ANSI

ANSI escape sequences

ANSI escape sequences are a standard for in-band-signaling
to control cursor location,color,font styling, and other options on video text terminal and terminal
emulators.

C0 control codes

Fe Escape code

if the ESC is followed by a byte in the range 0x40 to 0x5f,the escape sequences is ot type Fe.

some type Fe ANSI escape sequences

Code	C1	Abbr	Name	Effect
ESC [	0x9B	CSI	Control sequences Introducer

ANSI control sequences

• CSI

some ANSI control sequences

Code	Abbr	Name	Effect
CSI n m	SGR	Select Graphic Rendition	Sets colors and style of the characters following this code

SGR(Select Graphic Rendition) parameters

The control sequences CSI n m,named Select Graphic
Rendition(SGR),
sets display attribute.

n	Name	Note
0	Reset or normal	All attributes off
1	Bold or increased intensity
2	Faint,decreased intensity,or dim	May be implemented as a light font weight like bold
3	Italic
4	underline
30-37	set foreground color
40-47	set background color
90-97	set bright foreground color
100-107	set bright background color

colors

• colors

Several attributes can be set in the same sequences,separated by the semicolons(;).
Each display attributes remains in effect util the following occurrence of SGR resets it.
If no codes are give,CSI m is treated as CSI 0m(reset/normal)

Examples:

`ESC[0m`:reset all attributes
`ESC[31m`:to get red letters
`ESC[1;30;47m`:to get bold(bright) black letters on white background color 

FG	BG	Name
30	40	Black
31	41	Red
32	42	Green
33	43	Yellow
34	44	Blue
35	45	Magenta
36	46	Cyan
37	47	White

\033 represents ESC in ASCII code

#define ASNI_FG_BLACK   "\33[1;30m"
#define ASNI_FG_RED     "\33[1;31m"
#define ASNI_FG_GREEN   "\33[1;32m"
#define ASNI_FG_YELLOW  "\33[1;33m"
#define ASNI_FG_BLUE    "\33[1;34m"
#define ASNI_FG_MAGENTA "\33[1;35m"
#define ASNI_FG_CYAN    "\33[1;36m"
#define ASNI_FG_WHITE   "\33[1;37m"
#define ASNI_BG_BLACK   "\33[1;40m"
#define ASNI_BG_RED     "\33[1;41m"
#define ASNI_BG_GREEN   "\33[1;42m"
#define ASNI_BG_YELLOW  "\33[1;43m"
#define ASNI_BG_BLUE    "\33[1;44m"
#define ASNI_BG_MAGENTA "\33[1;35m"
#define ASNI_BG_CYAN    "\33[1;46m"
#define ASNI_BG_WHITE   "\33[1;47m"
#define ASNI_NONE       "\33[0m"