infparse.c

[随书类]Dos6.0源代码

/*
 * Infparse.c - Setup.inf parsing code.
 * Clark Cyr, Mike Colee, Todd Laney
 * Copyright (C) Microsoft, 1989
 * March 15, 1989
 *
 *  Modification History:
 *
 *  3/15/89  CC  Clark wrote this code for control Panel. This is windows
 *		 code.
 *
 *  3/20/89  MC  Decided this code would work for Dos and windows portion
 *		 of setup. take out windows specifc stuff like local alloc's
 *		 and dialog stuff. Replace it with standard C run time calls.
 *
 *  3/24/89  Toddla TOTAL rewrite! nothing is the same any more.
 *
 *  6/29/89  MC fixed getprofilestring func to not strip quotes if more
 *              than one field exists.
 */

#ifdef DOSONLY
unsigned char XlateAnsi850(unsigned char c);
#endif

#include <dos.h>
#include <fcntl.h>
#include <io.h>
#include <malloc.h>
#include <string.h>
#include <stdlib.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";
extern char *pszPATH;

/* 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;

#ifdef DOSONLY
    c = XlateAnsi850(c);
#endif

    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(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) {
    	strcpy(szBuf, szSetupPath);
      catpath(szBuf, "system");
      catpath(szBuf, szInf);
      fh = FOPEN(szBuf);
    }
    /*
     * Next try destination path. for initial setup.
     */
    if (fh == -1) {
    	strcpy(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 = strlen(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 = strlen(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
		           */