/***************************************************************************** * * $Id: charset.c,v 1.43 2007/09/12 18:12:58 mbse Exp $ * Purpose ...............: Characterset functions * ***************************************************************************** * Copyright (C) 1997-2007 * * Michiel Broek FIDO: 2:280/2802 * Beekmansbos 10 * 1971 BV IJmuiden * the Netherlands * * This file is part of MBSE BBS. * * This BBS 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. * * MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *****************************************************************************/ #include "../config.h" #include "mbselib.h" int use_tran1 = FALSE; /* Translate stage 1 active */ int use_tran2 = FALSE; /* Translate stage 2 active */ int loglevel = '-'; /* Debug loglevel */ #ifdef HAVE_ICONV_H iconv_t cd1; /* Conversion descriptor 1 */ iconv_t cd2; /* Conversion descriptor 2 */ #endif /* * Search table for CHRS: kludge to the current name. * This table may include obsolete names (and we need * them). */ struct _charalias charalias[] = { {(char *)"ASCII", (char *)"CP437"}, {(char *)"VT100", (char *)"CP437"}, {(char *)"US_ASCII", (char *)"CP437"}, {(char *)"LATIN", (char *)"LATIN-1"}, {(char *)"AMIGA", (char *)"CP437"}, {(char *)"IBMPC", (char *)"CP437"}, {(char *)"PC-8", (char *)"CP437"}, {(char *)"CP850", (char *)"CP437"}, {(char *)"MACINTOSH", (char *)"MAC"}, {(char *)"ALT", (char *)"CP866"}, {(char *)"X-ALT", (char *)"CP866"}, {(char *)"X-CP866", (char *)"CP866"}, {(char *)"+7_FIDO", (char *)"CP866"}, {(char *)"KOI8-U", (char *)"KOI8-R"}, {(char *)"IBM-878", (char *)"KOI8-R"}, {(char *)"CP878", (char *)"KOI8-R"}, {(char *)"IBM-915", (char *)"ISO-8859-1"}, {(char *)"X-CP1251", (char *)"CP1251"}, {(char *)"GBK", (char *)"CP936"}, {(char *)"HZ-GB-2312", (char *)"CP936"}, {NULL, NULL} }; /* * Array of charset identifiers. * ftncidx, ftnkludge, rfcname, ic_ftn, lang, desc */ struct _charmap charmap[] = { {FTNC_NONE, (char *)"Undef", (char *)"Undef", (char *)"Undef", (char *)"C", (char *)"Undefined"}, {FTNC_CP437, (char *)"CP437 2", (char *)"ibm437", (char *)"CP437", (char *)"en_US", (char *)"IBM codepage 437 (Western European) (ANSI terminal)"}, {FTNC_CP850, (char *)"CP850 2", (char *)"ibm850", (char *)"CP850", (char *)"en_US", (char *)"IBM codepage 850 (Latin-1) (ANSI terminal)"}, {FTNC_CP865, (char *)"CP865 2", (char *)"ibm865", (char *)"CP865", (char *)"sv_SE", (char *)"IBM codepage 865 (Nordic)"}, {FTNC_CP866, (char *)"CP866 2", (char *)"ibm866", (char *)"CP866", (char *)"ru_RU", (char *)"IBM codepage 866 (Russian)"}, {FTNC_LATIN_1,(char *)"LATIN-1 2",(char *)"iso-8859-1", (char *)"LATIN1", (char *)"en_US", (char *)"ISO 8859-1 (Western European)"}, {FTNC_LATIN_2,(char *)"LATIN-2 2",(char *)"iso-8859-2", (char *)"LATIN2", (char *)"cs_CZ", (char *)"ISO 8859-2 (Eastern European)"}, {FTNC_LATIN_5,(char *)"LATIN-5 2",(char *)"iso-8859-5", (char *)"LATIN5", (char *)"turks", (char *)"ISO 8859-5 (Turkish)"}, {FTNC_MAC, (char *)"MAC", (char *)"Macintosh", (char *)"MACINTOSH",(char *)"en_US", (char *)"MacIntosh character set"}, {FTNC_CP852, (char *)"CP852 2", (char *)"ibm852", (char *)"CP852", (char *)"cs_CZ", (char *)"IBM codepage 852 (Czech, Latin-2)"}, {FTNC_CP895, (char *)"CP895 2", (char *)"cp895", (char *)"CP850", (char *)"cs_CZ", (char *)"IBM codepage 895 (Czech, Kamenicky)"}, {FTNC_KOI8_R, (char *)"KOI8-R 2", (char *)"koi8-r", (char *)"KOI8-R", (char *)"ru_RUi.koi8r",(char *)"Unix codepage KOI8-R (Russian)"}, {FTNC_CP936, (char *)"CP936 2", (char *)"gbk", (char *)"CP936", (char *)"zh_CN.gbk", (char *)"IBM codepage 936 (Chinese, GBK)"}, {FTNC_LATIN_9,(char *)"LATIN-9 2",(char *)"iso-8859-15",(char *)"LATIN-9", (char *)"en_US", (char *)"ISO 8859-15 (Western European EURO)"}, {FTNC_UTF8, (char *)"UTF-8 4", (char *)"utf-8", (char *)"UTF-8", (char *)"en_US.UTF-8", (char *)"Unicode UTF-8 (ISO/IEC 10646)"}, {FTNC_ERROR, NULL, NULL, NULL, NULL, (char *)"ERROR"} }; /* * Returns index of charset or -1 if not found. */ int find_ftn_charset(char *ftnkludge) { static int i; int j; char *ftn, *cmp; ftn = calloc(81, sizeof(char)); cmp = calloc(81, sizeof(char)); snprintf(ftn, 80, "%s", ftnkludge); for (i = 0; i < strlen(ftn); i++) { if (ftn[i] == ' ') { ftn[i] = '\0'; break; } } for (i = 0; charalias[i].alias; i++) { if (strcasecmp(ftn, charalias[i].alias) == 0) break; } if (charalias[i].alias != NULL) { snprintf(ftn, 80, "%s", charalias[i].ftnkludge); } /* * Now search real entry. Throw away the charset level number, * we don't care about that useless byte. */ for (i = 0; charmap[i].ftnkludge; i++) { snprintf(cmp, 80, "%s", charmap[i].ftnkludge); for (j = 0; j < strlen(cmp); j++) { if (cmp[j] == ' ') { cmp[j] = '\0'; break; } } if (strcasecmp(ftn, cmp) == 0) break; } free(ftn); free(cmp); if (charmap[i].ftnkludge == NULL) { Syslog('m', "find_ftn_charset(%s) not found", ftnkludge); return FTNC_ERROR; } Syslog('m', "find_ftn_charset(%s) result %s", ftnkludge, charmap[i].ftnkludge); return i; } /* * Returns index of charset or -1 if not found. */ int find_rfc_charset(char *rfcname) { static int i; for (i = 0; charmap[i].rfcname; i++) { if (strcasecmp(rfcname, charmap[i].rfcname) == 0) break; } if (charmap[i].rfcname == NULL) { Syslog('m', "find_rfc_charset(%s) not found", rfcname); return FTNC_ERROR; } Syslog('m', "find_rfc_charset(%s) result %s", rfcname, charmap[i].rfcname); return i; } char *getftnchrs(int val) { static char kludge[21]; if ((val >= FTNC_NONE) && (val <= FTNC_MAXCHARS)) { Syslog('m', "getftnchrs(%d) %s", val, charmap[val].ftnkludge); snprintf(kludge, 20, "%s", charmap[val].ftnkludge); return kludge; } return (char *)"LATIN-1 2"; } char *getrfcchrs(int val) { static char rfcname[21]; if ((val >= FTNC_NONE) && (val <= FTNC_MAXCHARS)) { Syslog('m', "getrfcchrs(%d) %s", val, charmap[val].rfcname); snprintf(rfcname, 20, "%s", charmap[val].rfcname); return rfcname; } return (char *)"iso-8859-1"; } char *get_ic_ftn(int val) { static char ic_ftnname[21]; if ((val >= FTNC_NONE) && (val <= FTNC_MAXCHARS)) { Syslog('m', "get_ic_ftn(%d) %s", val, charmap[val].ic_ftn); snprintf(ic_ftnname, 20, "%s", charmap[val].ic_ftn); return ic_ftnname; } return (char *)"LATIN1"; } char *get_ic_rfc(int val) { static char ic_rfcname[21]; snprintf(ic_rfcname, 20, getrfcchrs(val)); tu(ic_rfcname); return ic_rfcname; } /* * Experimental table that should translate from the user selected * charset to a locale. This is not the right way to do, the best * thing is to store each bbs users locale instead and then lookup * his characterset using standard library calls. * * This is one of the things the bbs world never saw coming, in the * "good" old days bbses were almost allways called local. Thanks * to the internet bbs users are now all over the world. */ char *getlocale(int val) { int i; static char langc[21]; for (i = 0; (charmap[i].ftncidx != FTNC_ERROR); i++) { if (val == charmap[i].ftncidx) { snprintf(langc, 20, "%s", charmap[i].lang); return langc; } } return (char *)"C"; } char *getchrsdesc(int val) { int i; static char desc[61]; for (i = 0; (charmap[i].ftncidx != FTNC_ERROR); i++) { if (val == charmap[i].ftncidx) { snprintf(desc, 60, "%s", charmap[i].desc); return desc; } } return (char *)"ERROR"; } /* * Initialize charset translation. Translation can be done in 2 stages * with UTF-8 as the common centre because for example translate between * CP438 and ISO-8859-1 doesn't work directly. If translation is needed * with one side is UTF-8, only one stage will be used. If two the same * charactersets are given, the translation is off. * On success return 0, on error return -1 and write errorlog. */ int chartran_init(char *fromset, char *toset, int loglvl) { loglevel = loglvl; #ifdef HAVE_ICONV_H if (use_tran1 || use_tran2) { WriteError("chartran_init() called while still open"); chartran_close(); } Syslog(loglevel, "chartran_init(%s, %s)", fromset, toset); if (strcmp(fromset, toset) == 0) { Syslog(loglevel, "nothing to translate"); return 0; } if (strcmp(fromset, (char *)"UTF-8")) { cd1 = iconv_open("UTF-8", fromset); if (cd1 == (iconv_t)-1) { WriteError("$chartran_init(%s, %s): iconv_open(UTF-8, %s) error", fromset, toset, fromset); return -1; } use_tran1 = TRUE; } if (strcmp(toset, (char *)"UTF-8")) { cd2 = iconv_open(toset, "UTF-8"); if (cd2 == (iconv_t)-1) { WriteError("$chartran_init(%s, %s): iconv_open(%s, UTF-8) error", fromset, toset, toset); if (use_tran1) { iconv_close(cd1); use_tran1 = FALSE; } return -1; } use_tran2 = TRUE; } return 0; #else /* * Without iconv support we silently return an error */ return -1; #endif } /* * Deinit active charset translation. */ void chartran_close(void) { #ifdef HAVE_ICONV_H Syslog(loglevel, "chartran_close()"); if (use_tran1) { iconv_close(cd1); use_tran1 = FALSE; } if (use_tran2) { iconv_close(cd2); use_tran2 = FALSE; } #endif } /* * Translate a string, chartran_init must have been called to register * the charactersets to translate between. */ char *chartran(char *input) { static char outbuf[4096]; #ifdef HAVE_ICONV_H static char temp[4096]; size_t rc, inSize, outSize; char *in, *out; #endif memset(&outbuf, 0, sizeof(outbuf)); #ifdef HAVE_ICONV_H memset(&temp, 0, sizeof(temp)); /* * Transparant */ if (!use_tran1 && !use_tran2) { strncpy(outbuf, input, sizeof(outbuf) -1); return outbuf; } /* * Translate to UTF-8 */ if (use_tran1 && !use_tran2) { inSize = strlen(input); outSize = sizeof(outbuf); in = input; out = outbuf; rc = iconv(cd1, &in, &inSize, &out, &outSize); if (rc == -1) { WriteError("$iconv(%s) cd1", printable(input, 0)); strncpy(outbuf, input, sizeof(outbuf) -1); } return outbuf; } /* * Translate from UTF-8 */ if (!use_tran1 && use_tran2) { inSize = strlen(input); outSize = sizeof(outbuf); in = input; out = outbuf; rc = iconv(cd2, &in, &inSize, &out, &outSize); if (rc == -1) { WriteError("$iconv(%s) cd2", printable(input, 0)); strncpy(outbuf, input, sizeof(outbuf) -1); } return outbuf; } /* * Double translation with UTF-8 as the middleman. */ inSize = strlen(input); outSize = sizeof(temp); in = input; out = temp; rc = iconv(cd1, &in, &inSize, &out, &outSize); if (rc == -1) { WriteError("$iconv(%s) cd1", printable(input, 0)); strncpy(outbuf, input, sizeof(outbuf) -1); return outbuf; } inSize = strlen(temp); outSize = sizeof(outbuf); in = temp; out = outbuf; rc = iconv(cd2, &in, &inSize, &out, &outSize); if (rc == -1) { WriteError("$iconv(%s) cd2", printable(temp, 0)); strncpy(outbuf, input, sizeof(outbuf) -1); } return outbuf; #else /* * Just copy without iconv */ strncpy(outbuf, input, sizeof(outbuf) -1); return outbuf; #endif }