mirror of
https://github.com/cjdelisle/cjdns
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64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
/* vim: set expandtab ts=4 sw=4: */
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/*
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* You may redistribute this program and/or modify it under the terms of
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* the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef Jmp_H
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#define Jmp_H
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#include "exception/Except.h"
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#include <setjmp.h>
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/**
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* setjmp based exception handler.
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*
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* struct Jmp jmp;
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* Jmp_try(jmp) {
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* Do_somethingDangerous(&jmp.handler);
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* } Jmp_catch {
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* printf("failed %d %s", jmp.code, jmp.message);
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* }
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*
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* Provides an easy way to implement the most basic try/catch functionality.
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* the jmp structure must not be used for anything outside of the try block,
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* calling jmp.handler.exception outside of a try block is undefined behavior.
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*/
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struct Jmp {
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/** The exception handler which will trigger the entry into the catch block. */
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struct Except handler;
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/** The exception message if in the catch block, otherwise undefined. */
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char* message;
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/** Internal setjmp buffer. */
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jmp_buf buf;
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};
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/** Internal callback, this should not be called directly. */
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Gcc_NORETURN
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static void Jmp_callback(char* message, struct Except* handler)
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{
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struct Jmp* jmp = (struct Jmp*) handler;
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jmp->message = message;
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longjmp(jmp->buf, 1);
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}
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#define Jmp_try(jmp) \
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jmp.handler.exception = Jmp_callback; \
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if (!setjmp(jmp.buf))
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// CHECKFILES_IGNORE squigly bracket will be added by the caller.
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#define Jmp_catch else
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#endif
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