print libseccomp hash table

print_htbl.c

#include <stdarg.h>
#include <stdio.h>
static void print_line(int indent_level, const char *format, ...)
{
        int i;

        for (i = 0; i < indent_level; i++)
                fprintf(stdout, " ");

        va_list(args);
        va_start(args, format);
        vfprintf(stdout, format, args);
        va_end(args);
}

#define INDENT 2
static void print_blk(int indent_level, struct bpf_blk *b_cur)
{
        int blk_cnt = 0;

        print_line(indent_level, "----bpf_blk---- %p\n", b_cur);
        print_line(indent_level + INDENT,
                "blk_cnt = %d blk_alloc = %d hash = 0x%lx\n",
                b_cur->blk_cnt, b_cur->blk_alloc,
                b_cur->hash);

        for (blk_cnt = 0; blk_cnt < b_cur->blk_cnt; blk_cnt++) {
                print_line(indent_level + INDENT,
                        "----instr %d----\n", blk_cnt);
                print_line(indent_level + INDENT * 2, "op = 0x%x\n",
                        b_cur->blks[blk_cnt].op);
                print_line(indent_level + INDENT * 2,
                        "jt type = %d hash = 0x%lx\n",
                        b_cur->blks[blk_cnt].jt.type,
                        b_cur->blks[blk_cnt].jt.tgt.hash);
                print_line(indent_level + INDENT * 2,
                        "jf type = %d hash = 0x%lx\n",
                        b_cur->blks[blk_cnt].jf.type,
                        b_cur->blks[blk_cnt].jf.tgt.hash);
                print_line(indent_level + INDENT * 2, 
                        "k type = %d hash = 0x%lx\n",
                        b_cur->blks[blk_cnt].k.type,
                        b_cur->blks[blk_cnt].k.tgt.hash);
        }

        print_line(indent_level + INDENT * 2, "lvl_prv = %p lvl_nxt = %p\n",
                b_cur->lvl_prv, b_cur->lvl_nxt);
        print_line(indent_level + INDENT * 2, "prev = %p next = %p\n",
                b_cur->prev, b_cur->next);
}

static void print_hash_bkt(int indent_level, struct bpf_hash_bkt const *hbkt)
{
        if (hbkt == NULL)
                return;

        print_line(indent_level, "----hash bucket---- %p\n", hbkt);
        print_line(indent_level + INDENT,
                   "blk = %p next = %p found = %d\n",
                   hbkt->blk, hbkt->next, hbkt->found);
        if (hbkt->blk != NULL)
                print_blk(indent_level + INDENT, hbkt->blk);
}

void print_htbl(struct bpf_state *state)
{
        struct bpf_hash_bkt *h_iter;
        unsigned int bkt; 

        print_line(0, "----hash table----\n");
        for (bkt = 0; bkt < _BPF_HASH_SIZE; bkt++) {
                if (state->htbl[bkt]) {
                        h_iter = state->htbl[bkt & _BPF_HASH_MASK];
                        print_hash_bkt(INDENT, h_iter);
                }
        }
}