params.c

来自「samba-3.0.22.tar.gz 编译smb服务器的源码」· C语言 代码 · 共 605 行 · 第 1/2 页

			bufr[end] = '\0';
			if( 0 == end ) {
				/* Don't allow an empty name.       */
				DEBUG(0, ("%s Empty section name in configuration file.\n", func ));
				return False;
			}
			if( !sfunc(bufr) )            /* Got a valid name.  Deal with it. */
				return False;
			EatComment( InFile );     /* Finish off the line.             */
			return True;
		}

	}

	/* We arrive here if we've met the EOF before the closing bracket. */
	DEBUG(0, ("%s Unexpected EOF in the configuration file: %s\n", func, bufr ));
	return False;
}

/* ------------------------------------------------------------------------ **
 * Scan a parameter name and value, and pass these two fields to pfunc().
 *
 *  Input:  InFile  - The input source.
 *          pfunc   - A pointer to the function that will be called to
 *                    process the parameter, once it has been scanned.
 *          c       - The first character of the parameter name, which
 *                    would have been read by Parse().  Unlike a comment
 *                    line or a section header, there is no lead-in
 *                    character that can be discarded.
 *
 *  Output: True if the parameter name and value were scanned and processed
 *          successfully, else False.
 *
 *  Notes:  This function is in two parts.  The first loop scans the
 *          parameter name.  Internal whitespace is compressed, and an
 *          equal sign (=) terminates the token.  Leading and trailing
 *          whitespace is discarded.  The second loop scans the parameter
 *          value.  When both have been successfully identified, they are
 *          passed to pfunc() for processing.
 *
 * ------------------------------------------------------------------------ **
 */

static BOOL Parameter( myFILE *InFile, BOOL (*pfunc)(const char *, const char *), int c )
{
	int   i       = 0;    /* Position within bufr. */
	int   end     = 0;    /* bufr[end] is current end-of-string. */
	int   vstart  = 0;    /* Starting position of the parameter value. */
	const char *func    = "params.c:Parameter() -";

	/* Read the parameter name. */
	while( 0 == vstart ) {
		/* Loop until we've found the start of the value. */
		if( i > (bSize - 2) ) {
			/* Ensure there's space for next char.    */
			char *tb = (char *)SMB_REALLOC( bufr, bSize + BUFR_INC );
			if( NULL == tb ) {
				DEBUG(0, ("%s Memory re-allocation failure.", func) );
				return False;
			}
			bufr = tb;
			bSize += BUFR_INC;
		}

		switch(c) {
			case '=': /* Equal sign marks end of param name. */
				if( 0 == end ) {
					/* Don't allow an empty name.      */
					DEBUG(0, ("%s Invalid parameter name in config. file.\n", func ));
					return False;
				}
				bufr[end++] = '\0';         /* Mark end of string & advance.   */
				i       = end;              /* New string starts here.         */
				vstart  = end;              /* New string is parameter value.  */
				bufr[i] = '\0';             /* New string is nul, for now.     */
				break;

			case '\n': /* Find continuation char, else error. */
				i = Continuation( bufr, i );
				if( i < 0 ) {
					bufr[end] = '\0';
					DEBUG(1,("%s Ignoring badly formed line in configuration file: %s\n", func, bufr ));
					return True;
				}
				end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i);
				c = mygetc( InFile );       /* Read past eoln.                   */
				break;

			case '\0': /* Shouldn't have EOF within param name. */
			case EOF:
				bufr[i] = '\0';
				DEBUG(1,("%s Unexpected end-of-file at: %s\n", func, bufr ));
				return True;

			default:
				if(isspace( c )) {
					/* One ' ' per whitespace region.       */
					bufr[end] = ' ';
					i = end + 1;
					c = EatWhitespace( InFile );
				} else {
					bufr[i++] = c;
					end = i;
					c = mygetc( InFile );
				}
		}
	}

	/* Now parse the value. */
	c = EatWhitespace( InFile );  /* Again, trim leading whitespace. */
	while( (EOF !=c) && (c > 0) ) {
		if( i > (bSize - 2) ) {
			/* Make sure there's enough room. */
			char *tb = (char *)SMB_REALLOC( bufr, bSize + BUFR_INC );
			if( NULL == tb ) {
				DEBUG(0, ("%s Memory re-allocation failure.", func));
				return False;
			}
			bufr = tb;
			bSize += BUFR_INC;
		}

		switch(c) {
			case '\r': /* Explicitly remove '\r' because the older */
				c = mygetc( InFile );   /* version called fgets_slash() which also  */
				break;                /* removes them.                            */

			case '\n': /* Marks end of value unless there's a '\'. */
				i = Continuation( bufr, i );
				if( i < 0 ) {
					c = 0;
				} else {
					for( end = i; (end >= 0) && isspace((int)bufr[end]); end-- )
						;
					c = mygetc( InFile );
				}
				break;

			default: /* All others verbatim.  Note that spaces do not advance <end>.  This allows trimming  */
				bufr[i++] = c;
				if( !isspace( c ) )  /* of whitespace at the end of the line.     */
					end = i;
				c = mygetc( InFile );
				break;
		}
	}
	bufr[end] = '\0';          /* End of value. */

	return( pfunc( bufr, &bufr[vstart] ) );   /* Pass name & value to pfunc().  */
}

/* ------------------------------------------------------------------------ **
 * Scan & parse the input.
 *
 *  Input:  InFile  - Input source.
 *          sfunc   - Function to be called when a section name is scanned.
 *                    See Section().
 *          pfunc   - Function to be called when a parameter is scanned.
 *                    See Parameter().
 *
 *  Output: True if the file was successfully scanned, else False.
 *
 *  Notes:  The input can be viewed in terms of 'lines'.  There are four
 *          types of lines:
 *            Blank      - May contain whitespace, otherwise empty.
 *            Comment    - First non-whitespace character is a ';' or '#'.
 *                         The remainder of the line is ignored.
 *            Section    - First non-whitespace character is a '['.
 *            Parameter  - The default case.
 * 
 * ------------------------------------------------------------------------ **
 */

static BOOL Parse( myFILE *InFile,
                   BOOL (*sfunc)(const char *),
                   BOOL (*pfunc)(const char *, const char *) )
{
	int    c;

	c = EatWhitespace( InFile );
	while( (EOF != c) && (c > 0) ) {
		switch( c ) {
			case '\n': /* Blank line. */
				c = EatWhitespace( InFile );
				break;

			case ';': /* Comment line. */
			case '#':
				c = EatComment( InFile );
				break;

			case '[': /* Section Header. */
				if( !Section( InFile, sfunc ) )
					return False;
				c = EatWhitespace( InFile );
				break;

			case '\\': /* Bogus backslash. */
				c = EatWhitespace( InFile );
				break;

			default: /* Parameter line. */
				if( !Parameter( InFile, pfunc, c ) )
					return False;
				c = EatWhitespace( InFile );
				break;
		}
	}
	return True;
}

/* ------------------------------------------------------------------------ **
 * Open a configuration file.
 *
 *  Input:  FileName  - The pathname of the config file to be opened.
 *
 *  Output: A pointer of type (char **) to the lines of the file
 *
 * ------------------------------------------------------------------------ **
 */

static myFILE *OpenConfFile( const char *FileName )
{
	const char *func = "params.c:OpenConfFile() -";
	int lvl = in_client?1:0;
	myFILE *ret;

	ret = SMB_MALLOC_P(myFILE);
	if (!ret)
		return NULL;

	ret->buf = file_load(FileName, &ret->size);
	if( NULL == ret->buf ) {
		DEBUG( lvl, ("%s Unable to open configuration file \"%s\":\n\t%s\n",
			func, FileName, strerror(errno)) );
		SAFE_FREE(ret);
		return NULL;
	}

	ret->p = ret->buf;
	ret->end_section_p = NULL;
	return( ret );
}

/* ------------------------------------------------------------------------ **
 * Process the named parameter file.
 *
 *  Input:  FileName  - The pathname of the parameter file to be opened.
 *          sfunc     - A pointer to a function that will be called when
 *                      a section name is discovered.
 *          pfunc     - A pointer to a function that will be called when
 *                      a parameter name and value are discovered.
 *
 *  Output: TRUE if the file was successfully parsed, else FALSE.
 *
 * ------------------------------------------------------------------------ **
 */

BOOL pm_process( const char *FileName,
		BOOL (*sfunc)(const char *),
		BOOL (*pfunc)(const char *, const char *) )
{
	int   result;
	myFILE *InFile;
	const char *func = "params.c:pm_process() -";

	InFile = OpenConfFile( FileName );          /* Open the config file. */
	if( NULL == InFile )
		return False;

	DEBUG( 3, ("%s Processing configuration file \"%s\"\n", func, FileName) );

	if( NULL != bufr ) {
		/* If we already have a buffer */
		/* (recursive call), then just */
		/* use it.                     */
		result = Parse( InFile, sfunc, pfunc );
	} else {
		bSize = BUFR_INC;
		bufr = (char *)SMB_MALLOC( bSize );
		if( NULL == bufr ) {
			DEBUG(0,("%s memory allocation failure.\n", func));
			myfile_close(InFile);
			return False;
		}

		result = Parse( InFile, sfunc, pfunc );
		SAFE_FREE( bufr );
		bufr  = NULL;
		bSize = 0;
	}

	myfile_close(InFile);

	if( !result ) {
		DEBUG(0,("%s Failed.  Error returned from params.c:parse().\n", func));
		return False;
	}

	return True;
}