Tooltron

#include "util.h"

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

char *read_file(const char *filename) {

  int fd, len, size, nread;

  char *str;

  fd = open(filename, O_RDONLY);

  if (fd < 0) {

    perror("open");

    return NULL;

  }

  len = 0;

  size = 64;

  str = malloc(size);

  if (!str) {

    close(fd);

    return NULL;

  }

  while (1) {

    nread = read(fd, str+len, size-len);

    len += nread;

    if (len == size) {

      size *= 2;

      str = realloc(str, size);

      if (!str)

        return NULL;

    }

    if (nread == 0) {

      str[len] = '\0';

      close(fd);

      return str;

    } else if (nread < 0) {

      perror("read");

      free(str);

      close(fd);

      return NULL;

    }

  }

}