diff options
Diffstat (limited to 'Src/system.h')
-rw-r--r-- | Src/system.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/Src/system.h b/Src/system.h index 340f4693b..2f3dcd32a 100644 --- a/Src/system.h +++ b/Src/system.h @@ -153,8 +153,48 @@ char *alloca _((size_t)); # include <stdlib.h> #endif +/* + * Stuff with variable arguments. We use definitions to make the + * same code work with varargs (the original K&R-style, just to + * be maximally compatible) and stdarg (which all modern systems + * should have). + * + * Ideally this should somehow be merged with the tricks performed + * with "_" in makepro.awk, but I don't understand makepro.awk. + * Currently we simply rely on the fact that makepro.awk has been + * hacked to leave alone argument lists that already contains VA_ALIST + * except for removing the VA_DCL and turning VA_ALIST into VA_ALIST_PROTO. + */ #ifdef HAVE_STDARG_H # include <stdarg.h> +# define VA_ALIST1(x) x, ... +# define VA_ALIST2(x,y) x, y, ... +# define VA_ALIST_PROTO1(x) VA_ALIST1(x) +# define VA_ALIST_PROTO2(x,y) VA_ALIST2(x,y) +# define VA_DCL +# define VA_DEF_ARG(x) +# define VA_START(ap,x) va_start(ap, x) +# define VA_GET_ARG(ap,x,t) +#else +# if HAVE_VARARGS_H +# include <varargs.h> +# define VA_ALIST1(x) va_alist +# define VA_ALIST2(x,y) va_alist +/* + * In prototypes, assume K&R form and remove the variable list. + * This is about the best we can do without second-guessing the way + * varargs works on this system. The _ trick should be able to + * do this for us but we've turned it off here. + */ +# define VA_ALIST_PROTO1(x) +# define VA_ALIST_PROTO2(x,y) +# define VA_DCL va_dcl +# define VA_DEF_ARG(x) x +# define VA_START(ap,x) va_start(ap); +# define VA_GET_ARG(ap,x,t) (x = va_arg(ap, t)) +# else +# error "Your system has neither stdarg.h or varargs.h." +# endif #endif #ifdef HAVE_ERRNO_H |