compiler/libjpeg/main/jinclude.h

   1 /*
   2     $Id$
   3 */
   4
   5 /*
   6  * jinclude.h
   7  *
   8  * Copyright (C) 1991-1994, Thomas G. Lane.
   9  * This file is part of the Independent JPEG Group's software.
  10  * For conditions of distribution and use, see the accompanying README file.
  11  *
  12  * This file exists to provide a single place to fix any problems with
  13  * including the wrong system include files.  (Common problems are taken
  14  * care of by the standard jconfig symbols, but on really weird systems
  15  * you may have to edit this file.)
  16  *
  17  * NOTE: this file is NOT intended to be included by applications using the
  18  * JPEG library.  Most applications need only include jpeglib.h.
  19  */
  20
  21
  22 /* Include auto-config file to find out which system include files we need. */
  23
  24 #include "jconfig.h"            /* auto configuration options */
  25 #define JCONFIG_INCLUDED        /* so that jpeglib.h doesn't do it again */
  26
  27 /*
  28  * We need the NULL macro and size_t typedef.
  29  * On an ANSI-conforming system it is sufficient to include <stddef.h>.
  30  * Otherwise, we get them from <stdlib.h> or <stdio.h>; we may have to
  31  * pull in <sys/types.h> as well.
  32  * Note that the core JPEG library does not require <stdio.h>;
  33  * only the default error handler and data source/destination modules do.
  34  * But we must pull it in because of the references to FILE in jpeglib.h.
  35  * You can remove those references if you want to compile without <stdio.h>.
  36  */
  37
  38 #ifdef HAVE_STDDEF_H
  39 #include <stddef.h>
  40 #endif
  41
  42 #ifdef HAVE_STDLIB_H
  43 #include <stdlib.h>
  44 #endif
  45
  46 #ifdef NEED_SYS_TYPES_H
  47 #include <sys/types.h>
  48 #endif
  49
  50 #include <stdio.h>
  51
  52 /*
  53  * We need memory copying and zeroing functions, plus strncpy().
  54  * ANSI and System V implementations declare these in <string.h>.
  55  * BSD doesn't have the mem() functions, but it does have bcopy()/bzero().
  56  * Some systems may declare memset and memcpy in <memory.h>.
  57  *
  58  * NOTE: we assume the size parameters to these functions are of type size_t.
  59  * Change the casts in these macros if not!
  60  */
  61
  62 #ifdef NEED_BSD_STRINGS
  63
  64 #include <strings.h>
  65 #define MEMZERO(target,size)    bzero((void *)(target), (size_t)(size))
  66 #define MEMCOPY(dest,src,size)  bcopy((const void *)(src), (void *)(dest), (size_t)(size))
  67
  68 #else /* not BSD, assume ANSI/SysV string lib */
  69
  70 #include <string.h>
  71 #define MEMZERO(target,size)    memset((void *)(target), 0, (size_t)(size))
  72 #define MEMCOPY(dest,src,size)  memcpy((void *)(dest), (const void *)(src), (size_t)(size))
  73
  74 #endif
  75
  76 /*
  77  * In ANSI C, and indeed any rational implementation, size_t is also the
  78  * type returned by sizeof().  However, it seems there are some irrational
  79  * implementations out there, in which sizeof() returns an int even though
  80  * size_t is defined as long or unsigned long.  To ensure consistent results
  81  * we always use this SIZEOF() macro in place of using sizeof() directly.
  82  */
  83
  84 #define SIZEOF(object)  ((size_t) sizeof(object))
  85
  86 /*
  87  * The modules that use fread() and fwrite() always invoke them through
  88  * these macros.  On some systems you may need to twiddle the argument casts.
  89  * CAUTION: argument order is different from underlying functions!
  90  */
  91
  92 #define JFREAD(file,buf,sizeofbuf)  \
  93   ((size_t) fread((void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))
  94 #define JFWRITE(file,buf,sizeofbuf)  \
  95   ((size_t) fwrite((const void *) (buf), (size_t) 1, (size_t) (sizeofbuf), (file)))