blob: d51c24937811583a7fefafe22b2d2eb1396a0b11 [file] [log] [blame]
/* go-strslice.c -- the go string slice function.
Copyright 2009 The Go Authors. All rights reserved.
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file. */
#include "runtime.h"
__go_string_slice (String s, intgo start, intgo end)
intgo len;
String ret;
len = s.len;
if (end == -1)
end = len;
if (start > len || end < start || end > len)
runtime_panicstring ("string index out of bounds");
ret.len = end - start;
// If the length of the new string is zero, the str field doesn't
// matter, so just set it to nil. This avoids the problem of
// s.str + start pointing just past the end of the string,
// which may keep the next memory block alive unnecessarily.
if (ret.len == 0)
ret.str = nil;
ret.str = s.str + start;
return ret;