1 /* go-int-to-string.c -- convert an integer to a string in Go.
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. */
13 __go_int_to_string (int v)
17 unsigned char *retdata;
18 struct __go_string ret;
20 /* A negative value is not valid UTF-8; turn it into the replacement
32 buf[0] = 0xc0 + (v >> 6);
33 buf[1] = 0x80 + (v & 0x3f);
38 /* If the value is out of range for UTF-8, turn it into the
39 "replacement character". */
42 /* If the value is a surrogate pair, which is invalid in UTF-8,
43 turn it into the replacement character. */
44 if (v >= 0xd800 && v < 0xe000)
49 buf[0] = 0xe0 + (v >> 12);
50 buf[1] = 0x80 + ((v >> 6) & 0x3f);
51 buf[2] = 0x80 + (v & 0x3f);
56 buf[0] = 0xf0 + (v >> 18);
57 buf[1] = 0x80 + ((v >> 12) & 0x3f);
58 buf[2] = 0x80 + ((v >> 6) & 0x3f);
59 buf[3] = 0x80 + (v & 0x3f);
64 retdata = runtime_mallocgc (len, FlagNoPointers, 1, 0);
65 __builtin_memcpy (retdata, buf, len);