mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-13 03:29:50 +00:00
31 lines
849 B
C
31 lines
849 B
C
/* 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"
|
|
|
|
String
|
|
__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;
|
|
else
|
|
ret.str = s.str + start;
|
|
return ret;
|
|
}
|