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Frostbyte's 1980s DOS Shareware Collection
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USCX
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DOSUT-03.ZIP
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FCBEXM.BAS
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BASIC Source File
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1983-07-20
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2KB
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43 lines
100 DEF SEG=&H1F94 'Dependent upon your memory
110 ' This sample program serves as both an example and the documentation
120 ' for the FCBREAD.BSV routine that will read the directory of a
130 ' disk and present the matching file name back to the BASIC program.
140 ' Also available to the program is the directory information that
150 ' contains the size and time/date information. This routine is
160 ' faster than OPENing the file since it does not incur that overhead.
170 ' Also the user can present an arbitrary string to match on.
180 '
190 ' To use, BLOAD the routine into any available free memory. It
200 ' has 2 entry points (INIT and GETNEXT). INIT (offset 2) is used
210 ' to define the disk drive (0=default, 1=A, 2=B, ....) and the
220 ' pattern to be used to match on. The pattern MUST BE a string of
230 ' length 11; the first 8 are the filename and the last 3 are the
240 ' extension. A "?" is used to match any character. For example to
250 ' get all the BASIC files on the disk, "????????BAS" would be used
260 ' as the input parameter. After INIT has been called, calls to
270 ' GETNEXT (offset 5) are made to retrieve matching file names.
280 ' The two parameters are the string in which the match is returned
290 ' (which must be of length 14) and an INTEGER (..%) return value.
300 ' If the status return is <0, no more matched have been found. If
310 ' status >=0, it is the FILE ATTRIBUTE (as defined in the DOS Disk
320 ' Directory).
330 '
340 ' The INTEGER value at offsets 0,1 in the routine are the offset
350 ' to the directory entry for the file. For example, to obtain the
360 ' DATE information of the file, use the following statements:
370 ' B% = PEEK(0)+PEEK(1)*256 ' Get offset value
380 ' FDATE = PEEK(B%+26)*256 + PEEK(B%+25)
390 '
400 ' The offsets into the directory entry (25, 26 in this case) are
410 ' defined in the DOS manual.
420 '
430 ' The example program will print all the file names on the current
440 ' Directory plus their attributes.
450 BLOAD "fcbread.bsv",0
460 INIT%=2:GETNEXT%=5
470 FILENAME$="???????????"
480 DISK%=0:CALL INIT%(DISK%,FILENAME$)
490 FILENAME$=SPACE$(14):CALL GETNEXT%(FILENAME$,STATUS%)
500 PRINT FILENAME$,STATUS%
510 IF STATUS%>=0 THEN GOTO 490