Port of Simon Tatham's Puzzle Collection

Original revision: 5123b1bf68777ffa86e651f178046b26a87cf2d9

MIT Licensed. Some games still crash and others are unplayable due to
issues with controls. Still need a "real" polygon filling algorithm.

Currently builds one plugin per puzzle (about 40 in total, around 100K
each on ARM), but can easily be made to build a single monolithic
overlay (800K or so on ARM).

The following games are at least partially broken for various reasons,
and have been disabled on this commit:

Cube:     failed assertion with "Icosahedron" setting
Keen:     input issues
Mines:    weird stuff happens on target
Palisade: input issues
Solo:     input issues, occasional crash on target
Towers:   input issues
Undead:   input issues
Unequal:  input and drawing issues (concave polys)
Untangle: input issues

Features left to do:
 - In-game help system
 - Figure out the weird bugs

Change-Id: I7c69b6860ab115f973c8d76799502e9bb3d52368

apps/plugins/puzzles/malloc.c

@@ -0,0 +1,61 @@
+/*
+ * malloc.c: safe wrappers around malloc, realloc, free, strdup
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "puzzles.h"
+
+/*
+ * smalloc should guarantee to return a useful pointer - Halibut
+ * can do nothing except die when it's out of memory anyway.
+ */
+
+int allocs = 0;
+int frees = 0;
+
+void *smalloc(size_t size) {
+    void *p;
+    p = malloc(size);
+    LOGF("allocs: %d", ++allocs);
+    if (!p)
+	fatal("out of memory");
+    return p;
+}
+
+/*
+ * sfree should guaranteeably deal gracefully with freeing NULL
+ */
+void sfree(void *p) {
+    if (p) {
+        ++frees;
+        LOGF("frees: %d, total outstanding: %d", frees, allocs - frees);
+	free(p);
+    }
+}
+
+/*
+ * srealloc should guaranteeably be able to realloc NULL
+ */
+void *srealloc(void *p, size_t size) {
+    void *q;
+    if (p) {
+	q = realloc(p, size);
+    } else {
+        LOGF("allocs: %d", ++allocs);
+	q = malloc(size);
+    }
+    if (!q)
+	fatal("out of memory");
+    return q;
+}
+
+/*
+ * dupstr is like strdup, but with the never-return-NULL property
+ * of smalloc (and also reliably defined in all environments :-)
+ */
+char *dupstr(const char *s) {
+    char *r = smalloc(1+strlen(s));
+    strcpy(r,s);
+    return r;
+}