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