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/*-------------------------------------------------------------------------
*
* compat.c
* Compatibility routines to let the JSON module work in PostgreSQL 8.4
*
* Copyright (c) 2011, PostgreSQL Global Development Group
* Arranged by Joey Adams <joeyadams3.14159@gmail.com>.
*
*-------------------------------------------------------------------------
*/
#include "compat.h"
#if PG_VERSION_NUM < 90100
/*
* Lifted from 9.1devel
*
* Convert a UTF-8 character to a Unicode code point.
* This is a one-character version of pg_utf2wchar_with_len.
*
* No error checks here, c must point to a long-enough string.
*/
pg_wchar
json_compat_utf8_to_unicode(const unsigned char *c)
{
if ((*c & 0x80) == 0)
return (pg_wchar) c[0];
else if ((*c & 0xe0) == 0xc0)
return (pg_wchar) (((c[0] & 0x1f) << 6) |
(c[1] & 0x3f));
else if ((*c & 0xf0) == 0xe0)
return (pg_wchar) (((c[0] & 0x0f) << 12) |
((c[1] & 0x3f) << 6) |
(c[2] & 0x3f));
else if ((*c & 0xf8) == 0xf0)
return (pg_wchar) (((c[0] & 0x07) << 18) |
((c[1] & 0x3f) << 12) |
((c[2] & 0x3f) << 6) |
(c[3] & 0x3f));
else
/* that is an invalid code on purpose */
return 0xffffffff;
}
#endif
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