ref: c8b187f9db503465460d8bafa2d7a758bbcf59ca
dir: /libfreetype/ftutil.c/
/***************************************************************************/ /* */ /* ftutil.c */ /* */ /* FreeType utility file for memory and list management (body). */ /* */ /* Copyright 2002 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ /* modified, and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #include <ft2build.h> #include FT_INTERNAL_DEBUG_H #include FT_INTERNAL_MEMORY_H #include FT_LIST_H /*************************************************************************/ /* */ /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ /* messages during execution. */ /* */ #undef FT_COMPONENT #define FT_COMPONENT trace_memory /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** *****/ /***** M E M O R Y M A N A G E M E N T *****/ /***** *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* documentation is in ftmemory.h */ FT_BASE_DEF( FT_Error ) FT_Alloc( FT_Memory memory, FT_Long size, void* *P ) { FT_ASSERT( P != 0 ); if ( size > 0 ) { *P = memory->alloc( memory, size ); if ( !*P ) { FT_ERROR(( "FT_Alloc:" )); FT_ERROR(( " Out of memory? (%ld requested)\n", size )); return FT_Err_Out_Of_Memory; } FT_MEM_ZERO( *P, size ); } else *P = NULL; FT_TRACE7(( "FT_Alloc:" )); FT_TRACE7(( " size = %ld, block = 0x%08p, ref = 0x%08p\n", size, *P, P )); return FT_Err_Ok; } /* documentation is in ftmemory.h */ FT_BASE_DEF( FT_Error ) FT_Realloc( FT_Memory memory, FT_Long current, FT_Long size, void** P ) { void* Q; FT_ASSERT( P != 0 ); /* if the original pointer is NULL, call FT_Alloc() */ if ( !*P ) return FT_Alloc( memory, size, P ); /* if the new block if zero-sized, clear the current one */ if ( size <= 0 ) { FT_Free( memory, P ); return FT_Err_Ok; } Q = memory->realloc( memory, current, size, *P ); if ( !Q ) goto Fail; if ( size > current ) FT_MEM_ZERO( (char*)Q + current, size - current ); *P = Q; return FT_Err_Ok; Fail: FT_ERROR(( "FT_Realloc:" )); FT_ERROR(( " Failed (current %ld, requested %ld)\n", current, size )); return FT_Err_Out_Of_Memory; } /* documentation is in ftmemory.h */ FT_BASE_DEF( void ) FT_Free( FT_Memory memory, void** P ) { FT_TRACE7(( "FT_Free:" )); FT_TRACE7(( " Freeing block 0x%08p, ref 0x%08p\n", P, P ? *P : (void*)0 )); if ( P && *P ) { memory->free( memory, *P ); *P = 0; } } /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** *****/ /***** D O U B L Y L I N K E D L I S T S *****/ /***** *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ #undef FT_COMPONENT #define FT_COMPONENT trace_list /* documentation is in ftlist.h */ FT_EXPORT_DEF( FT_ListNode ) FT_List_Find( FT_List list, void* data ) { FT_ListNode cur; cur = list->head; while ( cur ) { if ( cur->data == data ) return cur; cur = cur->next; } return (FT_ListNode)0; } /* documentation is in ftlist.h */ FT_EXPORT_DEF( void ) FT_List_Add( FT_List list, FT_ListNode node ) { FT_ListNode before = list->tail; node->next = 0; node->prev = before; if ( before ) before->next = node; else list->head = node; list->tail = node; } /* documentation is in ftlist.h */ FT_EXPORT_DEF( void ) FT_List_Insert( FT_List list, FT_ListNode node ) { FT_ListNode after = list->head; node->next = after; node->prev = 0; if ( !after ) list->tail = node; else after->prev = node; list->head = node; } /* documentation is in ftlist.h */ FT_EXPORT_DEF( void ) FT_List_Remove( FT_List list, FT_ListNode node ) { FT_ListNode before, after; before = node->prev; after = node->next; if ( before ) before->next = after; else list->head = after; if ( after ) after->prev = before; else list->tail = before; } /* documentation is in ftlist.h */ FT_EXPORT_DEF( void ) FT_List_Up( FT_List list, FT_ListNode node ) { FT_ListNode before, after; before = node->prev; after = node->next; /* check whether we are already on top of the list */ if ( !before ) return; before->next = after; if ( after ) after->prev = before; else list->tail = before; node->prev = 0; node->next = list->head; list->head->prev = node; list->head = node; } /* documentation is in ftlist.h */ FT_EXPORT_DEF( FT_Error ) FT_List_Iterate( FT_List list, FT_List_Iterator iterator, void* user ) { FT_ListNode cur = list->head; FT_Error error = FT_Err_Ok; while ( cur ) { FT_ListNode next = cur->next; error = iterator( cur, user ); if ( error ) break; cur = next; } return error; } /* documentation is in ftlist.h */ FT_EXPORT_DEF( void ) FT_List_Finalize( FT_List list, FT_List_Destructor destroy, FT_Memory memory, void* user ) { FT_ListNode cur; cur = list->head; while ( cur ) { FT_ListNode next = cur->next; void* data = cur->data; if ( destroy ) destroy( memory, data, user ); FT_FREE( cur ); cur = next; } list->head = 0; list->tail = 0; } /* END */