ascii.h

Many C samples. It is a good sample for students to learn C language.

/*  File   : strings.d/ascii.h
    Author : Richard A. O'Keefe
    Updated: 28 April 1984
    Purpose: Define Ascii mnemonics.

    This file defines the ASCII control characters.  Note that these
    names refer to their use in communication; it is an ERROR to use
    these names to talk about keyboard commands.  For example, DO NOT
    use EOT when you mean "end of file", as many people prefer ^Z (if
    the Ascii code were taken seriously, EOT would log you off and
    hang up the line as well).  Similarly, DO NOT use DEL when you
    mean "interrupt", many people prefer ^C.  When writing a screen
    editor, you should speak of tocntrl('C') rather than ETX (see the
    header file "ctypes.h").
*/

#define NUL	'\000'	/* null character */
#define SOH	'\001'	/* Start Of Heading, start of message */
#define STX	'\002'	/* Start Of Text, end of address */
#define	ETX	'\003'	/* End of TeXt, end of message */
#define EOT	'\004'	/* End Of Transmission */
#define	ENQ	'\005'	/* ENQuiry "who are you" */
#define ACK	'\006'	/* (positive) ACKnowledge */
#define	BEL	'\007'	/* ring the BELl */
#define	BS	'\010'	/* BackSpace */
#define	HT	'\011'	/* Horizontal Tab */
#define	TAB	'\011'	/* an unofficial name for HT */
#define	LF	'\012'	/* Line Feed (does not imply cr) */
#define	NL	'\012'	/* unix unofficial name for LF: new line */
#define	VT	'\013'	/* Vertical Tab */
#define	FF	'\014'	/* Form Feed (new page starts AFTER this) */
#define	CR	'\015'	/* Carriage Return */
#define	SO	'\016'	/* Shift Out; select alternate character set */
#define	SI	'\017'	/* Shift In; select ASCII again */
#define	DLE	'\020'	/* Data Link Escape */
#define	DC1	'\021'	/* Device Control 1 */
#define XON	'\021'	/* transmitter on, resume output */
#define	DC2	'\022'	/* Device Control 2 (auxiliary on) */
#define	DC3	'\023'	/* Device Control 3 */
#define	XOFF	'\023'	/* transmitter off, suspend output */
#define	DC4	'\024'	/* Device Control 4 (auxiliary off) */
#define	NAK	'\025'	/* Negative AcKnowledge (signal error) */
#define	SYN	'\026'	/* SYNchronous idle */
#define	ETB	'\027'	/* End of Transmission Block, logical end of medium */
#define	CAN	'\030'	/* CANcel */
#define	EM	'\031'	/* End of Medium */
#define	SUB	'\032'	/* SUBstitute */
#define	ESC	'\033'	/* ESCape */
#define	FS	'\034'	/* File Separator */
#define	GS	'\035'	/* Group Separator */
#define	RS	'\036'	/* Record Separator */
#define	US	'\037'	/* Unit Separator */
#define	SP	'\040'	/* SPace */
#define	DEL	'\177'	/* DELete, rubout */