a.c

#include <stdio.h>
#include <setjmp.h>

static jmp_buf buf1, buf2;

#define FOR(VAR, START, FINISH) if (!setjmp(buf1)) { for (int (VAR) = START; (VAR) <= (FINISH); (VAR)++) {
#define NEXT if (!setjmp(buf2)) continue
#define ENDFOR longjmp(buf1, 1); } longjmp(buf2, 1); }


int go(int finish) {
        printf("Finish: %d\n", finish);
        FOR(i, 1, finish)
                if (i % 2) {
                        NEXT;
                        puts("odd exit");
                } else {
                        NEXT;
                        puts("even exit");
                }
        ENDFOR
}

int main() {
        go(7);
        go(8);
}