forked from osmocom/wireshark
141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
#ifndef __EXCEPTIONS_H__
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#define __EXCEPTIONS_H__
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#ifndef XCEPT_H
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#include "except.h"
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#endif
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/* Ethereal has only one exception group, to make these macros simple */
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#define XCEPT_GROUP_ETHEREAL 1
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/* Ethereal's exceptions */
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#define BoundsError 1 /* Index is out of range */
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#define ReportedBoundsError 2 /* Index is beyond reported length (not cap_len) */
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/* Usage:
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*
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* TRY {
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* code;
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* }
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*
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* CATCH(exception) {
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* code;
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* }
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*
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* CATCH2(exception1, exception2) {
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* code;
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* }
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*
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* CATCH_ALL {
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* code;
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* }
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*
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* FINALLY {
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* code;
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* }
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*
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* ENDTRY;
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*
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* ********* Never use 'goto' or 'return' inside the TRY, CATCH, CATCH_ALL,
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* ********* or FINALLY blocks. Execution must proceed through ENDTRY before
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* ********* branching out.
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*
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* This is really something like:
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*
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* {
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* x = setjmp()
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* if (x == 0) {
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* <TRY code>
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* }
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* else if (x == 1) {
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* <CATCH(1) code>
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* }
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* else if (x == 2) {
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* <CATCH(2) code>
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* }
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* else if (x == 3 || x == 4) {
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* <CATCH2(3,4) code>
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* }
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* else {
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* <CATCH_ALL code> {
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* }
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* <FINALLY code>
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* }<ENDTRY tag>
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*
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* All CATCH's must precede a CATCH_ALL.
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* FINALLY must occur after any CATCH or CATCH_ALL.
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* ENDTRY marks the end of the TRY code.
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* TRY and ENDTRY are the mandatory parts of a TRY block.
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* CATCH, CATCH_ALL, and FINALLY are all optional (although
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* you'll probably use at least one, otherwise why "TRY"?)
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*
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* GET_MESSAGE returns string ptr to exception message
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* when exception is thrown via THROW_MESSAGE()
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*
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* To throw/raise an exception.
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*
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* THROW(exception)
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* RETHROW rethrow the caught exception
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*
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* A cleanup callback is a function called in case an exception occurs
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* and is not caught. It should be used to free any dynamically-allocated data.
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* A pop or call_and_pop should occur at the same statement-nesting level
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* as the push.
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*
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* CLEANUP_CB_PUSH(func, data)
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* CLEANUP_CB_POP
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* CLEANUP_CB_CALL_AND_POP
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*/
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#define TRY \
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{\
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except_t *exc; \
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static const except_id_t catch_spec[] = { \
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{ XCEPT_GROUP_ETHEREAL, XCEPT_CODE_ANY } }; \
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except_try_push(catch_spec, 1, &exc); \
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if (exc == 0) { \
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/* user's code goes here */
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#define ENDTRY \
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} \
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except_try_pop();\
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}
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#define CATCH(x) \
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} \
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else if (exc->except_id.except_code == (x)) { \
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/* user's code goes here */
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#define CATCH2(x,y) \
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} \
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else if (exc->except_id.except_code == (x) || exc->except_id.except_code == (y)) { \
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/* user's code goes here */
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#define CATCH_ALL \
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} \
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else { \
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/* user's code goes here */
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#define FINALLY \
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} \
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{ \
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/* user's code goes here */
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#define THROW(x) \
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except_throw(XCEPT_GROUP_ETHEREAL, (x), "XCEPT_GROUP_ETHEREAL")
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#define THROW_MESSAGE(x, y) \
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except_throw(XCEPT_GROUP_ETHEREAL, (x), (y))
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#define GET_MESSAGE except_message(exc)
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#define RETHROW except_rethrow(exc)
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#define CLEANUP_CB_PUSH(x,y) except_cleanup_push((x),(y)
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#define CLEANUP_CB_POP except_cleanup_push(0)
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#define CLEANUP_CB_CALL_AND_POP except_cleanup_push(1)
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#endif /* __EXCEPTIONS_H__ */
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