/*
 * stdlib_test — verifies that SDCC's z80.lib stdlib functions (atoi,
 * strtol, rand, qsort, bsearch, abs, ldiv) work in our environment.
 * If they all behave correctly, we can save ourselves the labour of
 * reimplementing them in libc/stdlib.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static int cmp_int(const void *a, const void *b)
{
    int ia = *(const int *)a;
    int ib = *(const int *)b;
    return (ia > ib) - (ia < ib);
}

int main(int argc, char **argv)
{
    /* atoi / strtol */
    int       v_atoi  = atoi("12345");
    long      v_strtol = strtol("-9876", NULL, 10);
    long      v_hex    = strtol("ff", NULL, 16);
    printf("atoi(\"12345\") = %d (expected 12345)\n", v_atoi);
    printf("strtol(\"-9876\",,10) = %ld (expected -9876)\n", v_strtol);
    printf("strtol(\"ff\",,16) = %ld (expected 255)\n", v_hex);

    /* abs / ldiv */
    printf("abs(-7) = %d (expected 7)\n", abs(-7));
    {
        ldiv_t q = ldiv(100L, 7L);
        printf("ldiv(100,7) = {q=%ld, r=%ld} (expected {14, 2})\n",
               q.quot, q.rem);
    }

    /* rand / srand — deterministic with fixed seed */
    srand(42);
    printf("rand x3 (seed 42): %d %d %d\n", rand(), rand(), rand());

    /* qsort */
    {
        int arr[] = { 5, 1, 4, 2, 8, 3, 7, 6, 0, 9 };
        qsort(arr, 10, sizeof(int), cmp_int);
        printf("qsort:");
        for (int i = 0; i < 10; i++) printf(" %d", arr[i]);
        printf(" (expected 0..9 sorted)\n");

        /* bsearch */
        int key = 7;
        int *p = (int *)bsearch(&key, arr, 10, sizeof(int), cmp_int);
        printf("bsearch(7) -> %s (expected found)\n",
               (p && *p == 7) ? "found" : "MISS");
    }

    /* argv-as-int: typical CLI use */
    if (argc > 1) {
        printf("argv[1] as int: %d\n", atoi(argv[1]));
    }

    puts("\nall SDCC stdlib functions reachable.");
    return 0;
}
