From 35cfcd0fd74ebce66cd7bf12309b600d37c34623 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Wed, 17 Jul 2019 21:17:31 -0400
Subject: text_render(): Duplicate string

---
diff --git a/src/text.c b/src/text.c
index 695d5aa..cb777e4 100644
--- a/src/text.c
+++ b/src/text.c
@@ -22,6 +22,7 @@
 #include "text.h"
 
 #include <stdlib.h>
+#include <string.h>
 
 #include <png.h>
 
@@ -97,14 +98,20 @@ text_get_height(struct text *text)
 void
 text_render(struct text *text, struct font *font, png_bytepp rows)
 {
-	const char *string;
-	size_t      row;
-	size_t      col;
-	png_color   fg = {255, 255, 255};
-	png_color   bg = {  0,   0,   0};
-
-	string = text->string;
+	char      *string_start;
+	char      *string;
+	size_t     row;
+	size_t     col;
+	png_color  fg = {255, 255, 255};
+	png_color  bg = {  0,   0,   0};
+
+	string_start = calloc(strlen(text->string) + 1, sizeof(*text->string));
+	if (!string_start) {
+		return;
+	}
+	memcpy(string_start, text->string, strlen(text->string) + 1);
 
+	string = string_start;
 	row = 0;
 	col = 0;
 	while (string && *string) {
@@ -131,6 +138,8 @@ text_render(struct text *text, struct font *font, png_bytepp rows)
 	for (; col < text->width; ++col) {
 		font_render(font, &fg, &bg, ' ', rows, row, col);
 	}
+
+	free(string_start);
 }
 
 struct text *
--
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