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authorErik Andersen <andersen@codepoet.org>2000-05-14 04:16:35 +0000
committerErik Andersen <andersen@codepoet.org>2000-05-14 04:16:35 +0000
commit64bc6412188b141c010ac3b8e813b837dd991e80 (patch)
treeffa12b79ea4b13191754f54b872eb1a4f9e3a04b /include/stdarg.h
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+ /*
+ * @(#) stdarg.h 1.2 91/11/30 21:10:39
+ *
+ * Sample stdarg.h file for use with the unproto filter.
+ *
+ * This file serves two purposes.
+ *
+ * 1 - As an include file for use with ANSI-style C source that implements
+ * variadic functions.
+ *
+ * 2 - To configure the unproto filter itself. If the _VA_ALIST_ macro is
+ * defined, its value will appear in the place of the "..." in argument
+ * lists of variadic function *definitions* (not declarations).
+ *
+ * Compilers that pass arguments via the stack can use the default code at the
+ * end of this file (this usually applies for the VAX, MC68k and 80*86
+ * architectures).
+ *
+ * RISC-based systems often need special tricks. An example of the latter is
+ * given for the SPARC architecture. Read your /usr/include/varargs.h for
+ * more information.
+ *
+ * You can use the varargs.c program provided with the unproto package to
+ * verify that the stdarg.h file has been set up correctly.
+ */
+
+#ifndef __STDARG_H
+#define __STDARG_H
+
+#ifdef sparc
+# define _VA_ALIST_ "__builtin_va_alist"
+ typedef char *va_list;
+# define va_start(ap, p) (ap = (char *) &__builtin_va_alist)
+# define va_arg(ap, type) ((type *) __builtin_va_arg_incr((type *) ap))[0]
+# define va_end(ap)
+#else /* vax, mc68k, 80*86 */
+ typedef char *va_list;
+# define va_start(ap, p) (ap = (char *) (&(p)+1))
+# define va_arg(ap, type) ((type *) (ap += sizeof(type)))[-1]
+# define va_end(ap)
+#endif
+
+#endif /* __STDARG_H */
+
+#if __FIRST_ARG_IN_AX__
+#error First arg is in a register, stdarg.h cannot take its address
+#endif