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91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/*
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* @(#) stdarg.h 1.4 93/06/18 22:29:44
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*
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* Sample stdarg.h file for use with the unproto filter.
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*
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* This file serves two purposes.
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*
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* 1 - On systems that do not have a /usr/include/stdarg.h file, it should be
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* included by C source files that implement ANSI-style variadic functions.
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* Ultrix 4.[0-2] comes with stdarg.h but still needs the one that is
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* provided with the unproto filter.
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*
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* 2 - To configure the unprototyper itself. If the _VA_ALIST_ macro is
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* defined, its value will appear in the place of the "..." at the end of
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* argument lists of variadic function *definitions* (not declarations).
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* Some compilers (such as Greenhills m88k) have a non-empty va_dcl
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* definition in the system header file varargs.h. If that is the case,
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* define "_VA_DCL_" with the same value as va_dcl. If _VA_DCL_ is defined,
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* the unprototyper will emit its value just before the opening "{".
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*
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* Compilers that always pass arguments via the stack can use the default code
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* at the end of this file (this usually applies for the vax, mc68k and
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* 80*86 architectures).
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*
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* Special tricks are needed for compilers that pass some or all function
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* arguments via registers. Examples of the latter are given for the mips
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* and sparc architectures. Usually the compiler special-cases an argument
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* declaration such as "va_alist" or "__builtin_va_alist". For inspiration,
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* see the local /usr/include/varargs.h file.
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*
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* You can use the varargs.c program provided with the unproto package to
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* verify that the stdarg.h file has been set up correctly.
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*/
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#ifdef sparc /* tested with SunOS 4.1.1 */
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#define _VA_ALIST_ "__builtin_va_alist"
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typedef char *va_list;
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#define va_start(ap, p) (ap = (char *) &__builtin_va_alist)
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#define va_arg(ap, type) ((type *) __builtin_va_arg_incr((type *) ap))[0]
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#define va_end(ap)
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#else
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#ifdef mips /* tested with Ultrix 4.0 and 4.2 */
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#define _VA_ALIST_ "va_alist"
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#include "/usr/include/stdarg.h"
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#else
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#ifdef m88k /* Motorola SYSTEM V/88 R32V3 */
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#define _VA_ALIST_ "va_alist"
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#define _VA_DCL_ "va_type va_alist;"
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typedef struct _va_struct {
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int va_narg;
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int *va_stkaddr;
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int *va_iregs;
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} va_list;
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#define va_start(ap, p) \
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((ap).va_narg=(int *)&va_alist-va_stkarg, \
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(ap).va_stkaddr=va_stkarg, \
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(ap).va_iregs=(int *)va_intreg)
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#define va_end(p)
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#if defined(LittleEndian)
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#define va_arg(p,mode) \
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(*(mode *)_gh_va_arg(&p, va_align(mode), va_regtyp(mode), sizeof(mode)))
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#else /* defined(LittleEndian) */
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#define va_arg(p,mode) ( \
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(p).va_narg += ((p).va_narg & (va_align(mode) == 8)) + \
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(sizeof(mode)+3)/4, \
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((mode *)((va_regtyp(mode) && (p).va_narg <= 8 ? \
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(p).va_iregs: \
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(p).va_stkaddr) + (p).va_narg))[-1])
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#endif /* defined(LittleEndian) */
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#else
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#ifdef hpux
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#include <stdarg.h>
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#else /* vax, mc68k, 80*86 */
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typedef char *va_list;
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#define va_start(ap, p) (ap = (char *) (&(p)+1))
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#define va_arg(ap, type) ((type *) (ap += sizeof(type)))[-1]
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#define va_end(ap)
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#endif /* hpux */
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#endif /* m88k */
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#endif /* mips */
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#endif /* sparc */
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