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