diff -r 92e482410453 -r d345541018fa src/stack.c
--- a/src/stack.c	Mon Dec 30 09:54:10 2019 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,165 +0,0 @@
-/*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
- *
- * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *   1. Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *
- *   2. Redistributions in binary form must reproduce the above copyright
- *      notice, this list of conditions and the following disclaimer in the
- *      documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "ucx/stack.h"
-
-#include <string.h>
-
-static size_t ucx_stack_align(size_t n) {
-    int align = n % sizeof(void*);
-    if (align) {
-        n += sizeof(void*) - align;
-    }
-    return n;
-}
-
-void ucx_stack_init(UcxStack *stack, char* space, size_t size) {
-    stack->size = size - size % sizeof(void*);
-    stack->space = space;
-    stack->top = NULL;
-    
-    stack->allocator.pool = stack;
-    stack->allocator.malloc = (ucx_allocator_malloc) ucx_stack_malloc;
-    stack->allocator.calloc = (ucx_allocator_calloc) ucx_stack_calloc;
-    stack->allocator.realloc = (ucx_allocator_realloc) ucx_stack_realloc;
-    stack->allocator.free = (ucx_allocator_free) ucx_stack_free;
-}
-
-void *ucx_stack_malloc(UcxStack *stack, size_t n) {
-
-    if (ucx_stack_avail(stack) < ucx_stack_align(n)) {
-        return NULL;
-    } else {
-        char *prev = stack->top;
-        if (stack->top) {
-            stack->top += ucx_stack_align(ucx_stack_topsize(stack));
-        } else {
-            stack->top = stack->space;
-        }
-        
-        ((struct ucx_stack_metadata*)stack->top)->prev = prev;
-        ((struct ucx_stack_metadata*)stack->top)->size = n;
-        stack->top += sizeof(struct ucx_stack_metadata);
-        
-        return stack->top;
-    }
-}
-
-void *ucx_stack_calloc(UcxStack *stack, size_t nelem, size_t elsize) {
-    void *mem = ucx_stack_malloc(stack, nelem*elsize);
-    memset(mem, 0, nelem*elsize);
-    return mem;
-}
-
-void *ucx_stack_realloc(UcxStack *stack, void *ptr, size_t n) {
-    if (ptr == stack->top) {
-        if (stack->size - (stack->top - stack->space) < ucx_stack_align(n)) {
-            return NULL;
-        } else {
-            ((struct ucx_stack_metadata*)stack->top - 1)->size = n;
-            return ptr;
-        }
-    } else {
-        if (ucx_stack_align(((struct ucx_stack_metadata*)ptr - 1)->size) <
-                ucx_stack_align(n)) {
-            void *nptr = ucx_stack_malloc(stack, n);
-            if (nptr) {
-                memcpy(nptr, ptr, n);
-                ucx_stack_free(stack, ptr);
-                
-                return nptr;
-            } else {
-                return NULL;
-            }
-        } else {
-            ((struct ucx_stack_metadata*)ptr - 1)->size = n;
-            return ptr;
-        }
-    }
-}
-
-void ucx_stack_free(UcxStack *stack, void *ptr) {
-    if (ptr == stack->top) {
-        stack->top = ((struct ucx_stack_metadata*) stack->top - 1)->prev;
-    } else {
-        struct ucx_stack_metadata *next = (struct ucx_stack_metadata*)(
-            (char*)ptr +
-            ucx_stack_align(((struct ucx_stack_metadata*) ptr - 1)->size)
-        );
-        next->prev = ((struct ucx_stack_metadata*) ptr - 1)->prev;
-    }
-}
-
-void ucx_stack_popn(UcxStack *stack, void *dest, size_t n) {
-    if (ucx_stack_empty(stack)) {
-        return;
-    }
-    
-    if (dest) {
-        size_t len = ucx_stack_topsize(stack);
-        if (len > n) {
-            len = n;
-        }
-
-        memcpy(dest, stack->top, len);
-    }
-    
-    ucx_stack_free(stack, stack->top);
-}
-
-size_t ucx_stack_avail(UcxStack *stack) {
-    size_t avail = ((stack->top ? (stack->size
-                    - (stack->top - stack->space)
-                    - ucx_stack_align(ucx_stack_topsize(stack)))
-                    : stack->size));
-    
-    if (avail > sizeof(struct ucx_stack_metadata)) {
-        return avail - sizeof(struct ucx_stack_metadata);
-    } else {
-        return 0;
-    }
-}
-
-void *ucx_stack_push(UcxStack *stack, size_t n, const void *data) {
-    void *space = ucx_stack_malloc(stack, n);
-    if (space) {
-        memcpy(space, data, n);
-    }
-    return space;
-}
-
-void *ucx_stack_pusharr(UcxStack *stack,
-        size_t nelem, size_t elsize, const void *data) {
-    
-    // skip the memset by using malloc
-    void *space = ucx_stack_malloc(stack, nelem*elsize);
-    if (space) {
-        memcpy(space, data, nelem*elsize);
-    }
-    return space;
-}