xrxs/universe.c

#include <u.h>
#include <libc.h>
#include <stdio.h>
#include "util.h"
#include "universe.h"

Universe* create_universe() {
  int i;
  Universe* self = malloc(sizeof(Universe));
  for (i = 0; i < 256; i++) {
    self->atoms[i] = nil;
  }
  return self;
}

Universe* parse_universe(char* realm_name) {
  char path[64] = {0};
  char buf[256] = {0};
  char name[16] = {0};
  char value[64] = {0};
  FILE* f;
  Atom* a;
  Universe* self;

  scat(path, "realms/");
  scat(path, realm_name);
  scat(path, "/universe");

  f = fopen(path, "r");
  if (f != nil) {
    self = malloc(sizeof(Universe));
    while (fgets(buf, 256, f) != nil) {
      sscanf(buf, "%16s = %64s", name, value);
      a = malloc(sizeof(Atom));
      scpy(name, a->name, 16);
      scpy(value, a->value, 64);
      a->next = nil;
      set_atom(self, a);
    }
    fclose(f);
    return self;
  }
  return nil;
}

void save_universe(Universe* self, char* realm_name) {
  char path[64] = {0};
  FILE* f;
  Atom* a;
  int i;

  scat(path, "realms/");
  scat(path, realm_name);
  scat(path, "/universe");

  f = fopen(path, "w");
  if (f != nil) {
    for (i = 0; i < 256; i++) {
      a = self->atoms[i];
      while (a != nil) {
        fprintf(f, "%s = %s", a->name, a->value);
        a = a->next;
      }
    }
    fclose(f);
  }
}

void set_atom(Universe* self, Atom* atom) {
  uvlong i = hash(atom->name, 256);
  Atom* a = self->atoms[i];
  while (a != nil) {
    a = a->next;
  }
  a = atom;
  atom->next = nil;
}

Atom* get_atom(Universe* self, char* name) {
  uvlong i = hash(name, 256);
  Atom* a = self->atoms[i];
  while (a != nil && !scmp(a->name, name)) {
    a = a->next;
  }
  return a;
}

void destroy_universe(Universe* self) {
  int i;
  Atom* a;
  Atom* next;

  if (self != nil) {
    for (i = 0; i < 256; i++) {
      a = self->atoms[i];
      while (a != nil) {
        next = a->next;
        free(a);
        a = next;
      }
    }
    free(self);
    self = nil;
  }
}