X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=st.c;h=559dcda5789bc1c0c358640cbbf2a9b820b628a5;hb=cf65699a29683bff9d50187c18b160e21a538f48;hp=9a8fa35f756e25a840a86b1b966e9fea28143822;hpb=2f35cef54b5a32b5498aded0a25f78d0d973a152;p=st.git

diff --git a/st.c b/st.c
index 9a8fa35..559dcda 100644
--- a/st.c
+++ b/st.c
@@ -1,13 +1,174 @@
-/* See LICENSE for licence details.	 */
-#include "st.h"
+/* See LICENSE for licence details. */
+#define _XOPEN_SOURCE 600
+#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;
+
+static void die(const char *errstr, ...);
+static void draw(int);
+static void execsh(void);
+static void sigchld(int);
+static void run(void);
+
+static int escaddc(char);
+static int escfinal(char);
+static void escdump(void);
+static void eschandle(void);
+static void escparse(void);
+static void escreset(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 tdump(void);
+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 void kpress(XEvent *);
+static void resize(XEvent *);
+
+static void (*handler[LASTEvent])(XEvent *) = {
+	[KeyPress] = kpress,
+	[Expose] = expose,
+	[ConfigureNotify] = resize
+};
 
 /* Globals */
-DC dc;
-XWindow xw;
-Term term;
-Escseq escseq;
-int cmdfd;
-int running;
+static DC dc;
+static XWindow xw;
+static Term term;
+static Escseq escseq;
+static int cmdfd;
+static pid_t pid;
+static int running;
 
 void
 die(const char *errstr, ...) {
@@ -27,34 +188,44 @@ execsh(void) {
 }
 
 void
-xbell(void) {	/* visual bell */
+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);
+	/* 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;
-	pid_t pid;
 	char *pts;
 
 	if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
-		die("openpt");
-	if(grantpt(m) == -1)
-		die("grandpt");
-	if(unlockpt(m) == -1)
-		die("unlockpt");
-	if((pts = ptsname(m)) == NULL)
-		die("ptsname");
+		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("slave open");
+		die("Couldn't open slave: %s\n", SERRNO);
 	fcntl(s, F_SETFL, O_NDELAY);
 	switch(pid = fork()) {
 	case -1:
-		die("fork");
+		die("fork failed\n");
 		break;
 	case 0:
 		setsid(); /* create a new process group */
@@ -62,12 +233,13 @@ ttynew(void) {
 		dup2(s, STDOUT_FILENO);
 		dup2(s, STDERR_FILENO);
 		if(ioctl(s, TIOCSCTTY, NULL) < 0)
-			die("slave TTIOCSTTY");
+			die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
 		execsh();
 		break;
 	default:
 		close(s);
 		cmdfd = m;
+		signal(SIGCHLD, sigchld);
 	}
 }
 
@@ -85,9 +257,8 @@ ttyread(void) {
 	int ret;
 
 	switch(ret = read(cmdfd, buf, BUFSIZ)) {
-	case -1: /* error or exit */
-		/* XXX: be more precise */
-		running = 0;
+	case -1: 
+		die("Couldn't read from shell: %s\n", SERRNO);
 		break;
 	default:
 		tputs(buf, ret);
@@ -95,9 +266,9 @@ ttyread(void) {
 }
 
 void
-ttywrite(char *s, size_t n) {
+ttywrite(const char *s, size_t n) {
 	if(write(cmdfd, s, n) == -1)
-		die("write error on tty.");
+		die("write error on tty: %s\n", SERRNO);
 }
 
 void
@@ -108,7 +279,7 @@ ttyresize(int x, int y) {
 	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: %m\n");
+		fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 }
 
 int
@@ -162,21 +333,19 @@ 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;
-	xscroll();	  
 }
 
 void
 tnewline(void) {
 	int y = term.c.y + 1;
-
-	if(y > term.bot) {
+	if(y > term.bot)
 		tscroll(), y = term.bot;
-	}
 	tmoveto(0, y);
 }
 
@@ -310,6 +479,13 @@ tinsertblank(int n) {
 	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;
@@ -331,10 +507,11 @@ tinsertblankline (int 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;
@@ -356,6 +533,8 @@ tdeleteline(int n) {
 		term.line[i+n] = blank;
 		/* blank it */
 		memset(blank, 0, term.col * sizeof(Glyph));
+		tsetlinestate(i, CRupdate);
+		tsetlinestate(i-n, CRupdate);
 	}
 }
 
@@ -363,48 +542,48 @@ 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;
-			}
+	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
@@ -422,13 +601,18 @@ tsetscroll(int t, int b) {
 	term.bot = b;	 
 }
 
-
 void
-eschandle(void) { 
-	/* escdump(); */
+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]);
@@ -546,15 +730,13 @@ eschandle(void) {
 void
 escdump(void) { 
 	int i;
-	puts("------");
 	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) {
+	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);
 }
 
@@ -676,7 +858,6 @@ xgetcol(const char *s) {
 	return color.pixel;
 }
 
-
 void
 xclear(int x1, int y1, int x2, int y2) {
 	XClearArea(xw.dis, xw.win, 
@@ -685,7 +866,6 @@ xclear(int x1, int y1, int x2, int y2) {
 			False);
 }
 
-
 void
 xscroll(void) {
 	int srcy = (term.top+1) * xw.ch;
@@ -697,9 +877,6 @@ xscroll(void) {
 	xclear(0, term.bot, term.col-1, term.bot);
 }
 
-
-
-
 void
 xinit(void) {
 	XGCValues values;
@@ -713,11 +890,11 @@ xinit(void) {
 	xw.dis = XOpenDisplay(NULL);
 	xw.scr = XDefaultScreen(xw.dis);
 	if(!xw.dis)
-		die("can not open display");
+		die("Can't open display\n");
 	
 	/* font */
 	if(!(dc.font = XLoadQueryFont(xw.dis, FONT)))
-		die("can not find font " 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;
@@ -793,14 +970,15 @@ xcursor(int mode) {
 	/* remove the old cursor */
 	if(term.line[oldy][oldx].state & CRset)
 		xdrawc(oldx, oldy, term.line[oldy][oldx]);
-	else xclear(oldx, oldy, oldx, oldy); /* XXX: maybe a bug */
-	if(mode == CSdraw && !term.c.hidden) {
+	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;
@@ -808,14 +986,18 @@ draw(int redraw_all) {
 
 	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((changed && set) || (redraw_all && set)) {
+			if(redraw_all || changed) {
 				term.line[y][x].state &= ~CRupdate;
-				xdrawc(x, y, term.line[y][x]);
+				if(set)
+					xdrawc(x, y, term.line[y][x]);
+				else
+					xclear(x, y, x, y);
 			}
 		}
 	}
@@ -823,7 +1005,13 @@ draw(int redraw_all) {
 }
 
 void
-kpress(XKeyEvent *e) {
+expose(XEvent *ev) {
+	draw(SCredraw);
+}
+
+void
+kpress(XEvent *ev) {
+	XKeyEvent *e = &ev->xkey;
 	KeySym ksym;
 	char buf[32];
 	int len;
@@ -833,35 +1021,23 @@ kpress(XKeyEvent *e) {
 	meta  = e->state & Mod1Mask;
 	shift = e->state & ShiftMask;
 	len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
-	if(len > 0) {
+	if(key[ksym])
+		ttywrite(key[ksym], strlen(key[ksym]));
+	else if(len > 0) {
 		buf[sizeof(buf)-1] = '\0';
 		if(meta && len == 1)
 			ttywrite("\033", 1);
 		ttywrite(buf, len);
-		return;
-	}
-	switch(ksym) {
-	default:
-		fprintf(stderr, "errkey: %d\n", (int)ksym);
-		break;
-	case XK_Up:
-	case XK_Down:
-	case XK_Left:
-	case XK_Right:
-		sprintf(buf, "\033[%c", "DACB"[ksym - XK_Left]);
-		ttywrite(buf, 3);
-		break;
-	case XK_Delete: ttywrite(KEYDELETE, sizeof(KEYDELETE)-1); break;
-	case XK_Home:  ttywrite(KEYHOME, sizeof(KEYHOME)-1); break;
-	case XK_End:   ttywrite(KEYEND,  sizeof(KEYEND) -1); break;
-	case XK_Prior: ttywrite(KEYPREV, sizeof(KEYPREV)-1); break;
-	case XK_Next:  ttywrite(KEYNEXT, sizeof(KEYNEXT)-1); break;
-	case XK_Insert:
-		/* XXX: paste X clipboard */
-		if(shift)
-			;
-		break;
-	}
+	} else
+		switch(ksym) {
+		case XK_Insert:
+			if(shift)
+				/* XXX: paste X clipboard */;
+			break;
+		default:
+			fprintf(stderr, "errkey: %d\n", (int)ksym);
+			break;
+		}
 }
 
 void
@@ -879,52 +1055,34 @@ resize(XEvent *e) {
 	}
 }
 
-
 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); /* seems to fix the resize bug in wmii */
-	
+	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) {
-			fprintf(stderr, "select: %m\n");
-			running = 0;
-		}
-		
-		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(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
+			if(errno == EINTR)
+				continue;
+			die("select failed: %s\n", SERRNO);
 		}
 		if(FD_ISSET(cmdfd, &rfd)) {
 			ttyread();
 			draw(SCupdate);
 		}
+		while(XPending(xw.dis)) {
+			XNextEvent(xw.dis, &ev);
+			if(handler[ev.type])
+				(handler[ev.type])(&ev);
+		}
 	}
 }