teststak.c

/* Test Stack */
#include <stdio.h>
#include <setjmp.h>

static jmp_buf buf;

int recurse1(unsigned int x) {
    unsigned int space[200];
    if (x == 100) {
        printf("Level 100 reached\n");
        return 100;
    }
    if (x > 100) {
        printf("ERROR: Over Level 100!!\n");
        return 100;
    }
    space[x] = recurse1(x + 1);
    if (space[x] != x + 1) {
        printf("ERROR: Mismatched return!!\n");
    }
    return x;
}

int recurse2(unsigned int x) {
    unsigned int space[200];

    if (x == 100) {
        printf("Level 100 reached\n");
        longjmp(buf, 5);
        return 100;
    }
    if (x > 100) {
        printf("ERROR: Over Level 100!!\n");
        longjmp(buf, 5);
        return 100;
    }
    space[50] = x + 1;
    recurse2(space[50]);
    printf("ERROR: longjmp must have failed!!\n");
    return x;
}

int recurse3(unsigned int x) {
    unsigned int space[200];

    if (x == 100) {
        printf("Level 100 reached\n");
        exit(0);
        return 100;
    }
    if (x > 100) {
        printf("ERROR: Over Level 100!!\n");
        exit(5);
        return 100;
    }
    space[50] = x + 1;
    recurse3(space[50]);
    printf("ERROR: exit() must have failed!!\n");
    return x;
}

int main(int argc, char *argv[]) {
    int r;
    printf("GCCLIB Stack Test\n");
    recurse1(0);
    printf("GCCLIB Stack Test - Done\n");

    printf("GCCLIB Stack Test (with longjmp)\n");
    if (!(r = setjmp(buf))) recurse2(0);
    if (r != 5) printf("ERROR: set/longjmp did not return expected rc!!\n");
    printf("GCCLIB Stack Test (with longjmp) - Done\n");

    printf("GCCLIB Stack Test (with exit)\n");
    recurse3(0);
    printf("ERROR - GCCLIB Stack Test (with exit) - should not get here\n");

    return 0;
}