110 lines
2.0 KiB
C
110 lines
2.0 KiB
C
#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#define NAME_SIZE 64
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struct State {
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int counter;
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time_t updated_at;
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char name[NAME_SIZE];
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size_t history_entries;
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};
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static char *names[] = {
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"boingo",
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"barko",
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"flip",
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"dingles",
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"zebra",
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"horus",
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"blendy",
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"kitems",
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"horple",
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NULL,
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};
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char *random_name()
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{
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int i = 0;
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int mod = 0;
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for (i = 0; names[i] != NULL; i++) {
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mod = i;
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}
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return names[random() % mod];
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}
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void tick(FILE *fp, int init)
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{
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struct State *state = malloc(sizeof(struct State));
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if (!state) {
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err(EXIT_FAILURE, "Memory error making State");
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}
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if (init == 0) {
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size_t read = fread(state, sizeof(struct State), 1, fp);
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fprintf(
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stderr,
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"Read %d \"%s\" (%lu byte(s)) from %lu\n",
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state->counter, state->name, sizeof(struct State) * read, state->updated_at
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);
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}
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time_t history[state->history_entries];
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size_t histories_read = fread(&history, sizeof(time_t), state->history_entries, fp);
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state->counter++;
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state->updated_at = time(0);
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strncpy(state->name, random_name(), NAME_SIZE);
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state->history_entries++;
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rewind(fp);
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size_t wrote = fwrite(state, sizeof(struct State), 1, fp);
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fwrite(history, sizeof(time_t), sizeof(history) / sizeof(time_t), fp);
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fwrite(&state->updated_at, sizeof(time_t), 1, fp);
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fprintf(
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stderr,
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"Wrote %d \"%s\" (%lu byte(s)) at %lu (history length=%lu)\n",
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state->counter, state->name, sizeof(struct State) * wrote, state->updated_at,
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state->history_entries
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);
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}
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int main(int argc, char *argv[])
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{
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if (argc < 2) {
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errx(EXIT_FAILURE, "Missing filename argument");
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}
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int random_seed = time(0);
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const char *random_seed_str = getenv("RANDOM_SEED");
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if (random_seed_str) {
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random_seed = atoi(random_seed_str);
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}
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srandom(random_seed);
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int init = 0;
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FILE *fp = fopen(argv[1], "r+");
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if (!fp) {
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fp = fopen(argv[1], "w+");
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init = 1;
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}
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if (!fp) {
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err(EXIT_FAILURE, "Failed to open file");
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}
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tick(fp, init);
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fclose(fp);
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return 0;
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}
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