libgo/runtime/go-strslice.c

   1 /* go-strslice.c -- the go string slice function.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include "go-string.h"
   8 #include "go-panic.h"
   9 #include "runtime.h"
  10 #include "malloc.h"
  11
  12 struct __go_string
  13 __go_string_slice (struct __go_string s, int start, int end)
  14 {
  15   int len;
  16   struct __go_string ret;
  17
  18   len = s.__length;
  19   if (end == -1)
  20     end = len;
  21   if (start > len || end < start || end > len)
  22     __go_panic_msg ("string index out of bounds");
  23   ret.__data = s.__data + start;
  24   ret.__length = end - start;
  25   return ret;
  26 }