src/util/map.c


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#include <fcntl.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>

#include "map.h"

struct map *open_map(const char *fname) {
  int fd = open(fname, O_RDONLY);

  struct stat sb;
  if (fstat(fd, &sb) == -1) {
    fprintf(stderr, "Kon bestand niet lezen\n");
    return NULL;
  }

  char *addr = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
  if (addr == MAP_FAILED) {
    fprintf(stderr, "Kon bestand niet projecteren in geheugen\n");
    return NULL;
  }

  struct map *res = calloc(1, sizeof(struct map));
  res->addr = addr;
  res->end = addr + sb.st_size;
  res->sb = sb;
  res->fd = fd;
  return res;
}

void close_map(struct map *m) {
  munmap(m->addr, m->sb.st_size);
  close(m->fd);
  free(m);
}