’, or ‘<samp><span class="samp">%[</span></samp>’ conversion. |
| </p></blockquote></div> |
| |
| <!-- wchar.h --> |
| <!-- ISO --> |
| <div class="defun"> |
| — Function: int <b>swscanf</b> (<var>const wchar_t *ws, const char *template, <small class="dots">...</small></var>)<var><a name="index-swscanf-1088"></a></var><br> |
| <blockquote><p>This is like <code>wscanf</code>, except that the characters are taken from the |
| null-terminated string <var>ws</var> instead of from a stream. Reaching the |
| end of the string is treated as an end-of-file condition. |
| |
| <p>The behavior of this function is undefined if copying takes place |
| between objects that overlap—for example, if <var>ws</var> is also given as |
| an argument to receive a string read under control of the ‘<samp><span class="samp">%s</span></samp>’, |
| ‘<samp><span class="samp">%S</span></samp>’, or ‘<samp><span class="samp">%[</span></samp>’ conversion. |
| </p></blockquote></div> |
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