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| <h3 class="section">8.85 <code>FGETC</code> — Read a single character in stream mode</h3> |
| |
| <p><a name="index-FGETC-637"></a><a name="index-read-character_002c-stream-mode-638"></a><a name="index-stream-mode_002c-read-character-639"></a><a name="index-file-operation_002c-read-character-640"></a> |
| <dl> |
| <dt><em>Description</em>:<dd>Read a single character in stream mode by bypassing normal formatted output. |
| Stream I/O should not be mixed with normal record-oriented (formatted or |
| unformatted) I/O on the same unit; the results are unpredictable. |
| |
| <p>This intrinsic is provided in both subroutine and function forms; however, |
| only one form can be used in any given program unit. |
| |
| <p>Note that the <code>FGET</code> intrinsic is provided for backwards compatibility |
| with <samp><span class="command">g77</span></samp>. GNU Fortran provides the Fortran 2003 Stream facility. |
| Programmers should consider the use of new stream IO feature in new code |
| for future portability. See also <a href="Fortran-2003-status.html#Fortran-2003-status">Fortran 2003 status</a>. |
| |
| <br><dt><em>Standard</em>:<dd>GNU extension |
| |
| <br><dt><em>Class</em>:<dd>Subroutine, function |
| |
| <br><dt><em>Syntax</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="80%"><code>CALL FGETC(UNIT, C [, STATUS])</code> |
| <br></td></tr><tr align="left"><td valign="top" width="80%"><code>STATUS = FGETC(UNIT, C)</code> |
| <br></td></tr></table> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>UNIT</var> </td><td valign="top" width="70%">The type shall be <code>INTEGER</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>C</var> </td><td valign="top" width="70%">The type shall be <code>CHARACTER</code> and of default |
| kind. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>STATUS</var> </td><td valign="top" width="70%">(Optional) status flag of type <code>INTEGER</code>. |
| Returns 0 on success, -1 on end-of-file and a system specific positive |
| error code otherwise. |
| <br></td></tr></table> |
| |
| <br><dt><em>Example</em>:<dd> |
| <pre class="smallexample"> PROGRAM test_fgetc |
| INTEGER :: fd = 42, status |
| CHARACTER :: c |
| |
| OPEN(UNIT=fd, FILE="/etc/passwd", ACTION="READ", STATUS = "OLD") |
| DO |
| CALL fgetc(fd, c, status) |
| IF (status /= 0) EXIT |
| call fput(c) |
| END DO |
| CLOSE(UNIT=fd) |
| END PROGRAM |
| </pre> |
| <br><dt><em>See also</em>:<dd><a href="FGET.html#FGET">FGET</a>, <a href="FPUT.html#FPUT">FPUT</a>, <a href="FPUTC.html#FPUTC">FPUTC</a> |
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