1 files changed, 85 insertions, 0 deletions
diff --git a/libgo/runtime/go-int-array-to-string.c b/libgo/runtime/go-int-array-to-string.c
new file mode 100644
index 0000000000..46a33dafc2
--- /dev/null
+++ b/libgo/runtime/go-int-array-to-string.c
@@ -0,0 +1,85 @@
+/* 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 "go-string.h"
+#include "runtime.h"
+#include "malloc.h"
+
+struct __go_string
+__go_int_array_to_string (const void* p, size_t len)
+{
+  const int *ints;
+  size_t slen;
+  size_t i;
+  unsigned char *retdata;
+  struct __go_string ret;
+  unsigned char *s;
+
+  ints = (const int *) p;
+
+  slen = 0;
+  for (i = 0; i < len; ++i)
+    {
+      int v;
+
+      v = ints[i];
+
+      if (v > 0x10ffff)
+	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 (slen, RefNoPointers, 1, 0);
+  ret.__data = retdata;
+  ret.__length = slen;
+
+  s = retdata;
+  for (i = 0; i < len; ++i)
+    {
+      int v;
+
+      v = ints[i];
+
+      /* If V is out of range for UTF-8, substitute the replacement
+	 character.  */
+      if (v > 0x10ffff)
+	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 ((size_t) (s - retdata) == slen);
+
+  return ret;
+}