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/*
* Copyright (C) 2009 Tobias Brunner
* Copyright (C) 2006-2008 Martin Willi
* 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
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* $Id: printf_hook.h 5003 2009-03-24 17:43:01Z martin $
*/
/**
* @defgroup printf_hook printf_hook
* @{ @ingroup libstrongswan
*/
#ifndef PRINTF_HOOK_H_
#define PRINTF_HOOK_H_
typedef struct printf_hook_t printf_hook_t;
typedef struct printf_hook_spec_t printf_hook_spec_t;
typedef enum printf_hook_argtype_t printf_hook_argtype_t;
#ifdef HAVE_PRINTF_HOOKS
#include <printf.h>
enum printf_hook_argtype_t {
PRINTF_HOOK_ARGTYPE_END = PA_LAST,
PRINTF_HOOK_ARGTYPE_INT = PA_INT,
PRINTF_HOOK_ARGTYPE_POINTER = PA_POINTER,
};
#else
#include <vstr.h>
enum printf_hook_argtype_t {
PRINTF_HOOK_ARGTYPE_END = VSTR_TYPE_FMT_END,
PRINTF_HOOK_ARGTYPE_INT = VSTR_TYPE_FMT_INT,
PRINTF_HOOK_ARGTYPE_POINTER = VSTR_TYPE_FMT_PTR_VOID,
};
/**
* Redefining printf and alike
*/
#include <stdio.h>
#include <stdarg.h>
int vstr_wrapper_printf(const char *format, ...);
int vstr_wrapper_fprintf(FILE *stream, const char *format, ...);
int vstr_wrapper_sprintf(char *str, const char *format, ...);
int vstr_wrapper_snprintf(char *str, size_t size, const char *format, ...);
int vstr_wrapper_vprintf(const char *format, va_list ap);
int vstr_wrapper_vfprintf(FILE *stream, const char *format, va_list ap);
int vstr_wrapper_vsprintf(char *str, const char *format, va_list ap);
int vstr_wrapper_vsnprintf(char *str, size_t size, const char *format, va_list ap);
#define printf vstr_wrapper_printf
#define fprintf vstr_wrapper_fprintf
#define sprintf vstr_wrapper_sprintf
#define snprintf vstr_wrapper_snprintf
#define vprintf vstr_wrapper_vprintf
#define vfprintf vstr_wrapper_vfprintf
#define vsprintf vstr_wrapper_vsprintf
#define vsnprintf vstr_wrapper_vsnprintf
#endif
/**
* Callback function type for printf hooks.
*
* @param dst destination buffer
* @param len length of the buffer
* @param spec format specifier
* @param args arguments array
* @return number of characters written
*/
typedef int (*printf_hook_function_t)(char *dst, size_t len,
printf_hook_spec_t *spec,
const void *const *args);
/**
* Helper macro to be used in printf hook callbacks.
* buf and buflen get modified.
*/
#define print_in_hook(buf, buflen, fmt, ...) ({\
int _written = snprintf(buf, buflen, fmt, ##__VA_ARGS__);\
if (_written < 0 || _written >= buflen)\
{\
_written = buflen - 1;\
}\
buf += _written;\
buflen -= _written;\
_written;\
})
/**
* Properties of the format specifier
*/
struct printf_hook_spec_t {
/**
* TRUE if a '#' was used in the format specifier
*/
int hash;
/**
* TRUE if a '-' was used in the format specifier
*/
int minus;
/**
* The width as given in the format specifier.
*/
int width;
};
/**
* Printf handler management.
*/
struct printf_hook_t {
/**
* Register a printf handler.
*
* @param spec printf hook format character
* @param hook hook function
* @param ... list of PRINTF_HOOK_ARGTYPE_*, MUST end with PRINTF_HOOK_ARGTYPE_END
*/
void (*add_handler)(printf_hook_t *this, char spec,
printf_hook_function_t hook, ...);
/**
* Destroy a printf_hook instance.
*/
void (*destroy)(printf_hook_t *this);
};
/**
* Create a printf_hook instance.
*/
printf_hook_t *printf_hook_create();
#endif /** PRINTF_HOOK_H_ @}*/
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