autoconf/tea/win/nmakehlp.c

   1 /*
   2  * ----------------------------------------------------------------------------
   3  * nmakehlp.c --
   4  *
   5  *      This is used to fix limitations within nmake and the environment.
   6  *
   7  * Copyright (c) 2002 by David Gravereaux.
   8  * Copyright (c) 2006 by Pat Thoyts
   9  *
  10  * See the file "license.terms" for information on usage and redistribution of
  11  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  12  * ----------------------------------------------------------------------------
  13  */
  14
  15 #define _CRT_SECURE_NO_DEPRECATE
  16 #include <windows.h>
  17 #ifdef _MSC_VER
  18 #pragma comment (lib, "user32.lib")
  19 #pragma comment (lib, "kernel32.lib")
  20 #endif
  21 #include <stdio.h>
  22 #include <math.h>
  23
  24 /*
  25  * This library is required for x64 builds with _some_ versions of MSVC
  26  */
  27 #if defined(_M_IA64) || defined(_M_AMD64)
  28 #if _MSC_VER >= 1400 && _MSC_VER < 1500
  29 #pragma comment(lib, "bufferoverflowU")
  30 #endif
  31 #endif
  32
  33 /* ISO hack for dumb VC++ */
  34 #ifdef _MSC_VER
  35 #define   snprintf      _snprintf
  36 #endif
  37
  38
  39 /* protos */
  40
  41 static int CheckForCompilerFeature(const char *option);
  42 static int CheckForLinkerFeature(char **options, int count);
  43 static int IsIn(const char *string, const char *substring);
  44 static int SubstituteFile(const char *substs, const char *filename);
  45 static int QualifyPath(const char *path);
  46 static int LocateDependency(const char *keyfile);
  47 static const char *GetVersionFromFile(const char *filename, const char *match, int numdots);
  48 static DWORD WINAPI ReadFromPipe(LPVOID args);
  49
  50 /* globals */
  51
  52 #define CHUNK   25
  53 #define STATICBUFFERSIZE    1000
  54 typedef struct {
  55     HANDLE pipe;
  56     char buffer[STATICBUFFERSIZE];
  57 } pipeinfo;
  58
  59 pipeinfo Out = {INVALID_HANDLE_VALUE, ""};
  60 pipeinfo Err = {INVALID_HANDLE_VALUE, ""};
  61 \f
  62 /*
  63  * exitcodes: 0 == no, 1 == yes, 2 == error
  64  */
  65
  66 int
  67 main(
  68     int argc,
  69     char *argv[])
  70 {
  71     char msg[300];
  72     DWORD dwWritten;
  73     int chars;
  74     const char *s;
  75
  76     /*
  77      * Make sure children (cl.exe and link.exe) are kept quiet.
  78      */
  79
  80     SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
  81
  82     /*
  83      * Make sure the compiler and linker aren't effected by the outside world.
  84      */
  85
  86     SetEnvironmentVariable("CL", "");
  87     SetEnvironmentVariable("LINK", "");
  88
  89     if (argc > 1 && *argv[1] == '-') {
  90         switch (*(argv[1]+1)) {
  91         case 'c':
  92             if (argc != 3) {
  93                 chars = snprintf(msg, sizeof(msg) - 1,
  94                         "usage: %s -c <compiler option>\n"
  95                         "Tests for whether cl.exe supports an option\n"
  96                         "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
  97                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
  98                         &dwWritten, NULL);
  99                 return 2;
 100             }
 101             return CheckForCompilerFeature(argv[2]);
 102         case 'l':
 103             if (argc < 3) {
 104                 chars = snprintf(msg, sizeof(msg) - 1,
 105                         "usage: %s -l <linker option> ?<mandatory option> ...?\n"
 106                         "Tests for whether link.exe supports an option\n"
 107                         "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
 108                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
 109                         &dwWritten, NULL);
 110                 return 2;
 111             }
 112             return CheckForLinkerFeature(&argv[2], argc-2);
 113         case 'f':
 114             if (argc == 2) {
 115                 chars = snprintf(msg, sizeof(msg) - 1,
 116                         "usage: %s -f <string> <substring>\n"
 117                         "Find a substring within another\n"
 118                         "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
 119                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
 120                         &dwWritten, NULL);
 121                 return 2;
 122             } else if (argc == 3) {
 123                 /*
 124                  * If the string is blank, there is no match.
 125                  */
 126
 127                 return 0;
 128             } else {
 129                 return IsIn(argv[2], argv[3]);
 130             }
 131         case 's':
 132             if (argc == 2) {
 133                 chars = snprintf(msg, sizeof(msg) - 1,
 134                         "usage: %s -s <substitutions file> <file>\n"
 135                         "Perform a set of string map type substutitions on a file\n"
 136                         "exitcodes: 0\n",
 137                         argv[0]);
 138                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
 139                         &dwWritten, NULL);
 140                 return 2;
 141             }
 142             return SubstituteFile(argv[2], argv[3]);
 143         case 'V':
 144             if (argc != 4) {
 145                 chars = snprintf(msg, sizeof(msg) - 1,
 146                     "usage: %s -V filename matchstring\n"
 147                     "Extract a version from a file:\n"
 148                     "eg: pkgIndex.tcl \"package ifneeded http\"",
 149                     argv[0]);
 150                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
 151                     &dwWritten, NULL);
 152                 return 0;
 153             }
 154             s = GetVersionFromFile(argv[2], argv[3], *(argv[1]+2) - '0');
 155             if (s && *s) {
 156                 printf("%s\n", s);
 157                 return 0;
 158             } else
 159                 return 1; /* Version not found. Return non-0 exit code */
 160
 161         case 'Q':
 162             if (argc != 3) {
 163                 chars = snprintf(msg, sizeof(msg) - 1,
 164                     "usage: %s -Q path\n"
 165                     "Emit the fully qualified path\n"
 166                     "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
 167                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
 168                     &dwWritten, NULL);
 169                 return 2;
 170             }
 171             return QualifyPath(argv[2]);
 172
 173         case 'L':
 174             if (argc != 3) {
 175                 chars = snprintf(msg, sizeof(msg) - 1,
 176                     "usage: %s -L keypath\n"
 177                     "Emit the fully qualified path of directory containing keypath\n"
 178                     "exitcodes: 0 == success, 1 == not found, 2 == error\n", argv[0]);
 179                 WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
 180                     &dwWritten, NULL);
 181                 return 2;
 182             }
 183             return LocateDependency(argv[2]);
 184         }
 185     }
 186     chars = snprintf(msg, sizeof(msg) - 1,
 187             "usage: %s -c|-f|-l|-Q|-s|-V ...\n"
 188             "This is a little helper app to equalize shell differences between WinNT and\n"
 189             "Win9x and get nmake.exe to accomplish its job.\n",
 190             argv[0]);
 191     WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars, &dwWritten, NULL);
 192     return 2;
 193 }
 194 \f
 195 static int
 196 CheckForCompilerFeature(
 197     const char *option)
 198 {
 199     STARTUPINFO si;
 200     PROCESS_INFORMATION pi;
 201     SECURITY_ATTRIBUTES sa;
 202     DWORD threadID;
 203     char msg[300];
 204     BOOL ok;
 205     HANDLE hProcess, h, pipeThreads[2];
 206     char cmdline[100];
 207
 208     hProcess = GetCurrentProcess();
 209
 210     ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
 211     ZeroMemory(&si, sizeof(STARTUPINFO));
 212     si.cb = sizeof(STARTUPINFO);
 213     si.dwFlags   = STARTF_USESTDHANDLES;
 214     si.hStdInput = INVALID_HANDLE_VALUE;
 215
 216     ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
 217     sa.nLength = sizeof(SECURITY_ATTRIBUTES);
 218     sa.lpSecurityDescriptor = NULL;
 219     sa.bInheritHandle = FALSE;
 220
 221     /*
 222      * Create a non-inheritible pipe.
 223      */
 224
 225     CreatePipe(&Out.pipe, &h, &sa, 0);
 226
 227     /*
 228      * Dupe the write side, make it inheritible, and close the original.
 229      */
 230
 231     DuplicateHandle(hProcess, h, hProcess, &si.hStdOutput, 0, TRUE,
 232             DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
 233
 234     /*
 235      * Same as above, but for the error side.
 236      */
 237
 238     CreatePipe(&Err.pipe, &h, &sa, 0);
 239     DuplicateHandle(hProcess, h, hProcess, &si.hStdError, 0, TRUE,
 240             DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
 241
 242     /*
 243      * Base command line.
 244      */
 245
 246     lstrcpy(cmdline, "cl.exe -nologo -c -TC -Zs -X -Fp.\\_junk.pch ");
 247
 248     /*
 249      * Append our option for testing
 250      */
 251
 252     lstrcat(cmdline, option);
 253
 254     /*
 255      * Filename to compile, which exists, but is nothing and empty.
 256      */
 257
 258     lstrcat(cmdline, " .\\nul");
 259
 260     ok = CreateProcess(
 261             NULL,           /* Module name. */
 262             cmdline,        /* Command line. */
 263             NULL,           /* Process handle not inheritable. */
 264             NULL,           /* Thread handle not inheritable. */
 265             TRUE,           /* yes, inherit handles. */
 266             DETACHED_PROCESS, /* No console for you. */
 267             NULL,           /* Use parent's environment block. */
 268             NULL,           /* Use parent's starting directory. */
 269             &si,            /* Pointer to STARTUPINFO structure. */
 270             &pi);           /* Pointer to PROCESS_INFORMATION structure. */
 271
 272     if (!ok) {
 273         DWORD err = GetLastError();
 274         int chars = snprintf(msg, sizeof(msg) - 1,
 275                 "Tried to launch: \"%s\", but got error [%u]: ", cmdline, err);
 276
 277         FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|
 278                 FORMAT_MESSAGE_MAX_WIDTH_MASK, 0L, err, 0, (LPSTR)&msg[chars],
 279                 (300-chars), 0);
 280         WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, lstrlen(msg), &err,NULL);
 281         return 2;
 282     }
 283
 284     /*
 285      * Close our references to the write handles that have now been inherited.
 286      */
 287
 288     CloseHandle(si.hStdOutput);
 289     CloseHandle(si.hStdError);
 290
 291     WaitForInputIdle(pi.hProcess, 5000);
 292     CloseHandle(pi.hThread);
 293
 294     /*
 295      * Start the pipe reader threads.
 296      */
 297
 298     pipeThreads[0] = CreateThread(NULL, 0, ReadFromPipe, &Out, 0, &threadID);
 299     pipeThreads[1] = CreateThread(NULL, 0, ReadFromPipe, &Err, 0, &threadID);
 300
 301     /*
 302      * Block waiting for the process to end.
 303      */
 304
 305     WaitForSingleObject(pi.hProcess, INFINITE);
 306     CloseHandle(pi.hProcess);
 307
 308     /*
 309      * Wait for our pipe to get done reading, should it be a little slow.
 310      */
 311
 312     WaitForMultipleObjects(2, pipeThreads, TRUE, 500);
 313     CloseHandle(pipeThreads[0]);
 314     CloseHandle(pipeThreads[1]);
 315
 316     /*
 317      * Look for the commandline warning code in both streams.
 318      *  - in MSVC 6 & 7 we get D4002, in MSVC 8 we get D9002.
 319      */
 320
 321     return !(strstr(Out.buffer, "D4002") != NULL
 322              || strstr(Err.buffer, "D4002") != NULL
 323              || strstr(Out.buffer, "D9002") != NULL
 324              || strstr(Err.buffer, "D9002") != NULL
 325              || strstr(Out.buffer, "D2021") != NULL
 326              || strstr(Err.buffer, "D2021") != NULL);
 327 }
 328 \f
 329 static int
 330 CheckForLinkerFeature(
 331     char **options,
 332     int count)
 333 {
 334     STARTUPINFO si;
 335     PROCESS_INFORMATION pi;
 336     SECURITY_ATTRIBUTES sa;
 337     DWORD threadID;
 338     char msg[300];
 339     BOOL ok;
 340     HANDLE hProcess, h, pipeThreads[2];
 341     int i;
 342     char cmdline[255];
 343
 344     hProcess = GetCurrentProcess();
 345
 346     ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
 347     ZeroMemory(&si, sizeof(STARTUPINFO));
 348     si.cb = sizeof(STARTUPINFO);
 349     si.dwFlags   = STARTF_USESTDHANDLES;
 350     si.hStdInput = INVALID_HANDLE_VALUE;
 351
 352     ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
 353     sa.nLength = sizeof(SECURITY_ATTRIBUTES);
 354     sa.lpSecurityDescriptor = NULL;
 355     sa.bInheritHandle = TRUE;
 356
 357     /*
 358      * Create a non-inheritible pipe.
 359      */
 360
 361     CreatePipe(&Out.pipe, &h, &sa, 0);
 362
 363     /*
 364      * Dupe the write side, make it inheritible, and close the original.
 365      */
 366
 367     DuplicateHandle(hProcess, h, hProcess, &si.hStdOutput, 0, TRUE,
 368             DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
 369
 370     /*
 371      * Same as above, but for the error side.
 372      */
 373
 374     CreatePipe(&Err.pipe, &h, &sa, 0);
 375     DuplicateHandle(hProcess, h, hProcess, &si.hStdError, 0, TRUE,
 376             DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);
 377
 378     /*
 379      * Base command line.
 380      */
 381
 382     lstrcpy(cmdline, "link.exe -nologo ");
 383
 384     /*
 385      * Append our option for testing.
 386      */
 387
 388     for (i = 0; i < count; i++) {
 389         lstrcat(cmdline, " \"");
 390         lstrcat(cmdline, options[i]);
 391         lstrcat(cmdline, "\"");
 392     }
 393
 394     ok = CreateProcess(
 395             NULL,           /* Module name. */
 396             cmdline,        /* Command line. */
 397             NULL,           /* Process handle not inheritable. */
 398             NULL,           /* Thread handle not inheritable. */
 399             TRUE,           /* yes, inherit handles. */
 400             DETACHED_PROCESS, /* No console for you. */
 401             NULL,           /* Use parent's environment block. */
 402             NULL,           /* Use parent's starting directory. */
 403             &si,            /* Pointer to STARTUPINFO structure. */
 404             &pi);           /* Pointer to PROCESS_INFORMATION structure. */
 405
 406     if (!ok) {
 407         DWORD err = GetLastError();
 408         int chars = snprintf(msg, sizeof(msg) - 1,
 409                 "Tried to launch: \"%s\", but got error [%u]: ", cmdline, err);
 410
 411         FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|
 412                 FORMAT_MESSAGE_MAX_WIDTH_MASK, 0L, err, 0, (LPSTR)&msg[chars],
 413                 (300-chars), 0);
 414         WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, lstrlen(msg), &err,NULL);
 415         return 2;
 416     }
 417
 418     /*
 419      * Close our references to the write handles that have now been inherited.
 420      */
 421
 422     CloseHandle(si.hStdOutput);
 423     CloseHandle(si.hStdError);
 424
 425     WaitForInputIdle(pi.hProcess, 5000);
 426     CloseHandle(pi.hThread);
 427
 428     /*
 429      * Start the pipe reader threads.
 430      */
 431
 432     pipeThreads[0] = CreateThread(NULL, 0, ReadFromPipe, &Out, 0, &threadID);
 433     pipeThreads[1] = CreateThread(NULL, 0, ReadFromPipe, &Err, 0, &threadID);
 434
 435     /*
 436      * Block waiting for the process to end.
 437      */
 438
 439     WaitForSingleObject(pi.hProcess, INFINITE);
 440     CloseHandle(pi.hProcess);
 441
 442     /*
 443      * Wait for our pipe to get done reading, should it be a little slow.
 444      */
 445
 446     WaitForMultipleObjects(2, pipeThreads, TRUE, 500);
 447     CloseHandle(pipeThreads[0]);
 448     CloseHandle(pipeThreads[1]);
 449
 450     /*
 451      * Look for the commandline warning code in the stderr stream.
 452      */
 453
 454     return !(strstr(Out.buffer, "LNK1117") != NULL ||
 455             strstr(Err.buffer, "LNK1117") != NULL ||
 456             strstr(Out.buffer, "LNK4044") != NULL ||
 457             strstr(Err.buffer, "LNK4044") != NULL ||
 458             strstr(Out.buffer, "LNK4224") != NULL ||
 459             strstr(Err.buffer, "LNK4224") != NULL);
 460 }
 461 \f
 462 static DWORD WINAPI
 463 ReadFromPipe(
 464     LPVOID args)
 465 {
 466     pipeinfo *pi = (pipeinfo *) args;
 467     char *lastBuf = pi->buffer;
 468     DWORD dwRead;
 469     BOOL ok;
 470
 471   again:
 472     if (lastBuf - pi->buffer + CHUNK > STATICBUFFERSIZE) {
 473         CloseHandle(pi->pipe);
 474         return (DWORD)-1;
 475     }
 476     ok = ReadFile(pi->pipe, lastBuf, CHUNK, &dwRead, 0L);
 477     if (!ok || dwRead == 0) {
 478         CloseHandle(pi->pipe);
 479         return 0;
 480     }
 481     lastBuf += dwRead;
 482     goto again;
 483
 484     return 0;  /* makes the compiler happy */
 485 }
 486 \f
 487 static int
 488 IsIn(
 489     const char *string,
 490     const char *substring)
 491 {
 492     return (strstr(string, substring) != NULL);
 493 }
 494 \f
 495 /*
 496  * GetVersionFromFile --
 497  *      Looks for a match string in a file and then returns the version
 498  *      following the match where a version is anything acceptable to
 499  *      package provide or package ifneeded.
 500  */
 501
 502 static const char *
 503 GetVersionFromFile(
 504     const char *filename,
 505     const char *match,
 506     int numdots)
 507 {
 508     static char szBuffer[100];
 509     char *szResult = NULL;
 510     FILE *fp = fopen(filename, "rt");
 511
 512     if (fp != NULL) {
 513         /*
 514          * Read data until we see our match string.
 515          */
 516
 517         while (fgets(szBuffer, sizeof(szBuffer), fp) != NULL) {
 518             LPSTR p, q;
 519
 520             p = strstr(szBuffer, match);
 521             if (p != NULL) {
 522                 /*
 523                  * Skip to first digit after the match.
 524                  */
 525
 526                 p += strlen(match);
 527                 while (*p && !isdigit((unsigned char)*p)) {
 528                     ++p;
 529                 }
 530
 531                 /*
 532                  * Find ending whitespace.
 533                  */
 534
 535                 q = p;
 536                 while (*q && (strchr("0123456789.ab", *q)) && (((!strchr(".ab", *q)
 537                             && !strchr("ab", q[-1])) || --numdots))) {
 538                     ++q;
 539                 }
 540
 541                 *q = 0;
 542                 szResult = p;
 543                 break;
 544             }
 545         }
 546         fclose(fp);
 547     }
 548     return szResult;
 549 }
 550 \f
 551 /*
 552  * List helpers for the SubstituteFile function
 553  */
 554
 555 typedef struct list_item_t {
 556     struct list_item_t *nextPtr;
 557     char * key;
 558     char * value;
 559 } list_item_t;
 560
 561 /* insert a list item into the list (list may be null) */
 562 static list_item_t *
 563 list_insert(list_item_t **listPtrPtr, const char *key, const char *value)
 564 {
 565     list_item_t *itemPtr = (list_item_t *)malloc(sizeof(list_item_t));
 566     if (itemPtr) {
 567         itemPtr->key = strdup(key);
 568         itemPtr->value = strdup(value);
 569         itemPtr->nextPtr = NULL;
 570
 571         while(*listPtrPtr) {
 572             listPtrPtr = &(*listPtrPtr)->nextPtr;
 573         }
 574         *listPtrPtr = itemPtr;
 575     }
 576     return itemPtr;
 577 }
 578
 579 static void
 580 list_free(list_item_t **listPtrPtr)
 581 {
 582     list_item_t *tmpPtr, *listPtr = *listPtrPtr;
 583     while (listPtr) {
 584         tmpPtr = listPtr;
 585         listPtr = listPtr->nextPtr;
 586         free(tmpPtr->key);
 587         free(tmpPtr->value);
 588         free(tmpPtr);
 589     }
 590 }
 591 \f
 592 /*
 593  * SubstituteFile --
 594  *      As windows doesn't provide anything useful like sed and it's unreliable
 595  *      to use the tclsh you are building against (consider x-platform builds -
 596  *      eg compiling AMD64 target from IX86) we provide a simple substitution
 597  *      option here to handle autoconf style substitutions.
 598  *      The substitution file is whitespace and line delimited. The file should
 599  *      consist of lines matching the regular expression:
 600  *        \s*\S+\s+\S*$
 601  *
 602  *      Usage is something like:
 603  *        nmakehlp -S << $** > $@
 604  *        @PACKAGE_NAME@ $(PACKAGE_NAME)
 605  *        @PACKAGE_VERSION@ $(PACKAGE_VERSION)
 606  *        <<
 607  */
 608
 609 static int
 610 SubstituteFile(
 611     const char *substitutions,
 612     const char *filename)
 613 {
 614     static char szBuffer[1024], szCopy[1024];
 615     list_item_t *substPtr = NULL;
 616     FILE *fp, *sp;
 617
 618     fp = fopen(filename, "rt");
 619     if (fp != NULL) {
 620
 621         /*
 622          * Build a list of substutitions from the first filename
 623          */
 624
 625         sp = fopen(substitutions, "rt");
 626         if (sp != NULL) {
 627             while (fgets(szBuffer, sizeof(szBuffer), sp) != NULL) {
 628                 unsigned char *ks, *ke, *vs, *ve;
 629                 ks = (unsigned char*)szBuffer;
 630                 while (ks && *ks && isspace(*ks)) ++ks;
 631                 ke = ks;
 632                 while (ke && *ke && !isspace(*ke)) ++ke;
 633                 vs = ke;
 634                 while (vs && *vs && isspace(*vs)) ++vs;
 635                 ve = vs;
 636                 while (ve && *ve && !(*ve == '\r' || *ve == '\n')) ++ve;
 637                 *ke = 0, *ve = 0;
 638                 list_insert(&substPtr, (char*)ks, (char*)vs);
 639             }
 640             fclose(sp);
 641         }
 642
 643         /* debug: dump the list */
 644 #ifndef NDEBUG
 645         {
 646             int n = 0;
 647             list_item_t *p = NULL;
 648             for (p = substPtr; p != NULL; p = p->nextPtr, ++n) {
 649                 fprintf(stderr, "% 3d '%s' => '%s'\n", n, p->key, p->value);
 650             }
 651         }
 652 #endif
 653
 654         /*
 655          * Run the substitutions over each line of the input
 656          */
 657
 658         while (fgets(szBuffer, sizeof(szBuffer), fp) != NULL) {
 659             list_item_t *p = NULL;
 660             for (p = substPtr; p != NULL; p = p->nextPtr) {
 661                 char *m = strstr(szBuffer, p->key);
 662                 if (m) {
 663                     char *cp, *op, *sp;
 664                     cp = szCopy;
 665                     op = szBuffer;
 666                     while (op != m) *cp++ = *op++;
 667                     sp = p->value;
 668                     while (sp && *sp) *cp++ = *sp++;
 669                     op += strlen(p->key);
 670                     while (*op) *cp++ = *op++;
 671                     *cp = 0;
 672                     memcpy(szBuffer, szCopy, sizeof(szCopy));
 673                 }
 674             }
 675             printf("%s", szBuffer);
 676         }
 677
 678         list_free(&substPtr);
 679     }
 680     fclose(fp);
 681     return 0;
 682 }
 683 \f
 684 BOOL FileExists(LPCTSTR szPath)
 685 {
 686 #ifndef INVALID_FILE_ATTRIBUTES
 687     #define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
 688 #endif
 689     DWORD pathAttr = GetFileAttributes(szPath);
 690     return (pathAttr != INVALID_FILE_ATTRIBUTES &&
 691             !(pathAttr & FILE_ATTRIBUTE_DIRECTORY));
 692 }
 693 \f
 694
 695 /*
 696  * QualifyPath --
 697  *
 698  *      This composes the current working directory with a provided path
 699  *      and returns the fully qualified and normalized path.
 700  *      Mostly needed to setup paths for testing.
 701  */
 702
 703 static int
 704 QualifyPath(
 705     const char *szPath)
 706 {
 707     char szCwd[MAX_PATH + 1];
 708
 709     GetFullPathName(szPath, sizeof(szCwd)-1, szCwd, NULL);
 710     printf("%s\n", szCwd);
 711     return 0;
 712 }
 713
 714 /*
 715  * Implements LocateDependency for a single directory. See that command
 716  * for an explanation.
 717  * Returns 0 if found after printing the directory.
 718  * Returns 1 if not found but no errors.
 719  * Returns 2 on any kind of error
 720  * Basically, these are used as exit codes for the process.
 721  */
 722 static int LocateDependencyHelper(const char *dir, const char *keypath)
 723 {
 724     HANDLE hSearch;
 725     char path[MAX_PATH+1];
 726     size_t dirlen;
 727     int keylen, ret;
 728     WIN32_FIND_DATA finfo;
 729
 730     if (dir == NULL || keypath == NULL)
 731         return 2; /* Have no real error reporting mechanism into nmake */
 732     dirlen = strlen(dir);
 733     if ((dirlen + 3) > sizeof(path))
 734         return 2;
 735     strncpy(path, dir, dirlen);
 736     strncpy(path+dirlen, "\\*", 3);     /* Including terminating \0 */
 737     keylen = strlen(keypath);
 738
 739 #if 0 /* This function is not available in Visual C++ 6 */
 740     /*
 741      * Use numerics 0 -> FindExInfoStandard,
 742      * 1 -> FindExSearchLimitToDirectories,
 743      * as these are not defined in Visual C++ 6
 744      */
 745     hSearch = FindFirstFileEx(path, 0, &finfo, 1, NULL, 0);
 746 #else
 747     hSearch = FindFirstFile(path, &finfo);
 748 #endif
 749     if (hSearch == INVALID_HANDLE_VALUE)
 750         return 1; /* Not found */
 751
 752     /* Loop through all subdirs checking if the keypath is under there */
 753     ret = 1; /* Assume not found */
 754     do {
 755         int sublen;
 756         /*
 757          * We need to check it is a directory despite the
 758          * FindExSearchLimitToDirectories in the above call. See SDK docs
 759          */
 760         if ((finfo.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0)
 761             continue;
 762         sublen = strlen(finfo.cFileName);
 763         if ((dirlen+1+sublen+1+keylen+1) > sizeof(path))
 764             continue;           /* Path does not fit, assume not matched */
 765         strncpy(path+dirlen+1, finfo.cFileName, sublen);
 766         path[dirlen+1+sublen] = '\\';
 767         strncpy(path+dirlen+1+sublen+1, keypath, keylen+1);
 768         if (FileExists(path)) {
 769             /* Found a match, print to stdout */
 770             path[dirlen+1+sublen] = '\0';
 771             QualifyPath(path);
 772             ret = 0;
 773             break;
 774         }
 775     } while (FindNextFile(hSearch, &finfo));
 776     FindClose(hSearch);
 777     return ret;
 778 }
 779
 780 /*
 781  * LocateDependency --
 782  *
 783  *      Locates a dependency for a package.
 784  *        keypath - a relative path within the package directory
 785  *          that is used to confirm it is the correct directory.
 786  *      The search path for the package directory is currently only
 787  *      the parent and grandparent of the current working directory.
 788  *      If found, the command prints
 789  *         name_DIRPATH=<full path of located directory>
 790  *      and returns 0. If not found, does not print anything and returns 1.
 791  */
 792 static int LocateDependency(const char *keypath)
 793 {
 794     size_t i;
 795     int ret;
 796     static const char *paths[] = {"..", "..\\..", "..\\..\\.."};
 797
 798     for (i = 0; i < (sizeof(paths)/sizeof(paths[0])); ++i) {
 799         ret = LocateDependencyHelper(paths[i], keypath);
 800         if (ret == 0)
 801             return ret;
 802     }
 803     return ret;
 804 }
 805
 806
 807 /*
 808  * Local variables:
 809  *   mode: c
 810  *   c-basic-offset: 4
 811  *   fill-column: 78
 812  *   indent-tabs-mode: t
 813  *   tab-width: 8
 814  * End:
 815  */