On 01/29/2011 11:26 PM, Rob wrote:
>> gdb gives me this output:
>>
>> Program terminated with signal 11, Segmentation fault.
>> #0  0x0804b157 in arrangemon (m=0x9280688) at dwm.c:382
>> 382             strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof 
>> m->ltsymbol);
>>
> 
> Can you give details of the variables? (print m->lt)
> Continue this off-list if you want.
> 
> 

Today I had some time to dig in the problem. With the unpatched dwm
version everything works, but I've the flextile-patch applied.

In this patch are some initialisations (in the function createmon())
missing. I've fixed the issue and attached a corrected version of the patch.

@joten: If you agree with the patch, I would update the one on suckless.org.

@Rob: thanks for your support.
diff -up ../dwm-5.8.2-0/config.def.h ./config.def.h
--- ../dwm-5.8.2-0/config.def.h 2010-06-10 22:47:51.660949000 +0200
+++ ./config.def.h      2010-06-10 22:55:53.094322000 +0200
@@ -16,6 +16,9 @@ static const Bool topbar            = Tr
 /* tagging */
 static const char *tags[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
 
+/* include(s) depending on the tags array */
+#include "flextile.h"
+
 static const Rule rules[] = {
        /* class      instance    title       tags mask     isfloating   
monitor */
        { "Gimp",     NULL,       NULL,       0,            True,        -1 },
@@ -25,6 +28,11 @@ static const Rule rules[] = {
 /* layout(s) */
 static const float mfact      = 0.55; /* factor of master area size 
[0.05..0.95] */
 static const Bool resizehints = True; /* True means respect size hints in 
tiled resizals */
+static const int layoutaxis[] = {
+       1,    /* layout axis: 1 = x, 2 = y; negative values mirror the layout, 
setting the master area to the right / bottom instead of left / top */
+       2,    /* master axis: 1 = x (from left to right), 2 = y (from top to 
bottom), 3 = z (monocle) */
+       2,    /* stack axis:  1 = x (from left to right), 2 = y (from top to 
bottom), 3 = z (monocle) */
+};
 
 static const Layout layouts[] = {
        /* symbol     arrange function */
@@ -81,6 +89,12 @@ static Key keys[] = {
        TAGKEYS(                        XK_8,                      7)
        TAGKEYS(                        XK_9,                      8)
        { MODKEY|ShiftMask,             XK_q,      quit,           {0} },
+       { MODKEY|ControlMask,           XK_t,      rotatelayoutaxis, {.i = 0} 
},    /* 0 = layout axis */
+       { MODKEY|ControlMask,           XK_Tab,    rotatelayoutaxis, {.i = 1} 
},    /* 1 = master axis */
+       { MODKEY|ControlMask|ShiftMask, XK_Tab,    rotatelayoutaxis, {.i = 2} 
},    /* 2 = stack axis */
+       { MODKEY|ControlMask,           XK_Return, mirrorlayout,     {0} },
+       { MODKEY|ControlMask,           XK_h,      shiftmastersplit, {.i = -1} 
},   /* reduce the number of tiled clients in the master area */
+       { MODKEY|ControlMask,           XK_l,      shiftmastersplit, {.i = +1} 
},   /* increase the number of tiled clients in the master area */
 };
 
 /* button definitions */
diff -up ../dwm-5.8.2-0/dwm.c ./dwm.c
--- ../dwm-5.8.2-0/dwm.c        2010-06-10 22:47:51.669677000 +0200
+++ ./dwm.c     2010-06-10 22:55:53.128305000 +0200
@@ -122,26 +122,6 @@ typedef struct {
        void (*arrange)(Monitor *);
 } Layout;
 
-struct Monitor {
-       char ltsymbol[16];
-       float mfact;
-       int num;
-       int by;               /* bar geometry */
-       int mx, my, mw, mh;   /* screen size */
-       int wx, wy, ww, wh;   /* window area  */
-       unsigned int seltags;
-       unsigned int sellt;
-       unsigned int tagset[2];
-       Bool showbar;
-       Bool topbar;
-       Client *clients;
-       Client *sel;
-       Client *stack;
-       Monitor *next;
-       Window barwin;
-       const Layout *lt[2];
-};
-
 typedef struct {
        const char *class;
        const char *instance;
@@ -610,6 +590,7 @@ configurerequest(XEvent *e) {
 
 Monitor *
 createmon(void) {
+  unsigned int i;
        Monitor *m;
 
        if(!(m = (Monitor *)calloc(1, sizeof(Monitor))))
@@ -621,6 +602,21 @@ createmon(void) {
        m->lt[0] = &layouts[0];
        m->lt[1] = &layouts[1 % LENGTH(layouts)];
        strncpy(m->ltsymbol, layouts[0].symbol, sizeof m->ltsymbol);
+       m->ltaxis[0] = layoutaxis[0];
+       m->ltaxis[1] = layoutaxis[1];
+       m->ltaxis[2] = layoutaxis[2];
+       m->msplit = 1;
+       /* init tags, bars, layouts, axes, msplits and mfacts */
+  m->curtag = m->prevtag = 1;
+  for(i = 0; i < LENGTH(tags) + 1; i++){
+    m->showbars[i] = m->showbar;
+    m->lts[i] = &layouts[0];
+    m->mfacts[i] = m->mfact;
+    m->ltaxes[i][0] = m->ltaxis[0];
+    m->ltaxes[i][1] = m->ltaxis[1];
+    m->ltaxes[i][2] = m->ltaxis[2];
+    m->msplits[i] = m->msplit;
+  }
        return m;
 }
 
@@ -1494,7 +1490,7 @@ setlayout(const Arg *arg) {
        if(!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
                selmon->sellt ^= 1;
        if(arg && arg->v)
-               selmon->lt[selmon->sellt] = (Layout *)arg->v;
+               selmon->lt[selmon->sellt] = selmon->lts[selmon->curtag] = 
(Layout *)arg->v;
        strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, sizeof 
selmon->ltsymbol);
        if(selmon->sel)
                arrange(selmon);
@@ -1512,14 +1508,14 @@ setmfact(const Arg *arg) {
        f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
        if(f < 0.1 || f > 0.9)
                return;
-       selmon->mfact = f;
+       selmon->mfact = selmon->mfacts[selmon->curtag] = f;
        arrange(selmon);
 }
 
 void
 setup(void) {
        XSetWindowAttributes wa;
-
+ 
        /* clean up any zombies immediately */
        sigchld(0);
 
@@ -1555,7 +1551,6 @@ setup(void) {
        XSetLineAttributes(dpy, dc.gc, 1, LineSolid, CapButt, JoinMiter);
        if(!dc.font.set)
                XSetFont(dpy, dc.gc, dc.font.xfont->fid);
-       /* init bars */
        updatebars();
        updatestatus();
        /* EWMH support per view */
@@ -1635,38 +1631,8 @@ textnw(const char *text, unsigned int le
 }
 
 void
-tile(Monitor *m) {
-       int x, y, h, w, mw;
-       unsigned int i, n;
-       Client *c;
-
-       for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
-       if(n == 0)
-               return;
-       /* master */
-       c = nexttiled(m->clients);
-       mw = m->mfact * m->ww;
-       resize(c, m->wx, m->wy, (n == 1 ? m->ww : mw) - 2 * c->bw, m->wh - 2 * 
c->bw, False);
-       if(--n == 0)
-               return;
-       /* tile stack */
-       x = (m->wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : m->wx + mw;
-       y = m->wy;
-       w = (m->wx + mw > c->x + c->w) ? m->wx + m->ww - x : m->ww - mw;
-       h = m->wh / n;
-       if(h < bh)
-               h = m->wh;
-       for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
-               resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
-                      ? m->wy + m->wh - y - 2 * c->bw : h - 2 * c->bw), False);
-               if(h != m->wh)
-                       y = c->y + HEIGHT(c);
-       }
-}
-
-void
 togglebar(const Arg *arg) {
-       selmon->showbar = !selmon->showbar;
+       selmon->showbar = selmon->showbars[selmon->curtag] = !selmon->showbar;
        updatebarpos(selmon);
        XMoveResizeWindow(dpy, selmon->barwin, selmon->wx, selmon->by, 
selmon->ww, bh);
        arrange(selmon);
@@ -1686,12 +1652,31 @@ togglefloating(const Arg *arg) {
 void
 toggletag(const Arg *arg) {
        unsigned int newtags;
+       unsigned int i;
 
        if(!selmon->sel)
                return;
        newtags = selmon->sel->tags ^ (arg->ui & TAGMASK);
        if(newtags) {
                selmon->sel->tags = newtags;
+               if(newtags == ~0) {
+                       selmon->prevtag = selmon->curtag;
+                       selmon->curtag = 0;
+               }
+               if(!(newtags & 1 << (selmon->curtag - 1))) {
+                       selmon->prevtag = selmon->curtag;
+                       for (i=0; !(newtags & 1 << i); i++);
+                       selmon->curtag = i + 1;
+               }
+               selmon->sel->tags = newtags;
+               selmon->lt[selmon->sellt] = selmon->lts[selmon->curtag];
+               selmon->mfact = selmon->mfacts[selmon->curtag];
+               if (selmon->showbar != selmon->showbars[selmon->curtag])
+                       togglebar(NULL);
+               selmon->ltaxis[0] = selmon->ltaxes[selmon->curtag][0];
+               selmon->ltaxis[1] = selmon->ltaxes[selmon->curtag][1];
+               selmon->ltaxis[2] = selmon->ltaxes[selmon->curtag][2];
+               selmon->msplit = selmon->msplits[selmon->curtag];
                arrange(selmon);
        }
 }
@@ -1959,11 +1944,33 @@ updatewmhints(Client *c) {
 
 void
 view(const Arg *arg) {
+       unsigned int i;
+
        if((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
                return;
        selmon->seltags ^= 1; /* toggle sel tagset */
-       if(arg->ui & TAGMASK)
+       if(arg->ui & TAGMASK) {
                selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
+               selmon->prevtag = selmon->curtag;
+               if(arg->ui == ~0)
+                       selmon->curtag = 0;
+               else {
+                       for (i=0; !(arg->ui & 1 << i); i++);
+                       selmon->curtag = i + 1;
+               }
+       } else {
+               selmon->prevtag = selmon->curtag ^ selmon->prevtag;
+               selmon->curtag ^= selmon->prevtag;
+               selmon->prevtag = selmon->curtag ^ selmon->prevtag;
+       }
+       selmon->lt[selmon->sellt] = selmon->lts[selmon->curtag];
+       selmon->mfact = selmon->mfacts[selmon->curtag];
+       if(selmon->showbar != selmon->showbars[selmon->curtag])
+               togglebar(NULL);
+       selmon->ltaxis[0] = selmon->ltaxes[selmon->curtag][0];
+       selmon->ltaxis[1] = selmon->ltaxes[selmon->curtag][1];
+       selmon->ltaxis[2] = selmon->ltaxes[selmon->curtag][2];
+       selmon->msplit = selmon->msplits[selmon->curtag];
        arrange(selmon);
 }
 
 
diff -up ../dwm-5.8.2-0/flextile.h ./flextile.h
--- ../dwm-5.8.2-0/flextile.h   2010-06-10 23:08:24.000000000 +0200
+++ ./flextile.h        2010-06-10 22:59:20.632706000 +0200
@@ -0,0 +1,159 @@
+/* See LICENSE file for copyright and license details. */
+/* © 2010 joten <jo...@freenet.de> */
+
+struct Monitor {
+       char ltsymbol[16];
+       float mfact;
+       double mfacts[LENGTH(tags) + 1];
+       int ltaxis[3];
+       int ltaxes[LENGTH(tags) + 1][3];
+       int num;
+       int curtag;
+       int prevtag;
+       int by;               /* bar geometry */
+       int mx, my, mw, mh;   /* screen size */
+       int wx, wy, ww, wh;   /* window area  */
+       unsigned int msplit;
+       unsigned int msplits[LENGTH(tags) + 1];
+       unsigned int seltags;
+       unsigned int sellt;
+       unsigned int tagset[2];
+       Bool showbar;
+       Bool showbars[LENGTH(tags) + 1];
+       Bool topbar;
+       Client *clients;
+       Client *sel;
+       Client *stack;
+       Monitor *next;
+       Window barwin;
+       const Layout *lt[2];
+       const Layout *lts[LENGTH(tags) + 1];
+};
+
+/* function declarations */
+static void mirrorlayout(const Arg *arg);
+static void rotatelayoutaxis(const Arg *arg);
+static void shiftmastersplit(const Arg *arg);
+
+void
+mirrorlayout(const Arg *arg) {
+       if(!selmon->lt[selmon->sellt]->arrange)
+               return;
+       selmon->ltaxis[0] *= -1;
+       selmon->ltaxes[selmon->curtag][0] = selmon->ltaxis[0];
+       arrange(selmon);
+}
+
+void
+rotatelayoutaxis(const Arg *arg) {
+       if(!selmon->lt[selmon->sellt]->arrange)
+               return;
+       if(arg->i == 0) {
+               if(selmon->ltaxis[0] > 0)
+                       selmon->ltaxis[0] = selmon->ltaxis[0] + 1 > 2 ? 1 : 
selmon->ltaxis[0] + 1;
+               else
+                       selmon->ltaxis[0] = selmon->ltaxis[0] - 1 < -2 ? -1 : 
selmon->ltaxis[0] - 1;
+       } else
+               selmon->ltaxis[arg->i] = selmon->ltaxis[arg->i] + 1 > 3 ? 1 : 
selmon->ltaxis[arg->i] + 1;
+       selmon->ltaxes[selmon->curtag][arg->i] = selmon->ltaxis[arg->i];
+       arrange(selmon);
+}
+
+void
+shiftmastersplit(const Arg *arg) {
+       unsigned int n;
+       Client *c;
+
+       for(n = 0, c = nexttiled(selmon->clients); c; c = nexttiled(c->next), 
n++);
+       if(!arg || !selmon->lt[selmon->sellt]->arrange || selmon->msplit + 
arg->i < 1 || selmon->msplit + arg->i > n)
+               return;
+       selmon->msplit += arg->i;
+       selmon->msplits[selmon->curtag] = selmon->msplit;
+       arrange(selmon);
+}
+
+void
+tile(Monitor *m) {
+       char sym1 = 61, sym2 = 93, sym3 = 61, sym;
+       int x1 = m->wx, y1 = m->wy, h1 = m->wh, w1 = m->ww, X1 = x1 + w1, Y1 = 
y1 + h1;
+       int x2 = m->wx, y2 = m->wy, h2 = m->wh, w2 = m->ww, X2 = x2 + w2, Y2 = 
y2 + h2;
+       unsigned int i, n, n1, n2;
+       Client *c;
+
+       for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
+       if(m->msplit > n)
+               m->msplit = (n == 0) ? 1 : n;
+       /* layout symbol */
+       if(abs(m->ltaxis[0]) == m->ltaxis[1])    /* explicitly: 
((abs(m->ltaxis[0]) == 1 && m->ltaxis[1] == 1) || (abs(m->ltaxis[0]) == 2 && 
m->ltaxis[1] == 2)) */
+               sym1 = 124;
+       if(abs(m->ltaxis[0]) == m->ltaxis[2])
+               sym3 = 124;
+       if(m->ltaxis[1] == 3)
+               sym1 = (n == 0) ? 0 : m->msplit;
+       if(m->ltaxis[2] == 3)
+               sym3 = (n == 0) ? 0 : n - m->msplit;
+       if(m->ltaxis[0] < 0) {
+               sym = sym1;
+               sym1 = sym3;
+               sym2 = 91;
+               sym3 = sym;
+       }
+       if(m->msplit == 1) {
+               if(m->ltaxis[0] > 0)
+                       sym1 = 91;
+               else
+                       sym3 = 93;
+       }
+       if(m->msplit > 1 && m->ltaxis[1] == 3 && m->ltaxis[2] == 3)
+               snprintf(m->ltsymbol, sizeof m->ltsymbol, "%d%c%d", sym1, sym2, 
sym3);
+       else if((m->msplit > 1 && m->ltaxis[1] == 3 && m->ltaxis[0] > 0) || 
(m->ltaxis[2] == 3 && m->ltaxis[0] < 0))
+               snprintf(m->ltsymbol, sizeof m->ltsymbol, "%d%c%c", sym1, sym2, 
sym3);
+       else if((m->ltaxis[2] == 3 && m->ltaxis[0] > 0) || (m->msplit > 1 && 
m->ltaxis[1] == 3 && m->ltaxis[0] < 0))
+               snprintf(m->ltsymbol, sizeof m->ltsymbol, "%c%c%d", sym1, sym2, 
sym3);
+       else
+               snprintf(m->ltsymbol, sizeof m->ltsymbol, "%c%c%c", sym1, sym2, 
sym3);
+       if(n == 0)
+               return;
+       /* master and stack area */
+       if(abs(m->ltaxis[0]) == 1 && n > m->msplit) {
+               w1 *= m->mfact;
+               w2 -= w1;
+               x1 += (m->ltaxis[0] < 0) ? w2 : 0;
+               x2 += (m->ltaxis[0] < 0) ? 0 : w1;
+               X1 = x1 + w1;
+               X2 = x2 + w2;
+       } else if(abs(m->ltaxis[0]) == 2 && n > m->msplit) {
+               h1 *= m->mfact;
+               h2 -= h1;
+               y1 += (m->ltaxis[0] < 0) ? h2 : 0;
+               y2 += (m->ltaxis[0] < 0) ? 0 : h1;
+               Y1 = y1 + h1;
+               Y2 = y2 + h2;
+       }
+       /* master */
+       n1 = (m->ltaxis[1] != 1 || w1 / m->msplit < bh) ? 1 : m->msplit;
+       n2 = (m->ltaxis[1] != 2 || h1 / m->msplit < bh) ? 1 : m->msplit;
+       for(i = 0, c = nexttiled(m->clients); i < m->msplit; c = 
nexttiled(c->next), i++) {
+               resize(c, x1, y1, 
+                       (m->ltaxis[1] == 1 && i + 1 == m->msplit) ? X1 - x1 - 2 
* c->bw : w1 / n1 - 2 * c->bw, 
+                       (m->ltaxis[1] == 2 && i + 1 == m->msplit) ? Y1 - y1 - 2 
* c->bw : h1 / n2 - 2 * c->bw, False);
+               if(n1 > 1)
+                       x1 = c->x + WIDTH(c);
+               if(n2 > 1)
+                       y1 = c->y + HEIGHT(c);
+       }
+       /* stack */
+       if(n > m->msplit) {
+               n1 = (m->ltaxis[2] != 1 || w2 / (n - m->msplit) < bh) ? 1 : n - 
m->msplit;
+               n2 = (m->ltaxis[2] != 2 || h2 / (n - m->msplit) < bh) ? 1 : n - 
m->msplit;
+               for(i = 0; c; c = nexttiled(c->next), i++) {
+                       resize(c, x2, y2, 
+                               (m->ltaxis[2] == 1 && i + 1 == n - m->msplit) ? 
X2 - x2 - 2 * c->bw : w2 / n1 - 2 * c->bw, 
+                               (m->ltaxis[2] == 2 && i + 1 == n - m->msplit) ? 
Y2 - y2 - 2 * c->bw : h2 / n2 - 2 * c->bw, False);
+                       if(n1 > 1)
+                               x2 = c->x + WIDTH(c);
+                       if(n2 > 1)
+                               y2 = c->y + HEIGHT(c);
+               }
+       }
+}

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