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/*
* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*
* $Id: exc.h,v 1.23 2001/06/07 20:04:53 ca Exp $
*/
/*
** libsm exception handling
** See libsm/exc.html for documentation.
*/
#ifndef SM_EXC_H
# define SM_EXC_H
#include <sm/setjmp.h>
#include <sm/io.h>
#include <sm/gen.h>
#include <sm/assert.h>
typedef struct sm_exc SM_EXC_T;
typedef struct sm_exc_type SM_EXC_TYPE_T;
typedef union sm_val SM_VAL_T;
/*
** Exception types
*/
extern const char SmExcTypeMagic[];
struct sm_exc_type
{
const char *sm_magic;
const char *etype_category;
const char *etype_argformat;
void (*etype_print) __P((SM_EXC_T *, SM_FILE_T *));
const char *etype_printcontext;
};
extern const SM_EXC_TYPE_T SmEtypeOs;
extern const SM_EXC_TYPE_T SmEtypeErr;
extern void
sm_etype_printf __P((
SM_EXC_T *_exc,
SM_FILE_T *_stream));
/*
** Exception objects
*/
extern const char SmExcMagic[];
union sm_val
{
int v_int;
long v_long;
char *v_str;
SM_EXC_T *v_exc;
};
struct sm_exc
{
const char *sm_magic;
size_t exc_refcount;
const SM_EXC_TYPE_T *exc_type;
SM_VAL_T *exc_argv;
};
# define SM_EXC_INITIALIZER(type, argv) \
{ \
SmExcMagic, \
0, \
type, \
argv, \
}
extern SM_EXC_T *
sm_exc_new_x __P((
const SM_EXC_TYPE_T *_type,
...));
extern SM_EXC_T *
sm_exc_addref __P((
SM_EXC_T *_exc));
extern void
sm_exc_free __P((
SM_EXC_T *_exc));
extern bool
sm_exc_match __P((
SM_EXC_T *_exc,
const char *_pattern));
extern void
sm_exc_write __P((
SM_EXC_T *_exc,
SM_FILE_T *_stream));
extern void
sm_exc_print __P((
SM_EXC_T *_exc,
SM_FILE_T *_stream));
extern SM_DEAD(void
sm_exc_raise_x __P((
SM_EXC_T *_exc)));
extern SM_DEAD(void
sm_exc_raisenew_x __P((
const SM_EXC_TYPE_T *_type,
...)));
/*
** Exception handling
*/
typedef void (*SM_EXC_DEFAULT_HANDLER_T) __P((SM_EXC_T *));
extern void
sm_exc_newthread __P((
SM_EXC_DEFAULT_HANDLER_T _handle));
typedef struct sm_exc_handler SM_EXC_HANDLER_T;
struct sm_exc_handler
{
SM_EXC_T *eh_value;
SM_JMPBUF_T eh_context;
SM_EXC_HANDLER_T *eh_parent;
int eh_state;
};
/* values for eh_state */
enum
{
SM_EH_PUSHED = 2,
SM_EH_POPPED = 0,
SM_EH_HANDLED = 1
};
extern SM_EXC_HANDLER_T *SmExcHandler;
# define SM_TRY { SM_EXC_HANDLER_T _h; \
do { \
_h.eh_value = NULL; \
_h.eh_parent = SmExcHandler; \
_h.eh_state = SM_EH_PUSHED; \
SmExcHandler = &_h; \
if (sm_setjmp_nosig(_h.eh_context) == 0) {
# define SM_FINALLY SM_ASSERT(SmExcHandler == &_h); \
} \
if (sm_setjmp_nosig(_h.eh_context) == 0) {
# define SM_EXCEPT(e,pat) } \
if (_h.eh_state == SM_EH_HANDLED) \
break; \
if (_h.eh_state == SM_EH_PUSHED) { \
SM_ASSERT(SmExcHandler == &_h); \
SmExcHandler = _h.eh_parent; \
} \
_h.eh_state = sm_exc_match(_h.eh_value,pat) \
? SM_EH_HANDLED : SM_EH_POPPED; \
if (_h.eh_state == SM_EH_HANDLED) { \
SM_UNUSED(SM_EXC_T *e) = _h.eh_value;
# define SM_END_TRY } \
} while (0); \
if (_h.eh_state == SM_EH_PUSHED) { \
SM_ASSERT(SmExcHandler == &_h); \
SmExcHandler = _h.eh_parent; \
if (_h.eh_value != NULL) \
sm_exc_raise_x(_h.eh_value); \
} else if (_h.eh_state == SM_EH_POPPED) { \
if (_h.eh_value != NULL) \
sm_exc_raise_x(_h.eh_value); \
} else \
sm_exc_free(_h.eh_value); \
}
#endif /* SM_EXC_H */
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