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nmakehlp.c

/*
 * ----------------------------------------------------------------------------
 * nmakehlp.c --
 *
 *    This is used to fix limitations within nmake and the environment.
 *
 * Copyright (c) 2002 by David Gravereaux.
 * Copyright (c) 2006 by Pat Thoyts
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * ----------------------------------------------------------------------------
 * RCS: @(#) $Id: nmakehlp.c,v 1.21 2007/12/14 02:27:11 patthoyts Exp $
 * ----------------------------------------------------------------------------
 */

#define _CRT_SECURE_NO_DEPRECATE
#include <windows.h>
#pragma comment (lib, "user32.lib")
#pragma comment (lib, "kernel32.lib")
#include <stdio.h>
#include <math.h>

/*
 * This library is required for x64 builds with _some_ versions
 */
#if defined(_M_IA64) || defined(_M_AMD64)
#if _MSC_FULL_VER > 140000000 && _MSC_FULL_VER <= 140040310
#pragma comment(lib, "bufferoverflowU")
#endif
#endif

/* ISO hack for dumb VC++ */
#ifdef _MSC_VER
#define   snprintf      _snprintf
#endif



/* protos */

int         CheckForCompilerFeature(const char *option);
int         CheckForLinkerFeature(const char *option);
int         IsIn(const char *string, const char *substring);
int         GrepForDefine(const char *file, const char *string);
int         SubstituteFile(const char *substs, const char *filename);
const char *    GetVersionFromFile(const char *filename, const char *match);
DWORD WINAPI      ReadFromPipe(LPVOID args);

/* globals */

#define CHUNK     25
#define STATICBUFFERSIZE    1000
typedef struct {
    HANDLE pipe;
    char buffer[STATICBUFFERSIZE];
} pipeinfo;

pipeinfo Out = {INVALID_HANDLE_VALUE, '\0'};
pipeinfo Err = {INVALID_HANDLE_VALUE, '\0'};

/*
 * exitcodes: 0 == no, 1 == yes, 2 == error
 */

int
main(
    int argc,
    char *argv[])
{
    char msg[300];
    DWORD dwWritten;
    int chars;

    /*
     * Make sure children (cl.exe and link.exe) are kept quiet.
     */

    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);

    /*
     * Make sure the compiler and linker aren't effected by the outside world.
     */

    SetEnvironmentVariable("CL", "");
    SetEnvironmentVariable("LINK", "");

    if (argc > 1 && *argv[1] == '-') {
      switch (*(argv[1]+1)) {
      case 'c':
          if (argc != 3) {
            chars = snprintf(msg, sizeof(msg) - 1,
                    "usage: %s -c <compiler option>\n"
                  "Tests for whether cl.exe supports an option\n"
                  "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
            WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
                  &dwWritten, NULL);
            return 2;
          }
          return CheckForCompilerFeature(argv[2]);
      case 'l':
          if (argc != 3) {
            chars = snprintf(msg, sizeof(msg) - 1,
                        "usage: %s -l <linker option>\n"
                  "Tests for whether link.exe supports an option\n"
                  "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
            WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
                  &dwWritten, NULL);
            return 2;
          }
          return CheckForLinkerFeature(argv[2]);
      case 'f':
          if (argc == 2) {
            chars = snprintf(msg, sizeof(msg) - 1,
                  "usage: %s -f <string> <substring>\n"
                  "Find a substring within another\n"
                  "exitcodes: 0 == no, 1 == yes, 2 == error\n", argv[0]);
            WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
                  &dwWritten, NULL);
            return 2;
          } else if (argc == 3) {
            /*
             * If the string is blank, there is no match.
             */

            return 0;
          } else {
            return IsIn(argv[2], argv[3]);
          }
      case 'g':
          if (argc == 2) {
            chars = snprintf(msg, sizeof(msg) - 1,
                  "usage: %s -g <file> <string>\n"
                  "grep for a #define\n"
                  "exitcodes: integer of the found string (no decimals)\n",
                  argv[0]);
            WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
                  &dwWritten, NULL);
            return 2;
          }
          return GrepForDefine(argv[2], argv[3]);
      case 's':
          if (argc == 2) {
            chars = snprintf(msg, sizeof(msg) - 1,
                  "usage: %s -s <substitutions file> <file>\n"
                  "Perform a set of string map type substutitions on a file\n"
                  "exitcodes: 0\n",
                  argv[0]);
            WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
                  &dwWritten, NULL);
            return 2;
          }
          return SubstituteFile(argv[2], argv[3]);
      case 'V':
          if (argc != 4) {
            chars = snprintf(msg, sizeof(msg) - 1,
                "usage: %s -V filename matchstring\n"
                "Extract a version from a file:\n"
                "eg: pkgIndex.tcl \"package ifneeded http\"",
                argv[0]);
            WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars,
                &dwWritten, NULL);
            return 0;
          }
          printf("%s\n", GetVersionFromFile(argv[2], argv[3]));
          return 0;
      }
    }
    chars = snprintf(msg, sizeof(msg) - 1,
          "usage: %s -c|-l|-f|-g|-V ...\n"
          "This is a little helper app to equalize shell differences between WinNT and\n"
          "Win9x and get nmake.exe to accomplish its job.\n",
          argv[0]);
    WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg, chars, &dwWritten, NULL);
    return 2;
}

int
CheckForCompilerFeature(
    const char *option)
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    SECURITY_ATTRIBUTES sa;
    DWORD threadID;
    char msg[300];
    BOOL ok;
    HANDLE hProcess, h, pipeThreads[2];
    char cmdline[100];

    hProcess = GetCurrentProcess();

    ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
    ZeroMemory(&si, sizeof(STARTUPINFO));
    si.cb = sizeof(STARTUPINFO);
    si.dwFlags   = STARTF_USESTDHANDLES;
    si.hStdInput = INVALID_HANDLE_VALUE;

    ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = FALSE;

    /*
     * Create a non-inheritible pipe.
     */

    CreatePipe(&Out.pipe, &h, &sa, 0);

    /*
     * Dupe the write side, make it inheritible, and close the original.
     */

    DuplicateHandle(hProcess, h, hProcess, &si.hStdOutput, 0, TRUE,
          DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);

    /*
     * Same as above, but for the error side.
     */

    CreatePipe(&Err.pipe, &h, &sa, 0);
    DuplicateHandle(hProcess, h, hProcess, &si.hStdError, 0, TRUE,
          DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);

    /*
     * Base command line.
     */

    lstrcpy(cmdline, "cl.exe -nologo -c -TC -Zs -X -Fp.\\_junk.pch ");

    /*
     * Append our option for testing
     */

    lstrcat(cmdline, option);

    /*
     * Filename to compile, which exists, but is nothing and empty.
     */

    lstrcat(cmdline, " .\\nul");

    ok = CreateProcess(
          NULL,       /* Module name. */
          cmdline,          /* Command line. */
          NULL,       /* Process handle not inheritable. */
          NULL,       /* Thread handle not inheritable. */
          TRUE,       /* yes, inherit handles. */
          DETACHED_PROCESS, /* No console for you. */
          NULL,       /* Use parent's environment block. */
          NULL,       /* Use parent's starting directory. */
          &si,        /* Pointer to STARTUPINFO structure. */
          &pi);       /* Pointer to PROCESS_INFORMATION structure. */

    if (!ok) {
      DWORD err = GetLastError();
      int chars = snprintf(msg, sizeof(msg) - 1,
            "Tried to launch: \"%s\", but got error [%u]: ", cmdline, err);

      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|
            FORMAT_MESSAGE_MAX_WIDTH_MASK, 0L, err, 0, (LPVOID)&msg[chars],
            (300-chars), 0);
      WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg,lstrlen(msg), &err,NULL);
      return 2;
    }

    /*
     * Close our references to the write handles that have now been inherited.
     */

    CloseHandle(si.hStdOutput);
    CloseHandle(si.hStdError);

    WaitForInputIdle(pi.hProcess, 5000);
    CloseHandle(pi.hThread);

    /*
     * Start the pipe reader threads.
     */

    pipeThreads[0] = CreateThread(NULL, 0, ReadFromPipe, &Out, 0, &threadID);
    pipeThreads[1] = CreateThread(NULL, 0, ReadFromPipe, &Err, 0, &threadID);

    /*
     * Block waiting for the process to end.
     */

    WaitForSingleObject(pi.hProcess, INFINITE);
    CloseHandle(pi.hProcess);

    /*
     * Wait for our pipe to get done reading, should it be a little slow.
     */

    WaitForMultipleObjects(2, pipeThreads, TRUE, 500);
    CloseHandle(pipeThreads[0]);
    CloseHandle(pipeThreads[1]);

    /*
     * Look for the commandline warning code in both streams.
     *  - in MSVC 6 & 7 we get D4002, in MSVC 8 we get D9002.
     */

    return !(strstr(Out.buffer, "D4002") != NULL
             || strstr(Err.buffer, "D4002") != NULL
             || strstr(Out.buffer, "D9002") != NULL
             || strstr(Err.buffer, "D9002") != NULL
             || strstr(Out.buffer, "D2021") != NULL
             || strstr(Err.buffer, "D2021") != NULL);
}

int
CheckForLinkerFeature(
    const char *option)
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;
    SECURITY_ATTRIBUTES sa;
    DWORD threadID;
    char msg[300];
    BOOL ok;
    HANDLE hProcess, h, pipeThreads[2];
    char cmdline[100];

    hProcess = GetCurrentProcess();

    ZeroMemory(&pi, sizeof(PROCESS_INFORMATION));
    ZeroMemory(&si, sizeof(STARTUPINFO));
    si.cb = sizeof(STARTUPINFO);
    si.dwFlags   = STARTF_USESTDHANDLES;
    si.hStdInput = INVALID_HANDLE_VALUE;

    ZeroMemory(&sa, sizeof(SECURITY_ATTRIBUTES));
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = NULL;
    sa.bInheritHandle = TRUE;

    /*
     * Create a non-inheritible pipe.
     */

    CreatePipe(&Out.pipe, &h, &sa, 0);

    /*
     * Dupe the write side, make it inheritible, and close the original.
     */

    DuplicateHandle(hProcess, h, hProcess, &si.hStdOutput, 0, TRUE,
          DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);

    /*
     * Same as above, but for the error side.
     */

    CreatePipe(&Err.pipe, &h, &sa, 0);
    DuplicateHandle(hProcess, h, hProcess, &si.hStdError, 0, TRUE,
          DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE);

    /*
     * Base command line.
     */

    lstrcpy(cmdline, "link.exe -nologo ");

    /*
     * Append our option for testing.
     */

    lstrcat(cmdline, option);

    ok = CreateProcess(
          NULL,       /* Module name. */
          cmdline,          /* Command line. */
          NULL,       /* Process handle not inheritable. */
          NULL,       /* Thread handle not inheritable. */
          TRUE,       /* yes, inherit handles. */
          DETACHED_PROCESS, /* No console for you. */
          NULL,       /* Use parent's environment block. */
          NULL,       /* Use parent's starting directory. */
          &si,        /* Pointer to STARTUPINFO structure. */
          &pi);       /* Pointer to PROCESS_INFORMATION structure. */

    if (!ok) {
      DWORD err = GetLastError();
      int chars = snprintf(msg, sizeof(msg) - 1,
            "Tried to launch: \"%s\", but got error [%u]: ", cmdline, err);

      FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|
            FORMAT_MESSAGE_MAX_WIDTH_MASK, 0L, err, 0, (LPVOID)&msg[chars],
            (300-chars), 0);
      WriteFile(GetStdHandle(STD_ERROR_HANDLE), msg,lstrlen(msg), &err,NULL);
      return 2;
    }

    /*
     * Close our references to the write handles that have now been inherited.
     */

    CloseHandle(si.hStdOutput);
    CloseHandle(si.hStdError);

    WaitForInputIdle(pi.hProcess, 5000);
    CloseHandle(pi.hThread);

    /*
     * Start the pipe reader threads.
     */

    pipeThreads[0] = CreateThread(NULL, 0, ReadFromPipe, &Out, 0, &threadID);
    pipeThreads[1] = CreateThread(NULL, 0, ReadFromPipe, &Err, 0, &threadID);

    /*
     * Block waiting for the process to end.
     */

    WaitForSingleObject(pi.hProcess, INFINITE);
    CloseHandle(pi.hProcess);

    /*
     * Wait for our pipe to get done reading, should it be a little slow.
     */

    WaitForMultipleObjects(2, pipeThreads, TRUE, 500);
    CloseHandle(pipeThreads[0]);
    CloseHandle(pipeThreads[1]);

    /*
     * Look for the commandline warning code in the stderr stream.
     */

    return !(strstr(Out.buffer, "LNK1117") != NULL ||
          strstr(Err.buffer, "LNK1117") != NULL ||
          strstr(Out.buffer, "LNK4044") != NULL ||
          strstr(Err.buffer, "LNK4044") != NULL);
}

DWORD WINAPI
ReadFromPipe(
    LPVOID args)
{
    pipeinfo *pi = (pipeinfo *) args;
    char *lastBuf = pi->buffer;
    DWORD dwRead;
    BOOL ok;

  again:
    if (lastBuf - pi->buffer + CHUNK > STATICBUFFERSIZE) {
      CloseHandle(pi->pipe);
      return (DWORD)-1;
    }
    ok = ReadFile(pi->pipe, lastBuf, CHUNK, &dwRead, 0L);
    if (!ok || dwRead == 0) {
      CloseHandle(pi->pipe);
      return 0;
    }
    lastBuf += dwRead;
    goto again;

    return 0;  /* makes the compiler happy */
}

int
IsIn(
    const char *string,
    const char *substring)
{
    return (strstr(string, substring) != NULL);
}

/*
 * Find a specified #define by name.
 *
 * If the line is '#define TCL_VERSION "8.5"', it returns 85 as the result.
 */

int
GrepForDefine(
    const char *file,
    const char *string)
{
    char s1[51], s2[51], s3[51];
    FILE *f = fopen(file, "rt");

    if (f == NULL) {
      return 0;
    }

    do {
      int r = fscanf(f, "%50s", s1);

      if (r == 1 && !strcmp(s1, "#define")) {
          /*
           * Get next two words.
           */

          r = fscanf(f, "%50s %50s", s2, s3);
          if (r != 2) {
            continue;
          }

          /*
           * Is the first word what we're looking for?
           */

          if (!strcmp(s2, string)) {
            double d1;

            fclose(f);

            /*
             * Add 1 past first double quote char. "8.5"
             */

            d1 = atof(s3 + 1);              /*    8.5  */
            while (floor(d1) != d1) {
                d1 *= 10.0;
            }
            return ((int) d1);              /*    85   */
          }
      }
    } while (!feof(f));

    fclose(f);
    return 0;
}

/*
 * GetVersionFromFile --
 *    Looks for a match string in a file and then returns the version
 *    following the match where a version is anything acceptable to
 *    package provide or package ifneeded.
 */

const char *
GetVersionFromFile(
    const char *filename,
    const char *match)
{
    size_t cbBuffer = 100;
    static char szBuffer[100];
    char *szResult = NULL;
    FILE *fp = fopen(filename, "rt");

    if (fp != NULL) {
      /*
       * Read data until we see our match string.
       */

      while (fgets(szBuffer, cbBuffer, fp) != NULL) {
          LPSTR p, q;

          p = strstr(szBuffer, match);
          if (p != NULL) {
            /*
             * Skip to first digit.
             */

            while (*p && !isdigit(*p)) {
                ++p;
            }

            /*
             * Find ending whitespace.
             */

            q = p;
            while (*q && (isalnum(*q) || *q == '.')) {
                ++q;
            }

            memcpy(szBuffer, p, q - p);
            szBuffer[q-p] = 0;
            szResult = szBuffer;
            break;
          }
      }
      fclose(fp);
    }
    return szResult;
}

/*
 * List helpers for the SubstituteFile function
 */

typedef struct list_item_t {
    struct list_item_t *nextPtr;
    char * key;
    char * value;
} list_item_t;

/* insert a list item into the list (list may be null) */
static list_item_t *
list_insert(list_item_t **listPtrPtr, const char *key, const char *value)
{
    list_item_t *itemPtr = malloc(sizeof(list_item_t));
    if (itemPtr) {
      itemPtr->key = strdup(key);
      itemPtr->value = strdup(value);
      itemPtr->nextPtr = NULL;

      while(*listPtrPtr) {
          listPtrPtr = &(*listPtrPtr)->nextPtr;
      }
      *listPtrPtr = itemPtr;
    }
    return itemPtr;
}

static void
list_free(list_item_t **listPtrPtr)
{
    list_item_t *tmpPtr, *listPtr = *listPtrPtr;
    while (listPtr) {
      tmpPtr = listPtr;
      listPtr = listPtr->nextPtr;
      free(tmpPtr->key);
      free(tmpPtr->value);
      free(tmpPtr);
    }
}

/*
 * SubstituteFile --
 *    As windows doesn't provide anything useful like sed and it's unreliable
 *    to use the tclsh you are building against (consider x-platform builds -
 *    eg compiling AMD64 target from IX86) we provide a simple substitution
 *    option here to handle autoconf style substitutions.
 *    The substitution file is whitespace and line delimited. The file should
 *    consist of lines matching the regular expression:
 *      \s*\S+\s+\S*$
 *
 *    Usage is something like:
 *      nmakehlp -S << $** > $@
 *        @PACKAGE_NAME@ $(PACKAGE_NAME)
 *        @PACKAGE_VERSION@ $(PACKAGE_VERSION)
 *        <<
 */

int
SubstituteFile(
    const char *substitutions,
    const char *filename)
{
    size_t cbBuffer = 1024;
    static char szBuffer[1024], szCopy[1024];
    char *szResult = NULL;
    list_item_t *substPtr = NULL;
    FILE *fp, *sp;

    fp = fopen(filename, "rt");
    if (fp != NULL) {

      /*
       * Build a list of substutitions from the first filename
       */

      sp = fopen(substitutions, "rt");
      if (sp != NULL) {
          while (fgets(szBuffer, cbBuffer, sp) != NULL) {
            char *ks, *ke, *vs, *ve;
            ks = szBuffer;
            while (ks && *ks && isspace(*ks)) ++ks;
            ke = ks;
            while (ke && *ke && !isspace(*ke)) ++ke;
            vs = ke;
            while (vs && *vs && isspace(*vs)) ++vs;
            ve = vs;
            while (ve && *ve && !(*ve == '\r' || *ve == '\n')) ++ve;
            *ke = 0, *ve = 0;
            list_insert(&substPtr, ks, vs);
          }
          fclose(sp);
      }

      /* debug: dump the list */
#ifdef _DEBUG
      {
          int n = 0;
          list_item_t *p = NULL;
          for (p = substPtr; p != NULL; p = p->nextPtr, ++n) {
            fprintf(stderr, "% 3d '%s' => '%s'\n", n, p->key, p->value);
          }
      }
#endif
      
      /*
       * Run the substitutions over each line of the input
       */
      
      while (fgets(szBuffer, cbBuffer, fp) != NULL) {
          list_item_t *p = NULL;
          for (p = substPtr; p != NULL; p = p->nextPtr) {
            char *m = strstr(szBuffer, p->key);
            if (m) {
                char *cp, *op, *sp;
                cp = szCopy;
                op = szBuffer;
                while (op != m) *cp++ = *op++;
                sp = p->value;
                while (sp && *sp) *cp++ = *sp++;
                op += strlen(p->key);
                while (*op) *cp++ = *op++;
                *cp = 0;
                memcpy(szBuffer, szCopy, sizeof(szCopy));
            }
          }
          printf(szBuffer);
      }
      
      list_free(&substPtr);
    }
    fclose(fp);
    return 0;
}

/*
 * Local variables:
 *   mode: c
 *   c-basic-offset: 4
 *   fill-column: 78
 *   indent-tabs-mode: t
 *   tab-width: 8
 * End:
 */

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