crypto/dso/dso_win32.c

   1 /* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <string.h>
  61 #include "cryptlib.h"
  62 #include <openssl/dso.h>
  63
  64 #if !defined(DSO_WIN32)
  65 DSO_METHOD *DSO_METHOD_win32(void)
  66         {
  67         return NULL;
  68         }
  69 #else
  70
  71 #ifdef _WIN32_WCE
  72 # if _WIN32_WCE < 300
  73 static FARPROC GetProcAddressA(HMODULE hModule,LPCSTR lpProcName)
  74         {
  75         WCHAR lpProcNameW[64];
  76         int i;
  77
  78         for (i=0;lpProcName[i] && i<64;i++)
  79                 lpProcNameW[i] = (WCHAR)lpProcName[i];
  80         if (i==64) return NULL;
  81         lpProcNameW[i] = 0;
  82
  83         return GetProcAddressW(hModule,lpProcNameW);
  84         }
  85 # endif
  86 # undef GetProcAddress
  87 # define GetProcAddress GetProcAddressA
  88
  89 static HINSTANCE LoadLibraryA(LPCSTR lpLibFileName)
  90         {
  91         WCHAR *fnamw;
  92         size_t len_0=strlen(lpLibFileName)+1,i;
  93
  94 #ifdef _MSC_VER
  95         fnamw = (WCHAR *)_alloca (len_0*sizeof(WCHAR));
  96 #else
  97         fnamw = (WCHAR *)alloca (len_0*sizeof(WCHAR));
  98 #endif
  99         if (fnamw == NULL)
 100                 {
 101                 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 102                 return NULL;
 103                 }
 104
 105 #if defined(_WIN32_WCE) && _WIN32_WCE>=101
 106         if (!MultiByteToWideChar(CP_ACP,0,lpLibFileName,len_0,fnamw,len_0))
 107 #endif
 108                 for (i=0;i<len_0;i++) fnamw[i]=(WCHAR)lpLibFileName[i];
 109
 110         return LoadLibraryW(fnamw);
 111         }
 112 #endif
 113
 114 /* Part of the hack in "win32_load" ... */
 115 #define DSO_MAX_TRANSLATED_SIZE 256
 116
 117 static int win32_load(DSO *dso);
 118 static int win32_unload(DSO *dso);
 119 static void *win32_bind_var(DSO *dso, const char *symname);
 120 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
 121 #if 0
 122 static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
 123 static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
 124 static int win32_init(DSO *dso);
 125 static int win32_finish(DSO *dso);
 126 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
 127 #endif
 128 static char *win32_name_converter(DSO *dso, const char *filename);
 129 static char *win32_merger(DSO *dso, const char *filespec1,
 130         const char *filespec2);
 131 static int win32_pathbyaddr(void *addr,char *path,int sz);
 132
 133 static const char *openssl_strnchr(const char *string, int c, size_t len);
 134
 135 static DSO_METHOD dso_meth_win32 = {
 136         "OpenSSL 'win32' shared library method",
 137         win32_load,
 138         win32_unload,
 139         win32_bind_var,
 140         win32_bind_func,
 141 /* For now, "unbind" doesn't exist */
 142 #if 0
 143         NULL, /* unbind_var */
 144         NULL, /* unbind_func */
 145 #endif
 146         NULL, /* ctrl */
 147         win32_name_converter,
 148         win32_merger,
 149         NULL, /* init */
 150         NULL, /* finish */
 151         win32_pathbyaddr
 152         };
 153
 154 DSO_METHOD *DSO_METHOD_win32(void)
 155         {
 156         return(&dso_meth_win32);
 157         }
 158
 159 /* For this DSO_METHOD, our meth_data STACK will contain;
 160  * (i) a pointer to the handle (HINSTANCE) returned from
 161  *     LoadLibrary(), and copied.
 162  */
 163
 164 static int win32_load(DSO *dso)
 165         {
 166         HINSTANCE h = NULL, *p = NULL;
 167         /* See applicable comments from dso_dl.c */
 168         char *filename = DSO_convert_filename(dso, NULL);
 169
 170         if(filename == NULL)
 171                 {
 172                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 173                 goto err;
 174                 }
 175         h = LoadLibraryA(filename);
 176         if(h == NULL)
 177                 {
 178                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 179                 ERR_add_error_data(3, "filename(", filename, ")");
 180                 goto err;
 181                 }
 182         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 183         if(p == NULL)
 184                 {
 185                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 186                 goto err;
 187                 }
 188         *p = h;
 189         if(!sk_push(dso->meth_data, (char *)p))
 190                 {
 191                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 192                 goto err;
 193                 }
 194         /* Success */
 195         dso->loaded_filename = filename;
 196         return(1);
 197 err:
 198         /* Cleanup !*/
 199         if(filename != NULL)
 200                 OPENSSL_free(filename);
 201         if(p != NULL)
 202                 OPENSSL_free(p);
 203         if(h != NULL)
 204                 FreeLibrary(h);
 205         return(0);
 206         }
 207
 208 static int win32_unload(DSO *dso)
 209         {
 210         HINSTANCE *p;
 211         if(dso == NULL)
 212                 {
 213                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 214                 return(0);
 215                 }
 216         if(sk_num(dso->meth_data) < 1)
 217                 return(1);
 218         p = (HINSTANCE *)sk_pop(dso->meth_data);
 219         if(p == NULL)
 220                 {
 221                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 222                 return(0);
 223                 }
 224         if(!FreeLibrary(*p))
 225                 {
 226                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 227                 /* We should push the value back onto the stack in
 228                  * case of a retry. */
 229                 sk_push(dso->meth_data, (char *)p);
 230                 return(0);
 231                 }
 232         /* Cleanup */
 233         OPENSSL_free(p);
 234         return(1);
 235         }
 236
 237 /* Using GetProcAddress for variables? TODO: Check this out in
 238  * the Win32 API docs, there's probably a variant for variables. */
 239 static void *win32_bind_var(DSO *dso, const char *symname)
 240         {
 241         HINSTANCE *ptr;
 242         void *sym;
 243
 244         if((dso == NULL) || (symname == NULL))
 245                 {
 246                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 247                 return(NULL);
 248                 }
 249         if(sk_num(dso->meth_data) < 1)
 250                 {
 251                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 252                 return(NULL);
 253                 }
 254         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 255         if(ptr == NULL)
 256                 {
 257                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 258                 return(NULL);
 259                 }
 260         sym = GetProcAddress(*ptr, symname);
 261         if(sym == NULL)
 262                 {
 263                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 264                 ERR_add_error_data(3, "symname(", symname, ")");
 265                 return(NULL);
 266                 }
 267         return(sym);
 268         }
 269
 270 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 271         {
 272         HINSTANCE *ptr;
 273         void *sym;
 274
 275         if((dso == NULL) || (symname == NULL))
 276                 {
 277                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 278                 return(NULL);
 279                 }
 280         if(sk_num(dso->meth_data) < 1)
 281                 {
 282                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 283                 return(NULL);
 284                 }
 285         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 286         if(ptr == NULL)
 287                 {
 288                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 289                 return(NULL);
 290                 }
 291         sym = GetProcAddress(*ptr, symname);
 292         if(sym == NULL)
 293                 {
 294                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 295                 ERR_add_error_data(3, "symname(", symname, ")");
 296                 return(NULL);
 297                 }
 298         return((DSO_FUNC_TYPE)sym);
 299         }
 300
 301 struct file_st
 302         {
 303         const char *node; int nodelen;
 304         const char *device; int devicelen;
 305         const char *predir; int predirlen;
 306         const char *dir; int dirlen;
 307         const char *file; int filelen;
 308         };
 309
 310 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 311         int assume_last_is_dir)
 312         {
 313         struct file_st *result = NULL;
 314         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 315         const char *start = filename;
 316         char last;
 317
 318         if (!filename)
 319                 {
 320                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 321                 /*goto err;*/
 322                 return(NULL);
 323                 }
 324
 325         result = OPENSSL_malloc(sizeof(struct file_st));
 326         if(result == NULL)
 327                 {
 328                 DSOerr(DSO_F_WIN32_SPLITTER,
 329                         ERR_R_MALLOC_FAILURE);
 330                 return(NULL);
 331                 }
 332
 333         memset(result, 0, sizeof(struct file_st));
 334         position = IN_DEVICE;
 335
 336         if((filename[0] == '\\' && filename[1] == '\\')
 337                 || (filename[0] == '/' && filename[1] == '/'))
 338                 {
 339                 position = IN_NODE;
 340                 filename += 2;
 341                 start = filename;
 342                 result->node = start;
 343                 }
 344
 345         do
 346                 {
 347                 last = filename[0];
 348                 switch(last)
 349                         {
 350                 case ':':
 351                         if(position != IN_DEVICE)
 352                                 {
 353                                 DSOerr(DSO_F_WIN32_SPLITTER,
 354                                         DSO_R_INCORRECT_FILE_SYNTAX);
 355                                 /*goto err;*/
 356                                 return(NULL);
 357                                 }
 358                         result->device = start;
 359                         result->devicelen = filename - start;
 360                         position = IN_FILE;
 361                         start = ++filename;
 362                         result->dir = start;
 363                         break;
 364                 case '\\':
 365                 case '/':
 366                         if(position == IN_NODE)
 367                                 {
 368                                 result->nodelen = filename - start;
 369                                 position = IN_FILE;
 370                                 start = ++filename;
 371                                 result->dir = start;
 372                                 }
 373                         else if(position == IN_DEVICE)
 374                                 {
 375                                 position = IN_FILE;
 376                                 filename++;
 377                                 result->dir = start;
 378                                 result->dirlen = filename - start;
 379                                 start = filename;
 380                                 }
 381                         else
 382                                 {
 383                                 filename++;
 384                                 result->dirlen += filename - start;
 385                                 start = filename;
 386                                 }
 387                         break;
 388                 case '\0':
 389                         if(position == IN_NODE)
 390                                 {
 391                                 result->nodelen = filename - start;
 392                                 }
 393                         else
 394                                 {
 395                                 if(filename - start > 0)
 396                                         {
 397                                         if (assume_last_is_dir)
 398                                                 {
 399                                                 if (position == IN_DEVICE)
 400                                                         {
 401                                                         result->dir = start;
 402                                                         result->dirlen = 0;
 403                                                         }
 404                                                 result->dirlen +=
 405                                                         filename - start;
 406                                                 }
 407                                         else
 408                                                 {
 409                                                 result->file = start;
 410                                                 result->filelen =
 411                                                         filename - start;
 412                                                 }
 413                                         }
 414                                 }
 415                         break;
 416                 default:
 417                         filename++;
 418                         break;
 419                         }
 420                 }
 421         while(last);
 422
 423         if(!result->nodelen) result->node = NULL;
 424         if(!result->devicelen) result->device = NULL;
 425         if(!result->dirlen) result->dir = NULL;
 426         if(!result->filelen) result->file = NULL;
 427
 428         return(result);
 429         }
 430
 431 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 432         {
 433         int len = 0, offset = 0;
 434         char *result = NULL;
 435         const char *start;
 436
 437         if(!file_split)
 438                 {
 439                 DSOerr(DSO_F_WIN32_JOINER,
 440                                 ERR_R_PASSED_NULL_PARAMETER);
 441                 return(NULL);
 442                 }
 443         if(file_split->node)
 444                 {
 445                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 446                 if(file_split->predir || file_split->dir || file_split->file)
 447                         len++;  /* 1 for ending \ */
 448                 }
 449         else if(file_split->device)
 450                 {
 451                 len += file_split->devicelen + 1; /* 1 for ending : */
 452                 }
 453         len += file_split->predirlen;
 454         if(file_split->predir && (file_split->dir || file_split->file))
 455                 {
 456                 len++;  /* 1 for ending \ */
 457                 }
 458         len += file_split->dirlen;
 459         if(file_split->dir && file_split->file)
 460                 {
 461                 len++;  /* 1 for ending \ */
 462                 }
 463         len += file_split->filelen;
 464
 465         if(!len)
 466                 {
 467                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 468                 return(NULL);
 469                 }
 470
 471         result = OPENSSL_malloc(len + 1);
 472         if (!result)
 473                 {
 474                 DSOerr(DSO_F_WIN32_JOINER,
 475                         ERR_R_MALLOC_FAILURE);
 476                 return(NULL);
 477                 }
 478
 479         if(file_split->node)
 480                 {
 481                 strcpy(&result[offset], "\\\\"); offset += 2;
 482                 strncpy(&result[offset], file_split->node,
 483                         file_split->nodelen); offset += file_split->nodelen;
 484                 if(file_split->predir || file_split->dir || file_split->file)
 485                         {
 486                         result[offset] = '\\'; offset++;
 487                         }
 488                 }
 489         else if(file_split->device)
 490                 {
 491                 strncpy(&result[offset], file_split->device,
 492                         file_split->devicelen); offset += file_split->devicelen;
 493                 result[offset] = ':'; offset++;
 494                 }
 495         start = file_split->predir;
 496         while(file_split->predirlen > (start - file_split->predir))
 497                 {
 498                 const char *end = openssl_strnchr(start, '/',
 499                         file_split->predirlen - (start - file_split->predir));
 500                 if(!end)
 501                         end = start
 502                                 + file_split->predirlen
 503                                 - (start - file_split->predir);
 504                 strncpy(&result[offset], start,
 505                         end - start); offset += end - start;
 506                 result[offset] = '\\'; offset++;
 507                 start = end + 1;
 508                 }
 509 #if 0 /* Not needed, since the directory converter above already appeneded
 510          a backslash */
 511         if(file_split->predir && (file_split->dir || file_split->file))
 512                 {
 513                 result[offset] = '\\'; offset++;
 514                 }
 515 #endif
 516         start = file_split->dir;
 517         while(file_split->dirlen > (start - file_split->dir))
 518                 {
 519                 const char *end = openssl_strnchr(start, '/',
 520                         file_split->dirlen - (start - file_split->dir));
 521                 if(!end)
 522                         end = start
 523                                 + file_split->dirlen
 524                                 - (start - file_split->dir);
 525                 strncpy(&result[offset], start,
 526                         end - start); offset += end - start;
 527                 result[offset] = '\\'; offset++;
 528                 start = end + 1;
 529                 }
 530 #if 0 /* Not needed, since the directory converter above already appeneded
 531          a backslash */
 532         if(file_split->dir && file_split->file)
 533                 {
 534                 result[offset] = '\\'; offset++;
 535                 }
 536 #endif
 537         strncpy(&result[offset], file_split->file,
 538                 file_split->filelen); offset += file_split->filelen;
 539         result[offset] = '\0';
 540         return(result);
 541         }
 542
 543 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 544         {
 545         char *merged = NULL;
 546         struct file_st *filespec1_split = NULL;
 547         struct file_st *filespec2_split = NULL;
 548
 549         if(!filespec1 && !filespec2)
 550                 {
 551                 DSOerr(DSO_F_WIN32_MERGER,
 552                                 ERR_R_PASSED_NULL_PARAMETER);
 553                 return(NULL);
 554                 }
 555         if (!filespec2)
 556                 {
 557                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 558                 if(!merged)
 559                         {
 560                         DSOerr(DSO_F_WIN32_MERGER,
 561                                 ERR_R_MALLOC_FAILURE);
 562                         return(NULL);
 563                         }
 564                 strcpy(merged, filespec1);
 565                 }
 566         else if (!filespec1)
 567                 {
 568                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 569                 if(!merged)
 570                         {
 571                         DSOerr(DSO_F_WIN32_MERGER,
 572                                 ERR_R_MALLOC_FAILURE);
 573                         return(NULL);
 574                         }
 575                 strcpy(merged, filespec2);
 576                 }
 577         else
 578                 {
 579                 filespec1_split = win32_splitter(dso, filespec1, 1);
 580                 if (!filespec1_split)
 581                         {
 582                         DSOerr(DSO_F_WIN32_MERGER,
 583                                 ERR_R_MALLOC_FAILURE);
 584                         return(NULL);
 585                         }
 586                 filespec2_split = win32_splitter(dso, filespec2, 0);
 587                 if (!filespec2_split)
 588                         {
 589                         DSOerr(DSO_F_WIN32_MERGER,
 590                                 ERR_R_MALLOC_FAILURE);
 591                         OPENSSL_free(filespec1_split);
 592                         return(NULL);
 593                         }
 594
 595                 /* Fill in into filespec1_split */
 596                 if (!filespec1_split->node && !filespec1_split->device)
 597                         {
 598                         filespec1_split->node = filespec2_split->node;
 599                         filespec1_split->nodelen = filespec2_split->nodelen;
 600                         filespec1_split->device = filespec2_split->device;
 601                         filespec1_split->devicelen = filespec2_split->devicelen;
 602                         }
 603                 if (!filespec1_split->dir)
 604                         {
 605                         filespec1_split->dir = filespec2_split->dir;
 606                         filespec1_split->dirlen = filespec2_split->dirlen;
 607                         }
 608                 else if (filespec1_split->dir[0] != '\\'
 609                         && filespec1_split->dir[0] != '/')
 610                         {
 611                         filespec1_split->predir = filespec2_split->dir;
 612                         filespec1_split->predirlen = filespec2_split->dirlen;
 613                         }
 614                 if (!filespec1_split->file)
 615                         {
 616                         filespec1_split->file = filespec2_split->file;
 617                         filespec1_split->filelen = filespec2_split->filelen;
 618                         }
 619
 620                 merged = win32_joiner(dso, filespec1_split);
 621                 }
 622         return(merged);
 623         }
 624
 625 static char *win32_name_converter(DSO *dso, const char *filename)
 626         {
 627         char *translated;
 628         int len, transform;
 629
 630         len = strlen(filename);
 631         transform = ((strstr(filename, "/") == NULL) &&
 632                         (strstr(filename, "\\") == NULL) &&
 633                         (strstr(filename, ":") == NULL));
 634         if(transform)
 635                 /* We will convert this to "%s.dll" */
 636                 translated = OPENSSL_malloc(len + 5);
 637         else
 638                 /* We will simply duplicate filename */
 639                 translated = OPENSSL_malloc(len + 1);
 640         if(translated == NULL)
 641                 {
 642                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 643                                 DSO_R_NAME_TRANSLATION_FAILED);
 644                 return(NULL);
 645                 }
 646         if(transform)
 647                 sprintf(translated, "%s.dll", filename);
 648         else
 649                 sprintf(translated, "%s", filename);
 650         return(translated);
 651         }
 652
 653 static const char *openssl_strnchr(const char *string, int c, size_t len)
 654         {
 655         size_t i;
 656         const char *p;
 657         for (i = 0, p = string; i < len && *p; i++, p++)
 658                 {
 659                 if (*p == c)
 660                         return p;
 661                 }
 662         return NULL;
 663         }
 664
 665 #include <tlhelp32.h>
 666 #ifdef _WIN32_WCE
 667 # define DLLNAME "TOOLHELP.DLL"
 668 #else
 669 # ifdef MODULEENTRY32
 670 # undef MODULEENTRY32   /* unmask the ASCII version! */
 671 # endif
 672 # define DLLNAME "KERNEL32.DLL"
 673 #endif
 674
 675 typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
 676 typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE);
 677 typedef BOOL (WINAPI *MODULE32)(HANDLE, MODULEENTRY32 *);
 678
 679 static int win32_pathbyaddr(void *addr,char *path,int sz)
 680         {
 681         HMODULE dll;
 682         HANDLE hModuleSnap = INVALID_HANDLE_VALUE;
 683         MODULEENTRY32 me32;
 684         CREATETOOLHELP32SNAPSHOT create_snap;
 685         CLOSETOOLHELP32SNAPSHOT  close_snap;
 686         MODULE32 module_first, module_next;
 687         int len;
 688
 689         if (addr == NULL)
 690                 {
 691                 union   { int(*f)(void*,char*,int); void *p; } t =
 692                         { win32_pathbyaddr };
 693                 addr = t.p;
 694                 }
 695
 696         dll = LoadLibrary(TEXT(DLLNAME));
 697         if (dll == NULL)
 698                 {
 699                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 700                 return -1;
 701                 }
 702
 703         create_snap = (CREATETOOLHELP32SNAPSHOT)
 704                 GetProcAddress(dll,"CreateToolhelp32Snapshot");
 705         if (create_snap == NULL)
 706                 {
 707                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 708                 return -1;
 709                 }
 710         /* We take the rest for granted... */
 711 #ifdef _WIN32_WCE
 712         close_snap = (CLOSETOOLHELP32SNAPSHOT)
 713                 GetProcAddress(dll,"CloseToolhelp32Snapshot");
 714 #else
 715         close_snap = (CLOSETOOLHELP32SNAPSHOT)CloseHandle;
 716 #endif
 717         module_first = (MODULE32)GetProcAddress(dll,"Module32First");
 718         module_next  = (MODULE32)GetProcAddress(dll,"Module32Next");
 719
 720         hModuleSnap = (*create_snap)(TH32CS_SNAPMODULE,0);
 721         if( hModuleSnap == INVALID_HANDLE_VALUE )
 722                 {
 723                 FreeLibrary(dll);
 724                 DSOerr(DSO_F_PATHBYADDR,DSO_R_UNSUPPORTED);
 725                 return -1;
 726                 }
 727
 728         me32.dwSize = sizeof(me32);
 729
 730         if(!(*module_first)(hModuleSnap,&me32))
 731                 {
 732                 (*close_snap)(hModuleSnap);
 733                 FreeLibrary(dll);
 734                 DSOerr(DSO_F_PATHBYADDR,DSO_R_FAILURE);
 735                 return -1;
 736                 }
 737
 738         do      {
 739                 if ((BYTE *)addr >= me32.modBaseAddr &&
 740                     (BYTE *)addr <  me32.modBaseAddr+me32.modBaseSize)
 741                         {
 742                         (*close_snap)(hModuleSnap);
 743                         FreeLibrary(dll);
 744 #ifdef _WIN32_WCE
 745 # if _WIN32_WCE >= 101
 746                         return WideCharToMultiByte(CP_ACP,0,me32.szExePath,-1,
 747                                                         path,sz,NULL,NULL);
 748 # else
 749                         len = (int)wcslen(me32.szExePath);
 750                         if (sz <= 0) return len+1;
 751                         if (len >= sz) len=sz-1;
 752                         for(i=0;i<len;i++)
 753                                 path[i] = (char)me32.szExePath[i];
 754                         path[len++] = 0;
 755                         return len;
 756 # endif
 757 #else
 758                         len = (int)strlen(me32.szExePath);
 759                         if (sz <= 0) return len+1;
 760                         if (len >= sz) len=sz-1;
 761                         memcpy(path,me32.szExePath,len);
 762                         path[len++] = 0;
 763                         return len;
 764 #endif
 765                         }
 766                 } while((*module_next)(hModuleSnap, &me32));
 767
 768         (*close_snap)(hModuleSnap);
 769         FreeLibrary(dll);
 770         return 0;
 771         }
 772 #endif /* DSO_WIN32 */