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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.
*/
/**
* @defgroup printf_hook printf_hook
* @{ @ingroup utils
*/
#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 struct printf_hook_data_t printf_hook_data_t;
typedef enum printf_hook_argtype_t printf_hook_argtype_t;
#if !defined(USE_VSTR) && \
!defined(HAVE_PRINTF_FUNCTION) && \
!defined(HAVE_PRINTF_SPECIFIER)
/* assume newer glibc register_printf_specifier if none given */
#define HAVE_PRINTF_SPECIFIER
#endif
#if !defined(USE_VSTR) && \
(defined(HAVE_PRINTF_FUNCTION) || defined(HAVE_PRINTF_SPECIFIER))
#include <stdio.h>
#include <printf.h>
enum printf_hook_argtype_t {
PRINTF_HOOK_ARGTYPE_END = -1,
PRINTF_HOOK_ARGTYPE_INT = PA_INT,
PRINTF_HOOK_ARGTYPE_POINTER = PA_POINTER,
};
/**
* Data to pass to a printf hook.
*/
struct printf_hook_data_t {
/**
* Output FILE stream
*/
FILE *stream;;
};
/**
* Helper macro to be used in printf hook callbacks.
*/
#define print_in_hook(data, fmt, ...) ({\
ssize_t _written = fprintf(data->stream, fmt, ##__VA_ARGS__);\
if (_written < 0)\
{\
_written = 0;\
}\
_written;\
})
#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_asprintf(char **str, 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);
int vstr_wrapper_vasprintf(char **str, const char *format, va_list ap);
#ifdef printf
#undef printf
#endif
#ifdef fprintf
#undef fprintf
#endif
#ifdef sprintf
#undef sprintf
#endif
#ifdef snprintf
#undef snprintf
#endif
#ifdef asprintf
#undef asprintf
#endif
#ifdef vprintf
#undef vprintf
#endif
#ifdef vfprintf
#undef vfprintf
#endif
#ifdef vsprintf
#undef vsprintf
#endif
#ifdef vsnprintf
#undef vsnprintf
#endif
#ifdef vasprintf
#undef vasprintf
#endif
#define printf vstr_wrapper_printf
#define fprintf vstr_wrapper_fprintf
#define sprintf vstr_wrapper_sprintf
#define snprintf vstr_wrapper_snprintf
#define asprintf vstr_wrapper_asprintf
#define vprintf vstr_wrapper_vprintf
#define vfprintf vstr_wrapper_vfprintf
#define vsprintf vstr_wrapper_vsprintf
#define vsnprintf vstr_wrapper_vsnprintf
#define vasprintf vstr_wrapper_vasprintf
/**
* Data to pass to a printf hook.
*/
struct printf_hook_data_t {
/**
* Base to append printf to
*/
Vstr_base *base;
/**
* Position in base to write to
*/
size_t pos;
};
/**
* Wrapper around vstr_add_vfmt(), avoids having to link all users of
* print_in_hook() against libvstr.
*
* @param base Vstr_string to add string to
* @param pos position to write to
* @param fmt format string
* @param ... arguments
* @return number of characters written
*/
size_t vstr_print_in_hook(struct Vstr_base *base, size_t pos, const char *fmt,
...);
/**
* Helper macro to be used in printf hook callbacks.
*/
#define print_in_hook(data, fmt, ...) ({\
size_t _written; \
_written = vstr_print_in_hook(data->base, data->pos, fmt, ##__VA_ARGS__);\
data->pos += _written;\
_written;\
})
#endif
/**
* Callback function type for printf hooks.
*
* @param data hook data, to pass to print_in_hook()
* @param spec format specifier
* @param args arguments array
* @return number of characters written
*/
typedef int (*printf_hook_function_t)(printf_hook_data_t *data,
printf_hook_spec_t *spec,
const void *const *args);
/**
* 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;
/**
* TRUE if a '+' was used in the format specifier
*/
int plus;
/**
* 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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