[gnumeric] excelplugins: don't use alloca.

[Morten Welinder <mortenw src gnome org>]

commit 092b689743623b48950e8694ad624492328032f8
Author: Morten Welinder <terra gnome org>
Date:   Thu Nov 30 11:25:56 2017 -0500

    excelplugins: don't use alloca.

 plugins/excelplugins/ChangeLog            |    5 +++++
 plugins/excelplugins/xlcall32_emulation.c |    8 +++++---
 2 files changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/plugins/excelplugins/ChangeLog b/plugins/excelplugins/ChangeLog
index 1f72b82..3410bab 100644
--- a/plugins/excelplugins/ChangeLog
+++ b/plugins/excelplugins/ChangeLog
@@ -1,3 +1,8 @@
+2017-11-30  Morten Welinder  <terra gnome org>
+
+       * xlcall32_emulation.c (Excel4): Avoid alloca to avoid
+       over-allocating on the stack.
+
 2017-11-18  Morten Welinder <terra gnome org>
 
        * Release 1.12.36
diff --git a/plugins/excelplugins/xlcall32_emulation.c b/plugins/excelplugins/xlcall32_emulation.c
index 1d7f34f..46eea64 100644
--- a/plugins/excelplugins/xlcall32_emulation.c
+++ b/plugins/excelplugins/xlcall32_emulation.c
@@ -58,14 +58,16 @@ G_MODULE_EXPORT int far pascal Excel4v(int xlfn, void* operRes, int count, void*
 }
 
 G_MODULE_EXPORT int far _cdecl Excel4(int xlfn, void* operRes, int count, ...) {
-       void **opers=(void**)alloca(count*sizeof(void*));
+       void **opers=g_new(void *, MAX(1,count));
        va_list arg_list;
-       int i;
+       int i, res;
         va_start(arg_list,count);
        for (i=0;i<count;++i)
                opers[i]=va_arg(arg_list,void*);
        va_end(arg_list);
-       return Excel4v(xlfn,operRes,count,(void**)opers);
+       res = Excel4v(xlfn,operRes,count,opers);
+       g_free (opers);
+       return res;
 }
 
 int far pascal XLCallVer(void){