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+/* See LICENSE for licence details. */
+
+#define _XOPEN_SOURCE
+#include <ctype.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/ioctl.h>
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/Xutil.h>
+
+/* special keys */
+#define KEYDELETE "\033[3~"
+#define KEYHOME "\033[1~"
+#define KEYEND "\033[4~"
+#define KEYPREV "\033[5~"
+#define KEYNEXT "\033[6~"
+
+#define TNAME "st"
+#define SHELL "/bin/bash"
+#define TAB 8
+
+#define FONT "-*-terminus-medium-r-normal-*-14-*-*-*-*-*-*-*"
+#define BORDER 3
+#define LINESPACE 1 /* additional pixel between each line */
+
+/* Default colors */
+#define DefaultFG 7
+#define DefaultBG 0
+#define DefaultCS 1
+#define BellCol DefaultFG /* visual bell color */
+
+static char* colorname[] = {
+ "black",
+ "red",
+ "green",
+ "yellow",
+ "blue",
+ "magenta",
+ "cyan",
+ "white",
+};
+
+
+/* Arbitrary sizes */
+#define ESCSIZ 256
+#define ESCARG 16
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) < (b) ? (b) : (a))
+#define LEN(a) (sizeof(a) / sizeof(a[0]))
+#define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+#define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
+#define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
+
+
+enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 }; /* Attribute */
+enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload }; /* Cursor */
+enum { CRset=1 , CRupdate=2 }; /* Character state */
+enum { TMwrap=1 , TMinsert=2 }; /* Terminal mode */
+enum { SCupdate, SCredraw }; /* screen draw mode */
+
+#ifdef TRUECOLOR
+#error Truecolor not implemented yet
+typedef int Color;
+#else
+typedef char Color;
+#endif
+
+
+typedef struct {
+ char c; /* character code */
+ char mode; /* attribute flags */
+ Color fg; /* foreground */
+ Color bg; /* background */
+ char state; /* state flag */
+} Glyph;
+
+typedef Glyph* Line;
+
+typedef struct {
+ Glyph attr; /* current char attributes */
+ char hidden;
+ int x;
+ int y;
+} TCursor;
+
+/* Escape sequence structs */
+typedef struct {
+ char buf[ESCSIZ+1]; /* raw string */
+ int len; /* raw string length */
+ /* ESC <pre> [[ [<priv>] <arg> [;]] <mode>] */
+ char pre;
+ char priv;
+ int arg[ESCARG+1];
+ int narg; /* nb of args */
+ char mode;
+} Escseq;
+
+/* Internal representation of the screen */
+typedef struct {
+ int row; /* nb row */
+ int col; /* nb col */
+ Line* line; /* screen */
+ TCursor c; /* cursor */
+ int top; /* top scroll limit */
+ int bot; /* bottom scroll limit */
+ int mode; /* terminal mode */
+} Term;
+
+/* Purely graphic info */
+typedef struct {
+ Display* dis;
+ Window win;
+ int scr;
+ int w; /* window width */
+ int h; /* window height */
+ int ch; /* char height */
+ int cw; /* char width */
+} XWindow;
+
+/* Drawing Context */
+typedef struct {
+ unsigned long col[LEN(colorname)];
+ XFontStruct* font;
+ GC gc;
+} DC;
+
+
+void die(const char *errstr, ...);
+void draw(int);
+void execsh(void);
+void kpress(XKeyEvent *);
+void resize(XEvent *);
+void run(void);
+
+int escaddc(char);
+int escfinal(char);
+void escdump(void);
+void eschandle(void);
+void escparse(void);
+void escreset(void);
+
+void tclearregion(int, int, int, int);
+void tcpos(int);
+void tcursor(int);
+void tdeletechar(int);
+void tdeleteline(int);
+void tdump(void);
+void tinsertblank(int);
+void tinsertblankline(int);
+void tmoveto(int, int);
+void tnew(int, int);
+void tnewline(void);
+void tputc(char);
+void tputs(char*, int);
+void tresize(int, int);
+void tscroll(void);
+void tsetattr(int*, int);
+void tsetchar(char);
+void tsetscroll(int, int);
+
+void ttynew(void);
+void ttyread(void);
+void ttyresize(int, int);
+void ttywrite(char *, size_t);
+
+unsigned long xgetcol(const char *);
+void xclear(int, int, int, int);
+void xcursor(int);
+void xdrawc(int, int, Glyph);
+void xinit(void);
+void xscroll(void);