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utils: Add helper macros to read variadic arguments into local variables

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This commit is contained in:
Tobias Brunner
2017-05-26 13:56:44 +02:00
parent 0da10b73ad
commit 5297c65398
1 changed files with 46 additions and 2 deletions
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src/libstrongswan/utils/utils.h
+46 -2
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@@ -1,7 +1,7 @@
/*
* Copyright (C) 2008-2015 Tobias Brunner
* Copyright (C) 2008-2017 Tobias Brunner
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
* HSR Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -28,6 +28,7 @@
#include <stddef.h>
#include <sys/time.h>
#include <string.h>
#include <stdarg.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
@@ -140,6 +141,49 @@ void utils_deinit();
#define _VA_ARGS_DISPATCH(func, num) __VA_ARGS_DISPATCH(func, num)
#define __VA_ARGS_DISPATCH(func, num) func ## num
/**
* Assign variadic arguments to the given variables.
*
* @note The order and types of the variables are significant and must match the
* variadic arguments passed to the function that calls this macro exactly.
*
* @param last the last argument before ... in the function that calls this
* @param ... variable names
*/
#define VA_ARGS_GET(last, ...) ({ \
va_list _va_args_get_ap; \
va_start(_va_args_get_ap, last); \
_VA_ARGS_GET_ASGN(__VA_ARGS__) \
va_end(_va_args_get_ap); \
})
/**
* Assign variadic arguments from a va_list to the given variables.
*
* @note The order and types of the variables are significant and must match the
* variadic arguments passed to the function that calls this macro exactly.
*
* @param list the va_list variable in the function that calls this
* @param ... variable names
*/
#define VA_ARGS_VGET(list, ...) ({ \
va_list _va_args_get_ap; \
va_copy(_va_args_get_ap, list); \
_VA_ARGS_GET_ASGN(__VA_ARGS__) \
va_end(_va_args_get_ap); \
})
#define _VA_ARGS_GET_ASGN(...) VA_ARGS_DISPATCH(_VA_ARGS_GET_ASGN, __VA_ARGS__)(__VA_ARGS__)
#define _VA_ARGS_GET_ASGN1(v1) __VA_ARGS_GET_ASGN(v1)
#define _VA_ARGS_GET_ASGN2(v1,v2) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2)
#define _VA_ARGS_GET_ASGN3(v1,v2,v3) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2) \
__VA_ARGS_GET_ASGN(v3)
#define _VA_ARGS_GET_ASGN4(v1,v2,v3,v4) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2) \
__VA_ARGS_GET_ASGN(v3) __VA_ARGS_GET_ASGN(v4)
#define _VA_ARGS_GET_ASGN5(v1,v2,v3,v4,v5) __VA_ARGS_GET_ASGN(v1) __VA_ARGS_GET_ASGN(v2) \
__VA_ARGS_GET_ASGN(v3) __VA_ARGS_GET_ASGN(v4) __VA_ARGS_GET_ASGN(v5)
#define __VA_ARGS_GET_ASGN(v) v = va_arg(_va_args_get_ap, typeof(v));
/**
* Macro to allocate a sized type.
*/