path: root/st.c

/* See LICENSE for licence details. */
#define _XOPEN_SOURCE 600
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <locale.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>

#define TNAME "xterm"

/* Arbitrary sizes */
#define TITLESIZ 256
#define ESCSIZ 256
#define ESCARGSIZ 16
#define MAXDRAWBUF 1024

#define SERRNO strerror(errno)
#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)
#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)

/* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
enum { ATnone=0 , ATreverse=1 , ATunderline=2, ATbold=4 };
enum { CSup, CSdown, CSright, CSleft, CShide, CSdraw, CSwrap, CSsave, CSload };
enum { CRset=1, CRupdate=2 };
enum { TMwrap=1, TMinsert=2, TMtitle=4 };
enum { ESCin = 1, ESCcsi = 2, ESCosc = 4, ESCtitle = 8 };
enum { SCupdate, SCredraw };

typedef int Color;

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;

/* CSI Escape sequence structs */
/* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
typedef struct {
	char buf[ESCSIZ]; /* raw string */
	int len;            /* raw string length */
	char priv;
	int arg[ESCARGSIZ];
	int narg;           /* nb of args */
	char mode;
} CSIEscape;

/* 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 */
	int esc;
	char title[TITLESIZ];
	int titlelen;
} 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; 

typedef struct {
	KeySym k;
	char s[ESCSIZ];
} Key;

#include "config.h"

/* Drawing Context */
typedef struct {
	unsigned long col[LEN(colorname)];
	XFontStruct* font;
	GC gc;
} DC;

static void die(const char *errstr, ...);
static void draw(int);
static void execsh(void);
static void sigchld(int);
static void run(void);

static void csidump(void);
static void csihandle(void);
static void csiparse(void);
static void csireset(void);

static void tclearregion(int, int, int, int);
static void tcpos(int);
static void tcursor(int);
static void tdeletechar(int);
static void tdeleteline(int);
static void tinsertblank(int);
static void tinsertblankline(int);
static void tmoveto(int, int);
static void tnew(int, int);
static void tnewline(void);
static void tputc(char);
static void tputs(char*, int);
static void tresize(int, int);
static void tscroll(void);
static void tsetattr(int*, int);
static void tsetchar(char);
static void tsetscroll(int, int);

static void ttynew(void);
static void ttyread(void);
static void ttyresize(int, int);
static void ttywrite(const char *, size_t);

static unsigned long xgetcol(const char *);
static void xclear(int, int, int, int);
static void xcursor(int);
static void xdrawc(int, int, Glyph);
static void xinit(void);
static void xscroll(void);

static void expose(XEvent *);
static char * kmap(KeySym);
static void kpress(XEvent *);
static void resize(XEvent *);

static void (*handler[LASTEvent])(XEvent *) = {
	[KeyPress] = kpress,
	[Expose] = expose,
	[ConfigureNotify] = resize
};

/* Globals */
static DC dc;
static XWindow xw;
static Term term;
static CSIEscape escseq;
static int cmdfd;
static pid_t pid;
static int running;

#ifdef DEBUG
void
tdump(void) {
	int row, col;
	Glyph c;

	for(row = 0; row < term.row; row++) {
		for(col = 0; col < term.col; col++) {
			if(col == term.c.x && row == term.c.y)
				putchar('#');
			else {
				c = term.line[row][col];
				putchar(c.state & CRset ? c.c : '.');
			}
		}
		putchar('\n');
	}
}
#endif

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