Initial import
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3be483a237
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13
Makefile
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13
Makefile
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CC ?= clang
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CFLAGS ?= -Weverything -std=c11
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## For C11
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#CFLAGS += -DTRYCATCH_THREAD_LOCAL=_Thread_local
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## For GCC / Clang
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#CFLAGS += -DTRYCATCH_THREAD_LOCAL=__thread
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libtrycatch.a: trycatch.o
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ar cr $@ $<
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example: example.o libtrycatch.a
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${CC} -L. -ltrycatch -o $@ $<
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2
README
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2
README
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This is a small library providing C++-like try/catch for C with almost
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exactly the same syntax, see example.c.
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57
example.c
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57
example.c
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/*
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* Copyright (c) 2014, Jonathan Schleifer <js@webkeks.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include "trycatch.h"
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int
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main()
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{
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try {
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puts("try1");
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try {
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puts("try2");
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} catch (ex) {
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(void)ex;
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puts("this should not be called");
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}
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throw(5);
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} catch (ex) {
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printf("caught %d (should be 5)\n", ex);
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}
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try {
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throw(1);
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return 1;
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} catch (ex) {
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(void)ex;
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}
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return 0;
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}
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73
trycatch.c
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73
trycatch.c
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/*
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* Copyright (c) 2014, Jonathan Schleifer <js@webkeks.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "trycatch.h"
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#ifndef TRYCATCH_THREAD_LOCAL
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# define TRYCATCH_THREAD_LOCAL
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#endif
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static TRYCATCH_THREAD_LOCAL struct trycatch_frame *trycatch_frames = NULL;
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struct trycatch_frame*
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trycatch_frame_push()
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{
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struct trycatch_frame *frame;
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if ((frame = malloc(sizeof(*frame))) == NULL) {
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fputs("Not enough memory to allocate exception frame!\n",
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stderr);
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abort();
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}
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frame->prev = trycatch_frames;
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trycatch_frames = frame;
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return frame;
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}
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void
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trycatch_frame_pop()
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{
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struct trycatch_frame *frame = trycatch_frames;
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trycatch_frames = frame->prev;
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free(frame);
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}
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void _Noreturn
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trycatch_throw(int ex)
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{
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if (trycatch_frames == NULL) {
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fputs("Exception with no handler!\n", stderr);
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abort();
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}
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longjmp(*trycatch_frames->jmpbuf, ex);
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}
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65
trycatch.h
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65
trycatch.h
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/*
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* Copyright (c) 2014, Jonathan Schleifer <js@webkeks.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __TRYCATCH_H__
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#define __TRYCATCH_H__
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#include <setjmp.h>
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#include <stdnoreturn.h>
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#define TRYCATCH_CONCAT2(a, b) a ## b
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#define TRYCATCH_CONCAT(a, b) TRYCATCH_CONCAT2(a, b)
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#ifndef TRYCATCH_NORETURN
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# define TRYCATCH_NORETURN
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#endif
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#define try \
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struct trycatch_frame *TRYCATCH_CONCAT(trycatch_frame, __LINE__); \
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jmp_buf TRYCATCH_CONCAT(trycatch_jmpbuf, __LINE__); \
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TRYCATCH_CONCAT(trycatch_frame, __LINE__) = trycatch_frame_push(); \
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trycatch_ex = setjmp(TRYCATCH_CONCAT(trycatch_jmpbuf, __LINE__)); \
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if (trycatch_ex == 0) \
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TRYCATCH_CONCAT(trycatch_frame, __LINE__)->jmpbuf = \
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&TRYCATCH_CONCAT(trycatch_jmpbuf, __LINE__); \
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if (trycatch_ex == 0)
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#define catch(ex) \
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trycatch_frame_pop(); \
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for (int ex = trycatch_ex; trycatch_ex != 0; trycatch_ex = 0)
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#define throw(ex) trycatch_throw(ex)
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#define rethrow trycatch_throw(trycatch_ex)
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struct trycatch_frame {
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jmp_buf *jmpbuf;
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struct trycatch_frame *prev;
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};
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static int trycatch_ex;
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struct trycatch_frame *trycatch_frame_push(void);
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void trycatch_frame_pop(void);
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void TRYCATCH_NORETURN trycatch_throw(int ex);
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#endif
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