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WHEREIS.BAS
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BASIC Source File
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1987-09-23
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5KB
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159 lines
DEFINT A-Z
' Declare symbolic constants used in program:
CONST EOFTYPE = 0, FILETYPE = 1, DIRTYPE = 2, ROOT = "TWH"
DECLARE SUB ScanDir (PathSpec$, Level, FileSpec$, Row)
DECLARE FUNCTION MakeFileName$ (Num)
DECLARE FUNCTION GetEntry$ (FileNum, EntryType)
CLS
INPUT "File to look for"; FileSpec$
PRINT
PRINT "Enter the directory where the search should start"
PRINT "(optional drive + directories). Press <ENTER> to begin"
PRINT "the search in the root directory of the current drive."
PRINT
INPUT "Starting directory"; PathSpec$
CLS
RightCh$ = RIGHT$(PathSpec$, 1)
IF PathSpec$ = "" OR RightCh$ = ":" OR RightCh$ <> "\" THEN
PathSpec$ = PathSpec$ + "\"
END IF
FileSpec$ = UCASE$(FileSpec$)
PathSpec$ = UCASE$(PathSpec$)
Level = 1
Row = 3
' Make the top level call (level 1) to begin the search:
ScanDir PathSpec$, Level, FileSpec$, Row
KILL ROOT + ".*" ' Delete all temporary files created
' by the program.
LOCATE Row + 1, 1: PRINT "Search complete."
END
'
' ======================= GETENTRY ==========================
' This procedure processes entry lines in a DIR listing
' saved to a file.
' ===========================================================
'
FUNCTION GetEntry$ (FileNum, EntryType) STATIC
' Loop until a valid entry or end-of-file (EOF) is read:
DO UNTIL EOF(FileNum)
LINE INPUT #FileNum, EntryLine$
IF EntryLine$ <> "" THEN
' Get first character from the line for test:
TestCh$ = LEFT$(EntryLine$, 1)
IF TestCh$ <> " " AND TestCh$ <> "." THEN EXIT DO
END IF
LOOP
' Entry or EOF found, decide which:
IF EOF(FileNum) THEN
EntryType = EOFTYPE
GetEntry$ = ""
ELSE ' Not EOF, either a file or a directory.
' Build and return the entry name:
EntryName$ = RTRIM$(LEFT$(EntryLine$, 8))
' Test for extension and add to name if there is one:
EntryExt$ = RTRIM$(MID$(EntryLine$, 10, 3))
IF EntryExt$ <> "" THEN
GetEntry$ = EntryName$ + "." + EntryExt$
ELSE
GetEntry$ = EntryName$
END IF
' Determine the entry type, and return that
' value to the point where GetEntry$ was called:
IF MID$(EntryLine$, 15, 3) = "DIR" THEN
EntryType = DIRTYPE ' Directory
ELSE
EntryType = FILETYPE ' File
END IF
END IF
END FUNCTION
'
' ===================== MAKEFILENAME$ =======================
' This procedure makes a file name from a root string
' ("TWH" - defined as a symbolic constant at the module
' level) and a number passed to it as an argument (Num).
' ===========================================================
'
FUNCTION MakeFileName$ (Num) STATIC
MakeFileName$ = ROOT + "." + LTRIM$(STR$(Num))
END FUNCTION
'
' ======================= SCANDIR ===========================
' This procedure recursively scans a directory for the
' file name entered by the user.
'
' NOTE: The SUB header doesn't use the STATIC keyword
' since this procedure needs a new set of variables
' each time it is invoked.
' ===========================================================
'
SUB ScanDir (PathSpec$, Level, FileSpec$, Row)
LOCATE 1, 1: PRINT "Now searching"; SPACE$(50);
LOCATE 1, 15: PRINT PathSpec$;
' Make a file specification for the temporary file:
TempSpec$ = MakeFileName$(Level)
' Get a directory listing of the current directory, and
' save it in the temporary file:
SHELL "DIR " + PathSpec$ + " > " + TempSpec$
' Get the next available file number:
FileNum = FREEFILE
' Open the DIR listing file and scan it:
OPEN TempSpec$ FOR INPUT AS #FileNum
' Process the file, one line at a time:
DO
' Get an entry from the DIR listing:
DirEntry$ = GetEntry$(FileNum, EntryType)
' If entry is a file:
IF EntryType = FILETYPE THEN
' If the FileSpec$ string matches, print entry and
' exit this loop:
IF DirEntry$ = FileSpec$ THEN
LOCATE Row, 1: PRINT PathSpec$; DirEntry$;
Row = Row + 1
EntryType = EOFTYPE
END IF
' If the entry is a directory, then make a recursive
' call to ScanDir with the new directory:
ELSEIF EntryType = DIRTYPE THEN
NewPath$ = PathSpec$ + DirEntry$ + "\"
ScanDir NewPath$, Level + 1, FileSpec$, Row
LOCATE 1, 1: PRINT "Now searching"; SPACE$(50);
LOCATE 1, 15: PRINT PathSpec$;
END IF
LOOP UNTIL EntryType = EOFTYPE
' Scan on this DIR listing file is finished, so close it:
CLOSE FileNum
END SUB