The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/varargs.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1993 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  *
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  *
   23  * any improvements or extensions that they make and grant Carnegie Mellon rights
   24  * to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        varargs.h,v $
   29  * Revision 2.13  93/02/01  09:50:39  danner
   30  *      Updated copyright.
   31  *      [93/01/12            berman]
   32  *      Added sparc clause to include sun4/varargs.h.
   33  *      [92/12/24            berman]
   34  * 
   35  * Revision 2.12  93/01/14  18:00:15  danner
   36  *      Added alpha.
   37  *      [92/12/01            af]
   38  * 
   39  * Revision 2.11  92/08/03  17:59:48  jfriedl
   40  *      Include gcc 2.x derived va-m88k.h for m88k [danner] or m88k
   41  *      Added pc532 support [Johannes Helander (jvh@cs.hut.fi)]
   42  *      [92/07/24            jfriedl]
   43  * 
   44  * Revision 2.10  91/12/10  16:32:53  jsb
   45  *      Fixes from Intel
   46  *      [91/12/10  15:52:01  jsb]
   47  * 
   48  * Revision 2.9  91/09/12  16:54:22  bohman
   49  *      Added mac2.
   50  *      [91/09/11  17:22:52  bohman]
   51  * 
   52  * Revision 2.8  91/07/09  23:23:50  danner
   53  *      Added luna88k support.
   54  *      [91/06/24            danner]
   55  * 
   56  * Revision 2.7  91/06/18  20:53:02  jsb
   57  *      Moved i860 varargs code here from i860/i860_varargs.h, thanks to
   58  *      new copyright from Intel.
   59  *      [91/06/18  19:15:02  jsb]
   60  * 
   61  * Revision 2.6  91/05/14  17:40:46  mrt
   62  *      Correcting copyright
   63  * 
   64  * Revision 2.5  91/02/05  17:57:12  mrt
   65  *      Changed to new Mach copyright
   66  *      [91/02/01  17:49:51  mrt]
   67  * 
   68  * Revision 2.4  90/11/25  17:48:50  jsb
   69  *      Added i860 support.
   70  *      [90/11/25  16:54:09  jsb]
   71  * 
   72  * Revision 2.3  90/05/03  15:51:29  dbg
   73  *      Added i386.
   74  *      [90/02/08            dbg]
   75  * 
   76  * Revision 2.2  89/11/29  14:16:44  af
   77  *      RCS-ed, added mips case.  Mips also needs it in Mach standalone
   78  *      programs.
   79  *      [89/10/28  10:39:14  af]
   80  * 
   81  */
   82 
   83 #ifndef _SYS_VARARGS_H_
   84 #define _SYS_VARARGS_H_
   85 
   86 #if     defined(vax) || defined(sun3) || defined(mips) || defined(i386) || defined(mac2) || defined(PC532)
   87 #define va_dcl  int     va_alist;
   88 typedef char *  va_list;
   89 
   90 #define va_start(pvar)  (pvar) = (va_list)&va_alist
   91 #define va_end(pvar)
   92 #ifdef  mips
   93 # define va_arg(pvar, type) ((type *)(pvar = \
   94                 (va_list) (sizeof(type) > 4 ? ((int)pvar + 2*8 - 1) & -8 \
   95                                    : ((int)pvar + 2*4 - 1) & -4)))[-1]
   96 #else   mips
   97 #define va_arg(pvar,type)       (               \
   98                 (pvar) += ((sizeof(type)+3) & ~0x3),    \
   99                 *((type *)((pvar) - ((sizeof(type)+3) & ~0x3))) )
  100 #endif  mips
  101 #endif  /* vax */
  102 
  103 /*
  104  * Try to make varargs work for the Multimax so that _doprnt can be
  105  * declared as
  106  *      _doprnt(file, fmt, list)
  107  *      FILE    *file;
  108  *      char    *fmt;
  109  *      va_list *list;
  110  * and use
  111  *
  112  *      n = va_arg(*list, type)
  113  *
  114  * without needing to drag in extra declarations
  115  *
  116  * and printf becomes
  117  *
  118  * printf(fmt, va_alist)
  119  *      char    *fmt;
  120  *      va_dcl
  121  * {
  122  *      va_list listp;
  123  *      va_start(listp);
  124  *      _doprnt((FILE *)0, fmt, &listp);
  125  *      va_end(listp);
  126  * }
  127  */
  128 
  129 #if     defined(multimax) && defined(KERNEL)
  130 
  131 /*
  132  * the vararglist pointer is an elaborate structure (ecch)
  133  */
  134 typedef struct va_list {
  135         char    *va_item;       /* current item */
  136         int     *va_ptr1,       /* arglist pointers for 1, 2, n */
  137                 *va_ptr2,
  138                 *va_ptrn;
  139         int     va_ct;          /* current argument number */
  140 } va_list;
  141 
  142 #define va_alist        va_arg1, va_arg2, va_argn
  143 #define va_dcl          int     va_arg1, va_arg2, va_argn;
  144 
  145 #define va_start(pvar)  (               \
  146         (pvar).va_ptr1 = &va_arg1,      \
  147         (pvar).va_ptr2 = &va_arg2,      \
  148         (pvar).va_ptrn = &va_argn,      \
  149         (pvar).va_ct = 0 )
  150 
  151 #define va_end(pvar)
  152 
  153 #define va_arg(pvar, type)      (       \
  154         (pvar).va_ct++,                 \
  155         (pvar).va_item = (char *)       \
  156           ( ((pvar).va_ct == 1)         \
  157             ? (pvar).va_ptr1            \
  158             : ((pvar).va_ct == 2)       \
  159               ? (pvar).va_ptr2          \
  160               : (pvar).va_ptrn++ ) ,    \
  161         *((type *)((pvar).va_item)) )
  162 
  163 /* what a mess! */
  164 #endif  /* defined(multimax) && defined(KERNEL) */
  165 
  166 #if i860
  167 #include <i860/varargs.h>       /* PGI vs. Greenhills */
  168 #endif
  169 
  170 #ifdef m88k
  171 #include <motorola/m88k/va-m88k.h>
  172 #else
  173 #ifdef luna88k
  174 #include <motorola/m88k/va-m88k.h>
  175 #endif
  176 #endif
  177 
  178 #ifdef sparc
  179 #include <sun4/varargs.h>  /* built in varargs when using sun4 compiler */
  180 #endif
  181 
  182 #if     alpha
  183 #include <alpha/varargs.h>
  184 #endif
  185 
  186 #endif _SYS_VARARGS_H_

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