Function cg_read

cg.c:35–78

}

static int
cg_read(const char *attr, char *buf)
{
  int result = 0;
  int maybe = 0;
  if (attr[0] == '?')
    {
      attr++;
      maybe = 1;
    }

  char path[PATH_MAX];
  cg_makepath(path, sizeof(path), attr);

  int fd = open(path, O_RDONLY);
  if (fd < 0)
    {
      if (maybe)
	goto fail;
      die("Cannot read %s: %m", path);
    }

  int n = read(fd, buf, CG_BUFSIZE);
  if (n < 0)
    {
      if (maybe)
	goto fail_close;
      die("Cannot read %s: %m", path);
    }
  if (n >= CG_BUFSIZE - 1)
    die("Attribute %s too long", path);
  if (n > 0 && buf[n-1] == '\n')
    n--;
  buf[n] = 0;

  if (verbose > 1)
    msg("CG: Read %s = <%s>\n", attr, buf);

  result = 1;
fail_close:
  close(fd);
fail:
  return result;
}

static void __attribute__((format(printf,2,3)))
cg_write(const char *attr, const char *fmt, ...)