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yap-6.3/os/encoding.h

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/*************************************************************************
* *
* YAP Prolog %W% %G%
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-2003 *
* *
**************************************************************************
* *
* File: yapio.h *
* Last rev: 22/1/03 *
* mods: *
* comments: UNICODE encoding support (based on SWI-Prolog) *
* *
*************************************************************************/
#ifndef ENCODING_H
#define ENCODING_H 1
typedef enum {
ENC_OCTET = 0, /// binary files
ENC_ISO_LATIN1 = 1, /// US+West Europe
ENC_ISO_ASCII = 2, /// US only
ENC_ISO_ANSI = 4, /// Who cares
ENC_ISO_UTF8 = 8, /// Most everyone nowadays
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ENC_UTF16_BE = 16, /// People who made a mistake
ENC_UTF16_LE = 32, /// People who made the same mistake
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ENC_ISO_UTF32_BE = 64, /// nobody
ENC_ISO_UTF32_LE = 128, /// yes, nobody
} encoding_t;
#if defined(__BIG_ENDIAN__)
#define ENC_WCHAR ENC_ISO_UTF32_BE
#else
#define ENC_WCHAR ENC_ISO_UTF32_LE
#endif
#ifdef YAP_H
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/// read the current environment, as set by the user or as Initial
encoding_t Yap_DefaultEncoding( void );
void Yap_SetDefaultEncoding(encoding_t new_encoding);
#if HAVE_XLOCALE_H
typedef enum {
SEQ_ENC_OCTET, /// binary files
SEQ_ENC_ISO_LATIN1, /// US+West Europe
SEQ_ENC_ISO_ASCII , /// US only
SEQ_ENC_ISO_ANSI , /// Who cares
SEQ_ENC_ISO_UTF8 , /// Most everyone nowadays
SEQ_ENC_UTF16_BE, /// People who made a mistake
SEQ_ENC_UTF16_LE, /// People who made the same mistake
v\ SEQ_ENC_ISO_UTF32_BE, /// nobody
SEQ_ENC_ISO_UTF32_LE /// yes, nobody
} seq_encoding_t;
/// convert from unary to binary representation.
static inline seq_encoding_t seq_encoding(encoding_t inp) {
#if HAVE__BUILTIN_FFSLL
return __builtin_ffsll(inp);
#elif HAVE_FFSLL
return ffsll(inp);
#else
unsigned int out;
// supports max 16 different encodings.
if (inp==0)
return 0L;
// if (inp & ((CELL)0xffffL << 16)) {inp >>= 16; out += 16;}
if (inp & ((CELL)0xffL << 8)) {inp >>= 8; out += 8;}
if (inp & ((CELL)0xfL << 4)) {inp >>= 4; out += 4;}
if (inp & ((CELL)0x3L << 2)) {inp >>= 2; out += 2;}
if (inp & ((CELL)0x1 << 1)) out++;
#endif
return out;
}
extern xlocale enc_locales[SEQ_ENC_ISO_UTF32_LE+1];
#endif
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static inline const char *enc_name(encoding_t enc)
{
switch(enc)
{
case ENC_OCTET: return "octet";
case ENC_ISO_LATIN1: return "iso_latin_1";
case ENC_ISO_ASCII: return "ascii";
case ENC_ISO_ANSI: return "octet";
case ENC_ISO_UTF8: return "utf8";
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case ENC_UTF16_BE: return "utf16_be";
case ENC_UTF16_LE: return "utf16_le";
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case ENC_ISO_UTF32_BE: return "utf32_be";
case ENC_ISO_UTF32_LE: return "utf32_le";
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default: return "thanks for watching!!";
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}
}
static inline
encoding_t enc_id(char *s)
{
{
if (!strcmp(s, "iso_utf8")) return ENC_ISO_UTF8;
if (!strcmp(s, "utf16_be")) return ENC_UTF16_BE;
if (!strcmp(s, "utf16_le")) return ENC_UTF16_LE;
if (!strcmp(s, "octet")) return ENC_OCTET;
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if (!strcmp(s, "iso_latin_1")) return ENC_ISO_LATIN1;
if (!strcmp(s, "iso_ascii")) return ENC_ISO_ASCII;
if (!strcmp(s, "iso_ansi")) return ENC_ISO_ANSI;
if (!strcmp(s, "utf32_be")) return ENC_ISO_UTF32_BE;
if (!strcmp(s, "utf32_le")) return ENC_ISO_UTF32_LE;
if (!strcmp(s, "default")) return Yap_DefaultEncoding();
else {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, 0, "bad encoding %s", s);
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return ENC_OCTET;
}
}
}
#endif
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#endif