Make memory management uniform: _everything_ now goes through the

smalloc() macros and thence to the safemalloc() functions in misc.c.
This should allow me to plug in a debugging allocator and track
memory leaks and segfaults and things.

[originally from svn r818]

puttymem.h

@@ -0,0 +1,24 @@
+/*
+ * PuTTY memory-handling header.
+ */
+
+#ifndef PUTTY_PUTTYMEM_H
+#define PUTTY_PUTTYMEM_H
+
+/* #define MALLOC_LOG  do this if you suspect putty of leaking memory */
+#ifdef MALLOC_LOG
+#define smalloc(z) (mlog(__FILE__,__LINE__), safemalloc(z))
+#define srealloc(y,z) (mlog(__FILE__,__LINE__), saferealloc(y,z))
+#define sfree(z) (mlog(__FILE__,__LINE__), safefree(z))
+void mlog(char *, int);
+#else
+#define smalloc safemalloc
+#define srealloc saferealloc
+#define sfree safefree
+#endif
+
+void *safemalloc(size_t);
+void *saferealloc(void *, size_t);
+void safefree(void *);
+
+#endif