cSvn-UI for SVN Repositories

diff --git a/csvncgi/dlist.c b/csvncgi/dlist.c
new file mode 100644
index 0000000..fc91f2b
--- /dev/null
+++ b/csvncgi/dlist.c
@@ -0,0 +1,691 @@
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+
+#include <dlist.h>
+
+
+#define DLIST_ERRMSG_SIZE 4096
+
+void dlist_error( const char *fmt, ... )
+{
+  va_list arg_ptr;
+  char  buf[DLIST_ERRMSG_SIZE];
+  char  msg[DLIST_ERRMSG_SIZE];
+  char *format = "%s: %s\n";
+
+  va_start( arg_ptr, fmt );
+
+  vsnprintf( msg, DLIST_ERRMSG_SIZE, (const void *)fmt, arg_ptr );
+
+  va_end( arg_ptr ); /* Reset variable arguments. */
+
+  snprintf( buf, DLIST_ERRMSG_SIZE, format, "dlist", msg );
+
+  (void)write( STDERR_FILENO, buf, strlen( buf ) );
+
+  exit( 1 );
+}
+
+dlist_errfunc dlist_fatal = dlist_error;
+
+
+struct dlist *__dlist_alloc( void )
+{
+  struct dlist *list = NULL;
+
+  list = (struct dlist *)malloc( sizeof( struct dlist ) );
+  if( !list ) { dlist_fatal( "Cannot allocate memory" ); }
+
+  bzero( (void *)list, sizeof( struct dlist ) );
+
+  return list;
+}
+
+
+
+struct dlist *dlist_first( struct dlist *list )
+{
+  while( list && dlist_prev( list ) ) list = dlist_prev( list );
+
+  return list;
+}
+
+struct dlist *dlist_last( struct dlist *list )
+{
+  while( list && dlist_next( list ) ) list = dlist_next( list );
+
+  return list;
+}
+
+int dlist_length( struct dlist *list )
+{
+  int n = 0;
+
+  while( list )
+  {
+    list = dlist_next( list );
+    ++n;
+  }
+
+  return n;
+}
+
+struct dlist *dlist_nth( struct dlist *list, int n )
+{
+  while( list && (n-- > 0) )
+  {
+    list = dlist_next( list );
+  }
+
+  return list;
+}
+
+void *dlist_nth_data( struct dlist *list, int n )
+{
+  while( list && (n-- > 0) )
+  {
+    list = dlist_next( list );
+  }
+
+  return list ? list->data : NULL;
+}
+
+int dlist_position( struct dlist *list, struct dlist *link )
+{
+  int n = 0;
+
+  while( list )
+  {
+    if( list == link ) return n;
+    ++n;
+    list = dlist_next( list );
+  }
+
+  return -1;
+}
+
+int dlist_index( struct dlist *list, const void *data )
+{
+  int n = 0;
+
+  while( list )
+  {
+    if( list->data == data ) return n;
+    ++n;
+    list = dlist_next( list );
+  }
+
+  return -1;
+}
+
+struct dlist *dlist_find( struct dlist *list, const void *data )
+{
+  while( list )
+  {
+    if( list->data == data ) { break; }
+    list = dlist_next( list );
+  }
+
+  return list;
+}
+
+
+struct dlist *dlist_find_data( struct dlist *list, DLCMPF cmp_func, const void *data )
+{
+  if( !list || !cmp_func ) return NULL;
+
+  while( list )
+  {
+    if( ! cmp_func( list->data, data ) ) { return list; }
+    list = dlist_next( list );
+  }
+
+  return NULL;
+}
+
+
+struct dlist *dlist_append( struct dlist *list, void *data )
+{
+  struct dlist *node = NULL;
+  struct dlist *last = NULL;
+
+  node = __dlist_alloc();
+  node->data = data;
+
+  if( list )
+  {
+    last = dlist_last( list );
+
+    dlist_next( last ) = node;
+    dlist_prev( node ) = last;
+
+    return list;
+  }
+
+  return node;
+}
+
+struct dlist *dlist_prepend( struct dlist *list, void *data )
+{
+  struct dlist *node  = NULL;
+  struct dlist *first = NULL;
+
+  node = __dlist_alloc();
+  node->data = data;
+
+  if( list )
+  {
+    first = dlist_first( list );
+
+    dlist_prev( first ) = node;
+    dlist_next( node )  = first;
+
+    return node;
+  }
+
+  return node;
+}
+
+struct dlist *dlist_insert( struct dlist *list, void *data, int position )
+{
+  struct dlist *node  = NULL;
+  struct dlist *ptr   = NULL;
+
+  if( position  < 0 ) { return dlist_append( list, data );  }
+  if( position == 0 ) { return dlist_prepend( list, data ); }
+
+  ptr = dlist_nth( list, position );
+  if( !ptr ) { return dlist_append( list, data ); }
+
+  node = __dlist_alloc();
+  node->data = data;
+
+  node->prev = ptr->prev;
+  ptr->prev->next = node;
+  node->next = ptr;
+  ptr->prev = node;
+
+  return list;
+}
+
+struct dlist *dlist_insert_sorted( struct dlist *list, DLCMPF cmp_func, void *data )
+{
+  struct dlist *node  = NULL;
+  struct dlist *ptr   = list;
+  int cmp;
+
+  if( !cmp_func ) return list;
+
+  if( !list )
+  {
+    node = __dlist_alloc();
+    node->data = data;
+    return node;
+  }
+
+  cmp = cmp_func( data, ptr->data );
+
+  while( (ptr->next) && (cmp > 0) )
+  {
+    ptr = ptr->next;
+    cmp = cmp_func( data, ptr->data );
+  }
+
+  node = __dlist_alloc();
+  node->data = data;
+
+  if( (!ptr->next) && (cmp > 0) )
+  {
+    ptr->next = node;
+    node->prev = ptr;
+    return list;
+  }
+
+  if( ptr->prev )
+  {
+    ptr->prev->next = node;
+    node->prev = ptr->prev;
+  }
+  node->next = ptr;
+  ptr->prev = node;
+
+  if( ptr == list )
+    return node;
+  else
+    return list;
+}
+
+struct dlist *dlist_insert_sorted_with_data( struct dlist *list, DLCMPDF cmp_func, void *data, void *user_data )
+{
+  struct dlist *node  = NULL;
+  struct dlist *ptr   = list;
+  int cmp;
+
+  if( !cmp_func ) return list;
+
+  if( !list )
+  {
+    node = __dlist_alloc();
+    node->data = data;
+    return node;
+  }
+
+  cmp = cmp_func( data, ptr->data, user_data );
+
+  while( (ptr->next) && (cmp > 0) )
+  {
+    ptr = ptr->next;
+    cmp = cmp_func( data, ptr->data, user_data );
+  }
+
+  node = __dlist_alloc();
+  node->data = data;
+
+  if( (!ptr->next) && (cmp > 0) )
+  {
+    ptr->next = node;
+    node->prev = ptr;
+    return list;
+  }
+
+  if( ptr->prev )
+  {
+    ptr->prev->next = node;
+    node->prev = ptr->prev;
+  }
+  node->next = ptr;
+  ptr->prev = node;
+
+  if( ptr == list )
+    return node;
+  else
+    return list;
+}
+
+struct dlist *dlist_concat( struct dlist *list1, struct dlist *list2 )
+{
+  struct dlist *ptr   = NULL;
+
+  if( list2 )
+  {
+    ptr = dlist_last( list1 );
+    if( ptr )
+      ptr->next = list2;
+    else
+      list1 = list2;
+
+    list2->prev = ptr;
+  }
+
+  return list1;
+}
+
+struct dlist *dlist_insert_list( struct dlist *list1, struct dlist *list2, int position )
+{
+  struct dlist *last  = NULL;
+  struct dlist *ptr   = NULL;
+
+  if( position  < 0 ) { return dlist_concat( list1, list2 ); }
+  if( position == 0 ) { return dlist_concat( list2, list1 ); }
+
+  ptr = dlist_nth( list1, position );
+  if( !ptr ) { return dlist_concat( list1, list2 ); }
+
+  last = dlist_last( list2 );
+  if( last )
+  {
+    list2->prev = ptr->prev;
+    ptr->prev->next = list2;
+    last->next = ptr;
+    ptr->prev = last;
+  }
+
+  return list1;
+}
+
+struct dlist *__dlist_remove_link( struct dlist *list, struct dlist *link )
+{
+  if( link == NULL ) return list;
+
+  if( link->prev )
+  {
+    if( link->prev->next == link )
+    {
+        link->prev->next = link->next;
+    }
+    else
+    {
+      dlist_fatal( "Corrupted double-linked list detected" );
+    }
+  }
+  if( link->next )
+  {
+    if( link->next->prev == link )
+    {
+      link->next->prev = link->prev;
+    }
+    else
+    {
+      dlist_fatal( "Corrupted double-linked list detected" );
+    }
+  }
+
+  if( link == list ) list = list->next;
+
+  link->next = NULL;
+  link->prev = NULL;
+
+  return list;
+}
+
+struct dlist *dlist_remove( struct dlist *list, const void *data )
+{
+  struct dlist *ptr = list;
+
+  while( ptr )
+  {
+    if( ptr->data != data )
+    {
+      ptr = ptr->next;
+    }
+    else
+    {
+      list = __dlist_remove_link( list, ptr );
+      free( ptr );
+
+      break;
+    }
+  }
+
+  return list;
+}
+
+struct dlist *dlist_remove_all( struct dlist *list, const void *data )
+{
+  struct dlist *ptr = list;
+
+  while( ptr )
+  {
+    if( ptr->data != data )
+    {
+      ptr = ptr->next;
+    }
+    else
+    {
+      struct dlist *next = ptr->next;
+
+      if( ptr->prev )
+        ptr->prev->next = next;
+      else
+        list = next;
+
+      if( next )
+        next->prev = ptr->prev;
+
+      free( ptr );
+
+      ptr = next;
+    }
+  }
+
+  return list;
+}
+
+struct dlist *dlist_remove_data( struct dlist *list, DLCMPF cmp_func, DLFUNC free_func, const void *data )
+{
+  struct dlist *ptr = list;
+
+  if( !cmp_func ) return list;
+
+  while( ptr )
+  {
+    if( cmp_func( ptr->data, data ) != 0 )
+    {
+      ptr = ptr->next;
+    }
+    else
+    {
+      list = __dlist_remove_link( list, ptr );
+      if( free_func ) free_func( ptr->data, (void *)data ); /* free_func() can compare pointers */
+      free( ptr );
+
+      break;
+    }
+  }
+
+  return list;
+}
+
+struct dlist *dlist_remove_data_all( struct dlist *list, DLCMPF cmp_func, DLFUNC free_func, const void *data )
+{
+  struct dlist *ptr = list;
+
+  if( !cmp_func ) return list;
+
+  while( ptr )
+  {
+    if( cmp_func( ptr->data, data ) != 0 )
+    {
+      ptr = ptr->next;
+    }
+    else
+    {
+      struct dlist *next = ptr->next;
+
+      if( ptr->prev )
+        ptr->prev->next = next;
+      else
+        list = next;
+
+      if( next )
+        next->prev = ptr->prev;
+
+      if( free_func ) free_func( ptr->data, (void *)data ); /* free_func() can compare pointers */
+      free( ptr );
+
+      ptr = next;
+    }
+  }
+
+  return list;
+}
+
+
+struct dlist *dlist_copy( struct dlist *list )
+{
+  struct dlist *copy = NULL;
+
+  while( list )
+  {
+    copy = dlist_append( copy, list->data );
+    list = dlist_next( list );
+  }
+
+  return copy;
+}
+
+/* It simply switches the next and prev pointers of each element. */
+struct dlist *dlist_reverse( struct dlist *list )
+{
+  struct dlist *last = NULL;
+
+  while( list )
+  {
+    last = list;
+    list = last->next;
+    last->next = last->prev;
+    last->prev = list;
+  }
+
+  return last;
+}
+
+
+static struct dlist *__dlist_sort_merge( struct dlist *l1, struct dlist *l2, DLCMPF cmp_func )
+{
+  struct dlist list, *l, *lprev;
+  int   cmp;
+
+  l = &list; 
+  lprev = NULL;
+
+  while( l1 && l2 )
+  {
+    cmp = ((DLCMPF) cmp_func)( l1->data, l2->data );
+
+    if( cmp <= 0 )
+    {
+      l->next = l1;
+      l1 = l1->next;
+    }
+    else
+    {
+      l->next = l2;
+      l2 = l2->next;
+    }
+    l = l->next;
+    l->prev = lprev; 
+    lprev = l;
+  }
+  l->next = l1 ? l1 : l2;
+  l->next->prev = l;
+
+  return list.next;
+}
+
+static struct dlist *__dlist_sort_merge_with_data( struct dlist *l1, struct dlist *l2, DLCMPDF cmp_func, void *user_data )
+{
+  struct dlist list, *l, *lprev;
+  int   cmp;
+
+  l = &list; 
+  lprev = NULL;
+
+  while( l1 && l2 )
+  {
+    cmp = ((DLCMPDF) cmp_func)( l1->data, l2->data, user_data );
+
+    if( cmp <= 0 )
+    {
+      l->next = l1;
+      l1 = l1->next;
+    }
+    else
+    {
+      l->next = l2;
+      l2 = l2->next;
+    }
+    l = l->next;
+    l->prev = lprev; 
+    lprev = l;
+  }
+  l->next = l1 ? l1 : l2;
+  l->next->prev = l;
+
+  return list.next;
+}
+
+
+static struct dlist *__dlist_sort_real( struct dlist *list, DLCMPF cmp_func )
+{
+  struct dlist *l1, *l2;
+
+  if( !list )
+    return NULL;
+  if( !list->next )
+    return list;
+
+  l1 = list; 
+  l2 = list->next;
+
+  while( (l2 = l2->next) != NULL )
+  {
+    if( (l2 = l2->next) == NULL )
+      break;
+    l1 = l1->next;
+  }
+  l2 = l1->next;
+  l1->next = NULL;
+
+  return __dlist_sort_merge( __dlist_sort_real( list, cmp_func ),
+                             __dlist_sort_real( l2, cmp_func ),
+                             cmp_func );
+}
+
+static struct dlist *__dlist_sort_real_with_data( struct dlist *list, DLCMPDF cmp_func, void *user_data )
+{
+  struct dlist *l1, *l2;
+
+  if( !list )
+    return NULL;
+  if( !list->next )
+    return list;
+
+  l1 = list; 
+  l2 = list->next;
+
+  while( (l2 = l2->next) != NULL )
+  {
+    if( (l2 = l2->next) == NULL )
+      break;
+    l1 = l1->next;
+  }
+  l2 = l1->next;
+  l1->next = NULL;
+
+  return __dlist_sort_merge_with_data( __dlist_sort_real_with_data( list, cmp_func, user_data ),
+                                       __dlist_sort_real_with_data( l2, cmp_func, user_data ),
+                                       cmp_func,
+                                       user_data );
+}
+
+
+struct dlist *dlist_sort( struct dlist *list, DLCMPF cmp_func )
+{
+  return __dlist_sort_real( list, cmp_func );
+}
+
+struct dlist *dlist_sort_with_data( struct dlist *list, DLCMPDF cmp_func, void *user_data )
+{
+  return __dlist_sort_real_with_data( list, cmp_func, user_data );
+}
+
+
+void dlist_foreach( struct dlist *list, DLFUNC func, void *user_data )
+{
+  struct dlist *next = NULL;
+
+  while( list )
+  {
+    next = dlist_next( list );
+    if( func ) { func( list->data, user_data ); }
+    list = next;
+  }
+}
+
+
+void __dlist_free( struct dlist *list )
+{
+  struct dlist *next = NULL;
+
+  while( list )
+  {
+    next = dlist_next( list );
+    free( list ); list = NULL;
+    list = next;
+  }
+}
+
+void dlist_free( struct dlist *list, DLFUNC free_func )
+{
+  dlist_foreach( list, free_func, NULL );
+  __dlist_free( list );
+}