update dwm.1

commit 244fa852 (and a9aa0d8) tried to fix overflow by checking
the number of items returned. however this is not sufficient
since the format may be lower than 32 bits.

to reproduce the crash, i used the reproducer given in commit
244fa85 but changed the XChangeProperty line to the following to
set the property to a 1 element 16 bit item:

	short si = 1;
	XChangeProperty(d, w, net_wm_state, XA_ATOM, 16,
		PropModeReplace, (unsigned char *)&si, 1);

this client reliably crashes dwm under ASAN since dwm is trying
to read a 32 bit value from a 16 bit one. fix it by checking for
format == 32 as well.

also change the access type from Atom to long, on my machine
Atom is typedef-ed to long already but that may not be true
everywere. the XGetWindowProperty manpage says format == 32 is
returned as `long` so use `long` directly.

(N.B: it also might be worth checking if the returned type is
 XA_ATOM as well, but i wasn't able to cause any crashes by
 setting different types so i'm leaving it out for now.)

LICENSE

@@ -1,5 +1,6 @@
 MIT/X Consortium License
 
+© 2010-2026 Hiltjo Posthuma <hiltjo@codemadness.org>
 © 2006-2019 Anselm R Garbe <anselm@garbe.ca>
 © 2006-2009 Jukka Salmi <jukka at salmi dot ch>
 © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
@@ -11,7 +12,6 @@ MIT/X Consortium License
 © 2008 Martin Hurton <martin dot hurton at gmail dot com>
 © 2008 Neale Pickett <neale dot woozle dot org>
 © 2009 Mate Nagy <mnagy at port70 dot net>
-© 2010-2016 Hiltjo Posthuma <hiltjo@codemadness.org>
 © 2010-2012 Connor Lane Smith <cls@lubutu.com>
 © 2011 Christoph Lohmann <20h@r-36.net>
 © 2015-2016 Quentin Rameau <quinq@fifth.space>

config.def.h

@@ -49,6 +49,7 @@ static const float mfact     = 0.55; /* factor of master area size [0.05..0.95]
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
 static const int lockfullscreen = 1; /* 1 will force focus on the fullscreen window */
+static const int refreshrate = 120;  /* refresh rate (per second) for client move/resize */
 
 static const Layout layouts[] = {
 	/* symbol     arrange function */

config.h

@@ -66,6 +66,7 @@ static const float mfact     = 0.55; /* factor of master area size [0.05..0.95]
 static const int nmaster     = 1;    /* number of clients in master area */
 static const int resizehints = 1;    /* 1 means respect size hints in tiled resizals */
 static const int lockfullscreen = 1; /* 1 will force focus on the fullscreen window */
+static const int refreshrate = 120;  /* refresh rate (per second) for client move/resize */
 
 static const Layout layouts[] = {
 	/* symbol     arrange function */

config.mk

@@ -1,5 +1,5 @@
 # dwm version
-VERSION = 6.5
+VERSION = 6.8
 
 # Customize below to fit your system
 

drw.c

@@ -9,54 +9,40 @@
 #include "util.h"
 
 #define UTF_INVALID 0xFFFD
-#define UTF_SIZ     4
 
-static const unsigned char utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
-static const unsigned char utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
-static const long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
-static const long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
-
-static long
-utf8decodebyte(const char c, size_t *i)
+static int
+utf8decode(const char *s_in, long *u, int *err)
 {
-	for (*i = 0; *i < (UTF_SIZ + 1); ++(*i))
-		if (((unsigned char)c & utfmask[*i]) == utfbyte[*i])
-			return (unsigned char)c & ~utfmask[*i];
-	return 0;
-}
-
-static size_t
-utf8validate(long *u, size_t i)
-{
-	if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
-		*u = UTF_INVALID;
-	for (i = 1; *u > utfmax[i]; ++i)
-		;
-	return i;
-}
-
-static size_t
-utf8decode(const char *c, long *u, size_t clen)
-{
-	size_t i, j, len, type;
-	long udecoded;
+	static const unsigned char lens[] = {
+		/* 0XXXX */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+		/* 10XXX */ 0, 0, 0, 0, 0, 0, 0, 0,  /* invalid */
+		/* 110XX */ 2, 2, 2, 2,
+		/* 1110X */ 3, 3,
+		/* 11110 */ 4,
+		/* 11111 */ 0,  /* invalid */
+	};
+	static const unsigned char leading_mask[] = { 0x7F, 0x1F, 0x0F, 0x07 };
+	static const unsigned int overlong[] = { 0x0, 0x80, 0x0800, 0x10000 };
 
+	const unsigned char *s = (const unsigned char *)s_in;
+	int len = lens[*s >> 3];
 	*u = UTF_INVALID;
-	if (!clen)
-		return 0;
-	udecoded = utf8decodebyte(c[0], &len);
-	if (!BETWEEN(len, 1, UTF_SIZ))
+	*err = 1;
+	if (len == 0)
 		return 1;
-	for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
-		udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
-		if (type)
-			return j;
-	}
-	if (j < len)
-		return 0;
-	*u = udecoded;
-	utf8validate(u, len);
 
+	long cp = s[0] & leading_mask[len - 1];
+	for (int i = 1; i < len; ++i) {
+		if (s[i] == '\0' || (s[i] & 0xC0) != 0x80)
+			return i;
+		cp = (cp << 6) | (s[i] & 0x3F);
+	}
+	/* out of range, surrogate, overlong encoding */
+	if (cp > 0x10FFFF || (cp >> 11) == 0x1B || cp < overlong[len - 1])
+		return len;
+
+	*err = 0;
+	*u = cp;
 	return len;
 }
 
@@ -192,8 +178,7 @@ drw_clr_create(Drw *drw, Clr *dest, const char *clrname)
 		die("error, cannot allocate color '%s'", clrname);
 }
 
-/* Wrapper to create color schemes. The caller has to call free(3) on the
- * returned color scheme when done using it. */
+/* Create color schemes. */
 Clr *
 drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
 {
@@ -201,7 +186,7 @@ drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
 	Clr *ret;
 
 	/* need at least two colors for a scheme */
-	if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(XftColor))))
+	if (!drw || !clrnames || clrcount < 2 || !(ret = ecalloc(clrcount, sizeof(Clr))))
 		return NULL;
 
 	for (i = 0; i < clrcount; i++)
@@ -209,6 +194,30 @@ drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount)
 	return ret;
 }
 
+void
+drw_clr_free(Drw *drw, Clr *c)
+{
+	if (!drw || !c)
+		return;
+
+	/* c is typedef XftColor Clr */
+	XftColorFree(drw->dpy, DefaultVisual(drw->dpy, drw->screen),
+	             DefaultColormap(drw->dpy, drw->screen), c);
+}
+
+void
+drw_scm_free(Drw *drw, Clr *scm, size_t clrcount)
+{
+	size_t i;
+
+	if (!drw || !scm)
+		return;
+
+	for (i = 0; i < clrcount; i++)
+		drw_clr_free(drw, &scm[i]);
+	free(scm);
+}
+
 void
 drw_setfontset(Drw *drw, Fnt *set)
 {
@@ -238,11 +247,11 @@ drw_rect(Drw *drw, int x, int y, unsigned int w, unsigned int h, int filled, int
 int
 drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lpad, const char *text, int invert)
 {
-	int i, ty, ellipsis_x = 0;
-	unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len;
+	int ty, ellipsis_x = 0;
+	unsigned int tmpw, ew, ellipsis_w = 0, ellipsis_len, hash, h0, h1;
 	XftDraw *d = NULL;
 	Fnt *usedfont, *curfont, *nextfont;
-	int utf8strlen, utf8charlen, render = x || y || w || h;
+	int utf8strlen, utf8charlen, utf8err, render = x || y || w || h;
 	long utf8codepoint = 0;
 	const char *utf8str;
 	FcCharSet *fccharset;
@@ -251,9 +260,8 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 	XftResult result;
 	int charexists = 0, overflow = 0;
 	/* keep track of a couple codepoints for which we have no match. */
-	enum { nomatches_len = 64 };
-	static struct { long codepoint[nomatches_len]; unsigned int idx; } nomatches;
-	static unsigned int ellipsis_width = 0;
+	static unsigned int nomatches[128], ellipsis_width, invalid_width;
+	static const char invalid[] = "<EFBFBD>";
 
 	if (!drw || (render && (!drw->scheme || !w)) || !text || !drw->fonts)
 		return 0;
@@ -263,6 +271,8 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 	} else {
 		XSetForeground(drw->dpy, drw->gc, drw->scheme[invert ? ColFg : ColBg].pixel);
 		XFillRectangle(drw->dpy, drw->drawable, drw->gc, x, y, w, h);
+		if (w < lpad)
+			return x + w;
 		d = XftDrawCreate(drw->dpy, drw->drawable,
 		                  DefaultVisual(drw->dpy, drw->screen),
 		                  DefaultColormap(drw->dpy, drw->screen));
@@ -273,12 +283,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 	usedfont = drw->fonts;
 	if (!ellipsis_width && render)
 		ellipsis_width = drw_fontset_getwidth(drw, "...");
+	if (!invalid_width && render)
+		invalid_width = drw_fontset_getwidth(drw, invalid);
 	while (1) {
-		ew = ellipsis_len = utf8strlen = 0;
+		ew = ellipsis_len = utf8err = utf8charlen = utf8strlen = 0;
 		utf8str = text;
 		nextfont = NULL;
 		while (*text) {
-			utf8charlen = utf8decode(text, &utf8codepoint, UTF_SIZ);
+			utf8charlen = utf8decode(text, &utf8codepoint, &utf8err);
 			for (curfont = drw->fonts; curfont; curfont = curfont->next) {
 				charexists = charexists || XftCharExists(drw->dpy, curfont->xfont, utf8codepoint);
 				if (charexists) {
@@ -300,9 +312,9 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 						else
 							utf8strlen = ellipsis_len;
 					} else if (curfont == usedfont) {
-						utf8strlen += utf8charlen;
 						text += utf8charlen;
-						ew += tmpw;
+						utf8strlen += utf8err ? 0 : utf8charlen;
+						ew += utf8err ? 0 : tmpw;
 					} else {
 						nextfont = curfont;
 					}
@@ -310,7 +322,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 				}
 			}
 
-			if (overflow || !charexists || nextfont)
+			if (overflow || !charexists || nextfont || utf8err)
 				break;
 			else
 				charexists = 0;
@@ -325,6 +337,12 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 			x += ew;
 			w -= ew;
 		}
+		if (utf8err && (!render || invalid_width < w)) {
+			if (render)
+				drw_text(drw, x, y, w, h, 0, invalid, invert);
+			x += invalid_width;
+			w -= invalid_width;
+		}
 		if (render && overflow)
 			drw_text(drw, ellipsis_x, y, ellipsis_w, h, 0, "...", invert);
 
@@ -338,11 +356,14 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 			 * character must be drawn. */
 			charexists = 1;
 
-			for (i = 0; i < nomatches_len; ++i) {
-				/* avoid calling XftFontMatch if we know we won't find a match */
-				if (utf8codepoint == nomatches.codepoint[i])
-					goto no_match;
-			}
+			hash = (unsigned int)utf8codepoint;
+			hash = ((hash >> 16) ^ hash) * 0x21F0AAAD;
+			hash = ((hash >> 15) ^ hash) * 0xD35A2D97;
+			h0 = ((hash >> 15) ^ hash) % LENGTH(nomatches);
+			h1 = (hash >> 17) % LENGTH(nomatches);
+			/* avoid expensive XftFontMatch call when we know we won't find a match */
+			if (nomatches[h0] == utf8codepoint || nomatches[h1] == utf8codepoint)
+				goto no_match;
 
 			fccharset = FcCharSetCreate();
 			FcCharSetAddChar(fccharset, utf8codepoint);
@@ -371,7 +392,7 @@ drw_text(Drw *drw, int x, int y, unsigned int w, unsigned int h, unsigned int lp
 					curfont->next = usedfont;
 				} else {
 					xfont_free(usedfont);
-					nomatches.codepoint[++nomatches.idx % nomatches_len] = utf8codepoint;
+					nomatches[nomatches[h0] ? h1 : h0] = utf8codepoint;
 no_match:
 					usedfont = drw->fonts;
 				}

drw.h

@@ -40,7 +40,9 @@ void drw_font_getexts(Fnt *font, const char *text, unsigned int len, unsigned in
 
 /* Colorscheme abstraction */
 void drw_clr_create(Drw *drw, Clr *dest, const char *clrname);
+void drw_clr_free(Drw *drw, Clr *c);
 Clr *drw_scm_create(Drw *drw, const char *clrnames[], size_t clrcount);
+void drw_scm_free(Drw *drw, Clr *scm, size_t clrcount);
 
 /* Cursor abstraction */
 Cur *drw_cur_create(Drw *drw, int shape);

dwm.1

@@ -108,11 +108,11 @@ Decrease size of master area.
 Increase size of master area.
 
 .TP
-.B Mod\-Control\-.
+.B Mod\-[
 Decrease number of master clients.
 
 .TP
-.B Mod\-Control\-,
+.B Mod\-]
 Increase number of master clients.
 
 .TP

dwm.c

@@ -50,8 +50,7 @@
 #define INTERSECT(x,y,w,h,m)    (MAX(0, MIN((x)+(w),(m)->wx+(m)->ww) - MAX((x),(m)->wx)) \
                                * MAX(0, MIN((y)+(h),(m)->wy+(m)->wh) - MAX((y),(m)->wy)))
 #define ISVISIBLEONTAG(C, T)    ((C->tags & T))
-#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]) || C->issticky)
-#define LENGTH(X)               (sizeof X / sizeof X[0])
+#define ISVISIBLE(C)            ((C->tags & C->mon->tagset[C->mon->seltags]))
 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
 #define WIDTH(X)                ((X)->w + 2 * (X)->bw)
 #define HEIGHT(X)               ((X)->h + 2 * (X)->bw)
@@ -539,7 +538,7 @@ cleanup(void)
 	for (i = 0; i < CurLast; i++)
 		drw_cur_free(drw, cursor[i]);
 	for (i = 0; i < LENGTH(colors); i++)
-		free(scheme[i]);
+		drw_scm_free(drw, scheme[i], 3);
 	free(scheme);
 	XDestroyWindow(dpy, wmcheckwin);
 	drw_free(drw);
@@ -996,14 +995,15 @@ focusstack(const Arg *arg)
 Atom
 getatomprop(Client *c, Atom prop)
 {
-	int di;
-	unsigned long dl;
+	int format;
+	unsigned long nitems, dl;
 	unsigned char *p = NULL;
 	Atom da, atom = None;
 
 	if (XGetWindowProperty(dpy, c->win, prop, 0L, sizeof atom, False, XA_ATOM,
-		&da, &di, &dl, &dl, &p) == Success && p) {
-		atom = *(Atom *)p;
+		&da, &format, &nitems, &dl, &p) == Success && p) {
+		if (nitems > 0 && format == 32)
+			atom = *(long *)p;
 		XFree(p);
 	}
 	return atom;
@@ -1029,10 +1029,10 @@ getstate(Window w)
 	Atom real;
 
 	if (XGetWindowProperty(dpy, w, wmatom[WMState], 0L, 2L, False, wmatom[WMState],
-		&real, &format, &n, &extra, (unsigned char **)&p) != Success)
+		&real, &format, &n, &extra, &p) != Success)
 		return -1;
-	if (n != 0)
-		result = *p;
+	if (n != 0 && format == 32)
+		result = *(long *)p;
 	XFree(p);
 	return result;
 }
@@ -1316,7 +1316,7 @@ movemouse(const Arg *arg)
 			handler[ev.type](&ev);
 			break;
 		case MotionNotify:
-			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
+			if ((ev.xmotion.time - lasttime) <= (1000 / refreshrate))
 				continue;
 			lasttime = ev.xmotion.time;
 
@@ -1556,7 +1556,7 @@ resizemouse(const Arg *arg)
 			handler[ev.type](&ev);
 			break;
 		case MotionNotify:
-			if ((ev.xmotion.time - lasttime) <= (1000 / 60))
+			if ((ev.xmotion.time - lasttime) <= (1000 / refreshrate))
 				continue;
 			lasttime = ev.xmotion.time;
 
@@ -1700,12 +1700,10 @@ sendevent(Client *c, Atom proto)
 void
 setfocus(Client *c)
 {
-	if (!c->neverfocus) {
+	if (!c->neverfocus)
 		XSetInputFocus(dpy, c->win, RevertToPointerRoot, CurrentTime);
-		XChangeProperty(dpy, root, netatom[NetActiveWindow],
-			XA_WINDOW, 32, PropModeReplace,
-			(unsigned char *) &(c->win), 1);
-	}
+	XChangeProperty(dpy, root, netatom[NetActiveWindow], XA_WINDOW, 32,
+		PropModeReplace, (unsigned char *)&c->win, 1);
 	sendevent(c, wmatom[WMTakeFocus]);
 }
 
@@ -2163,7 +2161,7 @@ updatebarpos(Monitor *m)
 }
 
 void
-updateclientlist()
+updateclientlist(void)
 {
 	Client *c;
 	Monitor *m;

util.c

@@ -1,4 +1,5 @@
 /* See LICENSE file for copyright and license details. */
+#include <errno.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -10,17 +11,17 @@ void
 die(const char *fmt, ...)
 {
 	va_list ap;
+	int saved_errno;
+
+	saved_errno = errno;
 
 	va_start(ap, fmt);
 	vfprintf(stderr, fmt, ap);
 	va_end(ap);
 
-	if (fmt[0] && fmt[strlen(fmt)-1] == ':') {
-		fputc(' ', stderr);
-		perror(NULL);
-	} else {
-		fputc('\n', stderr);
-	}
+	if (fmt[0] && fmt[strlen(fmt)-1] == ':')
+		fprintf(stderr, " %s", strerror(saved_errno));
+	fputc('\n', stderr);
 
 	exit(1);
 }

util.h

@@ -3,6 +3,7 @@
 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
 #define BETWEEN(X, A, B)        ((A) <= (X) && (X) <= (B))
+#define LENGTH(X)               (sizeof (X) / sizeof (X)[0])
 
 void die(const char *fmt, ...);
 void *ecalloc(size_t nmemb, size_t size);