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. */
12 __go_int_to_string (intgo v)
16 unsigned char *retdata;
19 /* A negative value is not valid UTF-8; turn it into the replacement
31 buf[0] = 0xc0 + (v >> 6);
32 buf[1] = 0x80 + (v & 0x3f);
37 /* If the value is out of range for UTF-8, turn it into the
38 "replacement character". */
41 /* If the value is a surrogate pair, which is invalid in UTF-8,
42 turn it into the replacement character. */
43 if (v >= 0xd800 && v < 0xe000)
48 buf[0] = 0xe0 + (v >> 12);
49 buf[1] = 0x80 + ((v >> 6) & 0x3f);
50 buf[2] = 0x80 + (v & 0x3f);
55 buf[0] = 0xf0 + (v >> 18);
56 buf[1] = 0x80 + ((v >> 12) & 0x3f);
57 buf[2] = 0x80 + ((v >> 6) & 0x3f);
58 buf[3] = 0x80 + (v & 0x3f);
63 retdata = runtime_mallocgc (len, FlagNoPointers, 1, 0);
64 __builtin_memcpy (retdata, buf, len);