iconv.c

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    1 /*
    2  * Copyright (c) 2000-2001, Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *    This product includes software developed by Boris Popov.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: src/sys/libkern/iconv.c,v 1.12.2.1.2.1 2009/04/15 03:14:26 kensmith Exp $
   33  * $DragonFly: src/sys/libiconv/iconv.c,v 1.8 2008/01/05 14:02:38 swildner Exp $
   34  */
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 #include <sys/iconv.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mount.h>
   42 #include <sys/syslog.h>
   43 #include "iconv_converter_if.h"
   44 
   45 SYSCTL_DECL(_kern_iconv);
   46 
   47 SYSCTL_NODE(_kern, OID_AUTO, iconv, CTLFLAG_RW, NULL, "kernel iconv interface");
   48 
   49 MALLOC_DEFINE(M_ICONV, "iconv", "ICONV structures");
   50 MALLOC_DEFINE(M_ICONVDATA, "iconv_data", "ICONV data");
   51 
   52 MODULE_VERSION(libiconv, 2);
   53 
   54 #ifdef notnow
   55 /*
   56  * iconv converter instance
   57  */
   58 struct iconv_converter {
   59         KOBJ_FIELDS;
   60         void *                  c_data;
   61 };
   62 #endif
   63 
   64 struct sysctl_oid *iconv_oid_hook = &sysctl___kern_iconv;
   65 
   66 /*
   67  * List of loaded converters
   68  */
   69 static TAILQ_HEAD(iconv_converter_list, iconv_converter_class)
   70     iconv_converters = TAILQ_HEAD_INITIALIZER(iconv_converters);
   71 
   72 /*
   73  * List of supported/loaded charsets pairs
   74  */
   75 static TAILQ_HEAD(, iconv_cspair)
   76     iconv_cslist = TAILQ_HEAD_INITIALIZER(iconv_cslist);
   77 static int iconv_csid = 1;
   78 
   79 static char iconv_unicode_string[] = "unicode"; /* save eight bytes when possible */
   80 
   81 static void iconv_unregister_cspair(struct iconv_cspair *csp);
   82 
   83 static int
   84 iconv_mod_unload(void)
   85 {
   86         struct iconv_cspair *csp;
   87 
   88         while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL) {
   89                 if (csp->cp_refcount)
   90                         return EBUSY;
   91         }
   92 
   93         while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL)
   94                 iconv_unregister_cspair(csp);
   95         return 0;
   96 }
   97 
   98 static int
   99 iconv_mod_handler(module_t mod, int type, void *data)
  100 {
  101         int error;
  102 
  103         switch (type) {
  104             case MOD_LOAD:
  105                 error = 0;
  106                 break;
  107             case MOD_UNLOAD:
  108                 error = iconv_mod_unload();
  109                 break;
  110             default:
  111                 error = EINVAL;
  112         }
  113         return error;
  114 }
  115 
  116 static moduledata_t iconv_mod = {
  117         "iconv", iconv_mod_handler, NULL
  118 };
  119 
  120 DECLARE_MODULE(iconv, iconv_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
  121 
  122 static int
  123 iconv_register_converter(struct iconv_converter_class *dcp)
  124 {
  125         kobj_class_instantiate((kobj_class_t)dcp);
  126         TAILQ_INSERT_TAIL(&iconv_converters, dcp, cc_link);
  127         return 0;
  128 }
  129 
  130 static int
  131 iconv_unregister_converter(struct iconv_converter_class *dcp)
  132 {
  133         if (dcp->refs != 1) {
  134                 ICDEBUG("converter has %d references left\n", dcp->refs);
  135                 return EBUSY;
  136         }
  137         TAILQ_REMOVE(&iconv_converters, dcp, cc_link);
  138         kobj_class_uninstantiate((kobj_class_t)dcp);
  139         return 0;
  140 }
  141 
  142 static int
  143 iconv_lookupconv(const char *name, struct iconv_converter_class **dcpp)
  144 {
  145         struct iconv_converter_class *dcp;
  146 
  147         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  148                 if (name == NULL)
  149                         continue;
  150                 if (strcmp(name, ICONV_CONVERTER_NAME(dcp)) == 0) {
  151                         if (dcpp)
  152                                 *dcpp = dcp;
  153                         return 0;
  154                 }
  155         }
  156         return ENOENT;
  157 }
  158 
  159 static int
  160 iconv_lookupcs(const char *to, const char *from, struct iconv_cspair **cspp)
  161 {
  162         struct iconv_cspair *csp;
  163 
  164         TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
  165                 if (strcmp(csp->cp_to, to) == 0 &&
  166                     strcmp(csp->cp_from, from) == 0) {
  167                         if (cspp)
  168                                 *cspp = csp;
  169                         return 0;
  170                 }
  171         }
  172         return ENOENT;
  173 }
  174 
  175 static int
  176 iconv_register_cspair(const char *to, const char *from,
  177         struct iconv_converter_class *dcp, void *data,
  178         struct iconv_cspair **cspp)
  179 {
  180         struct iconv_cspair *csp;
  181         char *cp;
  182         int csize, ucsto, ucsfrom;
  183 
  184         if (iconv_lookupcs(to, from, NULL) == 0)
  185                 return EEXIST;
  186         csize = sizeof(*csp);
  187         ucsto = strcmp(to, iconv_unicode_string) == 0;
  188         if (!ucsto)
  189                 csize += strlen(to) + 1;
  190         ucsfrom = strcmp(from, iconv_unicode_string) == 0;
  191         if (!ucsfrom)
  192                 csize += strlen(from) + 1;
  193         csp = kmalloc(csize, M_ICONV, M_WAITOK | M_ZERO);
  194         csp->cp_id = iconv_csid++;
  195         csp->cp_dcp = dcp;
  196         cp = (char*)(csp + 1);
  197         if (!ucsto) {
  198                 strcpy(cp, to);
  199                 csp->cp_to = cp;
  200                 cp += strlen(cp) + 1;
  201         } else
  202                 csp->cp_to = iconv_unicode_string;
  203         if (!ucsfrom) {
  204                 strcpy(cp, from);
  205                 csp->cp_from = cp;
  206         } else
  207                 csp->cp_from = iconv_unicode_string;
  208         csp->cp_data = data;
  209 
  210         TAILQ_INSERT_TAIL(&iconv_cslist, csp, cp_link);
  211         *cspp = csp;
  212         return 0;
  213 }
  214 
  215 static void
  216 iconv_unregister_cspair(struct iconv_cspair *csp)
  217 {
  218         TAILQ_REMOVE(&iconv_cslist, csp, cp_link);
  219         if (csp->cp_data)
  220                 kfree(csp->cp_data, M_ICONVDATA);
  221         kfree(csp, M_ICONV);
  222 }
  223 
  224 /*
  225  * Lookup and create an instance of converter.
  226  * Currently this layer didn't have associated 'instance' structure
  227  * to avoid unnesessary memory allocation.
  228  */
  229 int
  230 iconv_open(const char *to, const char *from, void **handle)
  231 {
  232         struct iconv_cspair *csp, *cspfrom, *cspto;
  233         struct iconv_converter_class *dcp;
  234         const char *cnvname;
  235         int error;
  236 
  237         /*
  238          * First, lookup fully qualified cspairs
  239          */
  240         error = iconv_lookupcs(to, from, &csp);
  241         if (error == 0)
  242                 return ICONV_CONVERTER_OPEN(csp->cp_dcp, csp, NULL, handle);
  243 
  244         /*
  245          * Well, nothing found. Now try to construct a composite conversion
  246          * ToDo: add a 'capability' field to converter
  247          */
  248         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  249                 cnvname = ICONV_CONVERTER_NAME(dcp);
  250                 if (cnvname == NULL)
  251                         continue;
  252                 error = iconv_lookupcs(cnvname, from, &cspfrom);
  253                 if (error)
  254                         continue;
  255                 error = iconv_lookupcs(to, cnvname, &cspto);
  256                 if (error)
  257                         continue;
  258                 /*
  259                  * Fine, we're found a pair which can be combined together
  260                  */
  261                 return ICONV_CONVERTER_OPEN(dcp, cspto, cspfrom, handle);
  262         }
  263         return ENOENT;
  264 }
  265 
  266 int
  267 iconv_close(void *handle)
  268 {
  269         return ICONV_CONVERTER_CLOSE(handle);
  270 }
  271 
  272 int
  273 iconv_conv(void *handle, const char **inbuf,
  274         size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
  275 {
  276         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, 0);
  277 }
  278 
  279 int
  280 iconv_conv_case(void *handle, const char **inbuf,
  281         size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
  282 {
  283         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, casetype);
  284 }
  285 
  286 int
  287 iconv_convchr(void *handle, const char **inbuf,
  288         size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
  289 {
  290         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, 0);
  291 }
  292 
  293 int
  294 iconv_convchr_case(void *handle, const char **inbuf,
  295         size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
  296 {
  297         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, casetype);
  298 }
  299 
  300 /*
  301  * Give a list of loaded converters. Each name terminated with 0.
  302  * An empty string terminates the list.
  303  */
  304 static int
  305 iconv_sysctl_drvlist(SYSCTL_HANDLER_ARGS)
  306 {
  307         struct iconv_converter_class *dcp;
  308         const char *name;
  309         char spc;
  310         int error;
  311 
  312         error = 0;
  313 
  314         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  315                 name = ICONV_CONVERTER_NAME(dcp);
  316                 if (name == NULL)
  317                         continue;
  318                 error = SYSCTL_OUT(req, name, strlen(name) + 1);
  319                 if (error)
  320                         break;
  321         }
  322         if (error)
  323                 return error;
  324         spc = 0;
  325         error = SYSCTL_OUT(req, &spc, sizeof(spc));
  326         return error;
  327 }
  328 
  329 SYSCTL_PROC(_kern_iconv, OID_AUTO, drvlist, CTLFLAG_RD | CTLTYPE_OPAQUE,
  330             NULL, 0, iconv_sysctl_drvlist, "S,xlat", "registered converters");
  331 
  332 /*
  333  * List all available charset pairs.
  334  */
  335 static int
  336 iconv_sysctl_cslist(SYSCTL_HANDLER_ARGS)
  337 {
  338         struct iconv_cspair *csp;
  339         struct iconv_cspair_info csi;
  340         int error;
  341 
  342         error = 0;
  343         bzero(&csi, sizeof(csi));
  344         csi.cs_version = ICONV_CSPAIR_INFO_VER;
  345 
  346         TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
  347                 csi.cs_id = csp->cp_id;
  348                 csi.cs_refcount = csp->cp_refcount;
  349                 csi.cs_base = csp->cp_base ? csp->cp_base->cp_id : 0;
  350                 strcpy(csi.cs_to, csp->cp_to);
  351                 strcpy(csi.cs_from, csp->cp_from);
  352                 error = SYSCTL_OUT(req, &csi, sizeof(csi));
  353                 if (error)
  354                         break;
  355         }
  356         return error;
  357 }
  358 
  359 SYSCTL_PROC(_kern_iconv, OID_AUTO, cslist, CTLFLAG_RD | CTLTYPE_OPAQUE,
  360             NULL, 0, iconv_sysctl_cslist, "S,xlat", "registered charset pairs");
  361 
  362 /*
  363  * Add new charset pair
  364  */
  365 static int
  366 iconv_sysctl_add(SYSCTL_HANDLER_ARGS)
  367 {
  368         struct iconv_converter_class *dcp;
  369         struct iconv_cspair *csp;
  370         struct iconv_add_in din;
  371         struct iconv_add_out dout;
  372         int error;
  373 
  374         error = SYSCTL_IN(req, &din, sizeof(din));
  375         if (error)
  376                 return error;
  377         if (din.ia_version != ICONV_ADD_VER)
  378                 return EINVAL;
  379         if (din.ia_datalen > ICONV_CSMAXDATALEN)
  380                 return EINVAL;
  381 
  382         /*
  383          * Make sure all user-supplied strings are terminated before
  384          * proceeding.
  385          *
  386          * XXX return EINVAL if strings are not properly terminated
  387          */
  388         din.ia_converter[ICONV_CNVNMAXLEN-1] = 0;
  389         din.ia_to[ICONV_CSNMAXLEN-1] = 0;
  390         din.ia_from[ICONV_CSNMAXLEN-1] = 0;
  391 
  392         if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
  393                 return EINVAL;
  394         error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);
  395         if (error)
  396                 return error;
  397         if (din.ia_datalen) {
  398                 csp->cp_data = kmalloc(din.ia_datalen, M_ICONVDATA, M_WAITOK);
  399                 error = copyin(din.ia_data, csp->cp_data, din.ia_datalen);
  400                 if (error)
  401                         goto bad;
  402         }
  403         dout.ia_csid = csp->cp_id;
  404         error = SYSCTL_OUT(req, &dout, sizeof(dout));
  405         if (error)
  406                 goto bad;
  407         ICDEBUG("%s => %s, %d bytes\n",din.ia_from, din.ia_to, din.ia_datalen);
  408         return 0;
  409 bad:
  410         iconv_unregister_cspair(csp);
  411         return error;
  412 }
  413 
  414 SYSCTL_PROC(_kern_iconv, OID_AUTO, add, CTLFLAG_RW | CTLTYPE_OPAQUE,
  415             NULL, 0, iconv_sysctl_add, "S,xlat", "register charset pair");
  416 
  417 /*
  418  * Default stubs for converters
  419  */
  420 int
  421 iconv_converter_initstub(struct iconv_converter_class *dp)
  422 {
  423         return 0;
  424 }
  425 
  426 int
  427 iconv_converter_donestub(struct iconv_converter_class *dp)
  428 {
  429         return 0;
  430 }
  431 
  432 int
  433 iconv_converter_handler(module_t mod, int type, void *data)
  434 {
  435         struct iconv_converter_class *dcp = data;
  436         int error;
  437 
  438         switch (type) {
  439             case MOD_LOAD:
  440                 error = iconv_register_converter(dcp);
  441                 if (error)
  442                         break;
  443                 error = ICONV_CONVERTER_INIT(dcp);
  444                 if (error)
  445                         iconv_unregister_converter(dcp);
  446                 break;
  447             case MOD_UNLOAD:
  448                 ICONV_CONVERTER_DONE(dcp);
  449                 error = iconv_unregister_converter(dcp);
  450                 break;
  451             default:
  452                 error = EINVAL;
  453         }
  454         return error;
  455 }
  456 
  457 /*
  458  * Common used functions (don't use with unicode)
  459  */
  460 char *
  461 iconv_convstr(void *handle, char *dst, const char *src)
  462 {
  463         char *p = dst;
  464         int error;
  465         size_t inlen, outlen;
  466 
  467         if (handle == NULL) {
  468                 strcpy(dst, src);
  469                 return dst;
  470         }
  471         inlen = outlen = strlen(src);
  472         error = iconv_conv(handle, NULL, NULL, &p, &outlen);
  473         if (error)
  474                 return NULL;
  475         error = iconv_conv(handle, &src, &inlen, &p, &outlen);
  476         if (error)
  477                 return NULL;
  478         *p = 0;
  479         return dst;
  480 }
  481 
  482 void *
  483 iconv_convmem(void *handle, void *dst, const void *src, int size)
  484 {
  485         const char *s = src;
  486         char *d = dst;
  487         size_t inlen, outlen;
  488         int error;
  489 
  490         if (size == 0)
  491                 return dst;
  492         if (handle == NULL) {
  493                 memcpy(dst, src, size);
  494                 return dst;
  495         }
  496         inlen = outlen = size;
  497         error = iconv_conv(handle, NULL, NULL, &d, &outlen);
  498         if (error)
  499                 return NULL;
  500         error = iconv_conv(handle, &s, &inlen, &d, &outlen);
  501         if (error)
  502                 return NULL;
  503         return dst;
  504 }
  505 
  506 int
  507 iconv_lookupcp(char **cpp, const char *s)
  508 {
  509         if (cpp == NULL) {
  510                 ICDEBUG("warning a NULL list passed\n", ""); /* XXX ISO variadic                                                                macros cannot
  511                                                                 leave out the
  512                                                                 variadic args */
  513                 return ENOENT;
  514         }
  515         for (; *cpp; cpp++)
  516                 if (strcmp(*cpp, s) == 0)
  517                         return 0;
  518         return ENOENT;
  519 }
  520 
  521 /*
  522  * Return if fsname is in use of not
  523  */
  524 int
  525 iconv_vfs_refcount(const char *fsname)
  526 {
  527         struct vfsconf *vfsp;
  528 
  529         vfsp = vfsconf_find_by_name(fsname);
  530         if (vfsp != NULL && vfsp->vfc_refcount > 0)
  531                 return (EBUSY);
  532         return (0);
  533 }
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FreeBSD/Linux Kernel Cross Reference sys/libiconv/iconv.c

FreeBSD/Linux Kernel Cross Reference
sys/libiconv/iconv.c
