Created
April 26, 2012 17:09
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Primitive try/catch Exception Handling in C
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| #include <stdio.h> | |
| #include <setjmp.h> | |
| struct Exception { | |
| jmp_buf jb; | |
| int code; | |
| }; | |
| /* Definitely not thread-safe... But we don't care :-) */ | |
| struct Exception *cur_ex_ptr = NULL; | |
| #define try(in_ex) {\ | |
| (in_ex).code = 0;\ | |
| cur_ex_ptr = &(in_ex);\ | |
| } if (!setjmp((in_ex).jb)) | |
| #define catch(in_arg) else if (in_arg) | |
| #define raise(in_code) {\ | |
| if (cur_ex_ptr != NULL) {\ | |
| cur_ex_ptr->code = in_code;\ | |
| jmp_buf *tmp = &cur_ex_ptr->jb;\ | |
| cur_ex_ptr = NULL;\ | |
| longjmp((*tmp), in_code);\ | |
| }\ | |
| } | |
| void nested_func() | |
| { | |
| // Oops, this function raises an exception | |
| raise(1); | |
| } | |
| int main(int argc, char **argv) | |
| { | |
| struct Exception ex; | |
| try (ex) { | |
| printf("Try Block 1\n"); | |
| } catch (ex.code > 0) { | |
| printf("This is never seen\n"); | |
| } | |
| try (ex) { | |
| printf("Try Block 2\n"); | |
| nested_func(); | |
| } catch (ex.code > 0) { | |
| printf("Exception Raised: %d\n", ex.code); | |
| } | |
| return 0; | |
| } |
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To see the macros expanded, run (clang or gcc):
clang -E gistfile1.c