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/* go-int-array-to-string.c -- convert an array of ints to a string in Go.
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 "go-assert.h"
#include "runtime.h"
#include "arch.h"
#include "malloc.h"
String
__go_int_array_to_string (const void* p, intgo len)
{
const int32 *ints;
intgo slen;
intgo i;
unsigned char *retdata;
String ret;
unsigned char *s;
ints = (const int32 *) p;
slen = 0;
for (i = 0; i < len; ++i)
{
int32 v;
v = ints[i];
if (v < 0 || v > 0x10ffff)
v = 0xfffd;
else if (0xd800 <= v && v <= 0xdfff)
v = 0xfffd;
if (v <= 0x7f)
slen += 1;
else if (v <= 0x7ff)
slen += 2;
else if (v <= 0xffff)
slen += 3;
else
slen += 4;
}
retdata = runtime_mallocgc ((uintptr) slen, 0, FlagNoScan);
ret.str = retdata;
ret.len = slen;
s = retdata;
for (i = 0; i < len; ++i)
{
int32 v;
v = ints[i];
/* If V is out of range for UTF-8, substitute the replacement
character. */
if (v < 0 || v > 0x10ffff)
v = 0xfffd;
else if (0xd800 <= v && v <= 0xdfff)
v = 0xfffd;
if (v <= 0x7f)
*s++ = v;
else if (v <= 0x7ff)
{
*s++ = 0xc0 | ((v >> 6) & 0x1f);
*s++ = 0x80 | (v & 0x3f);
}
else if (v <= 0xffff)
{
*s++ = 0xe0 | ((v >> 12) & 0xf);
*s++ = 0x80 | ((v >> 6) & 0x3f);
*s++ = 0x80 | (v & 0x3f);
}
else
{
*s++ = 0xf0 | ((v >> 18) & 0x7);
*s++ = 0x80 | ((v >> 12) & 0x3f);
*s++ = 0x80 | ((v >> 6) & 0x3f);
*s++ = 0x80 | (v & 0x3f);
}
}
__go_assert (s - retdata == slen);
return ret;
}
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