70 lines
1.4 KiB
C
70 lines
1.4 KiB
C
/* go-int-to-string.c -- convert an integer to a string in Go.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "runtime.h"
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#include "arch.h"
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#include "malloc.h"
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String
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__go_int_to_string (intgo v)
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{
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char buf[4];
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int len;
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unsigned char *retdata;
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String ret;
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/* A negative value is not valid UTF-8; turn it into the replacement
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character. */
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if (v < 0)
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v = 0xfffd;
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if (v <= 0x7f)
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{
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buf[0] = v;
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len = 1;
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}
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else if (v <= 0x7ff)
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{
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buf[0] = 0xc0 + (v >> 6);
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buf[1] = 0x80 + (v & 0x3f);
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len = 2;
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}
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else
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{
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/* If the value is out of range for UTF-8, turn it into the
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"replacement character". */
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if (v > 0x10ffff)
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v = 0xfffd;
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/* If the value is a surrogate pair, which is invalid in UTF-8,
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turn it into the replacement character. */
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if (v >= 0xd800 && v < 0xe000)
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v = 0xfffd;
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if (v <= 0xffff)
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{
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buf[0] = 0xe0 + (v >> 12);
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buf[1] = 0x80 + ((v >> 6) & 0x3f);
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buf[2] = 0x80 + (v & 0x3f);
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len = 3;
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}
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else
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{
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buf[0] = 0xf0 + (v >> 18);
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buf[1] = 0x80 + ((v >> 12) & 0x3f);
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buf[2] = 0x80 + ((v >> 6) & 0x3f);
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buf[3] = 0x80 + (v & 0x3f);
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len = 4;
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}
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}
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retdata = runtime_mallocgc (len, 0, FlagNoScan);
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__builtin_memcpy (retdata, buf, len);
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ret.str = retdata;
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ret.len = len;
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return ret;
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}
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