fixed insert segfault, added nextrune

dmenu.c

@@ -15,7 +15,6 @@
 #define INRECT(x,y,rx,ry,rw,rh) ((x) >= (rx) && (x) < (rx)+(rw) && (y) >= (ry) && (y) < (ry)+(rh))
 #define MIN(a,b)                ((a) < (b) ? (a) : (b))
 #define MAX(a,b)                ((a) > (b) ? (a) : (b))
-#define UTF8_CODEPOINT(c)       (((c) & 0xc0) != 0x80)
 
 typedef struct Item Item;
 struct Item {
@@ -32,7 +31,8 @@ static void grabkeyboard(void);
 static void insert(const char *s, ssize_t n);
 static void keypress(XKeyEvent *ev);
 static void match(void);
-static void paste(Atom atom);
+static size_t nextrune(int incr);
+static void paste(void);
 static void readstdin(void);
 static void run(void);
 static void setup(void);
@@ -52,7 +52,7 @@ static unsigned int lines = 0;
 static unsigned int promptw;
 static unsigned long normcol[ColLast];
 static unsigned long selcol[ColLast];
-static Atom clip, utf8;
+static Atom utf8;
 static Bool topbar = True;
 static DC *dc;
 static Item *items = NULL;
@@ -159,7 +159,9 @@ grabkeyboard(void) {
 
 void
 insert(const char *s, ssize_t n) {
-	memmove(text + cursor + n, text + cursor, sizeof text - cursor - n);
+	if(strlen(text) + n > sizeof text - 1)
+		return;
+	memmove(text + cursor + n, text + cursor, sizeof text - cursor - MAX(n, 0));
 	if(n > 0)
 		memcpy(text + cursor, s, n);
 	cursor += n;
@@ -169,7 +171,6 @@ insert(const char *s, ssize_t n) {
 void
 keypress(XKeyEvent *ev) {
 	char buf[32];
-	int n;
 	size_t len;
 	KeySym ksym;
 
@@ -217,38 +218,31 @@ keypress(XKeyEvent *ev) {
 			ksym = XK_Up;
 			break;
 		case XK_u:  /* delete left */
-			insert(NULL, -cursor);
+			insert(NULL, 0 - cursor);
 			break;
 		case XK_w:  /* delete word */
-			if(cursor == 0)
-				return;
-			n = 0;
-			while(cursor - n++ > 0 && text[cursor - n] == ' ');
-			while(cursor - n++ > 0 && text[cursor - n] != ' ');
-			insert(NULL, 1-n);
+			while(cursor > 0 && text[nextrune(-1)] == ' ')
+				insert(NULL, nextrune(-1) - cursor);
+			while(cursor > 0 && text[nextrune(-1)] != ' ')
+				insert(NULL, nextrune(-1) - cursor);
 			break;
 		case XK_y:  /* paste selection */
-			XConvertSelection(dc->dpy, XA_PRIMARY, utf8, clip, win, CurrentTime);
+			XConvertSelection(dc->dpy, XA_PRIMARY, utf8, utf8, win, CurrentTime);
 			return;
 		}
 	}
 	switch(ksym) {
 	default:
 		if(isprint(*buf))
-			insert(buf, MIN(strlen(buf), sizeof text - cursor));
-		break;
-	case XK_BackSpace:
-		if(cursor == 0)
-			return;
-		for(n = 1; cursor - n > 0 && !UTF8_CODEPOINT(text[cursor - n]); n++);
-		insert(NULL, -n);
+			insert(buf, strlen(buf));
 		break;
 	case XK_Delete:
 		if(cursor == len)
 			return;
-		for(n = 1; cursor + n < len && !UTF8_CODEPOINT(text[cursor + n]); n++);
-		cursor += n;
-		insert(NULL, -n);
+		cursor = nextrune(+1);
+	case XK_BackSpace:
+		if(cursor > 0)
+			insert(NULL, nextrune(-1) - cursor);
 		break;
 	case XK_End:
 		if(cursor < len) {
@@ -274,15 +268,13 @@ keypress(XKeyEvent *ev) {
 		break;
 	case XK_Left:
 		if(cursor > 0 && (!sel || !sel->left || lines > 0)) {
-			while(cursor-- > 0 && !UTF8_CODEPOINT(text[cursor]));
+			cursor = nextrune(-1);
 			break;
 		}
 		else if(lines > 0)
 			return;
 	case XK_Up:
-		if(!sel || !sel->left)
-			return;
-		if((sel = sel->left)->right == curr) {
+		if(sel && sel->left && (sel = sel->left)->right == curr) {
 			curr = prev;
 			calcoffsets();
 		}
@@ -306,15 +298,13 @@ keypress(XKeyEvent *ev) {
 		exit(EXIT_SUCCESS);
 	case XK_Right:
 		if(cursor < len) {
-			while(cursor++ < len && !UTF8_CODEPOINT(text[cursor]));
+			cursor = nextrune(+1);
 			break;
 		}
 		else if(lines > 0)
 			return;
 	case XK_Down:
-		if(!sel || !sel->right)
-			return;
-		if((sel = sel->right) == next) {
+		if(sel && sel->right && (sel = sel->right) == next) {
 			curr = next;
 			calcoffsets();
 		}
@@ -370,14 +360,23 @@ match(void) {
 	calcoffsets();
 }
 
+size_t
+nextrune(int incr) {
+	size_t n, len;
+
+	len = strlen(text);
+	for(n = cursor + incr; n >= 0 && n < len && (text[n] & 0xc0) == 0x80; n += incr);
+	return n;
+}
+
 void
-paste(Atom atom) {
+paste(void) {
 	char *p, *q;
 	int di;
 	unsigned long dl;
 	Atom da;
 
-	XGetWindowProperty(dc->dpy, win, atom, 0, sizeof text - cursor, False,
+	XGetWindowProperty(dc->dpy, win, utf8, 0, (sizeof text / 4) + 1, False,
 	                   utf8, &da, &di, &dl, &dl, (unsigned char **)&p);
 	insert(p, (q = strchr(p, '\n')) ? q-p : strlen(p));
 	XFree(p);
@@ -396,8 +395,8 @@ readstdin(void) {
 			eprintf("cannot malloc %u bytes\n", sizeof *item);
 		if(!(item->text = strdup(buf)))
 			eprintf("cannot strdup %u bytes\n", strlen(buf)+1);
-		inputw = MAX(inputw, textw(dc, item->text));
 		item->next = item->left = item->right = NULL;
+		inputw = MAX(inputw, textw(dc, item->text));
 	}
 }
 
@@ -415,8 +414,8 @@ run(void) {
 			keypress(&ev.xkey);
 			break;
 		case SelectionNotify:
-			if(ev.xselection.property != None)
-				paste(ev.xselection.property);
+			if(ev.xselection.property == utf8)
+				paste();
 			break;
 		case VisibilityNotify:
 			if(ev.xvisibility.state != VisibilityUnobscured)
@@ -437,7 +436,6 @@ setup(void) {
 	screen = DefaultScreen(dc->dpy);
 	root = RootWindow(dc->dpy, screen);
 	utf8 = XInternAtom(dc->dpy, "UTF8_STRING", False);
-	clip = XInternAtom(dc->dpy, "_DMENU_STRING", False);
 
 	normcol[ColBG] = getcolor(dc, normbgcolor);
 	normcol[ColFG] = getcolor(dc, normfgcolor);