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| <h5 class="subsubsection">17.4.9.1 Characters for Input Editing</h5> |
| |
| <p>These special characters are active only in canonical input mode. |
| See <a href="Canonical-or-Not.html#Canonical-or-Not">Canonical or Not</a>. |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VEOF</b><var><a name="index-VEOF-1957"></a></var><br> |
| <blockquote><p><a name="index-EOF-character-1958"></a>This is the subscript for the EOF character in the special control |
| character array. <var>termios</var><code>.c_cc[VEOF]</code> holds the character |
| itself. |
| |
| <p>The EOF character is recognized only in canonical input mode. It acts |
| as a line terminator in the same way as a newline character, but if the |
| EOF character is typed at the beginning of a line it causes <code>read</code> |
| to return a byte count of zero, indicating end-of-file. The EOF |
| character itself is discarded. |
| |
| <p>Usually, the EOF character is <kbd>C-d</kbd>. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VEOL</b><var><a name="index-VEOL-1959"></a></var><br> |
| <blockquote><p><a name="index-EOL-character-1960"></a>This is the subscript for the EOL character in the special control |
| character array. <var>termios</var><code>.c_cc[VEOL]</code> holds the character |
| itself. |
| |
| <p>The EOL character is recognized only in canonical input mode. It acts |
| as a line terminator, just like a newline character. The EOL character |
| is not discarded; it is read as the last character in the input line. |
| |
| <!-- !!! example: this is set to ESC by 4.3 csh with "set filec" so it can --> |
| <!-- complete partial lines without using cbreak or raw mode. --> |
| <p>You don't need to use the EOL character to make <RET> end a line. |
| Just set the ICRNL flag. In fact, this is the default state of |
| affairs. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>VEOL2</b><var><a name="index-VEOL2-1961"></a></var><br> |
| <blockquote><p><a name="index-EOL2-character-1962"></a>This is the subscript for the EOL2 character in the special control |
| character array. <var>termios</var><code>.c_cc[VEOL2]</code> holds the character |
| itself. |
| |
| <p>The EOL2 character works just like the EOL character (see above), but it |
| can be a different character. Thus, you can specify two characters to |
| terminate an input line, by setting EOL to one of them and EOL2 to the |
| other. |
| |
| <p>The EOL2 character is a BSD extension; it exists only on BSD systems |
| and the GNU system. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VERASE</b><var><a name="index-VERASE-1963"></a></var><br> |
| <blockquote><p><a name="index-ERASE-character-1964"></a>This is the subscript for the ERASE character in the special control |
| character array. <var>termios</var><code>.c_cc[VERASE]</code> holds the |
| character itself. |
| |
| <p>The ERASE character is recognized only in canonical input mode. When |
| the user types the erase character, the previous character typed is |
| discarded. (If the terminal generates multibyte character sequences, |
| this may cause more than one byte of input to be discarded.) This |
| cannot be used to erase past the beginning of the current line of text. |
| The ERASE character itself is discarded. |
| <!-- !!! mention ECHOE here --> |
| |
| <p>Usually, the ERASE character is <DEL>. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>VWERASE</b><var><a name="index-VWERASE-1965"></a></var><br> |
| <blockquote><p><a name="index-WERASE-character-1966"></a>This is the subscript for the WERASE character in the special control |
| character array. <var>termios</var><code>.c_cc[VWERASE]</code> holds the character |
| itself. |
| |
| <p>The WERASE character is recognized only in canonical mode. It erases an |
| entire word of prior input, and any whitespace after it; whitespace |
| characters before the word are not erased. |
| |
| <p>The definition of a “word” depends on the setting of the |
| <code>ALTWERASE</code> mode; see <a href="Local-Modes.html#Local-Modes">Local Modes</a>. |
| |
| <p>If the <code>ALTWERASE</code> mode is not set, a word is defined as a sequence |
| of any characters except space or tab. |
| |
| <p>If the <code>ALTWERASE</code> mode is set, a word is defined as a sequence of |
| characters containing only letters, numbers, and underscores, optionally |
| followed by one character that is not a letter, number, or underscore. |
| |
| <p>The WERASE character is usually <kbd>C-w</kbd>. |
| |
| <p>This is a BSD extension. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Macro: int <b>VKILL</b><var><a name="index-VKILL-1967"></a></var><br> |
| <blockquote><p><a name="index-KILL-character-1968"></a>This is the subscript for the KILL character in the special control |
| character array. <var>termios</var><code>.c_cc[VKILL]</code> holds the character |
| itself. |
| |
| <p>The KILL character is recognized only in canonical input mode. When the |
| user types the kill character, the entire contents of the current line |
| of input are discarded. The kill character itself is discarded too. |
| |
| <p>The KILL character is usually <kbd>C-u</kbd>. |
| </p></blockquote></div> |
| |
| <!-- termios.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>VREPRINT</b><var><a name="index-VREPRINT-1969"></a></var><br> |
| <blockquote><p><a name="index-REPRINT-character-1970"></a>This is the subscript for the REPRINT character in the special control |
| character array. <var>termios</var><code>.c_cc[VREPRINT]</code> holds the character |
| itself. |
| |
| <p>The REPRINT character is recognized only in canonical mode. It reprints |
| the current input line. If some asynchronous output has come while you |
| are typing, this lets you see the line you are typing clearly again. |
| |
| <p>The REPRINT character is usually <kbd>C-r</kbd>. |
| |
| <p>This is a BSD extension. |
| </p></blockquote></div> |
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