From b948d9928c6076fda69c46d18fe3a2dbc2c8994f Mon Sep 17 00:00:00 2001
From: Harald Oehlmann <oehhar@sourceforge.net>
Date: Tue, 18 Aug 2015 14:27:37 +0200
Subject: [PATCH] Fixed wrong use of _alloca which causes crashes on Windows

---
 backend/render.c | 42 +++++++++---------------------------------
 1 file changed, 9 insertions(+), 33 deletions(-)

diff --git a/backend/render.c b/backend/render.c
index fd099853..c7434b0d 100644
--- a/backend/render.c
+++ b/backend/render.c
@@ -81,11 +81,7 @@ int render_plot(struct zint_symbol *symbol, float width, float height)
 	int upceanflag = 0;
 
 	// Allocate memory for the rendered version
-#ifndef _MSC_VER
-	render = symbol->rendered = malloc(sizeof(struct zint_render));
-#else
-	render = symbol->rendered = (struct zint_render *)_alloca(sizeof(struct zint_render));
-#endif
+	render = symbol->rendered = (struct zint_render *) malloc(sizeof(struct zint_render));
 	render->lines = NULL;
 	render->strings = NULL;
 	render->rings = NULL;
@@ -101,7 +97,7 @@ int render_plot(struct zint_symbol *symbol, float width, float height)
 	symbol_lead_in = 0;
 	addon_text_posn = 0.0;
 	addon_width_x = 0;
-
+	
   /*
    * Determine if there will be any addon texts and text height 
    */
@@ -474,7 +470,7 @@ int render_plot(struct zint_symbol *symbol, float width, float height)
 			}
 
 		}
-		
+	
 		if(upceanflag == 13) {
 			/* guard bar extensions and text formatting for EAN-13 */
 			i = 0;
@@ -566,7 +562,7 @@ int render_plot(struct zint_symbol *symbol, float width, float height)
 			render_plot_add_string(symbol, (unsigned char *) textpart, (textpos + xoffset) * scaler, default_text_posn, 11.0 * scaler, textwidth * scaler, &last_string);
 			textpart[0] = symbol->text[11];
 			textpart[1] = '\0';
-			textpos = 100;
+		textpos = 100;
 			textwidth = 6.2;
 			render_plot_add_string(symbol, (unsigned char *) textpart, (textpos + xoffset) * scaler, default_text_posn + (2.0 * scaler), 8.0 * scaler, textwidth * scaler, &last_string);
 			textdone = 1;
@@ -686,11 +682,7 @@ struct zint_render_line *render_plot_create_line(float x, float y, float width,
 {
 	struct zint_render_line *line;
 	
-#ifndef _MSC_VER
-	line = malloc(sizeof(struct zint_render_line));
-#else
-	line = (struct zint_render_line *)_alloca(sizeof(struct zint_render_line));
-#endif
+	line = (struct zint_render_line*) malloc(sizeof(struct zint_render_line));
 	line->next = NULL;
 	line->x = x;
 	line->y = y;
@@ -719,11 +711,7 @@ struct zint_render_ring *render_plot_create_ring(float x, float y, float radius,
 {
 	struct zint_render_ring *ring;
 	
-#ifndef _MSC_VER
-	ring = malloc(sizeof(struct zint_render_ring));
-#else
-	ring = (struct zint_render_ring *)_alloca(sizeof(struct zint_render_ring));
-#endif
+	ring = (struct zint_render_ring *) malloc(sizeof(struct zint_render_ring));
 	ring->next = NULL;
 	ring->x = x;
 	ring->y = y;
@@ -748,11 +736,7 @@ struct zint_render_hexagon *render_plot_create_hexagon(float x, float y)
 {
 	struct zint_render_hexagon *hexagon;
 	
-#ifndef _MSC_VER
-	hexagon = malloc(sizeof(struct zint_render_hexagon));
-#else
-	hexagon = (struct zint_render_hexagon *)_alloca(sizeof(struct zint_render_hexagon));
-#endif
+	hexagon = (struct zint_render_hexagon*) malloc(sizeof(struct zint_render_hexagon));
 	hexagon->next = NULL;
 	hexagon->x = x;
 	hexagon->y = y;
@@ -781,22 +765,14 @@ int render_plot_add_string(struct zint_symbol *symbol,
 {
 	struct zint_render_string *string;
 
-#ifndef _MSC_VER
-	string = malloc(sizeof(struct zint_render_string));
-#else
-	string = (struct zint_render_string *)_alloca(sizeof(struct zint_render_string));
-#endif
+	string = (struct zint_render_string*) malloc(sizeof(struct zint_render_string));
 	string->next = NULL;
 	string->x = x;
 	string->y = y;
 	string->width = width; 
 	string->fsize = fsize;
 	string->length = ustrlen(text);
-#ifndef _MSC_VER
-	string->text = malloc(sizeof(unsigned char) * (ustrlen(text) + 1));
-#else
-	string->text = (unsigned char *)_alloca((ustrlen(text) + 1) * sizeof(unsigned char));
-#endif
+	string->text = (unsigned char*) malloc(sizeof(unsigned char) * (ustrlen(text) + 1));
 	ustrcpy(string->text, text);
 
 	if (*last_string)