Function cg_write

cg.c:80–128

}

static void __attribute__((format(printf,2,3)))
cg_write(const char *attr, const char *fmt, ...)
{
  int maybe = 0;
  if (attr[0] == '?')
    {
      attr++;
      maybe = 1;
    }

  va_list args;
  va_start(args, fmt);

  char buf[CG_BUFSIZE];
  int n = vsnprintf(buf, sizeof(buf), fmt, args);
  if (n >= CG_BUFSIZE)
    die("cg_write: Value for attribute %s is too long", attr);

  if (verbose > 1)
    msg("CG: Write %s = %s", attr, buf);

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

  int fd = open(path, O_WRONLY | O_TRUNC);
  if (fd < 0)
    {
      if (maybe)
	goto fail;
      else
	die("Cannot write %s: %m", path);
    }

  int written = write(fd, buf, n);
  if (written < 0)
    {
      if (maybe)
	goto fail_close;
      else
	die("Cannot set %s to %s: %m", path, buf);
    }
  if (written != n)
    die("Short write to %s (%d out of %d bytes)", path, written, n);

fail_close:
  close(fd);
fail:
  va_end(args);
}

static FILE *cg_fopen(const char *attr)
{