+int write_file(int f,char *buf,int len)
+{
+ int ret = 0;
+
+ if (!sparse_files)
+ return write(f,buf,len);
+
+ while (len>0) {
+ int len1 = MIN(len, SPARSE_WRITE_SIZE);
+ int r1 = write_sparse(f, buf, len1);
+ if (r1 <= 0) {
+ if (ret > 0) return ret;
+ return r1;
+ }
+ len -= r1;
+ buf += r1;
+ ret += r1;
+ }
+ return ret;