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) return NULL;
 100
 101 #if defined(_WIN32_WCE) && _WIN32_WCE>=101
 102         if (!MultiByteToWideChar(CP_ACP,0,lpLibFileName,len_0,fnamw,len_0))
 103 #endif
 104                 for (i=0;i<len_0;i++) fnamw[i]=(WCHAR)lpLibFileName[i];
 105
 106         return LoadLibraryW(fnamw);
 107         }
 108 #endif
 109
 110 /* Part of the hack in "win32_load" ... */
 111 #define DSO_MAX_TRANSLATED_SIZE 256
 112
 113 static int win32_load(DSO *dso);
 114 static int win32_unload(DSO *dso);
 115 static void *win32_bind_var(DSO *dso, const char *symname);
 116 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname);
 117 #if 0
 118 static int win32_unbind_var(DSO *dso, char *symname, void *symptr);
 119 static int win32_unbind_func(DSO *dso, char *symname, DSO_FUNC_TYPE symptr);
 120 static int win32_init(DSO *dso);
 121 static int win32_finish(DSO *dso);
 122 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
 123 #endif
 124 static char *win32_name_converter(DSO *dso, const char *filename);
 125 static char *win32_merger(DSO *dso, const char *filespec1,
 126         const char *filespec2);
 127
 128 static const char *openssl_strnchr(const char *string, int c, size_t len);
 129
 130 static DSO_METHOD dso_meth_win32 = {
 131         "OpenSSL 'win32' shared library method",
 132         win32_load,
 133         win32_unload,
 134         win32_bind_var,
 135         win32_bind_func,
 136 /* For now, "unbind" doesn't exist */
 137 #if 0
 138         NULL, /* unbind_var */
 139         NULL, /* unbind_func */
 140 #endif
 141         NULL, /* ctrl */
 142         win32_name_converter,
 143         win32_merger,
 144         NULL, /* init */
 145         NULL  /* finish */
 146         };
 147
 148 DSO_METHOD *DSO_METHOD_win32(void)
 149         {
 150         return(&dso_meth_win32);
 151         }
 152
 153 /* For this DSO_METHOD, our meth_data STACK will contain;
 154  * (i) a pointer to the handle (HINSTANCE) returned from
 155  *     LoadLibrary(), and copied.
 156  */
 157
 158 static int win32_load(DSO *dso)
 159         {
 160         HINSTANCE h = NULL, *p = NULL;
 161         /* See applicable comments from dso_dl.c */
 162         char *filename = DSO_convert_filename(dso, NULL);
 163
 164         if(filename == NULL)
 165                 {
 166                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_NO_FILENAME);
 167                 goto err;
 168                 }
 169         h = LoadLibraryA(filename);
 170         if(h == NULL)
 171                 {
 172                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_LOAD_FAILED);
 173                 ERR_add_error_data(3, "filename(", filename, ")");
 174                 goto err;
 175                 }
 176         p = (HINSTANCE *)OPENSSL_malloc(sizeof(HINSTANCE));
 177         if(p == NULL)
 178                 {
 179                 DSOerr(DSO_F_WIN32_LOAD,ERR_R_MALLOC_FAILURE);
 180                 goto err;
 181                 }
 182         *p = h;
 183         if(!sk_push(dso->meth_data, (char *)p))
 184                 {
 185                 DSOerr(DSO_F_WIN32_LOAD,DSO_R_STACK_ERROR);
 186                 goto err;
 187                 }
 188         /* Success */
 189         dso->loaded_filename = filename;
 190         return(1);
 191 err:
 192         /* Cleanup !*/
 193         if(filename != NULL)
 194                 OPENSSL_free(filename);
 195         if(p != NULL)
 196                 OPENSSL_free(p);
 197         if(h != NULL)
 198                 FreeLibrary(h);
 199         return(0);
 200         }
 201
 202 static int win32_unload(DSO *dso)
 203         {
 204         HINSTANCE *p;
 205         if(dso == NULL)
 206                 {
 207                 DSOerr(DSO_F_WIN32_UNLOAD,ERR_R_PASSED_NULL_PARAMETER);
 208                 return(0);
 209                 }
 210         if(sk_num(dso->meth_data) < 1)
 211                 return(1);
 212         p = (HINSTANCE *)sk_pop(dso->meth_data);
 213         if(p == NULL)
 214                 {
 215                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_NULL_HANDLE);
 216                 return(0);
 217                 }
 218         if(!FreeLibrary(*p))
 219                 {
 220                 DSOerr(DSO_F_WIN32_UNLOAD,DSO_R_UNLOAD_FAILED);
 221                 /* We should push the value back onto the stack in
 222                  * case of a retry. */
 223                 sk_push(dso->meth_data, (char *)p);
 224                 return(0);
 225                 }
 226         /* Cleanup */
 227         OPENSSL_free(p);
 228         return(1);
 229         }
 230
 231 /* Using GetProcAddress for variables? TODO: Check this out in
 232  * the Win32 API docs, there's probably a variant for variables. */
 233 static void *win32_bind_var(DSO *dso, const char *symname)
 234         {
 235         HINSTANCE *ptr;
 236         void *sym;
 237
 238         if((dso == NULL) || (symname == NULL))
 239                 {
 240                 DSOerr(DSO_F_WIN32_BIND_VAR,ERR_R_PASSED_NULL_PARAMETER);
 241                 return(NULL);
 242                 }
 243         if(sk_num(dso->meth_data) < 1)
 244                 {
 245                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_STACK_ERROR);
 246                 return(NULL);
 247                 }
 248         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 249         if(ptr == NULL)
 250                 {
 251                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_NULL_HANDLE);
 252                 return(NULL);
 253                 }
 254         sym = GetProcAddress(*ptr, symname);
 255         if(sym == NULL)
 256                 {
 257                 DSOerr(DSO_F_WIN32_BIND_VAR,DSO_R_SYM_FAILURE);
 258                 ERR_add_error_data(3, "symname(", symname, ")");
 259                 return(NULL);
 260                 }
 261         return(sym);
 262         }
 263
 264 static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 265         {
 266         HINSTANCE *ptr;
 267         void *sym;
 268
 269         if((dso == NULL) || (symname == NULL))
 270                 {
 271                 DSOerr(DSO_F_WIN32_BIND_FUNC,ERR_R_PASSED_NULL_PARAMETER);
 272                 return(NULL);
 273                 }
 274         if(sk_num(dso->meth_data) < 1)
 275                 {
 276                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_STACK_ERROR);
 277                 return(NULL);
 278                 }
 279         ptr = (HINSTANCE *)sk_value(dso->meth_data, sk_num(dso->meth_data) - 1);
 280         if(ptr == NULL)
 281                 {
 282                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_NULL_HANDLE);
 283                 return(NULL);
 284                 }
 285         sym = GetProcAddress(*ptr, symname);
 286         if(sym == NULL)
 287                 {
 288                 DSOerr(DSO_F_WIN32_BIND_FUNC,DSO_R_SYM_FAILURE);
 289                 ERR_add_error_data(3, "symname(", symname, ")");
 290                 return(NULL);
 291                 }
 292         return((DSO_FUNC_TYPE)sym);
 293         }
 294
 295 struct file_st
 296         {
 297         const char *node; int nodelen;
 298         const char *device; int devicelen;
 299         const char *predir; int predirlen;
 300         const char *dir; int dirlen;
 301         const char *file; int filelen;
 302         };
 303
 304 static struct file_st *win32_splitter(DSO *dso, const char *filename,
 305         int assume_last_is_dir)
 306         {
 307         struct file_st *result = NULL;
 308         enum { IN_NODE, IN_DEVICE, IN_FILE } position;
 309         const char *start = filename;
 310         char last;
 311
 312         if (!filename)
 313                 {
 314                 DSOerr(DSO_F_WIN32_SPLITTER,DSO_R_NO_FILENAME);
 315                 /*goto err;*/
 316                 return(NULL);
 317                 }
 318
 319         result = OPENSSL_malloc(sizeof(struct file_st));
 320         if(result == NULL)
 321                 {
 322                 DSOerr(DSO_F_WIN32_SPLITTER,
 323                         ERR_R_MALLOC_FAILURE);
 324                 return(NULL);
 325                 }
 326
 327         memset(result, 0, sizeof(struct file_st));
 328         position = IN_DEVICE;
 329
 330         if((filename[0] == '\\' && filename[1] == '\\')
 331                 || (filename[0] == '/' && filename[1] == '/'))
 332                 {
 333                 position = IN_NODE;
 334                 filename += 2;
 335                 start = filename;
 336                 result->node = start;
 337                 }
 338
 339         do
 340                 {
 341                 last = filename[0];
 342                 switch(last)
 343                         {
 344                 case ':':
 345                         if(position != IN_DEVICE)
 346                                 {
 347                                 DSOerr(DSO_F_WIN32_SPLITTER,
 348                                         DSO_R_INCORRECT_FILE_SYNTAX);
 349                                 /*goto err;*/
 350                                 OPENSSL_free(result);
 351                                 return(NULL);
 352                                 }
 353                         result->device = start;
 354                         result->devicelen = filename - start;
 355                         position = IN_FILE;
 356                         start = ++filename;
 357                         result->dir = start;
 358                         break;
 359                 case '\\':
 360                 case '/':
 361                         if(position == IN_NODE)
 362                                 {
 363                                 result->nodelen = filename - start;
 364                                 position = IN_FILE;
 365                                 start = ++filename;
 366                                 result->dir = start;
 367                                 }
 368                         else if(position == IN_DEVICE)
 369                                 {
 370                                 position = IN_FILE;
 371                                 filename++;
 372                                 result->dir = start;
 373                                 result->dirlen = filename - start;
 374                                 start = filename;
 375                                 }
 376                         else
 377                                 {
 378                                 filename++;
 379                                 result->dirlen += filename - start;
 380                                 start = filename;
 381                                 }
 382                         break;
 383                 case '\0':
 384                         if(position == IN_NODE)
 385                                 {
 386                                 result->nodelen = filename - start;
 387                                 }
 388                         else
 389                                 {
 390                                 if(filename - start > 0)
 391                                         {
 392                                         if (assume_last_is_dir)
 393                                                 {
 394                                                 if (position == IN_DEVICE)
 395                                                         {
 396                                                         result->dir = start;
 397                                                         result->dirlen = 0;
 398                                                         }
 399                                                 result->dirlen +=
 400                                                         filename - start;
 401                                                 }
 402                                         else
 403                                                 {
 404                                                 result->file = start;
 405                                                 result->filelen =
 406                                                         filename - start;
 407                                                 }
 408                                         }
 409                                 }
 410                         break;
 411                 default:
 412                         filename++;
 413                         break;
 414                         }
 415                 }
 416         while(last);
 417
 418         if(!result->nodelen) result->node = NULL;
 419         if(!result->devicelen) result->device = NULL;
 420         if(!result->dirlen) result->dir = NULL;
 421         if(!result->filelen) result->file = NULL;
 422
 423         return(result);
 424         }
 425
 426 static char *win32_joiner(DSO *dso, const struct file_st *file_split)
 427         {
 428         int len = 0, offset = 0;
 429         char *result = NULL;
 430         const char *start;
 431
 432         if(!file_split)
 433                 {
 434                 DSOerr(DSO_F_WIN32_JOINER,
 435                                 ERR_R_PASSED_NULL_PARAMETER);
 436                 return(NULL);
 437                 }
 438         if(file_split->node)
 439                 {
 440                 len += 2 + file_split->nodelen; /* 2 for starting \\ */
 441                 if(file_split->predir || file_split->dir || file_split->file)
 442                         len++;  /* 1 for ending \ */
 443                 }
 444         else if(file_split->device)
 445                 {
 446                 len += file_split->devicelen + 1; /* 1 for ending : */
 447                 }
 448         len += file_split->predirlen;
 449         if(file_split->predir && (file_split->dir || file_split->file))
 450                 {
 451                 len++;  /* 1 for ending \ */
 452                 }
 453         len += file_split->dirlen;
 454         if(file_split->dir && file_split->file)
 455                 {
 456                 len++;  /* 1 for ending \ */
 457                 }
 458         len += file_split->filelen;
 459
 460         if(!len)
 461                 {
 462                 DSOerr(DSO_F_WIN32_JOINER, DSO_R_EMPTY_FILE_STRUCTURE);
 463                 return(NULL);
 464                 }
 465
 466         result = OPENSSL_malloc(len + 1);
 467         if (!result)
 468                 {
 469                 DSOerr(DSO_F_WIN32_JOINER,
 470                         ERR_R_MALLOC_FAILURE);
 471                 return(NULL);
 472                 }
 473
 474         if(file_split->node)
 475                 {
 476                 strcpy(&result[offset], "\\\\"); offset += 2;
 477                 strncpy(&result[offset], file_split->node,
 478                         file_split->nodelen); offset += file_split->nodelen;
 479                 if(file_split->predir || file_split->dir || file_split->file)
 480                         {
 481                         result[offset] = '\\'; offset++;
 482                         }
 483                 }
 484         else if(file_split->device)
 485                 {
 486                 strncpy(&result[offset], file_split->device,
 487                         file_split->devicelen); offset += file_split->devicelen;
 488                 result[offset] = ':'; offset++;
 489                 }
 490         start = file_split->predir;
 491         while(file_split->predirlen > (start - file_split->predir))
 492                 {
 493                 const char *end = openssl_strnchr(start, '/',
 494                         file_split->predirlen - (start - file_split->predir));
 495                 if(!end)
 496                         end = start
 497                                 + file_split->predirlen
 498                                 - (start - file_split->predir);
 499                 strncpy(&result[offset], start,
 500                         end - start); offset += end - start;
 501                 result[offset] = '\\'; offset++;
 502                 start = end + 1;
 503                 }
 504 #if 0 /* Not needed, since the directory converter above already appeneded
 505          a backslash */
 506         if(file_split->predir && (file_split->dir || file_split->file))
 507                 {
 508                 result[offset] = '\\'; offset++;
 509                 }
 510 #endif
 511         start = file_split->dir;
 512         while(file_split->dirlen > (start - file_split->dir))
 513                 {
 514                 const char *end = openssl_strnchr(start, '/',
 515                         file_split->dirlen - (start - file_split->dir));
 516                 if(!end)
 517                         end = start
 518                                 + file_split->dirlen
 519                                 - (start - file_split->dir);
 520                 strncpy(&result[offset], start,
 521                         end - start); offset += end - start;
 522                 result[offset] = '\\'; offset++;
 523                 start = end + 1;
 524                 }
 525 #if 0 /* Not needed, since the directory converter above already appeneded
 526          a backslash */
 527         if(file_split->dir && file_split->file)
 528                 {
 529                 result[offset] = '\\'; offset++;
 530                 }
 531 #endif
 532         strncpy(&result[offset], file_split->file,
 533                 file_split->filelen); offset += file_split->filelen;
 534         result[offset] = '\0';
 535         return(result);
 536         }
 537
 538 static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
 539         {
 540         char *merged = NULL;
 541         struct file_st *filespec1_split = NULL;
 542         struct file_st *filespec2_split = NULL;
 543
 544         if(!filespec1 && !filespec2)
 545                 {
 546                 DSOerr(DSO_F_WIN32_MERGER,
 547                                 ERR_R_PASSED_NULL_PARAMETER);
 548                 return(NULL);
 549                 }
 550         if (!filespec2)
 551                 {
 552                 merged = OPENSSL_malloc(strlen(filespec1) + 1);
 553                 if(!merged)
 554                         {
 555                         DSOerr(DSO_F_WIN32_MERGER,
 556                                 ERR_R_MALLOC_FAILURE);
 557                         return(NULL);
 558                         }
 559                 strcpy(merged, filespec1);
 560                 }
 561         else if (!filespec1)
 562                 {
 563                 merged = OPENSSL_malloc(strlen(filespec2) + 1);
 564                 if(!merged)
 565                         {
 566                         DSOerr(DSO_F_WIN32_MERGER,
 567                                 ERR_R_MALLOC_FAILURE);
 568                         return(NULL);
 569                         }
 570                 strcpy(merged, filespec2);
 571                 }
 572         else
 573                 {
 574                 filespec1_split = win32_splitter(dso, filespec1, 0);
 575                 if (!filespec1_split)
 576                         {
 577                         DSOerr(DSO_F_WIN32_MERGER,
 578                                 ERR_R_MALLOC_FAILURE);
 579                         return(NULL);
 580                         }
 581                 filespec2_split = win32_splitter(dso, filespec2, 1);
 582                 if (!filespec2_split)
 583                         {
 584                         DSOerr(DSO_F_WIN32_MERGER,
 585                                 ERR_R_MALLOC_FAILURE);
 586                         OPENSSL_free(filespec1_split);
 587                         return(NULL);
 588                         }
 589
 590                 /* Fill in into filespec1_split */
 591                 if (!filespec1_split->node && !filespec1_split->device)
 592                         {
 593                         filespec1_split->node = filespec2_split->node;
 594                         filespec1_split->nodelen = filespec2_split->nodelen;
 595                         filespec1_split->device = filespec2_split->device;
 596                         filespec1_split->devicelen = filespec2_split->devicelen;
 597                         }
 598                 if (!filespec1_split->dir)
 599                         {
 600                         filespec1_split->dir = filespec2_split->dir;
 601                         filespec1_split->dirlen = filespec2_split->dirlen;
 602                         }
 603                 else if (filespec1_split->dir[0] != '\\'
 604                         && filespec1_split->dir[0] != '/')
 605                         {
 606                         filespec1_split->predir = filespec2_split->dir;
 607                         filespec1_split->predirlen = filespec2_split->dirlen;
 608                         }
 609                 if (!filespec1_split->file)
 610                         {
 611                         filespec1_split->file = filespec2_split->file;
 612                         filespec1_split->filelen = filespec2_split->filelen;
 613                         }
 614
 615                 merged = win32_joiner(dso, filespec1_split);
 616                 }
 617         OPENSSL_free(filespec1_split);
 618         OPENSSL_free(filespec2_split);
 619         return(merged);
 620         }
 621
 622 static char *win32_name_converter(DSO *dso, const char *filename)
 623         {
 624         char *translated;
 625         int len, transform;
 626
 627         len = strlen(filename);
 628         transform = ((strstr(filename, "/") == NULL) &&
 629                         (strstr(filename, "\\") == NULL) &&
 630                         (strstr(filename, ":") == NULL));
 631         if(transform)
 632                 /* We will convert this to "%s.dll" */
 633                 translated = OPENSSL_malloc(len + 5);
 634         else
 635                 /* We will simply duplicate filename */
 636                 translated = OPENSSL_malloc(len + 1);
 637         if(translated == NULL)
 638                 {
 639                 DSOerr(DSO_F_WIN32_NAME_CONVERTER,
 640                                 DSO_R_NAME_TRANSLATION_FAILED);
 641                 return(NULL);
 642                 }
 643         if(transform)
 644                 sprintf(translated, "%s.dll", filename);
 645         else
 646                 sprintf(translated, "%s", filename);
 647         return(translated);
 648         }
 649
 650 static const char *openssl_strnchr(const char *string, int c, size_t len)
 651         {
 652         size_t i;
 653         const char *p;
 654         for (i = 0, p = string; i < len && *p; i++, p++)
 655                 {
 656                 if (*p == c)
 657                         return p;
 658                 }
 659         return NULL;
 660         }
 661
 662
 663 #endif /* OPENSSL_SYS_WIN32 */