From c7d8df0fb9971a35acddf15c55992449947d7f50 Mon Sep 17 00:00:00 2001
From: kougyokugentou <41278462+kougyokugentou@users.noreply.github.com>
Date: Sun, 24 Oct 2021 16:13:48 -0700
Subject: [PATCH] A header file to allocate some memory (2006)

---
 demos/alloc_perm.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 demos/alloc_perm.h

diff --git a/demos/alloc_perm.h b/demos/alloc_perm.h
new file mode 100644
index 0000000..0553333
--- /dev/null
+++ b/demos/alloc_perm.h
@@ -0,0 +1,38 @@
+#define MAX_PERM_BLOCK  131072
+
+/*
+ * Allocate some permanent memory.
+ * Permanent memory is never freed,
+ *   pointers into it may be copied safely.
+ */
+void *alloc_perm( int sMem )
+{
+    static char *pMemPerm;
+    static int iMemPerm;
+    void *pMem;
+
+    while ( sMem % sizeof(long) != 0 )
+	sMem++;
+    if ( sMem > MAX_PERM_BLOCK )
+    {
+	printf("\n\rAlloc_perm: %d too large.", sMem );
+	exit( 1 );
+    }
+
+    if ( pMemPerm == NULL || iMemPerm + sMem > MAX_PERM_BLOCK )
+    {
+	iMemPerm = 0;
+	if ( ( pMemPerm = calloc( 1, MAX_PERM_BLOCK ) ) == NULL )
+	{
+	    perror( "Alloc_perm" );
+	    exit( 1 );
+	}
+    }
+
+    pMem        = pMemPerm + iMemPerm;
+    iMemPerm   += sMem;
+//    nAllocPerm += 1;
+//    sAllocPerm += sMem;
+    return pMem;
+}
+