X-Git-Url: https://jasonwoof.com/gitweb/?a=blobdiff_plain;f=st.c;h=a7f957b1c52ee6ba40e89c46af79c2cae25c8437;hb=0a5e5102096d65a3ba8e39ea9b9b0eb89fe30e04;hp=a3421ffee3420ac641bb638c2b7aa890631062b1;hpb=375efb8891a2d131d46f1582fd770d34464094e0;p=st.git

diff --git a/st.c b/st.c
index a3421ff..a7f957b 100644
--- a/st.c
+++ b/st.c
@@ -1,11 +1,1113 @@
-/* See LICENSE file for copyright and license details. */
+/* See LICENSE for licence details. */
+#define _XOPEN_SOURCE
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.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 "st"
+
+/* Arbitrary sizes */
+#define ESCSIZ 256
+#define ESCARG 16
+
+#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)
+
+/* 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 };
+enum { SCupdate, SCredraw };
+
+typedef int Color;
+
+typedef struct {
+	KeySym k;
+	char s[ESCSIZ];
+} Key;
+
+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 */
+/* ESC <pre> [[ [<priv>] <arg> [;]] <mode>] */
+typedef struct {
+	char buf[ESCSIZ+1]; /* raw string */
+	int len;            /* raw string length */
+	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; 
+
+#include "config.h"
+
+/* 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 sigchld(int);
+char* kmap(KeySym);
+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);
+
+/* Globals */
+DC dc;
+XWindow xw;
+Term term;
+Escseq escseq;
+int cmdfd;
+pid_t pid;
+int running;
+
+void
+die(const char *errstr, ...) {
+	va_list ap;
+
+	va_start(ap, errstr);
+	vfprintf(stderr, errstr, ap);
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}
+
+void
+execsh(void) {
+	char *args[3] = {SHELL, "-i", NULL};
+	putenv("TERM=" TNAME);
+	execvp(SHELL, args);
+}
+
+void
+xbell(void) { /* visual bell */
+	XRectangle r = { 0, 0, xw.w, xw.h };
+	XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
+	XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
+	/* usleep(30000); */
+	draw(SCredraw);
+}
+
+void 
+sigchld(int a) {
+	int stat = 0;
+	if(waitpid(pid, &stat, 0) < 0)
+		die("Waiting for pid %hd failed: %s\n",	pid, SERRNO);
+	if(WIFEXITED(stat))
+		exit(WEXITSTATUS(stat));
+	else
+		exit(EXIT_FAILURE);
+}
+
+void
+ttynew(void) {
+	int m, s;
+	char *pts;
+
+	if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
+		die("openpt failed: %s\n", SERRNO);
+	if(grantpt(m) < 0)
+		die("grandpt failed: %s\n", SERRNO);
+	if(unlockpt(m) < 0)
+		die("unlockpt failed: %s\n", SERRNO);
+	if(!(pts = ptsname(m)))
+		die("ptsname failed: %s\n", SERRNO);
+	if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
+		die("Couldn't open slave: %s\n", SERRNO);
+	fcntl(s, F_SETFL, O_NDELAY);
+	switch(pid = fork()) {
+	case -1:
+		die("fork failed\n");
+		break;
+	case 0:
+		setsid(); /* create a new process group */
+		dup2(s, STDIN_FILENO);
+		dup2(s, STDOUT_FILENO);
+		dup2(s, STDERR_FILENO);
+		if(ioctl(s, TIOCSCTTY, NULL) < 0)
+			die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
+		execsh();
+		break;
+	default:
+		close(s);
+		cmdfd = m;
+		signal(SIGCHLD, sigchld);
+	}
+}
+
+void
+dump(char c) {
+	static int col;
+	fprintf(stderr, " %02x %c ", c, isprint(c)?c:'.');
+	if(++col % 10 == 0)
+		fprintf(stderr, "\n");
+}
+
+void
+ttyread(void) {
+	char buf[BUFSIZ] = {0};
+	int ret;
+
+	switch(ret = read(cmdfd, buf, BUFSIZ)) {
+	case -1: 
+		die("Couldn't read from shell: %s\n", SERRNO);
+		break;
+	default:
+		tputs(buf, ret);
+	}
+}
+
+void
+ttywrite(char *s, size_t n) {
+	if(write(cmdfd, s, n) == -1)
+		die("write error on tty: %s\n", SERRNO);
+}
+
+void
+ttyresize(int x, int y) {
+	struct winsize w;
+
+	w.ws_row = term.row;
+	w.ws_col = term.col;
+	w.ws_xpixel = w.ws_ypixel = 0;
+	if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
+		fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
+}
+
+int
+escfinal(char c) {
+	if(escseq.len == 1)
+		switch(c) {
+		case '[':
+		case ']':
+		case '(':
+			return 0;
+		case '=':
+		case '>':
+		default:
+			return 1;
+		}
+	else if(BETWEEN(c, 0x40, 0x7E))
+		return 1;
+	return 0;	  
+}
+
+void
+tcpos(int mode) {
+	static int x = 0;
+	static int y = 0;
+
+	if(mode == CSsave)
+		x = term.c.x, y = term.c.y;
+	else if(mode == CSload)
+		tmoveto(x, y);
+}
+
+void
+tnew(int col, int row) {   /* screen size */
+	term.row = row, term.col = col;
+	term.top = 0, term.bot = term.row - 1;
+	/* mode */
+	term.mode = TMwrap;
+	/* cursor */
+	term.c.attr.mode = ATnone;
+	term.c.attr.fg = DefaultFG;
+	term.c.attr.bg = DefaultBG;
+	term.c.x = term.c.y = 0;
+	term.c.hidden = 0;
+	/* allocate screen */
+	term.line = calloc(term.row, sizeof(Line));
+	for(row = 0 ; row < term.row; row++)
+		term.line[row] = calloc(term.col, sizeof(Glyph));
+}
+
+void
+tscroll(void) {
+	Line temp = term.line[term.top];
+	int i;
+	/* X stuff _before_ the line swapping (results in wrong line index) */
+	xscroll();
+	for(i = term.top; i < term.bot; i++)
+		term.line[i] = term.line[i+1];
+	memset(temp, 0, sizeof(Glyph) * term.col);
+	term.line[term.bot] = temp;
+}
+
+void
+tnewline(void) {
+	int y = term.c.y + 1;
+	if(y > term.bot)
+		tscroll(), y = term.bot;
+	tmoveto(0, y);
+}
+
+int
+escaddc(char c) {
+	escseq.buf[escseq.len++] = c;
+	if(escfinal(c) || escseq.len >= ESCSIZ) {
+		escparse(), eschandle();
+		return 0;
+	}
+	return 1;
+}
+
+void
+escparse(void) {
+	/* int noarg = 1; */
+	char *p = escseq.buf;
+
+	escseq.narg = 0;
+	switch(escseq.pre = *p++) {
+	case '[': /* CSI */
+		if(*p == '?')
+			escseq.priv = 1, p++;
+
+		while(p < escseq.buf+escseq.len) {
+			while(isdigit(*p)) {
+				escseq.arg[escseq.narg] *= 10;
+				escseq.arg[escseq.narg] += *(p++) - '0'/*, noarg = 0 */;
+			}
+			if(*p == ';')
+				escseq.narg++, p++;
+			else {
+				escseq.mode = *p;
+				escseq.narg++;
+				return;
+			}
+		}
+		break;
+	case '(':
+		/* XXX: graphic character set */
+		break;
+	}
+}
+
+void
+tmoveto(int x, int y) {
+	term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
+	term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
+}
+
+void
+tcursor(int dir) {
+	int xf = term.c.x, yf = term.c.y;
+
+	switch(dir) {
+	case CSup:
+		yf--;
+		break;
+	case CSdown:
+		yf++;
+		break;
+	case CSleft:
+		xf--;
+		if(xf < 0) {
+			xf = term.col-1, yf--;
+			if(yf < term.top)
+				yf = term.top, xf = 0;
+		}
+		break;
+	case CSright:
+		xf++;
+		if(xf >= term.col) {
+			xf = 0, yf++;
+			if(yf > term.bot)
+				yf = term.bot, tscroll();
+		}
+		break;
+	}
+	tmoveto(xf, yf);
+}
+
+void
+tsetchar(char c) {
+	term.line[term.c.y][term.c.x] = term.c.attr;
+	term.line[term.c.y][term.c.x].c = c;
+	term.line[term.c.y][term.c.x].state |= CRset | CRupdate;
+}
+
+void
+tclearregion(int x1, int y1, int x2, int y2) {
+	int x, y;
+
+	LIMIT(x1, 0, term.col-1);
+	LIMIT(x2, 0, term.col-1);
+	LIMIT(y1, 0, term.row-1);
+	LIMIT(y2, 0, term.row-1);
+
+	/* XXX: could be optimized */
+	for(x = x1; x <= x2; x++)
+		for(y = y1; y <= y2; y++)
+			memset(&term.line[y][x], 0, sizeof(Glyph));
+
+	xclear(x1, y1, x2, y2);
+}
+
+void
+tdeletechar(int n) {
+	int src = term.c.x + n;
+	int dst = term.c.x;
+	int size = term.col - src;
+
+	if(src >= term.col) {
+		tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+		return;
+	}
+	memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
+	tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
+}
+
+void
+tinsertblank(int n) {
+	int src = term.c.x;
+	int dst = src + n;
+	int size = term.col - n - src;
+
+	if(dst >= term.col) {
+		tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+		return;
+	}
+	memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
+	tclearregion(src, term.c.y, dst, term.c.y);
+}
+
+void
+tsetlinestate(int n, int state) {
+	int i;
+	for(i = 0; i < term.col; i++)
+		term.line[n][i].state |= state;
+}
+
+void
+tinsertblankline (int n) {
+	int i;
+	Line blank;
+	int bot = term.bot;
+
+	if(term.c.y > term.bot)
+		bot = term.row - 1;
+	else if(term.c.y < term.top)
+		bot = term.top - 1;
+	if(term.c.y + n >= bot) {
+		tclearregion(0, term.c.y, term.col-1, bot);
+		return;
+	}
+	for(i = bot; i >= term.c.y+n; i--) {
+		/* swap deleted line <-> blanked line */
+		blank = term.line[i];
+		term.line[i] = term.line[i-n];
+		term.line[i-n] = blank;
+		/* blank it */
+		memset(blank, 0, term.col * sizeof(Glyph));
+		tsetlinestate(i, CRupdate);
+		tsetlinestate(i-n, CRupdate);
+	}
+}
+
+void
+tdeleteline(int n) {
+	int i;
+	Line blank;
+	int bot = term.bot;
+
+	if(term.c.y > term.bot)
+		bot = term.row - 1;
+	else if(term.c.y < term.top)
+		bot = term.top - 1;
+	if(term.c.y + n >= bot) {
+		tclearregion(0, term.c.y, term.col-1, bot);
+		return;
+	}
+	for(i = term.c.y; i <= bot-n; i++) {
+		/* swap deleted line <-> blanked line */
+		blank = term.line[i];
+		term.line[i] = term.line[i+n];
+		term.line[i+n] = blank;
+		/* blank it */
+		memset(blank, 0, term.col * sizeof(Glyph));
+		tsetlinestate(i, CRupdate);
+		tsetlinestate(i-n, CRupdate);
+	}
+}
+
+void
+tsetattr(int *attr, int l) {
+	int i;
+
+	for(i = 0; i < l; i++) {
+		switch(attr[i]) {
+		case 0:
+			memset(&term.c.attr, 0, sizeof(term.c.attr));
+			term.c.attr.fg = DefaultFG;
+			term.c.attr.bg = DefaultBG;
+			break;
+		case 1:
+			term.c.attr.mode |= ATbold;	 
+			break;
+		case 4: 
+			term.c.attr.mode |= ATunderline;
+			break;
+		case 7: 
+			term.c.attr.mode |= ATreverse;	
+			break;
+		case 8:
+			term.c.hidden = CShide;
+			break;
+		case 22: 
+			term.c.attr.mode &= ~ATbold;  
+			break;
+		case 24: 
+			term.c.attr.mode &= ~ATunderline;
+			break;
+		case 27: 
+			term.c.attr.mode &= ~ATreverse;	 
+			break;
+		case 39:
+			term.c.attr.fg = DefaultFG;
+			break;
+		case 49:
+			term.c.attr.fg = DefaultBG;
+			break;
+		default:
+			if(BETWEEN(attr[i], 30, 37))
+				term.c.attr.fg = attr[i] - 30;
+			else if(BETWEEN(attr[i], 40, 47))
+				term.c.attr.bg = attr[i] - 40;
+			break;
+		}
+	}
+}
+
+void
+tsetscroll(int t, int b) {
+	int temp;
+
+	LIMIT(t, 0, term.row-1);
+	LIMIT(b, 0, term.row-1);
+	if(t > b) {
+		temp = t;
+		t = b;
+		b = temp;
+	}
+	term.top = t;
+	term.bot = b;	 
+}
+
+void
+eschandle(void) {
+	switch(escseq.pre) {
+	default:
+		goto unknown_seq;
+	case '[':
+		switch(escseq.mode) {
+		default:
+		unknown_seq:
+			fprintf(stderr, "erresc: unknown sequence\n");
+			escdump();
+			break;
+		case '@': /* Insert <n> blank char */
+			DEFAULT(escseq.arg[0], 1);
+			tinsertblank(escseq.arg[0]);
+			break;
+		case 'A': /* Cursor <n> Up */
+		case 'e':
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(term.c.x, term.c.y-escseq.arg[0]);
+			break;
+		case 'B': /* Cursor <n> Down */
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(term.c.x, term.c.y+escseq.arg[0]);
+			break;
+		case 'C': /* Cursor <n> Forward */
+		case 'a':
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(term.c.x+escseq.arg[0], term.c.y);
+			break;
+		case 'D': /* Cursor <n> Backward */
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(term.c.x-escseq.arg[0], term.c.y);
+			break;
+		case 'E': /* Cursor <n> Down and first col */
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(0, term.c.y+escseq.arg[0]);
+			break;
+		case 'F': /* Cursor <n> Up and first col */
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(0, term.c.y-escseq.arg[0]);
+			break;
+		case 'G': /* Move to <col> */
+		case '`':
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(escseq.arg[0]-1, term.c.y);
+			break;
+		case 'H': /* Move to <row> <col> */
+		case 'f':
+			DEFAULT(escseq.arg[0], 1);
+			DEFAULT(escseq.arg[1], 1);
+			tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
+			break;
+		case 'J': /* Clear screen */
+			switch(escseq.arg[0]) {
+			case 0: /* below */
+				tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
+				break;
+			case 1: /* above */
+				tclearregion(0, 0, term.c.x, term.c.y);
+				break;
+			case 2: /* all */
+				tclearregion(0, 0, term.col-1, term.row-1);
+				break;				  
+			}
+			break;
+		case 'K': /* Clear line */
+			switch(escseq.arg[0]) {
+			case 0: /* right */
+				tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
+				break;
+			case 1: /* left */
+				tclearregion(0, term.c.y, term.c.x, term.c.y);
+				break;
+			case 2: /* all */
+				tclearregion(0, term.c.y, term.col-1, term.c.y);
+				break;
+			}
+			break;
+		case 'L': /* Insert <n> blank lines */
+			DEFAULT(escseq.arg[0], 1);
+			tinsertblankline(escseq.arg[0]);
+			break;
+		case 'l':
+			if(escseq.priv && escseq.arg[0] == 25)
+				term.c.hidden = 1;
+			break;
+		case 'M': /* Delete <n> lines */
+			DEFAULT(escseq.arg[0], 1);
+			tdeleteline(escseq.arg[0]);
+			break;
+		case 'P': /* Delete <n> char */
+			DEFAULT(escseq.arg[0], 1);
+			tdeletechar(escseq.arg[0]);
+			break;
+		case 'd': /* Move to <row> */
+			DEFAULT(escseq.arg[0], 1);
+			tmoveto(term.c.x, escseq.arg[0]-1);
+			break;
+		case 'h': /* Set terminal mode */
+			if(escseq.priv && escseq.arg[0] == 25)
+				term.c.hidden = 0;
+			break;
+		case 'm': /* Terminal attribute (color) */
+			tsetattr(escseq.arg, escseq.narg);
+			break;
+		case 'r':
+			if(escseq.priv)
+				;
+			else {
+				DEFAULT(escseq.arg[0], 1);
+				DEFAULT(escseq.arg[1], term.row);
+				tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
+			}
+			break;
+		case 's': /* Save cursor position */
+			tcpos(CSsave);
+			break;
+		case 'u': /* Load cursor position */
+			tcpos(CSload);
+			break;
+		}
+		break;
+	}
+}
+
+void
+escdump(void) { 
+	int i;
+	printf("rawbuf	: %s\n", escseq.buf);
+	printf("prechar : %c\n", escseq.pre);
+	printf("private : %c\n", escseq.priv ? '?' : ' ');
+	printf("narg	: %d\n", escseq.narg);
+	if(escseq.narg)
+		for(i = 0; i < escseq.narg; i++)
+			printf("\targ %d = %d\n", i, escseq.arg[i]);
+	printf("mode	: %c\n", escseq.mode);
+}
+
+void
+escreset(void) {
+	memset(&escseq, 0, sizeof(escseq));
+}
+
+void
+tputtab(void) {
+	int space = TAB - term.c.x % TAB;
+	
+	if(term.c.x + space >= term.col)
+		space--;
+	
+	for(; space > 0; space--)
+		tcursor(CSright);
+}
+
+void
+tputc(char c) {
+	static int inesc = 0;
+#if 0
+	dump(c);
+#endif	
+	/* start of escseq */
+	if(c == '\033')
+		escreset(), inesc = 1;
+	else if(inesc) {
+		inesc = escaddc(c);
+	} /* normal char */ 
+	else switch(c) { 
+		default:
+			tsetchar(c);
+			tcursor(CSright);
+			break;
+		case '\t':
+			tputtab();
+			break;
+		case '\b':
+			tcursor(CSleft);
+			break;
+		case '\r':
+			tmoveto(0, term.c.y);
+			break;
+		case '\n':
+			tnewline();
+			break;
+		case '\a':
+			xbell();
+			break;
+	}
+}
+
+void
+tputs(char *s, int len) { 
+	for(; len > 0; len--)
+		tputc(*s++);
+}
+
+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');
+	}
+}
+
+void
+tresize(int col, int row) {
+	int i;
+	Line *line;
+	int minrow = MIN(row, term.row);
+	int mincol = MIN(col, term.col);
+
+	if(col < 1 || row < 1)
+		return;
+	/* alloc */
+	line = calloc(row, sizeof(Line));
+	for(i = 0 ; i < row; i++)
+		line[i] = calloc(col, sizeof(Glyph));
+	/* copy */
+	for(i = 0 ; i < minrow; i++)
+		memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
+	/* free */
+	for(i = 0; i < term.row; i++)
+		free(term.line[i]);
+	free(term.line);
+	
+	LIMIT(term.c.x, 0, col-1);
+	LIMIT(term.c.y, 0, row-1);
+	LIMIT(term.top, 0, row-1);
+	LIMIT(term.bot, 0, row-1);
+	
+	term.bot = row-1;
+	term.line = line;
+	term.col = col, term.row = row;
+}
+
+unsigned long
+xgetcol(const char *s) {
+	XColor color;
+	Colormap cmap = DefaultColormap(xw.dis, xw.scr);
+
+	if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
+		color.pixel = WhitePixel(xw.dis, xw.scr);
+		fprintf(stderr, "Could not allocate color '%s'\n", s);
+	}
+	return color.pixel;
+}
+
+void
+xclear(int x1, int y1, int x2, int y2) {
+	XClearArea(xw.dis, xw.win, 
+			x1 * xw.cw, y1 * xw.ch, 
+			(x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch, 
+			False);
+}
+
+void
+xscroll(void) {
+	int srcy = (term.top+1) * xw.ch;
+	int dsty = term.top * xw.ch;
+	int height = (term.bot-term.top) * xw.ch;
+
+	xcursor(CShide);
+	XCopyArea(xw.dis, xw.win, xw.win, dc.gc, 0, srcy, xw.w, height, 0, dsty);
+	xclear(0, term.bot, term.col-1, term.bot);
+}
+
+void
+xinit(void) {
+	XGCValues values;
+	unsigned long valuemask;
+	XClassHint chint;
+	XWMHints wmhint;
+	XSizeHints shint;
+	char *args[] = {NULL};
+	int i;
+
+	xw.dis = XOpenDisplay(NULL);
+	xw.scr = XDefaultScreen(xw.dis);
+	if(!xw.dis)
+		die("Can't open display\n");
+	
+	/* font */
+	if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
+		die("Can't load font %s\n", FONT);
+
+	xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
+	xw.ch = dc.font->ascent + dc.font->descent + LINESPACE;
+
+	/* colors */
+	for(i = 0; i < LEN(colorname); i++)
+		dc.col[i] = xgetcol(colorname[i]);
+
+	term.c.attr.fg = DefaultFG;
+	term.c.attr.bg = DefaultBG;
+	term.c.attr.mode = ATnone;
+	/* windows */
+	xw.h = term.row * xw.ch;
+	xw.w = term.col * xw.cw;
+	/* XXX: this BORDER is useless after the first resize, handle it in xdraws() */
+	xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
+			xw.w, xw.h, BORDER, 
+			dc.col[DefaultBG],
+			dc.col[DefaultBG]);
+	/* gc */
+	values.foreground = XWhitePixel(xw.dis, xw.scr);
+	values.font = dc.font->fid;
+	valuemask = GCForeground | GCFont;
+	dc.gc = XCreateGC(xw.dis, xw.win, valuemask, &values);
+	XMapWindow(xw.dis, xw.win);
+	/* wm stuff */
+	chint.res_name = TNAME, chint.res_class = TNAME;
+	wmhint.input = 1, wmhint.flags = InputHint;
+	shint.height_inc = xw.ch, shint.width_inc = xw.cw;
+	shint.height = xw.h, shint.width = xw.w;
+	shint.flags = PSize | PResizeInc;
+	XSetWMProperties(xw.dis, xw.win, NULL, NULL, &args[0], 0, &shint, &wmhint, &chint);
+	XStoreName(xw.dis, xw.win, TNAME);
+	XSync(xw.dis, 0);
+}
+
+void
+xdrawc(int x, int y, Glyph g) {
+	XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
+	unsigned long xfg, xbg;
+
+	/* reverse video */
+	if(g.mode & ATreverse)
+		xfg = dc.col[g.bg], xbg = dc.col[g.fg];
+	else
+		xfg = dc.col[g.fg], xbg = dc.col[g.bg];
+	/* background */
+	XSetForeground(xw.dis, dc.gc, xbg);
+	XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
+	/* string */
+	XSetForeground(xw.dis, dc.gc, xfg);
+	XDrawString(xw.dis, xw.win, dc.gc, r.x, r.y+dc.font->ascent, &(g.c), 1);
+	if(g.mode & ATbold)	 /* XXX: bold hack (draw again at x+1) */
+		XDrawString(xw.dis, xw.win, dc.gc, r.x+1, r.y+dc.font->ascent, &(g.c), 1);
+	/* underline */
+	if(g.mode & ATunderline) {
+		r.y += dc.font->ascent + 1;
+		XDrawLine(xw.dis, xw.win, dc.gc, r.x, r.y, r.x+r.width-1, r.y);
+	}
+}
+
+void
+xcursor(int mode) {
+	static int oldx = 0;
+	static int oldy = 0;
+	Glyph g = {' ', ATnone, DefaultBG, DefaultCS, 0};
+	
+	LIMIT(oldx, 0, term.col-1);
+	LIMIT(oldy, 0, term.row-1);
+	
+	if(term.line[term.c.y][term.c.x].state & CRset)
+		g.c = term.line[term.c.y][term.c.x].c;
+	/* remove the old cursor */
+	if(term.line[oldy][oldx].state & CRset)
+		xdrawc(oldx, oldy, term.line[oldy][oldx]);
+	else 
+		xclear(oldx, oldy, oldx, oldy);
+	/* draw the new one */
+	if(mode == CSdraw) {
+		xdrawc(term.c.x, term.c.y, g);
+		oldx = term.c.x, oldy = term.c.y;
+	}
+}
+
+void
+draw(int redraw_all) {
+	int x, y;
+	int changed, set;
+
+	if(redraw_all)
+		XClearWindow(xw.dis, xw.win);
+
+	/* XXX: drawing could be optimised */
+	for(y = 0; y < term.row; y++) {
+		for(x = 0; x < term.col; x++) {
+			changed = term.line[y][x].state & CRupdate;
+			set = term.line[y][x].state & CRset;
+			if(redraw_all || changed) {
+				term.line[y][x].state &= ~CRupdate;
+				if(set)
+					xdrawc(x, y, term.line[y][x]);
+				else
+					xclear(x, y, x, y);
+			}
+		}
+	}
+	xcursor(CSdraw);
+}
+
+char*
+kmap(KeySym k) {
+	int i;
+	for(i = 0; i < LEN(key); i++)
+		if(key[i].k == k)
+			return (char*)key[i].s;
+	return NULL;
+}
+
+void
+kpress(XKeyEvent *e) {
+	KeySym ksym;
+	char buf[32];
+	int len;
+	int meta;
+	int shift;
+	char* skmap;
+
+	meta  = e->state & Mod1Mask;
+	shift = e->state & ShiftMask;
+	len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
+	if(skmap = kmap(ksym))
+		ttywrite(skmap, strlen(skmap));
+	else if(len > 0) {
+		buf[sizeof(buf)-1] = '\0';
+		if(meta && len == 1)
+			ttywrite("\033", 1);
+		ttywrite(buf, len);
+	} else
+		switch(ksym) {
+		case XK_Insert:
+			if(shift)
+				/* XXX: paste X clipboard */;
+			break;
+		default:
+			fprintf(stderr, "errkey: %d\n", (int)ksym);
+			break;
+		}
+}
+
+void
+resize(XEvent *e) {
+	int col, row;
+	col = e->xconfigure.width / xw.cw;
+	row = e->xconfigure.height / xw.ch;
+	
+	if(term.col != col || term.row != row) {
+		tresize(col, row);
+		ttyresize(col, row);
+		xw.w = e->xconfigure.width;
+		xw.h = e->xconfigure.height;
+		draw(SCredraw);
+	}
+}
+
+void
+run(void) {
+	int ret;
+	XEvent ev;
+	fd_set rfd;
+	int xfd = XConnectionNumber(xw.dis);
+
+	running = 1;
+	XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
+	XResizeWindow(xw.dis, xw.win, xw.w , xw.h); /* fix resize bug in wmii (?) */
+	
+	while(running) {
+		FD_ZERO(&rfd);
+		FD_SET(cmdfd, &rfd);
+		FD_SET(xfd, &rfd);
+		XFlush(xw.dis);
+		ret = select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL);
+
+		if(ret < 0)
+			die("select failed: %s\n", SERRNO);
+				
+		if(FD_ISSET(xfd, &rfd)) {
+			while(XPending(xw.dis)) {
+				XNextEvent(xw.dis, &ev);
+				switch (ev.type) {
+				default:
+					break;
+				case KeyPress:
+					kpress(&ev.xkey);
+					break;
+				case Expose:
+					draw(SCredraw);
+					break;
+				case ConfigureNotify:
+					resize(&ev);
+					break;
+				}
+			}
+		}
+		if(FD_ISSET(cmdfd, &rfd)) {
+			ttyread();
+			draw(SCupdate);
+		}
+	}
+}
 
 int
-Xmain(int argc, char *argv[]) {
-	if(argc == 2 && !strcmp("-v", argv[1]))
-		eprint("st-"VERSION", © 2007-2008 st engineers, see LICENSE for details\n");
+main(int argc, char *argv[]) {
+	if(argc == 2 && !strncmp("-v", argv[1], 3))
+		die("st-" VERSION ", © 2009 st engineers\n");
 	else if(argc != 1)
-		eprint("usage: st [-v]\n");
+		die("usage: st [-v]\n");
+	setlocale(LC_CTYPE, "");
+	tnew(80, 24);
+	ttynew();
+	xinit();
+	run();
 	return 0;
 }