main/zsh: fix segfault when using zle-line-init in .zshrc

http://bugs.alpinelinux.org/issues/5699

The patch is backported from upstream.

main/zsh/APKBUILD

@@ -11,7 +11,8 @@ depends=""
 makedepends="ncurses-dev"
 install="zsh.post-install zsh.post-upgrade zsh.pre-deinstall"
 source="http://www.zsh.org/pub/$pkgname-$pkgver.tar.xz
-	zprofile"
+	zprofile
+	fix-zle-segfault.patch"
 subpackages="$pkgname-doc"
 builddir="$srcdir/$pkgname-$pkgver"
 
@@ -50,8 +51,11 @@ package() {
 }
 
 md5sums="afe96fde08b70e23c1cab1ca7a68fb34  zsh-5.2.tar.xz
-a5e93cd6880da04a63fc4fcaaa03987f  zprofile"
+a5e93cd6880da04a63fc4fcaaa03987f  zprofile
+1413688affa980b053dd2cdc784f8626  fix-zle-segfault.patch"
 sha256sums="f17916320ffaa844bbd7ce48ceeb5945fc5f3eff64b149b4229bbfbdf3795a9d  zsh-5.2.tar.xz
-e3c3625d966c8277274798f26241857df5fc520e18674deba6cc356f6b022d63  zprofile"
+e3c3625d966c8277274798f26241857df5fc520e18674deba6cc356f6b022d63  zprofile
+7b8bfec6f7c0df6954eb27a000ff1d077e37a1ec9fd9f37c247a53922cf0c9be  fix-zle-segfault.patch"
 sha512sums="9938af95e09203a0a313f441e0c23279136806f6f087475ca9a66c678c57ecffc87f73ece8133a36700af8de7cb5d1bec8559eabdec2b66102062e64026c2e72  zsh-5.2.tar.xz
-59182b99447872ded8adf0d890e9359ee47fce0b7acb2808f4308f945885fbf6d977a0917bbb5c0f21454caf3ba06ab092127732da4f84292d6ab0989a0110fe  zprofile"
+59182b99447872ded8adf0d890e9359ee47fce0b7acb2808f4308f945885fbf6d977a0917bbb5c0f21454caf3ba06ab092127732da4f84292d6ab0989a0110fe  zprofile
+f17016b4cb95932caabdfca273696f4a444f1e45c8e7d458db54ae12542fce87bdd6fc6c4cd070948041f50760389179c69c12296665b7b9651007faafbdbee7  fix-zle-segfault.patch"

main/zsh/fix-zle-segfault.patch

+From 0c2d823a7955981e88f7cb5b718a7081d97104f0 Mon Sep 17 00:00:00 2001
+From: Peter Stephenson <pws@zsh.org>
+Date: Mon, 7 Dec 2015 14:32:52 +0000
+Subject: [PATCH] 37337: Delay freeing widget until not in use.
+---
+Alpine notes:
+Fixes http://bugs.alpinelinux.org/issues/5699
+---
+index 2d672de..e9b1428 100644
+--- a/Src/Zle/zle.h
++++ b/Src/Zle/zle.h
+@@ -213,6 +213,8 @@ struct widget {
+ #define ZLE_KEEPSUFFIX	(1<<9)	/* DON'T remove added suffix */
+ #define ZLE_NOTCOMMAND  (1<<10)	/* widget should not alter lastcmd */
+ #define ZLE_ISCOMP      (1<<11)	/* usable for new style completion */
++#define WIDGET_INUSE    (1<<12) /* widget is in use */
++#define WIDGET_FREE     (1<<13) /* request to free when no longer in use */
+ 
+ /* thingies */
+ 
+index 38427e8..1f0c07d 100644
+--- a/Src/Zle/zle_main.c
++++ b/Src/Zle/zle_main.c
+@@ -1344,6 +1344,8 @@ execzlefunc(Thingy func, char **args, int set_bindk)
+ 	    eofsent = 1;
+ 	    ret = 1;
+ 	} else {
++	    int inuse = wflags & WIDGET_INUSE;
++	    w->flags |= WIDGET_INUSE;
+ 	    if(!(wflags & ZLE_KEEPSUFFIX))
+ 		removesuffix();
+ 	    if(!(wflags & ZLE_MENUCMP)) {
+@@ -1367,6 +1369,12 @@ execzlefunc(Thingy func, char **args, int set_bindk)
+ 		ret = w->u.fn(args);
+ 		unqueue_signals();
+ 	    }
++	    if (!inuse) {
++		if (w->flags & WIDGET_FREE)
++		    freewidget(w);
++		else
++		    w->flags &= ~WIDGET_INUSE;
++	    }
+ 	    if (!(wflags & ZLE_NOTCOMMAND))
+ 		lastcmd = wflags;
+ 	}
+@@ -1387,6 +1395,8 @@ execzlefunc(Thingy func, char **args, int set_bindk)
+ 	    int osc = sfcontext, osi = movefd(0);
+ 	    int oxt = isset(XTRACE);
+ 	    LinkList largs = NULL;
++	    int inuse = w->flags & WIDGET_INUSE;
++	    w->flags |= WIDGET_INUSE;
+ 
+ 	    if (*args) {
+ 		largs = newlinklist();
+@@ -1402,8 +1412,15 @@ execzlefunc(Thingy func, char **args, int set_bindk)
+ 	    opts[XTRACE] = oxt;
+ 	    sfcontext = osc;
+ 	    endparamscope();
+-	    lastcmd = w->flags;
+-	    w->flags = 0;
++	    lastcmd = w->flags & ~(WIDGET_INUSE|WIDGET_FREE);
++	    if (inuse) {
++		w->flags &= WIDGET_INUSE|WIDGET_FREE;
++	    } else {
++		if (w->flags & WIDGET_FREE)
++		    freewidget(w);
++		else
++		    w->flags = 0;
++	    }
+ 	    r = 1;
+ 	    redup(osi, 0);
+ 	}
+index 271fd8e..21495b6 100644
+--- a/Src/Zle/zle_thingy.c
++++ b/Src/Zle/zle_thingy.c
+@@ -253,9 +253,14 @@ unbindwidget(Thingy t, int override)
+ /* Free a widget. */
+ 
+ /**/
+-static void
++void
+ freewidget(Widget w)
+ {
++    if (w->flags & WIDGET_INUSE) {
++	w->flags |= WIDGET_FREE;
++	return;
++    }
++
+     if (w->flags & WIDGET_NCOMP) {
+ 	zsfree(w->u.comp.wid);
+ 	zsfree(w->u.comp.func);
+-- 
+2.10.0
+