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|
// -*- C++ -*-
/* Copyright (C) 2005, 2006
Free Software Foundation, Inc.
Written by Werner Lemberg (wl@gnu.org)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING. If not, write to the Free Software
Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
#include "lib.h"
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
#include "errarg.h"
#include "error.h"
#include "nonposix.h"
#include "stringclass.h"
#include <locale.h>
#if HAVE_LANGINFO_CODESET
# include <langinfo.h>
#endif
#if HAVE_ICONV
# include <iconv.h>
# ifdef WORDS_BIGENDIAN
# define UNICODE "UTF-32BE"
# else
# define UNICODE "UTF-32LE"
# endif
#endif
#define MAX_VAR_LEN 100
extern "C" const char *Version_string;
const char *default_encoding;
char user_encoding[MAX_VAR_LEN];
char encoding_string[MAX_VAR_LEN];
int debug_flag = 0;
int raw_flag = 0;
struct conversion {
const char *from;
const char *to;
};
// The official list of MIME tags can be found at
//
// http://www.iana.org/assignments/character-sets
//
// For encodings which don't have a MIME tag we use GNU iconv's encoding
// names (which also work with the portable GNU libiconv package). They
// are marked with `*'.
//
// Encodings specific to XEmacs and Emacs are marked as such; no mark means
// that they are used by both Emacs and XEmacs.
//
// Encodings marked with `--' are special to Emacs, XEmacs, or other
// applications and shouldn't be used for data exchange.
//
// `Not covered' means that the encoding can be handled neither by GNU iconv
// nor by libiconv, or just one of them has support for it.
//
// A special case is VIQR encoding: Despite of having a MIME tag it is
// missing in both libiconv 1.10 and iconv (coming with GNU libc 2.3.6).
//
// Finally, we add all aliases of GNU iconv for `ascii', `latin1', and
// `utf8' to catch those encoding names before iconv is called.
//
// Note that most entries are commented out -- only a small, (rather)
// reliable and stable subset of encodings is recognized (for coding tags)
// which are still in greater use today (January 2006). Most notably, all
// Windows-specific encodings are not selected because they lack stability:
// Microsoft has changed the mappings instead of creating new versions.
//
// Please contact the groff list if you find the selection inadequate.
static const conversion
emacs_to_mime[] = {
{"ascii", "US-ASCII"}, // Emacs
{"big5", "Big5"},
{"chinese-big5", "Big5"}, // Emacs
{"chinese-euc", "GB2312"}, // XEmacs
{"chinese-iso-8bit", "GB2312"}, // Emacs
{"cn-big5", "Big5"},
{"cn-gb", "GB2312"}, // Emacs
{"cn-gb-2312", "GB2312"},
{"cp878", "KOI8-R"}, // Emacs
{"cp1047", "CP1047"}, // EBCDIC
{"csascii", "US-ASCII"}, // alias
{"csisolatin1", "ISO-8859-1"}, // alias
{"cyrillic-iso-8bit", "ISO-8859-5"}, // Emacs
{"cyrillic-koi8", "KOI8-R"}, // not KOI8!, Emacs
{"euc-china", "GB2312"}, // Emacs
{"euc-cn", "GB2312"}, // Emacs
{"euc-japan", "EUC-JP"},
{"euc-japan-1990", "EUC-JP"}, // Emacs
{"euc-jp", "EUC-JP"},
{"euc-korea", "EUC-KR"},
{"euc-kr", "EUC-KR"},
{"gb2312", "GB2312"},
{"greek-iso-8bit", "ISO-8859-7"},
{"iso-10646/utf8", "UTF-8"}, // alias
{"iso-10646/utf-8", "UTF-8"}, // alias
{"iso-8859-1", "ISO-8859-1"},
{"iso-8859-13", "ISO-8859-13"}, // Emacs
{"iso-8859-15", "ISO-8859-15"},
{"iso-8859-2", "ISO-8859-2"},
{"iso-8859-5", "ISO-8859-5"},
{"iso-8859-7", "ISO-8859-7"},
{"iso-8859-9", "ISO-8859-9"},
{"iso-latin-1", "ISO-8859-1"},
{"iso-latin-2", "ISO-8859-2"}, // Emacs
{"iso-latin-5", "ISO-8859-9"}, // Emacs
{"iso-latin-7", "ISO-8859-13"}, // Emacs
{"iso-latin-9", "ISO-8859-15"}, // Emacs
{"japanese-iso-8bit", "EUC-JP"}, // Emacs
{"japanese-euc", "EUC-JP"}, // XEmacs
{"jis8", "EUC-JP"}, // XEmacs
{"koi8", "KOI8-R"}, // not KOI8!, Emacs
{"koi8-r", "KOI8-R"},
{"korean-euc", "EUC-KR"}, // XEmacs
{"korean-iso-8bit", "EUC-KR"}, // Emacs
{"latin1", "ISO-8859-1"}, // alias
{"latin-0", "ISO-8859-15"}, // Emacs
{"latin-1", "ISO-8859-1"}, // Emacs
{"latin-2", "ISO-8859-2"}, // Emacs
{"latin-5", "ISO-8859-9"}, // Emacs
{"latin-7", "ISO-8859-13"}, // Emacs
{"latin-9", "ISO-8859-15"}, // Emacs
{"mule-utf-16", "UTF-16"}, // Emacs
{"mule-utf-16be", "UTF-16BE"}, // Emacs
{"mule-utf-16-be", "UTF-16BE"}, // Emacs
{"mule-utf-16be-with-signature", "UTF-16"}, // Emacs, not UTF-16BE
{"mule-utf-16le", "UTF-16LE"}, // Emacs
{"mule-utf-16-le", "UTF-16LE"}, // Emacs
{"mule-utf-16le-with-signature", "UTF-16"}, // Emacs, not UTF-16LE
{"mule-utf-8", "UTF-8"}, // Emacs
{"us-ascii", "US-ASCII"}, // Emacs
{"utf8", "UTF-8"}, // alias
{"utf-16", "UTF-16"}, // Emacs
{"utf-16-be", "UTF-16BE"}, // Emacs
{"utf-16-be-with-signature", "UTF-16"}, // Emacs, not UTF-16BE
{"utf-16-le", "UTF-16LE"}, // Emacs
{"utf-16-le-with-signature", "UTF-16"}, // Emacs, not UTF-16LE
{"utf-8", "UTF-8"}, // Emacs
// {"alternativnyj", ""}, // ?
// {"arabic-iso-8bit", "ISO-8859-6"}, // Emacs
// {"binary", ""}, // --
// {"chinese-hz", "HZ-GB-2312"}, // Emacs
// {"chinese-iso-7bit", "ISO-2022-CN"}, // Emacs
// {"chinese-iso-8bit-with-esc", ""}, // --
// {"compound-text", ""}, // --
// {"compound-text-with-extension", ""}, // --
// {"cp1125", "cp1125"}, // *
// {"cp1250", "windows-1250"},// Emacs
// {"cp1251", "windows-1251"},// Emacs
// {"cp1252", "windows-1252"},// Emacs
// {"cp1253", "windows-1253"},// Emacs
// {"cp1254", "windows-1254"},// Emacs
// {"cp1255", "windows-1255"},// Emacs
// {"cp1256", "windows-1256"},// Emacs
// {"cp1257", "windows-1257"},// Emacs
// {"cp1258", "windows-1258"},// Emacs
// {"cp437", "cp437"}, // Emacs
// {"cp720", ""}, // not covered
// {"cp737", "cp737"}, // *, Emacs
// {"cp775", "cp775"}, // Emacs
// {"cp850", "cp850"}, // Emacs
// {"cp851", "cp851"}, // Emacs
// {"cp852", "cp852"}, // Emacs
// {"cp855", "cp855"}, // Emacs
// {"cp857", "cp857"}, // Emacs
// {"cp860", "cp860"}, // Emacs
// {"cp861", "cp861"}, // Emacs
// {"cp862", "cp862"}, // Emacs
// {"cp863", "cp863"}, // Emacs
// {"cp864", "cp864"}, // Emacs
// {"cp865", "cp865"}, // Emacs
// {"cp866", "cp866"}, // Emacs
// {"cp866u", "cp1125"}, // *, Emacs
// {"cp869", "cp869"}, // Emacs
// {"cp874", "cp874"}, // *, Emacs
// {"cp932", "cp932"}, // *, Emacs
// {"cp936", "cp936"}, // Emacs
// {"cp949", "cp949"}, // *, Emacs
// {"cp950", "cp950"}, // *, Emacs
// {"ctext", ""}, // --
// {"ctext-no-compositions", ""}, // --
// {"ctext-with-extensions", ""}, // --
// {"cyrillic-alternativnyj", ""}, // ?, Emacs
// {"cyrillic-iso-8bit-with-esc", ""}, // --
// {"cyrillic-koi8-t", "KOI8-T"}, // *, Emacs
// {"devanagari", ""}, // not covered
// {"dos", ""}, // --
// {"emacs-mule", ""}, // --
// {"euc-jisx0213", "EUC-JISX0213"},// *, XEmacs?
// {"euc-jisx0213-with-esc", ""}, // XEmacs?
// {"euc-taiwan", "EUC-TW"}, // *, Emacs
// {"euc-tw", "EUC-TW"}, // *, Emacs
// {"georgian-ps", "GEORGIAN-PS"}, // *, Emacs
// {"greek-iso-8bit-with-esc", ""}, // --
// {"hebrew-iso-8bit", "ISO-8859-8"}, // Emacs
// {"hebrew-iso-8bit-with-esc", ""}, // --
// {"hz", "HZ-GB-2312"},
// {"hz-gb-2312", "HZ-GB-2312"},
// {"in-is13194", ""}, // not covered
// {"in-is13194-devanagari", ""}, // not covered
// {"in-is13194-with-esc", ""}, // --
// {"iso-2022-7", ""}, // XEmacs?
// {"iso-2022-7bit", ""}, // --
// {"iso-2022-7bit-lock", ""}, // --
// {"iso-2022-7bit-lock-ss2", ""}, // --
// {"iso-2022-7bit-ss2", ""}, // --
// {"iso-2022-8", ""}, // XEmacs?
// {"iso-2022-8bit", ""}, // XEmacs?
// {"iso-2022-8bit-lock", ""}, // XEmacs?
// {"iso-2022-8bit-lock-ss2", ""}, // XEmacs?
// {"iso-2022-8bit-ss2", ""}, // --
// {"iso-2022-cjk", ""}, // --
// {"iso-2022-cn", "ISO-2022-CN"}, // Emacs
// {"iso-2022-cn-ext", "ISO-2022-CN-EXT"},// Emacs
// {"iso-2022-int-1", ""}, // --
// {"iso-2022-jp", "ISO-2022-JP"},
// {"iso-2022-jp-1978-irv", "ISO-2022-JP"},
// {"iso-2022-jp-2", "ISO-2022-JP-2"},
// {"iso-2022-jp-3", "ISO-2022-JP-3"},// *, XEmacs?
// {"iso-2022-jp-3-compatible", ""}, // XEmacs?
// {"iso-2022-jp-3-strict", "ISO-2022-JP-3"},// *, XEmacs?
// {"iso-2022-kr", "ISO-2022-KR"},
// {"iso-2022-lock", ""}, // XEmacs?
// {"iso-8859-10", "ISO-8859-10"}, // Emacs
// {"iso-8859-11", "ISO-8859-11"}, // *, Emacs
// {"iso-8859-14", "ISO-8859-14"}, // Emacs
// {"iso-8859-16", "ISO-8859-16"},
// {"iso-8859-3", "ISO-8859-3"},
// {"iso-8859-4", "ISO-8859-4"},
// {"iso-8859-6", "ISO-8859-6"},
// {"iso-8859-8", "ISO-8859-8"},
// {"iso-8859-8-e", "ISO-8859-8"},
// {"iso-8859-8-i", "ISO-8859-8"}, // Emacs
// {"iso-latin-10", "ISO-8859-16"}, // Emacs
// {"iso-latin-1-with-esc", ""}, // --
// {"iso-latin-2-with-esc", ""}, // --
// {"iso-latin-3", "ISO-8859-3"}, // Emacs
// {"iso-latin-3-with-esc", ""}, // --
// {"iso-latin-4", "ISO-8859-4"}, // Emacs
// {"iso-latin-4-with-esc", ""}, // --
// {"iso-latin-5-with-esc", ""}, // --
// {"iso-latin-6", "ISO-8859-10"}, // Emacs
// {"iso-latin-8", "ISO-8859-14"}, // Emacs
// {"iso-safe", ""}, // --
// {"japanese-iso-7bit-1978-irv", "ISO-2022-JP"}, // Emacs
// {"japanese-iso-8bit-with-esc", ""}, // --
// {"japanese-shift-jis", "Shift_JIS"}, // Emacs
// {"japanese-shift-jisx0213", ""}, // XEmacs?
// {"jis7", "ISO-2022-JP"}, // Xemacs
// {"junet", "ISO-2022-JP"},
// {"koi8-t", "KOI8-T"}, // *, Emacs
// {"koi8-u", "KOI8-U"}, // Emacs
// {"korean-iso-7bit-lock", "ISO-2022-KR"},
// {"korean-iso-8bit-with-esc", ""}, // --
// {"lao", ""}, // not covered
// {"lao-with-esc", ""}, // --
// {"latin-10", "ISO-8859-16"}, // Emacs
// {"latin-3", "ISO-8859-3"}, // Emacs
// {"latin-4", "ISO-8859-4"}, // Emacs
// {"latin-6", "ISO-8859-10"}, // Emacs
// {"latin-8", "ISO-8859-14"}, // Emacs
// {"mac", ""}, // --
// {"mac-roman", "MACINTOSH"}, // Emacs
// {"mik", ""}, // not covered
// {"next", "NEXTSTEP"}, // *, Emacs
// {"no-conversion", ""}, // --
// {"old-jis", "ISO-2022-JP"},
// {"pt154", "PT154"}, // Emacs
// {"raw-text", ""}, // --
// {"ruscii", "cp1125"}, // *, Emacs
// {"shift-jis", "Shift_JIS"}, // XEmacs
// {"shift_jis", "Shift_JIS"},
// {"shift_jisx0213", "Shift_JISX0213"},// *, XEmacs?
// {"sjis", "Shift_JIS"}, // Emacs
// {"tcvn", "TCVN"}, // *, Emacs
// {"tcvn-5712", "TCVN"}, // *, Emacs
// {"thai-tis620", "TIS-620"},
// {"thai-tis620-with-esc", ""}, // --
// {"th-tis620", "TIS-620"},
// {"tibetan", ""}, // not covered
// {"tibetan-iso-8bit", ""}, // not covered
// {"tibetan-iso-8bit-with-esc", ""}, // --
// {"tis-620", "TIS-620"},
// {"tis620", "TIS-620"},
// {"undecided", ""}, // --
// {"unix", ""}, // --
// {"utf-7", "UTF-7"}, // Emacs
// {"utf-7-safe", ""}, // XEmacs?
// {"utf-8-ws", "UTF-8"}, // XEmacs?
// {"vietnamese-tcvn", "TCVN"}, // *, Emacs
// {"vietnamese-viqr", "VIQR"}, // not covered
// {"vietnamese-viscii", "VISCII"},
// {"vietnamese-vscii", ""}, // not covered
// {"viqr", "VIQR"}, // not covered
// {"viscii", "VISCII"},
// {"vscii", ""}, // not covered
// {"windows-037", ""}, // not covered
// {"windows-10000", ""}, // not covered
// {"windows-10001", ""}, // not covered
// {"windows-10006", ""}, // not covered
// {"windows-10007", ""}, // not covered
// {"windows-10029", ""}, // not covered
// {"windows-10079", ""}, // not covered
// {"windows-10081", ""}, // not covered
// {"windows-1026", ""}, // not covered
// {"windows-1200", ""}, // not covered
// {"windows-1250", "windows-1250"},
// {"windows-1251", "windows-1251"},
// {"windows-1252", "windows-1252"},
// {"windows-1253", "windows-1253"},
// {"windows-1254", "windows-1254"},
// {"windows-1255", "windows-1255"},
// {"windows-1256", "windows-1256"},
// {"windows-1257", "windows-1257"},
// {"windows-1258", "windows-1258"},
// {"windows-1361", "cp1361"}, // *, XEmacs
// {"windows-437", "cp437"}, // XEmacs
// {"windows-500", ""}, // not covered
// {"windows-708", ""}, // not covered
// {"windows-709", ""}, // not covered
// {"windows-710", ""}, // not covered
// {"windows-720", ""}, // not covered
// {"windows-737", "cp737"}, // *, XEmacs
// {"windows-775", "cp775"}, // XEmacs
// {"windows-850", "cp850"}, // XEmacs
// {"windows-852", "cp852"}, // XEmacs
// {"windows-855", "cp855"}, // XEmacs
// {"windows-857", "cp857"}, // XEmacs
// {"windows-860", "cp860"}, // XEmacs
// {"windows-861", "cp861"}, // XEmacs
// {"windows-862", "cp862"}, // XEmacs
// {"windows-863", "cp863"}, // XEmacs
// {"windows-864", "cp864"}, // XEmacs
// {"windows-865", "cp865"}, // XEmacs
// {"windows-866", "cp866"}, // XEmacs
// {"windows-869", "cp869"}, // XEmacs
// {"windows-874", "cp874"}, // XEmacs
// {"windows-875", ""}, // not covered
// {"windows-932", "cp932"}, // *, XEmacs
// {"windows-936", "cp936"}, // XEmacs
// {"windows-949", "cp949"}, // *, XEmacs
// {"windows-950", "cp950"}, // *, XEmacs
// {"x-ctext", ""}, // --
// {"x-ctext-with-extensions", ""}, // --
{NULL, NULL},
};
// ---------------------------------------------------------
// Convert encoding name from emacs to mime.
// ---------------------------------------------------------
char *
emacs2mime(char *emacs_enc)
{
int emacs_enc_len = strlen(emacs_enc);
if (emacs_enc_len > 4
&& !strcasecmp(emacs_enc + emacs_enc_len - 4, "-dos"))
emacs_enc[emacs_enc_len - 4] = 0;
if (emacs_enc_len > 4
&& !strcasecmp(emacs_enc + emacs_enc_len - 4, "-mac"))
emacs_enc[emacs_enc_len - 4] = 0;
if (emacs_enc_len > 5
&& !strcasecmp(emacs_enc + emacs_enc_len - 5, "-unix"))
emacs_enc[emacs_enc_len - 5] = 0;
for (const conversion *table = emacs_to_mime; table->from; table++)
if (!strcasecmp(emacs_enc, table->from))
return (char *)table->to;
return emacs_enc;
}
// ---------------------------------------------------------
// Print out Unicode entity if value is greater than 0x7F.
// ---------------------------------------------------------
inline void
unicode_entity(int u)
{
if (u < 0x80)
putchar(u);
else
printf("\\[u%04X]", u);
}
// ---------------------------------------------------------
// Conversion functions. All functions take `data', which
// normally holds the first two lines, and a file pointer.
// ---------------------------------------------------------
// Conversion from ISO-8859-1 (aka Latin-1) to Unicode.
void
conversion_latin1(FILE *fp, const string &data)
{
int len = data.length();
const unsigned char *ptr = (const unsigned char *)data.contents();
for (int i = 0; i < len; i++)
unicode_entity(ptr[i]);
int c = -1;
while ((c = getc(fp)) != EOF)
unicode_entity(c);
}
// A future version of groff shall support UTF-8 natively.
// In this case, the UTF-8 stuff here in this file will be
// moved to the troff program.
struct utf8 {
FILE *fp;
unsigned char s[6];
enum {
FIRST = 0,
SECOND,
THIRD,
FOURTH,
FIFTH,
SIXTH
} byte;
int expected_bytes;
int invalid_warning;
int incomplete_warning;
utf8(FILE *);
~utf8();
void add(unsigned char);
void invalid();
void incomplete();
};
utf8::utf8(FILE *f) : fp(f), byte(FIRST), expected_bytes(1),
invalid_warning(1), incomplete_warning(1)
{
// empty
}
utf8::~utf8()
{
if (byte != FIRST)
incomplete();
}
inline void
utf8::add(unsigned char c)
{
s[byte] = c;
if (byte == FIRST) {
if (c < 0x80)
unicode_entity(c);
else if (c < 0xC0)
invalid();
else if (c < 0xE0) {
expected_bytes = 2;
byte = SECOND;
}
else if (c < 0xF0) {
expected_bytes = 3;
byte = SECOND;
}
else if (c < 0xF8) {
expected_bytes = 4;
byte = SECOND;
}
else if (c < 0xFC) {
expected_bytes = 5;
byte = SECOND;
}
else if (c < 0xFE) {
expected_bytes = 6;
byte = SECOND;
}
else
invalid();
return;
}
if (c < 0x80 || c > 0xBF) {
incomplete();
add(c);
return;
}
switch (byte) {
case FIRST:
// can't happen
break;
case SECOND:
if (expected_bytes == 2) {
if (s[0] < 0xC2)
invalid();
else
unicode_entity(((s[0] & 0x1F) << 6)
| (s[1] ^ 0x80));
byte = FIRST;
}
else
byte = THIRD;
break;
case THIRD:
if (expected_bytes == 3) {
if (!(s[0] >= 0xE1 || s[1] >= 0xA0))
invalid();
else
unicode_entity(((s[0] & 0x1F) << 12)
| ((s[1] ^ 0x80) << 6)
| (s[2] ^ 0x80));
byte = FIRST;
}
else
byte = FOURTH;
break;
case FOURTH:
// We reject everything greater than 0x10FFFF.
if (expected_bytes == 4) {
if (!((s[0] >= 0xF1 || s[1] >= 0x90)
&& (s[0] < 0xF4 || (s[0] == 0xF4 && s[1] < 0x90))))
invalid();
else
unicode_entity(((s[0] & 0x07) << 18)
| ((s[1] ^ 0x80) << 12)
| ((s[2] ^ 0x80) << 6)
| (s[3] ^ 0x80));
byte = FIRST;
}
else
byte = FIFTH;
break;
case FIFTH:
if (expected_bytes == 5) {
invalid();
byte = FIRST;
}
else
byte = SIXTH;
break;
case SIXTH:
invalid();
byte = FIRST;
break;
}
}
void
utf8::invalid()
{
if (debug_flag && invalid_warning) {
fprintf(stderr, " invalid byte(s) found in input stream --\n"
" each such sequence replaced with 0xFFFD\n");
invalid_warning = 0;
}
unicode_entity(0xFFFD);
byte = FIRST;
}
void
utf8::incomplete()
{
if (debug_flag && incomplete_warning) {
fprintf(stderr, " incomplete sequence(s) found in input stream --\n"
" each such sequence replaced with 0xFFFD\n");
incomplete_warning = 0;
}
unicode_entity(0xFFFD);
byte = FIRST;
}
// Conversion from UTF-8 to Unicode.
void
conversion_utf8(FILE *fp, const string &data)
{
utf8 u(fp);
int len = data.length();
const unsigned char *ptr = (const unsigned char *)data.contents();
for (int i = 0; i < len; i++)
u.add(ptr[i]);
int c = -1;
while ((c = getc(fp)) != EOF)
u.add(c);
return;
}
// Conversion from cp1047 (EBCDIC) to UTF-8.
void
conversion_cp1047(FILE *fp, const string &data)
{
static unsigned char cp1047[] = {
0x00, 0x01, 0x02, 0x03, 0x9C, 0x09, 0x86, 0x7F, // 0x00
0x97, 0x8D, 0x8E, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x9D, 0x85, 0x08, 0x87, // 0x10
0x18, 0x19, 0x92, 0x8F, 0x1C, 0x1D, 0x1E, 0x1F,
0x80, 0x81, 0x82, 0x83, 0x84, 0x0A, 0x17, 0x1B, // 0x20
0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x05, 0x06, 0x07,
0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04, // 0x30
0x98, 0x99, 0x9A, 0x9B, 0x14, 0x15, 0x9E, 0x1A,
0x20, 0xA0, 0xE2, 0xE4, 0xE0, 0xE1, 0xE3, 0xE5, // 0x40
0xE7, 0xF1, 0xA2, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
0x26, 0xE9, 0xEA, 0xEB, 0xE8, 0xED, 0xEE, 0xEF, // 0x50
0xEC, 0xDF, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
0x2D, 0x2F, 0xC2, 0xC4, 0xC0, 0xC1, 0xC3, 0xC5, // 0x60
0xC7, 0xD1, 0xA6, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
0xF8, 0xC9, 0xCA, 0xCB, 0xC8, 0xCD, 0xCE, 0xCF, // 0x70
0xCC, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
0xD8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, // 0x80
0x68, 0x69, 0xAB, 0xBB, 0xF0, 0xFD, 0xFE, 0xB1,
0xB0, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, // 0x90
0x71, 0x72, 0xAA, 0xBA, 0xE6, 0xB8, 0xC6, 0xA4,
0xB5, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, // 0xA0
0x79, 0x7A, 0xA1, 0xBF, 0xD0, 0x5B, 0xDE, 0xAE,
0xAC, 0xA3, 0xA5, 0xB7, 0xA9, 0xA7, 0xB6, 0xBC, // 0xB0
0xBD, 0xBE, 0xDD, 0xA8, 0xAF, 0x5D, 0xB4, 0xD7,
0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, // 0xC0
0x48, 0x49, 0xAD, 0xF4, 0xF6, 0xF2, 0xF3, 0xF5,
0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, // 0xD0
0x51, 0x52, 0xB9, 0xFB, 0xFC, 0xF9, 0xFA, 0xFF,
0x5C, 0xF7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, // 0xE0
0x59, 0x5A, 0xB2, 0xD4, 0xD6, 0xD2, 0xD3, 0xD5,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, // 0xF0
0x38, 0x39, 0xB3, 0xDB, 0xDC, 0xD9, 0xDA, 0x9F,
};
int len = data.length();
const unsigned char *ptr = (const unsigned char *)data.contents();
for (int i = 0; i < len; i++)
unicode_entity(cp1047[ptr[i]]);
int c = -1;
while ((c = getc(fp)) != EOF)
unicode_entity(cp1047[c]);
}
// Locale-sensible conversion.
#if HAVE_ICONV
void
conversion_iconv(FILE *fp, const string &data, char *enc)
{
iconv_t handle = iconv_open(UNICODE, enc);
if (handle == (iconv_t)-1) {
if (errno == EINVAL) {
error("encoding system `%1' not supported by iconv()", enc);
return;
}
fatal("iconv_open failed");
}
char inbuf[BUFSIZ];
int outbuf[BUFSIZ];
char *outptr = (char *)outbuf;
size_t outbytes_left = BUFSIZ * sizeof (int);
// Handle `data'.
char *inptr = (char *)data.contents();
size_t inbytes_left = data.length();
char *limit;
while (inbytes_left > 0) {
size_t status = iconv(handle, &inptr, &inbytes_left,
&outptr, &outbytes_left);
if (status == (size_t)-1) {
if (errno == EILSEQ) {
// Invalid byte sequence. XXX
inptr++;
inbytes_left--;
}
else if (errno == E2BIG) {
// Output buffer is full.
limit = (char *)outbuf + BUFSIZ * sizeof (int) - outbytes_left;
for (int *ptr = outbuf; (char *)ptr < limit; ptr++)
unicode_entity(*ptr);
memmove(outbuf, outptr, outbytes_left);
outptr = (char *)outbuf + outbytes_left;
outbytes_left = BUFSIZ * sizeof (int) - outbytes_left;
}
else if (errno == EINVAL) {
// `data' ends with partial input sequence.
memcpy(inbuf, inptr, inbytes_left);
break;
}
}
}
// Handle `fp' and switch to `inbuf'.
size_t read_bytes;
char *read_start = inbuf + inbytes_left;
while ((read_bytes = fread(read_start, 1, BUFSIZ - inbytes_left, fp)) > 0) {
inptr = inbuf;
inbytes_left += read_bytes;
while (inbytes_left > 0) {
size_t status = iconv(handle, &inptr, &inbytes_left,
&outptr, &outbytes_left);
if (status == (size_t)-1) {
if (errno == EILSEQ) {
// Invalid byte sequence. XXX
inptr++;
inbytes_left--;
}
else if (errno == E2BIG) {
// Output buffer is full.
limit = (char *)outbuf + BUFSIZ * sizeof (int) - outbytes_left;
for (int *ptr = outbuf; (char *)ptr < limit; ptr++)
unicode_entity(*ptr);
memmove(outbuf, outptr, outbytes_left);
outptr = (char *)outbuf + outbytes_left;
outbytes_left = BUFSIZ * sizeof (int) - outbytes_left;
}
else if (errno == EINVAL) {
// `inbuf' ends with partial input sequence.
memmove(inbuf, inptr, inbytes_left);
break;
}
}
}
read_start = inbuf + inbytes_left;
}
iconv_close(handle);
// XXX use ferror?
limit = (char *)outbuf + BUFSIZ * sizeof (int) - outbytes_left;
for (int *ptr = outbuf; (char *)ptr < limit; ptr++)
unicode_entity(*ptr);
}
#endif /* HAVE_ICONV */
// ---------------------------------------------------------
// Handle Byte Order Mark.
//
// Since we have a chicken-and-egg problem it's necessary
// to handle the BOM manually if it is in the data stream.
// As documented in the Unicode book it is very unlikely
// that any normal text file (regardless of the encoding)
// starts with the bytes which represent a BOM.
//
// Return the BOM in string `BOM'; `data' then starts with
// the byte after the BOM. This function reads (at most)
// four bytes from the data stream.
//
// Return encoding if a BOM is found, NULL otherwise.
// ---------------------------------------------------------
const char *
get_BOM(FILE *fp, string &BOM, string &data)
{
// The BOM is U+FEFF. We have thus the following possible
// representations.
//
// UTF-8: 0xEFBBBF
// UTF-16: 0xFEFF or 0xFFFE
// UTF-32: 0x0000FEFF or 0xFFFE0000
static struct {
int len;
const char *str;
const char *name;
} BOM_table[] = {
{4, "\x00\x00\xFE\xFF", "UTF-32"},
{4, "\xFF\xFE\x00\x00", "UTF-32"},
{3, "\xEF\xBB\xBF", "UTF-8"},
{2, "\xFE\xFF", "UTF-16"},
{2, "\xFF\xFE", "UTF-16"},
};
const int BOM_table_len = sizeof (BOM_table) / sizeof (BOM_table[0]);
char BOM_string[4];
const char *retval = NULL;
int len;
for (len = 0; len < 4; len++) {
int c = getc(fp);
if (c == EOF)
break;
BOM_string[len] = char(c);
}
int i;
for (i = 0; i < BOM_table_len; i++) {
if (BOM_table[i].len <= len
&& memcmp(BOM_string, BOM_table[i].str, BOM_table[i].len) == 0)
break;
}
int j = 0;
if (i < BOM_table_len) {
for (; j < BOM_table[i].len; j++)
BOM += BOM_string[j];
retval = BOM_table[i].name;
}
for (; j < len; j++)
data += BOM_string[j];
return retval;
}
// ---------------------------------------------------------
// Get first two lines from input stream.
//
// Return string (allocated with `new') without zero bytes
// or NULL in case no coding tag can occur in the data
// (which is stored unmodified in `data').
// ---------------------------------------------------------
char *
get_tag_lines(FILE *fp, string &data)
{
int newline_count = 0;
int c, prev = -1;
// Handle CR, LF, and CRLF as line separators.
for (int i = 0; i < data.length(); i++) {
c = data[i];
if (c == '\n' || c == '\r')
newline_count++;
if (c == '\n' && prev == '\r')
newline_count--;
prev = c;
}
if (newline_count > 1)
return NULL;
int emit_warning = 1;
for (int lines = newline_count; lines < 2; lines++) {
while ((c = getc(fp)) != EOF) {
if (c == '\0' && debug_flag && emit_warning) {
fprintf(stderr,
" null byte(s) found in input stream --\n"
" search for coding tag might return false result\n");
emit_warning = 0;
}
data += char(c);
if (c == '\n' || c == '\r')
break;
}
// Handle CR, LF, and CRLF as line separators.
if (c == '\r') {
c = getc(fp);
if (c != EOF && c != '\n')
ungetc(c, fp);
else
data += char(c);
}
}
return data.extract();
}
// ---------------------------------------------------------
// Check whether C string starts with a comment.
//
// Return 1 if true, 0 otherwise.
// ---------------------------------------------------------
int
is_comment_line(char *s)
{
if (!s || !*s)
return 0;
if (*s == '.')
{
s++;
while (*s == ' ' || *s == '\t')
s++;
if (*s && *s == '\\')
{
s++;
if (*s == '"' || *s == '#')
return 1;
}
}
else if (*s == '\\')
{
s++;
if (*s == '#')
return 1;
}
return 0;
}
// ---------------------------------------------------------
// Get a value/variable pair from a local variables list
// in a C string which look like this:
//
// <variable1>: <value1>; <variable2>: <value2>; ...
//
// Leading and trailing blanks are ignored. There might be
// more than one blank after `:' and `;'.
//
// Return position of next value/variable pair or NULL if
// at end of data.
// ---------------------------------------------------------
char *
get_variable_value_pair(char *d1, char **variable, char **value)
{
static char var[MAX_VAR_LEN], val[MAX_VAR_LEN];
*variable = var;
*value = val;
while (*d1 == ' ' || *d1 == '\t')
d1++;
// Get variable.
int l = 0;
while (l < MAX_VAR_LEN - 1 && *d1 && !strchr(";: \t", *d1))
var[l++] = *(d1++);
var[l] = 0;
// Skip everything until `:', `;', or end of data.
while (*d1 && *d1 != ':' && *d1 != ';')
d1++;
val[0] = 0;
if (!*d1)
return NULL;
if (*d1 == ';')
return d1 + 1;
d1++;
while (*d1 == ' ' || *d1 == '\t')
d1++;
// Get value.
l = 0;
while (l < MAX_VAR_LEN - 1 && *d1 && !strchr("; \t", *d1))
val[l++] = *(d1++);
val[l] = 0;
// Skip everything until `;' or end of data.
while (*d1 && *d1 != ';')
d1++;
if (*d1 == ';')
return d1 + 1;
return NULL;
}
// ---------------------------------------------------------
// Check coding tag in the read buffer.
//
// We search for the following line:
//
// .\"...-*-<local variables list>-*-
//
// (`...' might be anything). There can be blanks after
// the leading `.'; additionally, you might use `\#' starting
// a line instead of `.\"'.
//
// The local variables list must occur within the first
// comment block at the very beginning of the data stream.
//
// Within the <local variables list>, we search for
//
// coding: <value>
//
// which specifies the coding system used for the data
// stream.
//
// Return <value> if found, NULL otherwise.
//
// Note that null bytes in the data are skipped before applying
// the algorithm. This should work even with files encoded as
// UTF-16 or UTF-32 (or its siblings) in most cases.
//
// XXX Add support for tag at the end of buffer.
// ---------------------------------------------------------
char *
check_coding_tag(FILE *fp, string &data)
{
char *inbuf = get_tag_lines(fp, data);
char *lineend;
for (char *p = inbuf; is_comment_line(p); p = lineend + 1) {
if ((lineend = strchr(p, '\n')) == NULL)
break;
*lineend = 0; // switch temporarily to '\0'
char *d1 = strstr(p, "-*-");
char *d2 = 0;
if (d1)
d2 = strstr(d1 + 3, "-*-");
*lineend = '\n'; // restore newline
if (!d1 || !d2)
continue;
*d2 = 0; // switch temporarily to '\0'
d1 += 3;
while (d1) {
char *variable, *value;
d1 = get_variable_value_pair(d1, &variable, &value);
if (!strcasecmp(variable, "coding")) {
*d2 = '-'; // restore '-'
a_delete inbuf;
return value;
}
}
*d2 = '-'; // restore '-'
}
a_delete inbuf;
return NULL;
}
// ---------------------------------------------------------
// Handle an input file. If filename is `-' handle stdin.
//
// Return 1 on success, 0 otherwise.
// ---------------------------------------------------------
int
do_file(const char *filename)
{
FILE *fp;
string BOM, data;
if (strcmp(filename, "-")) {
if (debug_flag)
fprintf(stderr, "file `%s':\n", filename);
fp = fopen(filename, FOPEN_RB);
if (!fp) {
error("can't open `%1': %2", filename, strerror(errno));
return 0;
}
}
else {
if (debug_flag)
fprintf(stderr, "standard input:\n");
SET_BINARY(fileno(stdin));
fp = stdin;
}
const char *BOM_encoding = get_BOM(fp, BOM, data);
// Determine the encoding.
char *encoding;
if (user_encoding[0]) {
if (debug_flag) {
fprintf(stderr, " user-specified encoding `%s', "
"no search for coding tag\n",
user_encoding);
if (BOM_encoding && strcmp(BOM_encoding, user_encoding))
fprintf(stderr, " but BOM in data stream implies encoding `%s'!\n",
BOM_encoding);
}
encoding = (char *)user_encoding;
}
else if (BOM_encoding) {
if (debug_flag)
fprintf(stderr, " found BOM, no search for coding tag\n");
encoding = (char *)BOM_encoding;
}
else {
// `check_coding_tag' returns a pointer to a static array (or NULL).
char *file_encoding = check_coding_tag(fp, data);
if (!file_encoding) {
if (debug_flag)
fprintf(stderr, " no file encoding\n");
file_encoding = (char *)default_encoding;
}
else
if (debug_flag)
fprintf(stderr, " file encoding: `%s'\n", file_encoding);
encoding = file_encoding;
}
strncpy(encoding_string, encoding, MAX_VAR_LEN - 1);
encoding_string[MAX_VAR_LEN - 1] = 0;
encoding = encoding_string;
// Translate from MIME & Emacs encoding names to locale encoding names.
encoding = emacs2mime(encoding_string);
if (encoding[0] == '\0') {
error("encoding `%1' not supported, not a portable encoding",
encoding_string);
return 0;
}
if (debug_flag)
fprintf(stderr, " encoding used: `%s'\n", encoding);
data = BOM + data;
if (!raw_flag)
printf(".lf 1 %s\n", filename);
int success = 1;
// Call converter (converters write to stdout).
if (!strcasecmp(encoding, "ISO-8859-1"))
conversion_latin1(fp, data);
else if (!strcasecmp(encoding, "UTF-8"))
conversion_utf8(fp, data);
else if (!strcasecmp(encoding, "cp1047"))
conversion_cp1047(fp, data);
else {
#if HAVE_ICONV
conversion_iconv(fp, data, encoding);
#else
error("encoding system `%1' not supported", encoding);
success = 0;
#endif /* I18N */
}
if (fp != stdin)
fclose(fp);
return success;
}
// ---------------------------------------------------------
// Print usage.
// ---------------------------------------------------------
void
usage(FILE *stream)
{
fprintf(stream, "usage: %s [ option ] [ files ]\n"
"\n"
"-d show debugging messages\n"
"-e encoding specify input encoding\n"
"-h print this message\n"
"-r don't add .lf requests\n"
"-v print version number\n"
"\n"
"The default encoding is `%s'.\n",
program_name, default_encoding);
}
// ---------------------------------------------------------
// Main routine.
// ---------------------------------------------------------
int
main(int argc, char **argv)
{
// Determine the default encoding. This must be done before
// getopt() is called since the usage message shows the default
// encoding.
setlocale(LC_ALL, "");
#if HAVE_LANGINFO_CODESET
char *locale = setlocale(LC_CTYPE, NULL);
if (!locale || !strcmp(locale, "C") || !strcmp(locale, "POSIX"))
default_encoding = "latin1";
else {
default_encoding = nl_langinfo(CODESET);
if (!default_encoding)
default_encoding = "latin1";
}
#else
default_encoding = "latin1";
#endif /* HAVE_LANGINFO_CODESET */
program_name = argv[0];
int opt;
static const struct option long_options[] = {
{ "help", no_argument, 0, CHAR_MAX + 1 },
{ "version", no_argument, 0, 'v' },
{ NULL, 0, 0, 0 }
};
// Parse the command line options.
while ((opt = getopt_long(argc, argv,
"de:hrv", long_options, NULL)) != EOF)
switch (opt) {
case 'v':
printf("GNU preconv (groff) version %s %s iconv support\n",
Version_string,
#ifdef I18N
"with"
#else
"without"
#endif /* I18N */
);
exit(0);
break;
case 'd':
debug_flag = 1;
break;
case 'e':
if (optarg) {
strncpy(user_encoding, optarg, MAX_VAR_LEN - 1);
user_encoding[MAX_VAR_LEN - 1] = 0;
}
else
user_encoding[0] = 0;
break;
case 'r':
raw_flag = 1;
break;
case CHAR_MAX + 1: // --help
usage(stdout);
exit(0);
break;
case '?':
usage(stderr);
exit(1);
break;
default:
assert(0);
}
int nbad = 0;
if (debug_flag)
fprintf(stderr, "default encoding: `%s'\n", default_encoding);
if (optind >= argc)
nbad += !do_file("-");
else
for (int i = optind; i < argc; i++)
nbad += !do_file(argv[i]);
if (ferror(stdout) || fflush(stdout) < 0)
fatal("output error");
return nbad != 0;
}
/* end of preconv.cpp */
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