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| <h3 class="section">4.37 <code>getline</code>—read a line from a file</h3> |
| |
| <p><a name="index-getline-224"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| ssize_t getline(char **<var>bufptr</var>, size_t *<var>n</var>, FILE *<var>fp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>getline</code> reads a file <var>fp</var> up to and possibly including the |
| newline character. The line is read into a buffer pointed to |
| by <var>bufptr</var> and designated with size *<var>n</var>. If the buffer is |
| not large enough, it will be dynamically grown by <code>getdelim</code>. |
| As the buffer is grown, the pointer to the size <var>n</var> will be |
| updated. |
| |
| <p><code>getline</code> is equivalent to getdelim(bufptr, n, '\n', fp); |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>getline</code> returns <code>-1</code> if no characters were successfully read, |
| otherwise, it returns the number of bytes successfully read. |
| at end of file, the result is nonzero. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>getline</code> is a glibc extension. |
| |
| <p>No supporting OS subroutines are directly required. |
| |
| <p><br> |
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