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 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   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 
   44 #include "iconv_converter_if.h"
   45 
   46 SYSCTL_DECL(_kern_iconv);
   47 
   48 SYSCTL_NODE(_kern, OID_AUTO, iconv, CTLFLAG_RW, NULL, "kernel iconv interface");
   49 
   50 MALLOC_DEFINE(M_ICONV, "iconv", "ICONV structures");
   51 MALLOC_DEFINE(M_ICONVDATA, "iconv_data", "ICONV data");
   52 
   53 MODULE_VERSION(libiconv, 2);
   54 
   55 #ifdef notnow
   56 /*
   57  * iconv converter instance
   58  */
   59 struct iconv_converter {
   60         KOBJ_FIELDS;
   61         void *                  c_data;
   62 };
   63 #endif
   64 
   65 struct sysctl_oid *iconv_oid_hook = &sysctl___kern_iconv;
   66 
   67 /*
   68  * List of loaded converters
   69  */
   70 static TAILQ_HEAD(iconv_converter_list, iconv_converter_class)
   71     iconv_converters = TAILQ_HEAD_INITIALIZER(iconv_converters);
   72 
   73 /*
   74  * List of supported/loaded charsets pairs
   75  */
   76 static TAILQ_HEAD(, iconv_cspair)
   77     iconv_cslist = TAILQ_HEAD_INITIALIZER(iconv_cslist);
   78 static int iconv_csid = 1;
   79 
   80 static char iconv_unicode_string[] = "unicode"; /* save eight bytes when possible */
   81 
   82 static void iconv_unregister_cspair(struct iconv_cspair *csp);
   83 
   84 static int
   85 iconv_mod_unload(void)
   86 {
   87         struct iconv_cspair *csp;
   88 
   89         while ((csp = TAILQ_FIRST(&iconv_cslist)) != NULL) {
   90                 if (csp->cp_refcount)
   91                         return EBUSY;
   92                 iconv_unregister_cspair(csp);
   93         }
   94         return 0;
   95 }
   96 
   97 static int
   98 iconv_mod_handler(module_t mod, int type, void *data)
   99 {
  100         int error;
  101 
  102         switch (type) {
  103             case MOD_LOAD:
  104                 error = 0;
  105                 break;
  106             case MOD_UNLOAD:
  107                 error = iconv_mod_unload();
  108                 break;
  109             default:
  110                 error = EINVAL;
  111         }
  112         return error;
  113 }
  114 
  115 static moduledata_t iconv_mod = {
  116         "iconv", iconv_mod_handler, NULL
  117 };
  118 
  119 DECLARE_MODULE(iconv, iconv_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
  120 
  121 static int
  122 iconv_register_converter(struct iconv_converter_class *dcp)
  123 {
  124         kobj_class_compile((struct kobj_class*)dcp);
  125         dcp->refs++;
  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 have %d referenses left\n", dcp->refs);
  135                 return EBUSY;
  136         }
  137         TAILQ_REMOVE(&iconv_converters, dcp, cc_link);
  138         kobj_class_free((struct kobj_class*)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 = malloc(csize, M_ICONV, M_WAITOK);
  194         bzero(csp, csize);
  195         csp->cp_id = iconv_csid++;
  196         csp->cp_dcp = dcp;
  197         cp = (char*)(csp + 1);
  198         if (!ucsto) {
  199                 strcpy(cp, to);
  200                 csp->cp_to = cp;
  201                 cp += strlen(cp) + 1;
  202         } else
  203                 csp->cp_to = iconv_unicode_string;
  204         if (!ucsfrom) {
  205                 strcpy(cp, from);
  206                 csp->cp_from = cp;
  207         } else
  208                 csp->cp_from = iconv_unicode_string;
  209         csp->cp_data = data;
  210 
  211         TAILQ_INSERT_TAIL(&iconv_cslist, csp, cp_link);
  212         *cspp = csp;
  213         return 0;
  214 }
  215 
  216 static void
  217 iconv_unregister_cspair(struct iconv_cspair *csp)
  218 {
  219         TAILQ_REMOVE(&iconv_cslist, csp, cp_link);
  220         if (csp->cp_data)
  221                 free(csp->cp_data, M_ICONVDATA);
  222         free(csp, M_ICONV);
  223 }
  224 
  225 /*
  226  * Lookup and create an instance of converter.
  227  * Currently this layer didn't have associated 'instance' structure
  228  * to avoid unnesessary memory allocation.
  229  */
  230 int
  231 iconv_open(const char *to, const char *from, void **handle)
  232 {
  233         struct iconv_cspair *csp, *cspfrom, *cspto;
  234         struct iconv_converter_class *dcp;
  235         const char *cnvname;
  236         int error;
  237 
  238         /*
  239          * First, lookup fully qualified cspairs
  240          */
  241         error = iconv_lookupcs(to, from, &csp);
  242         if (error == 0)
  243                 return ICONV_CONVERTER_OPEN(csp->cp_dcp, csp, NULL, handle);
  244 
  245         /*
  246          * Well, nothing found. Now try to construct a composite conversion
  247          * ToDo: add a 'capability' field to converter
  248          */
  249         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  250                 cnvname = ICONV_CONVERTER_NAME(dcp);
  251                 if (cnvname == NULL)
  252                         continue;
  253                 error = iconv_lookupcs(cnvname, from, &cspfrom);
  254                 if (error)
  255                         continue;
  256                 error = iconv_lookupcs(to, cnvname, &cspto);
  257                 if (error)
  258                         continue;
  259                 /*
  260                  * Fine, we're found a pair which can be combined together
  261                  */
  262                 return ICONV_CONVERTER_OPEN(dcp, cspto, cspfrom, handle);
  263         }
  264         return ENOENT;
  265 }
  266 
  267 int
  268 iconv_close(void *handle)
  269 {
  270         return ICONV_CONVERTER_CLOSE(handle);
  271 }
  272 
  273 int
  274 iconv_conv(void *handle, const char **inbuf,
  275         size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
  276 {
  277         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, 0);
  278 }
  279 
  280 int
  281 iconv_conv_case(void *handle, const char **inbuf,
  282         size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
  283 {
  284         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 0, casetype);
  285 }
  286 
  287 int
  288 iconv_convchr(void *handle, const char **inbuf,
  289         size_t *inbytesleft, char **outbuf, size_t *outbytesleft)
  290 {
  291         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, 0);
  292 }
  293 
  294 int
  295 iconv_convchr_case(void *handle, const char **inbuf,
  296         size_t *inbytesleft, char **outbuf, size_t *outbytesleft, int casetype)
  297 {
  298         return ICONV_CONVERTER_CONV(handle, inbuf, inbytesleft, outbuf, outbytesleft, 1, casetype);
  299 }
  300 
  301 /*
  302  * Give a list of loaded converters. Each name terminated with 0.
  303  * An empty string terminates the list.
  304  */
  305 static int
  306 iconv_sysctl_drvlist(SYSCTL_HANDLER_ARGS)
  307 {
  308         struct iconv_converter_class *dcp;
  309         const char *name;
  310         char spc;
  311         int error;
  312 
  313         error = 0;
  314 
  315         TAILQ_FOREACH(dcp, &iconv_converters, cc_link) {
  316                 name = ICONV_CONVERTER_NAME(dcp);
  317                 if (name == NULL)
  318                         continue;
  319                 error = SYSCTL_OUT(req, name, strlen(name) + 1);
  320                 if (error)
  321                         break;
  322         }
  323         if (error)
  324                 return error;
  325         spc = 0;
  326         error = SYSCTL_OUT(req, &spc, sizeof(spc));
  327         return error;
  328 }
  329 
  330 SYSCTL_PROC(_kern_iconv, OID_AUTO, drvlist, CTLFLAG_RD | CTLTYPE_OPAQUE,
  331             NULL, 0, iconv_sysctl_drvlist, "S,xlat", "registered converters");
  332 
  333 /*
  334  * List all available charset pairs.
  335  */
  336 static int
  337 iconv_sysctl_cslist(SYSCTL_HANDLER_ARGS)
  338 {
  339         struct iconv_cspair *csp;
  340         struct iconv_cspair_info csi;
  341         int error;
  342 
  343         error = 0;
  344         bzero(&csi, sizeof(csi));
  345         csi.cs_version = ICONV_CSPAIR_INFO_VER;
  346 
  347         TAILQ_FOREACH(csp, &iconv_cslist, cp_link) {
  348                 csi.cs_id = csp->cp_id;
  349                 csi.cs_refcount = csp->cp_refcount;
  350                 csi.cs_base = csp->cp_base ? csp->cp_base->cp_id : 0;
  351                 strcpy(csi.cs_to, csp->cp_to);
  352                 strcpy(csi.cs_from, csp->cp_from);
  353                 error = SYSCTL_OUT(req, &csi, sizeof(csi));
  354                 if (error)
  355                         break;
  356         }
  357         return error;
  358 }
  359 
  360 SYSCTL_PROC(_kern_iconv, OID_AUTO, cslist, CTLFLAG_RD | CTLTYPE_OPAQUE,
  361             NULL, 0, iconv_sysctl_cslist, "S,xlat", "registered charset pairs");
  362 
  363 /*
  364  * Add new charset pair
  365  */
  366 static int
  367 iconv_sysctl_add(SYSCTL_HANDLER_ARGS)
  368 {
  369         struct iconv_converter_class *dcp;
  370         struct iconv_cspair *csp;
  371         struct iconv_add_in din;
  372         struct iconv_add_out dout;
  373         int error;
  374 
  375         error = SYSCTL_IN(req, &din, sizeof(din));
  376         if (error)
  377                 return error;
  378         if (din.ia_version != ICONV_ADD_VER)
  379                 return EINVAL;
  380         if (din.ia_datalen > ICONV_CSMAXDATALEN)
  381                 return EINVAL;
  382         if (strlen(din.ia_from) >= ICONV_CSNMAXLEN)
  383                 return EINVAL;
  384         if (strlen(din.ia_to) >= ICONV_CSNMAXLEN)
  385                 return EINVAL;
  386         if (strlen(din.ia_converter) >= ICONV_CNVNMAXLEN)
  387                 return EINVAL;
  388         if (iconv_lookupconv(din.ia_converter, &dcp) != 0)
  389                 return EINVAL;
  390         error = iconv_register_cspair(din.ia_to, din.ia_from, dcp, NULL, &csp);
  391         if (error)
  392                 return error;
  393         if (din.ia_datalen) {
  394                 csp->cp_data = malloc(din.ia_datalen, M_ICONVDATA, M_WAITOK);
  395                 error = copyin(din.ia_data, csp->cp_data, din.ia_datalen);
  396                 if (error)
  397                         goto bad;
  398         }
  399         dout.ia_csid = csp->cp_id;
  400         error = SYSCTL_OUT(req, &dout, sizeof(dout));
  401         if (error)
  402                 goto bad;
  403         ICDEBUG("%s => %s, %d bytes\n",din.ia_from, din.ia_to, din.ia_datalen);
  404         return 0;
  405 bad:
  406         iconv_unregister_cspair(csp);
  407         return error;
  408 }
  409 
  410 SYSCTL_PROC(_kern_iconv, OID_AUTO, add, CTLFLAG_RW | CTLTYPE_OPAQUE,
  411             NULL, 0, iconv_sysctl_add, "S,xlat", "register charset pair");
  412 
  413 /*
  414  * Default stubs for converters
  415  */
  416 int
  417 iconv_converter_initstub(struct iconv_converter_class *dp)
  418 {
  419         return 0;
  420 }
  421 
  422 int
  423 iconv_converter_donestub(struct iconv_converter_class *dp)
  424 {
  425         return 0;
  426 }
  427 
  428 int
  429 iconv_converter_handler(module_t mod, int type, void *data)
  430 {
  431         struct iconv_converter_class *dcp = data;
  432         int error;
  433 
  434         switch (type) {
  435             case MOD_LOAD:
  436                 error = iconv_register_converter(dcp);
  437                 if (error)
  438                         break;
  439                 error = ICONV_CONVERTER_INIT(dcp);
  440                 if (error)
  441                         iconv_unregister_converter(dcp);
  442                 break;
  443             case MOD_UNLOAD:
  444                 ICONV_CONVERTER_DONE(dcp);
  445                 error = iconv_unregister_converter(dcp);
  446                 break;
  447             default:
  448                 error = EINVAL;
  449         }
  450         return error;
  451 }
  452 
  453 /*
  454  * Common used functions (don't use with unicode)
  455  */
  456 char *
  457 iconv_convstr(void *handle, char *dst, const char *src)
  458 {
  459         char *p = dst;
  460         size_t inlen, outlen;
  461         int error;
  462 
  463         if (handle == NULL) {
  464                 strcpy(dst, src);
  465                 return dst;
  466         }
  467         inlen = outlen = strlen(src);
  468         error = iconv_conv(handle, NULL, NULL, &p, &outlen);
  469         if (error)
  470                 return NULL;
  471         error = iconv_conv(handle, &src, &inlen, &p, &outlen);
  472         if (error)
  473                 return NULL;
  474         *p = 0;
  475         return dst;
  476 }
  477 
  478 void *
  479 iconv_convmem(void *handle, void *dst, const void *src, int size)
  480 {
  481         const char *s = src;
  482         char *d = dst;
  483         size_t inlen, outlen;
  484         int error;
  485 
  486         if (size == 0)
  487                 return dst;
  488         if (handle == NULL) {
  489                 memcpy(dst, src, size);
  490                 return dst;
  491         }
  492         inlen = outlen = size;
  493         error = iconv_conv(handle, NULL, NULL, &d, &outlen);
  494         if (error)
  495                 return NULL;
  496         error = iconv_conv(handle, &s, &inlen, &d, &outlen);
  497         if (error)
  498                 return NULL;
  499         return dst;
  500 }
  501 
  502 int
  503 iconv_lookupcp(char **cpp, const char *s)
  504 {
  505         if (cpp == NULL) {
  506                 ICDEBUG("warning a NULL list passed\n", ""); /* XXX ISO variadic                                                                macros cannot
  507                                                                 leave out the
  508                                                                 variadic args */
  509                 return ENOENT;
  510         }
  511         for (; *cpp; cpp++)
  512                 if (strcmp(*cpp, s) == 0)
  513                         return 0;
  514         return ENOENT;
  515 }
  516 
  517 /*
  518  * Return if fsname is in use of not
  519  */
  520 int
  521 iconv_vfs_refcount(const char *fsname)
  522 {
  523         struct vfsconf *vfsp;
  524 
  525         vfsp = vfs_byname(fsname);
  526         if (vfsp != NULL && vfsp->vfc_refcount > 0)
  527                 return (EBUSY);
  528         return (0);
  529 }
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FreeBSD/Linux Kernel Cross Reference sys/libkern/iconv.c

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