ProfitPress Mega CDROM2 …eeware (MSDOS)(1992)(Eng)/ProfitPress-MegaCDROM2.B6I/WINDOWS/PROGRAM/WINSTALL.ZIP/INFPARSE.C

C/C++ Source or Header | 1991-06-12 | 14.1 KB | 693 lines

/*
 * Infparse.c - Setup.inf parsing code.
 */

#include <stdlib.h>

#include "lobotomy.h"
#include <windows.h>

#include "sulib.h"

#ifdef FAR_HEAP
/*** hack.  to avoid realloc problems we make READ_BUFSIZE
            as big as the inf file, thus avoiding any reallocs */

#define READ_BUFSIZE    27000    /* size of inf buffer */
#endif
#define TMP_BUFSIZE    1024    /* size of temp reads */

#define ISSEP(c)   ((c) == '='  || (c) == ',')
#define ISWHITE(c) ((c) == ' '  || (c) == '\t' || (c) == '\n' || (c) == '\r')
#define ISNOISE(c) ((c) == '"')
#define EOF     26

#define QUOTE   '"'
#define COMMA   ','
#define SPACE   ' '
#define EQUAL   '='

PINF   pinfDefault = NULL;

static PSTR    pBuf;
static PINF    pInf;
static WORD    iBuf;
static WORD    iInf;

/* Globaly used pointers to non-translatable text strings. */

char        *pszINFFILE    =   "setup.inf";
char        *pszPATH       =   "PATH";

/* Local prototypes */

BOOL multifields(PINF);


static char GETC(int fh)
{
    register WORD n;

    if (!pBuf)
        return EOF;

    n = iBuf % TMP_BUFSIZE;

    if (n == 0)
    {
       FREAD(fh,pBuf,TMP_BUFSIZE);
    }
    iBuf++;
    return pBuf[n];
}

#ifdef FAR_HEAP

static void PUTC(char c)
{
    if (!pInf)
        return;

    pInf[iInf++] = c;
}

#else

static void PUTC(char c)
{
    register WORD    n;
    register PINF    pInfT;

    if (!pInf)
        return;

    n = iInf % READ_BUFSIZE;
    if (n == 0)
    {
        n = (iInf / READ_BUFSIZE) + 1;
        pInfT = REALLOC(pInf,n * READ_BUFSIZE);

        if (pInfT)
        {
            pInf = pInfT;
        }
        else
        {
            AssertF(FALSE);
            FREE(pInf);
            pInf = NULL;
        }
    }
    if (pInf)
        pInf[iInf++] = c;
}
#endif

/* int infLoadFile()      Load a entire INF file into memory
 *              comments are removed, each line is terminated
 *              by a \0 each section is terminated by a \0\0
 *              ONLY spaces inside of " " are preserved
 *              the end of file is marked with a ^Z
 *
 *   RETURNS:  A pointer to a block of memory containg file, NULL if failure
 *
 */
PINF infLoadFile(int fh)
{
    WORD    len;
    PINF    pInfT;
    register char    c;
    register BOOL    fQuote = FALSE;

    if (fh == -1)
      return NULL;

    len = (WORD)FSEEK(fh,0L,SEEK_END);

    FSEEK(fh,0L,SEEK_SET);

    pBuf = ALLOC(TMP_BUFSIZE);        // temp buffer
#ifdef FAR_HEAP
    pInf = FALLOC(len);            // destination, at least as big as file
#else
    pInf = ALLOC(READ_BUFSIZE);
#endif
    iBuf = 0;
    iInf = 0;

    AssertF(pBuf && pInf);
    if (!pBuf || !pInf)
    return NULL;


    while (iBuf < len)
    {
    c = GETC(fh);
loop:
        if (iBuf >= len)
            break;

    switch (c)
    {
        case '\r':        /* ignore '\r' */
        break;

        case '\n':
        for (; ISWHITE(c); c = GETC(fh))
            ;
        if (c != ';')
            PUTC(0);    /* all lines end in a \0 */

        if (c == '[')
            PUTC(0);    /* all sections end with \0\0 */

        fQuote = FALSE;
        goto loop;
        break;

        case '\t':
        case ' ':
        if (fQuote)
            PUTC(c);
        break;

        case '"':
        fQuote = !fQuote;
        PUTC(c);
        break;

        case ';':
        for (; !ISEOL(c); c = GETC(fh))
            ;
        goto loop;
        break;

        default:
        PUTC(c);
        break;
    }
    }

    PUTC(0);
    PUTC(0);
    PUTC(EOF);
    FREE((HANDLE)pBuf);

    // try to shrink this block

#ifdef FAR_HEAP

    // just leave pInf it's original size.  don't bother shrinking it

#else
    pInfT = REALLOC(pInf,iInf);

    if (pInfT)        // if REALLOC fails just leave pInf as is
        pInf = pInfT;
#endif

    AssertF(pInf);
    return pInf;
}

static int near pascal
strncmpi(LPSTR pch1, LPSTR pch2, int n)
{
    while (*pch1 && --n > 0 && UP_CASE(*pch1) == UP_CASE(*pch2))
         *pch1++,*pch2++;
    return UP_CASE(*pch1) != UP_CASE(*pch2);
}

/* PINF infOpen()    takes the string held in szBasePath as the path
 *                   to find SETUP.INF and attempts to open it. Returns
 *                   a valid file handle is successful.
 *
 *   RETURNS:  A file pointer if successful, Null pointer in the case of
 *           a failure.
 *
 *   ENTER:
 *   EXIT:   To caller
 */
PINF FAR PASCAL infOpen(PSTR szInf)
{
    char    szBuf[MAXPATHLEN];
    short   fh;
    PINF    pinf;

    fh = -1;

    if (szInf == NULL)
        szInf = pszINFFILE;

    /*
     * Next try to open passed parameter as is. For Dos half.
     */
    if (fh == -1)
    {
        fh = FOPEN(szInf);
    }
    /*
     * Next try destination path\system. for win half.
     */
    if (fh == -1) {
      lstrcpy(szBuf, szSetupPath);
      catpath(szBuf, "system");
      catpath(szBuf, szInf);
      fh = FOPEN(szBuf);
    }
    /*
     * Next try destination path. for initial setup.
     */
    if (fh == -1) {
      lstrcpy(szBuf, szSetupPath);
      catpath(szBuf, szInf);
      fh = FOPEN(szBuf);
    }
    /*
     * May need to look on the path to find the .inf file.
     */
    if ( fh == -1 ) {
      _searchenv(szInf,pszPATH,szBuf);
      if ( *szBuf )
         fh = FOPEN(szBuf);
    }

    if (fh != -1)
    {
        pinf = infLoadFile(fh);
        FCLOSE(fh);

        if (pinf && !pinfDefault)
            pinfDefault = pinf;

        return pinf;
    }
    return NULL;
}

/* void CloseSetupInf()
 *
 *   ENTER:
 *   EXIT:   To caller
 */
void FAR PASCAL infClose(PINF pinf)
{
    if (pinf == NULL)
        pinf = pinfDefault;

    if (pinf != NULL)
    {
    FFREE(pinf);

    if (pinf == pinfDefault)
        pinfDefault = NULL;
    }
}


/* FindSection    locates a section in Setup.Inf.  Sections are
 *               assumed to be delimited by a '[' as the first
 *               character on a line.
 *
 * Arguments:    pInf     Pointer to SETUP.INF buffer
 *        pszSect  PSTR to section name
 *
 * Return:    WORD file position of the first line in the section
 *               0 if section not found
 */

WORD FindSection(PINF pInf, PSTR pszSect)
{
    BOOL    fFound = FALSE;
    short    nLen = lstrlen(pszSect);
    PINF    pch;
    char        ch;

    if (!pInf)
        return 0;

    pch = pInf;
    while (!fFound && *pch != EOF)
    {
    if (*pch++ == '[')
    {
        fFound = !strncmpi(pszSect, pch, nLen) && pch[nLen] == ']';
    }

    /*
     * go to the next line, dont forget to skip over \0 and \0\0
     */
    while (*pch != EOF && *pch != '\0')
        pch++;

    while (*pch == 0)
        pch++;
    }
    return((fFound && *pch != '[' && *pch != EOF) ? pch - pInf : 0);
}

/* char* fnGetDataString(npszData,szDataStr)
 *
 * Called by functions that read sections of information from setup.inf
 * to obtain strings that are set equal to keywords. Example:
 *
 * welcome=("Hello There")
 *
 * This function will return a pointer to the null terminated string
 * "Hello There".
 *
 * ENTRY:
 *
 * npszData    : pointer to entire section taken from setup.inf
 * npszDataStr : pointer to key word to look for (welcome in example above.)
 *
 * EXIT: retutns pointer to string if successful, NULL if failure.
 *
 */
BOOL fnGetDataString(PINF npszData, PSTR szDataStr, LPSTR szBuf)
{
    unsigned char  *clocation;
    unsigned char  *pStringHead;
    int len = lstrlen(szDataStr);

    while (npszData)
    {
        if (!strncmpi(npszData,szDataStr,len))  // looking for correct prof.
        {
           npszData += len;            // found !, look past prof str.
           while (ISWHITE(*npszData))  // suck out the crap.
               npszData++;
          if (*npszData == EQUAL)     // Now we have what were looking for !
           {
               npszData++;

             if (!multifields(npszData) )
             {
                while (ISWHITE(*npszData) || ISNOISE(*npszData))
                     npszData++;

                  while (*npszData)
                     *szBuf++ = *npszData++;

                  /*
                   * remove trailing spaces, and those pesky ()'s
                   */

                while (ISWHITE(szBuf[-1]) || ISNOISE(szBuf[-1]))
                     szBuf--;

                  *szBuf = 0;
                  return TRUE;
             }
             else
             {
                while (*npszData)
                   *szBuf++ = *npszData++;
                *szBuf = '\0';
                return TRUE;
             }
           }
       }
       npszData = infNextLine(npszData);
    }
    *szBuf = 0;
    return FALSE;
}

/*  PINF infSetDefault(pinf)
 *
 *  Sets the default INF file
 *
 * ENTRY:
 *      pinf            : inf file to be new default
 *
 * EXIT: retutns old default
 *
 */
PINF FAR PASCAL infSetDefault(PINF pinf)
{
    PINF pinfT;

    pinfT = pinfDefault;
    pinfDefault = pinf;
    return pinfT;
}

/*  PINF infFindSection(pinf,szSection)
 *
 *  Reads a entire section into memory and returns a pointer to it
 *
 * ENTRY:
 *      pinf            : inf file to search for section
 *    szSection    : section name to read
 *
 * EXIT: retutns pointer to section, NULL if error
 *
 */
PINF FAR PASCAL infFindSection(PINF pinf, PSTR szSection)
{
    WORD   pos;

    if (pinf == NULL)
        pinf = pinfDefault;

    pos = FindSection(pinf, szSection);
    return pos ? pinf + pos : NULL;
}

/*  BOOL infGetProfileString(szSection,szItem,szBuf)
 *
 *  Reads a single string from a section in SETUP.INF
 *
 *  [section]
 *    item = string
 *
 * ENTRY:
 *    szSection    : pointer to section name to read.
 *    szItem        : pointer to item name to read
 *    szBuf        : pointer to a buffer to hold result
 *
 * EXIT: retutns TRUE if successful, FALSE if failure.
 *
 */
BOOL FAR PASCAL infGetProfileString(PINF pinf, PSTR szSection,PSTR szItem,LPSTR szBuf)
{
    PINF    pSection;

    if (pSection = infFindSection(pinf,szSection))
        return fnGetDataString(pSection,szItem,szBuf);
    else
        *szBuf = 0;
    return FALSE;
}

/* BOOL infParseField(szData,n,szBuf)
 *
 * Given a line from SETUP.INF, will extract the nth field from the string
 * fields are assumed separated by comma's.  Leading and trailing spaces
 * are removed.
 *
 * ENTRY:
 *
 * szData    : pointer to line from SETUP.INF
 * n         : field to extract. ( 1 based )
 *             0 is field before a '=' sign
 * szDataStr : pointer to buffer to hold extracted field
 *
 * EXIT: retutns TRUE if successful, FALSE if failure.
 *
 */
BOOL FAR PASCAL infParseField(PINF szData, int n, LPSTR szBuf)
{
    BOOL    fQuote = FALSE;
    PINF    pch;
    LPSTR   ptr;

    if (!szData || !szBuf)
        return FALSE;

    /*
     * find the first separator
     */
    for (pch=szData; *pch && !ISSEP(*pch); pch++) {
      if ( *pch == QUOTE )
         fQuote = !fQuote;
    }

    if (n == 0 && *pch != '=')
        return FALSE;

    if (n > 0 && *pch == '=' && !fQuote)
        szData = ++pch;

    /*
     *    locate the nth comma, that is not inside of quotes
     */
    fQuote = FALSE;
    while (n > 1)
    {
        while (*szData)
        {
          if (!fQuote && ISSEP(*szData))
               break;

          if (*szData == QUOTE)
               fQuote = !fQuote;

           szData++;
        }

        if (!*szData) {
           szBuf[0] = 0;        // make szBuf empty
           return FALSE;
        }

        szData++;
        n--;
    }
    /*
     * now copy the field to szBuf
     */
    while (ISWHITE(*szData))
        szData++;

    fQuote = FALSE;
    ptr = szBuf;        // fill output buffer with this
    while (*szData)
    {
       if (*szData == QUOTE)
           fQuote = !fQuote;
       else if (!fQuote && ISSEP(*szData))
           break;
        else
           *ptr++ = *szData;
        szData++;
    }
    /*
     * remove trailing spaces, and those pesky ()'s
     */
    while ((ptr > szBuf) && (ISWHITE(ptr[-1]) || ISNOISE(ptr[-1])))
        ptr--;

    *ptr = 0;
    return TRUE;
}

/* BOOL multifields(PSTR npszData);
 *
 * Given a line line from setup.inf that was phycisacaly after a profile
 * string this function will determine if that line has more than one
 * field. ie. Fields are seperated by commas that are NOT contained between
 * quotes.
 *
 * ENYRY:
 *
 * npszData : a line from setup.inf Example "xyz adapter",1:foobar.drv
 *
 * EXIT: This function will return TRUE if the line containes more than
 *       one field, ie the function would return TRUE for the example line
 *       shown above.
 *
 */
BOOL multifields(PINF npszData)
{
   BOOL    fQuote = FALSE;

    while (*npszData)
    {
      if (!fQuote && ISSEP(*npszData))
           return TRUE;

      if (*npszData == QUOTE)
           fQuote = !fQuote;

       npszData++;
    }
   return FALSE;
}

/* PSTR infNextLine(sz)
 *
 * Given a line from SETUP.INF, advance to the next line.  will skip past the
 * ending NULL character checking for end of buffer \0\0
 *
 * ENTRY:
 *
 * sz         : pointer to line from a SETUP.INF section
 *
 * EXIT: retutns pointer to next line if successful, NULL if failure.
 *
 */
PINF FAR PASCAL infNextLine(PINF pinf)
{
    if (!pinf)
        return NULL;

    while (*pinf != 0 || *(pinf + 1) == ' ')
        pinf++;

    return *++pinf ? pinf : NULL;
}

/* int infLineCount(pinf)
 *
 * Given a section from SETUP.INF, returns the number of lines in the section
 *
 * ENTRY:
 *
 * pinf         : pointer to a section from SETUP.INF
 *
 * EXIT: retutns line count
 *
 */
int FAR PASCAL infLineCount(PINF pinf)
{
    int n = 0;

    for (n=0; pinf; pinf = infNextLine(pinf))
    n++;

    return n;
}

/* int infLookup(szInf,szBuf)
 *
 * lookup a section/key in SETUP.INF
 *
 * ENTRY:
 *
 * szInf        : pointer to a string of the form section.key
 * szBuf        : pointer to buffer to recive string
 *
 * EXIT: retutns TRUE/FALSE
 *
 */
BOOL FAR PASCAL infLookup(PSTR szInf, LPSTR szBuf)
{
    PSTR pch;
    BOOL f;

    /*
     * find the LAST .
     */
    for (pch = szInf; *pch; pch++)
    ;

    for (; pch > szInf && *pch != '.'; pch--)
    ;

    if (*pch == '.')
    {
    *pch++ = 0;
        f = infGetProfileString(NULL,szInf,pch,szBuf);
        if (szInf != szBuf)
            *pch = '.';
        return f;
    }
    else
    {
        *szBuf = 0;
        return FALSE;
    }
}