From: Bruno Haible <bruno@clisp.org>
Date: Mon, 17 Jul 2006 11:28:01 +0000 (+0000)
Subject: Sequential list data type implemented by an array.
X-Git-Tag: cvs-readonly~2211
X-Git-Url: http://erislabs.net/gitweb/?a=commitdiff_plain;h=7aa40057cd5a93af7c8ee8b619b20cf0107c4172;p=gnulib.git

Sequential list data type implemented by an array.
---

diff --git a/lib/gl_array_list.c b/lib/gl_array_list.c
new file mode 100644
index 000000000..f8010ca11
--- /dev/null
+++ b/lib/gl_array_list.c
@@ -0,0 +1,591 @@
+/* Sequential list data type implemented by an array.
+   Copyright (C) 2006 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2006.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification.  */
+#include "gl_array_list.h"
+
+#include <stdlib.h>
+/* Get memcpy.  */
+#include <string.h>
+
+#include "xalloc.h"
+
+/* Checked size_t computations.  */
+#include "xsize.h"
+
+#ifndef uintptr_t
+# define uintptr_t unsigned long
+#endif
+
+/* -------------------------- gl_list_t Data Type -------------------------- */
+
+/* Concrete gl_list_impl type, valid for this file only.  */
+struct gl_list_impl
+{
+  struct gl_list_impl_base base;
+  /* An array of ALLOCATED elements, of which the first COUNT are used.
+     0 <= COUNT <= ALLOCATED.  */
+  const void **elements;
+  size_t count;
+  size_t allocated;
+};
+
+/* struct gl_list_node_impl doesn't exist here.  The pointers are actually
+   indices + 1.  */
+#define INDEX_TO_NODE(index) (gl_list_node_t)(uintptr_t)(size_t)((index) + 1)
+#define NODE_TO_INDEX(node) ((uintptr_t)(node) - 1)
+
+static gl_list_t
+gl_array_create_empty (gl_list_implementation_t implementation,
+		       gl_listelement_equals_fn equals_fn,
+		       gl_listelement_hashcode_fn hashcode_fn,
+		       bool allow_duplicates)
+{
+  struct gl_list_impl *list =
+    (struct gl_list_impl *) xmalloc (sizeof (struct gl_list_impl));
+
+  list->base.vtable = implementation;
+  list->base.equals_fn = equals_fn;
+  list->base.hashcode_fn = hashcode_fn;
+  list->base.allow_duplicates = allow_duplicates;
+  list->elements = NULL;
+  list->count = 0;
+  list->allocated = 0;
+
+  return list;
+}
+
+static gl_list_t
+gl_array_create (gl_list_implementation_t implementation,
+		 gl_listelement_equals_fn equals_fn,
+		 gl_listelement_hashcode_fn hashcode_fn,
+		 bool allow_duplicates,
+		 size_t count, const void **contents)
+{
+  struct gl_list_impl *list =
+    (struct gl_list_impl *) xmalloc (sizeof (struct gl_list_impl));
+
+  list->base.vtable = implementation;
+  list->base.equals_fn = equals_fn;
+  list->base.hashcode_fn = hashcode_fn;
+  list->base.allow_duplicates = allow_duplicates;
+  if (count > 0)
+    {
+      list->elements =
+	(const void **) xmalloc (count * sizeof (const void *));
+      memcpy (list->elements, contents, count * sizeof (const void *));
+    }
+  else
+    list->elements = NULL;
+  list->count = count;
+  list->allocated = count;
+
+  return list;
+}
+
+static size_t
+gl_array_size (gl_list_t list)
+{
+  return list->count;
+}
+
+static const void *
+gl_array_node_value (gl_list_t list, gl_list_node_t node)
+{
+  uintptr_t index = NODE_TO_INDEX (node);
+  if (!(index < list->count))
+    /* Invalid argument.  */
+    abort ();
+  return list->elements[index];
+}
+
+static gl_list_node_t
+gl_array_next_node (gl_list_t list, gl_list_node_t node)
+{
+  uintptr_t index = NODE_TO_INDEX (node);
+  if (!(index < list->count))
+    /* Invalid argument.  */
+    abort ();
+  index++;
+  if (index < list->count)
+    return INDEX_TO_NODE (index);
+  else
+    return NULL;
+}
+
+static gl_list_node_t
+gl_array_previous_node (gl_list_t list, gl_list_node_t node)
+{
+  uintptr_t index = NODE_TO_INDEX (node);
+  if (!(index < list->count))
+    /* Invalid argument.  */
+    abort ();
+  if (index > 0)
+    return INDEX_TO_NODE (index - 1);
+  else
+    return NULL;
+}
+
+static const void *
+gl_array_get_at (gl_list_t list, size_t position)
+{
+  size_t count = list->count;
+
+  if (!(position < count))
+    /* Invalid argument.  */
+    abort ();
+  return list->elements[position];
+}
+
+static gl_list_node_t
+gl_array_set_at (gl_list_t list, size_t position, const void *elt)
+{
+  size_t count = list->count;
+
+  if (!(position < count))
+    /* Invalid argument.  */
+    abort ();
+  list->elements[position] = elt;
+  return INDEX_TO_NODE (position);
+}
+
+static size_t
+gl_array_indexof (gl_list_t list, const void *elt)
+{
+  size_t count = list->count;
+  if (count > 0)
+    {
+      gl_listelement_equals_fn equals = list->base.equals_fn;
+      if (equals != NULL)
+	{
+	  size_t i;
+
+	  for (i = 0;;)
+	    {
+	      if (equals (elt, list->elements[i]))
+		return i;
+	      i++;
+	      if (i == count)
+		break;
+	    }
+	}
+      else
+	{
+	  size_t i;
+
+	  for (i = 0;;)
+	    {
+	      if (elt == list->elements[i])
+		return i;
+	      i++;
+	      if (i == count)
+		break;
+	    }
+	}
+    }
+  return (size_t)(-1);
+}
+
+static gl_list_node_t
+gl_array_search (gl_list_t list, const void *elt)
+{
+  size_t index = gl_array_indexof (list, elt);
+  return INDEX_TO_NODE (index);
+}
+
+/* Ensure that list->allocated > list->count.  */
+static void
+grow (gl_list_t list)
+{
+  size_t new_allocated;
+  size_t memory_size;
+  const void **memory;
+
+  new_allocated = xtimes (list->allocated, 2);
+  new_allocated = xsum (new_allocated, 1);
+  memory_size = xtimes (new_allocated, sizeof (const void *));
+  if (size_overflow_p (memory_size))
+    /* Overflow, would lead to out of memory.  */
+    xalloc_die ();
+  memory = (const void **) xrealloc (list->elements, memory_size);
+  if (memory == NULL)
+    /* Out of memory.  */
+    xalloc_die ();
+  list->elements = memory;
+  list->allocated = new_allocated;
+}
+
+static gl_list_node_t
+gl_array_add_first (gl_list_t list, const void *elt)
+{
+  size_t count = list->count;
+  const void **elements;
+  size_t i;
+
+  if (count == list->allocated)
+    grow (list);
+  elements = list->elements;
+  for (i = count; i > 0; i--)
+    elements[i] = elements[i - 1];
+  elements[0] = elt;
+  list->count = count + 1;
+  return INDEX_TO_NODE (0);
+}
+
+static gl_list_node_t
+gl_array_add_last (gl_list_t list, const void *elt)
+{
+  size_t count = list->count;
+
+  if (count == list->allocated)
+    grow (list);
+  list->elements[count] = elt;
+  list->count = count + 1;
+  return INDEX_TO_NODE (count);
+}
+
+static gl_list_node_t
+gl_array_add_before (gl_list_t list, gl_list_node_t node, const void *elt)
+{
+  size_t count = list->count;
+  uintptr_t index = NODE_TO_INDEX (node);
+  size_t position;
+  const void **elements;
+  size_t i;
+
+  if (!(index < count))
+    /* Invalid argument.  */
+    abort ();
+  position = index;
+  if (count == list->allocated)
+    grow (list);
+  elements = list->elements;
+  for (i = count; i > position; i--)
+    elements[i] = elements[i - 1];
+  elements[position] = elt;
+  list->count = count + 1;
+  return INDEX_TO_NODE (position);
+}
+
+static gl_list_node_t
+gl_array_add_after (gl_list_t list, gl_list_node_t node, const void *elt)
+{
+  size_t count = list->count;
+  uintptr_t index = NODE_TO_INDEX (node);
+  size_t position;
+  const void **elements;
+  size_t i;
+
+  if (!(index < count))
+    /* Invalid argument.  */
+    abort ();
+  position = index + 1;
+  if (count == list->allocated)
+    grow (list);
+  elements = list->elements;
+  for (i = count; i > position; i--)
+    elements[i] = elements[i - 1];
+  elements[position] = elt;
+  list->count = count + 1;
+  return INDEX_TO_NODE (position);
+}
+
+static gl_list_node_t
+gl_array_add_at (gl_list_t list, size_t position, const void *elt)
+{
+  size_t count = list->count;
+  const void **elements;
+  size_t i;
+
+  if (!(position <= count))
+    /* Invalid argument.  */
+    abort ();
+  if (count == list->allocated)
+    grow (list);
+  elements = list->elements;
+  for (i = count; i > position; i--)
+    elements[i] = elements[i - 1];
+  elements[position] = elt;
+  list->count = count + 1;
+  return INDEX_TO_NODE (position);
+}
+
+static bool
+gl_array_remove_node (gl_list_t list, gl_list_node_t node)
+{
+  size_t count = list->count;
+  uintptr_t index = NODE_TO_INDEX (node);
+  size_t position;
+  const void **elements;
+  size_t i;
+
+  if (!(index < count))
+    /* Invalid argument.  */
+    abort ();
+  position = index;
+  elements = list->elements;
+  for (i = position + 1; i < count; i++)
+    elements[i - 1] = elements[i];
+  list->count = count - 1;
+  return true;
+}
+
+static bool
+gl_array_remove_at (gl_list_t list, size_t position)
+{
+  size_t count = list->count;
+  const void **elements;
+  size_t i;
+
+  if (!(position < count))
+    /* Invalid argument.  */
+    abort ();
+  elements = list->elements;
+  for (i = position + 1; i < count; i++)
+    elements[i - 1] = elements[i];
+  list->count = count - 1;
+  return true;
+}
+
+static bool
+gl_array_remove (gl_list_t list, const void *elt)
+{
+  size_t position = gl_array_indexof (list, elt);
+  if (position == (size_t)(-1))
+    return false;
+  else
+    return gl_array_remove_at (list, position);
+}
+
+static void
+gl_array_list_free (gl_list_t list)
+{
+  if (list->elements != NULL)
+    free (list->elements);
+  free (list);
+}
+
+/* --------------------- gl_list_iterator_t Data Type --------------------- */
+
+static gl_list_iterator_t
+gl_array_iterator (gl_list_t list)
+{
+  gl_list_iterator_t result;
+
+  result.vtable = list->base.vtable;
+  result.list = list;
+  result.count = list->count;
+  result.p = list->elements + 0;
+  result.q = list->elements + list->count;
+
+  return result;
+}
+
+static gl_list_iterator_t
+gl_array_iterator_from_to (gl_list_t list, size_t start_index, size_t end_index)
+{
+  gl_list_iterator_t result;
+
+  if (!(start_index <= end_index && end_index <= list->count))
+    /* Invalid arguments.  */
+    abort ();
+  result.vtable = list->base.vtable;
+  result.list = list;
+  result.count = list->count;
+  result.p = list->elements + start_index;
+  result.q = list->elements + end_index;
+
+  return result;
+}
+
+static bool
+gl_array_iterator_next (gl_list_iterator_t *iterator,
+			const void **eltp, gl_list_node_t *nodep)
+{
+  gl_list_t list = iterator->list;
+  if (iterator->count != list->count)
+    {
+      if (iterator->count != list->count + 1)
+	/* Concurrent modifications were done on the list.  */
+	abort ();
+      /* The last returned element was removed.  */
+      iterator->count--;
+      iterator->p--;
+      iterator->q--;
+    }
+  if (iterator->p < iterator->q)
+    {
+      const void **p = (const void **) iterator->p;
+      *eltp = *p;
+      if (nodep != NULL)
+	*nodep = INDEX_TO_NODE (p - list->elements);
+      iterator->p = p + 1;
+      return true;
+    }
+  else
+    return false;
+}
+
+static void
+gl_array_iterator_free (gl_list_iterator_t *iterator)
+{
+}
+
+/* ---------------------- Sorted gl_list_t Data Type ---------------------- */
+
+static size_t
+gl_array_sortedlist_indexof (gl_list_t list, gl_listelement_compar_fn compar,
+			     const void *elt)
+{
+  size_t count = list->count;
+
+  if (count > 0)
+    {
+      size_t low = 0;
+      size_t high = count;
+
+      /* At each loop iteration, low < high; for indices < low the values
+	 are smaller than ELT; for indices >= high the values are greater
+	 than ELT.  So, if the element occurs in the list, is at
+	 low <= position < high.  */
+      do
+	{
+	  size_t mid = low + (high - low) / 2; /* low <= mid < high */
+	  int cmp = compar (list->elements[mid], elt);
+
+	  if (cmp < 0)
+	    low = mid + 1;
+	  else if (cmp > 0)
+	    high = mid;
+	  else /* cmp == 0 */
+	    {
+	      /* We have an element equal to ELT at index MID.  But we need
+		 the minimal such index.  */
+	      high = mid;
+	      /* At each loop iteration, low <= high and
+		   compar (list->elements[high], elt) == 0,
+		 and we know that the first occurrence of the element is at
+		 low <= position <= high.  */
+	      while (low < high)
+		{
+		  size_t mid2 = low + (high - low) / 2; /* low <= mid < high */
+		  int cmp2 = compar (list->elements[mid2], elt);
+
+		  if (cmp2 < 0)
+		    low = mid2 + 1;
+		  else if (cmp2 > 0)
+		    /* The list was not sorted.  */
+		    abort ();
+		  else /* cmp2 == 0 */
+		    {
+		      if (mid2 == low)
+			break;
+		      high = mid2 - 1;
+		    }
+		}
+	      return low;
+	    }
+	}
+      while (low < high);
+      /* Here low == high.  */
+    }
+  return (size_t)(-1);
+}
+
+static gl_list_node_t
+gl_array_sortedlist_search (gl_list_t list, gl_listelement_compar_fn compar,
+			    const void *elt)
+{
+  size_t index = gl_array_sortedlist_indexof (list, compar, elt);
+  return INDEX_TO_NODE (index);
+}
+
+static gl_list_node_t
+gl_array_sortedlist_add (gl_list_t list, gl_listelement_compar_fn compar,
+			 const void *elt)
+{
+  size_t count = list->count;
+  size_t low = 0;
+  size_t high = count;
+
+  /* At each loop iteration, low <= high; for indices < low the values are
+     smaller than ELT; for indices >= high the values are greater than ELT.  */
+  while (low < high)
+    {
+      size_t mid = low + (high - low) / 2; /* low <= mid < high */
+      int cmp = compar (list->elements[mid], elt);
+
+      if (cmp < 0)
+	low = mid + 1;
+      else if (cmp > 0)
+	high = mid;
+      else /* cmp == 0 */
+	{
+	  low = mid;
+	  break;
+	}
+    }
+  return gl_array_add_at (list, low, elt);
+}
+
+static bool
+gl_array_sortedlist_remove (gl_list_t list, gl_listelement_compar_fn compar,
+			    const void *elt)
+{
+  size_t index = gl_array_sortedlist_indexof (list, compar, elt);
+  if (index == (size_t)(-1))
+    return false;
+  else
+    return gl_array_remove_at (list, index);
+}
+
+
+const struct gl_list_implementation gl_array_list_implementation =
+  {
+    gl_array_create_empty,
+    gl_array_create,
+    gl_array_size,
+    gl_array_node_value,
+    gl_array_next_node,
+    gl_array_previous_node,
+    gl_array_get_at,
+    gl_array_set_at,
+    gl_array_search,
+    gl_array_indexof,
+    gl_array_add_first,
+    gl_array_add_last,
+    gl_array_add_before,
+    gl_array_add_after,
+    gl_array_add_at,
+    gl_array_remove_node,
+    gl_array_remove_at,
+    gl_array_remove,
+    gl_array_list_free,
+    gl_array_iterator,
+    gl_array_iterator_from_to,
+    gl_array_iterator_next,
+    gl_array_iterator_free,
+    gl_array_sortedlist_search,
+    gl_array_sortedlist_indexof,
+    gl_array_sortedlist_add,
+    gl_array_sortedlist_remove
+  };
diff --git a/lib/gl_array_list.h b/lib/gl_array_list.h
new file mode 100644
index 000000000..afdb75f72
--- /dev/null
+++ b/lib/gl_array_list.h
@@ -0,0 +1,35 @@
+/* Sequential list data type implemented by an array.
+   Copyright (C) 2006 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2006.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _GL_ARRAY_LIST_H
+#define _GL_ARRAY_LIST_H
+
+#include "gl_list.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern const struct gl_list_implementation gl_array_list_implementation;
+#define GL_ARRAY_LIST &gl_array_list_implementation
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _GL_ARRAY_LIST_H */
diff --git a/modules/array-list b/modules/array-list
new file mode 100644
index 000000000..946789ca7
--- /dev/null
+++ b/modules/array-list
@@ -0,0 +1,26 @@
+Description:
+Sequential list data type implemented by an array.
+
+Files:
+lib/gl_array_list.h
+lib/gl_array_list.c
+
+Depends-on:
+list
+xalloc
+xsize
+
+configure.ac:
+
+Makefile.am:
+lib_SOURCES += gl_array_list.h gl_array_list.c
+
+Include:
+"gl_array_list.h"
+
+License:
+GPL
+
+Maintainer:
+Bruno Haible
+