190 lines
3.7 KiB
Plaintext
190 lines
3.7 KiB
Plaintext
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export sub openfile(filename$, recordlength, numberoffields)
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// specify the record(block) length and number of fields for the file
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// returns the filehandle number used for other subs
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static numfiles
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x=open(filename$, "a")
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if x=0 return 0 // error opening the file
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close x
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numfiles=numfiles+1
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dim f$(numfiles,50,2) // f$(numfile,1-50=fieldname$
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dim f(numfiles,52)
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f$(numfiles,0,0)=filename$
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f(numfiles,51)=recordlength
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f(numfiles,52)=numberoffields
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return numfiles
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end sub
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export sub Field( filehandle,fieldnumber, fieldname$, fieldlength)
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//specify the field name and length for the field numbered fieldnumber
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if fieldnumber <= f(filehandle,52) then
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f$(filehandle,fieldnumber,0)=fieldname$
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f(filehandle,fieldnumber)=fieldlength
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f$(filehandle,fieldnumber,1)=blank$(f(filehandle,fieldnumber))
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return 1
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endif
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return 0
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end sub
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export sub lset(filehandle,fieldname$,data$)
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//sets data$ on the left end of the field, truncates the string if it is longer than the fieldlength
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//use this to prepare the record for writing
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l=len(data$)
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x=0
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for x=1 to 50
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b$=f$(filehandle,x,0)
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if (b$ = fieldname$) then
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lf=f(filehandle,x)
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dt$=data$
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if( l > lf )dt$=left$(dt$,lf)
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a$=blank$(lf-l)
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if l<lf dt$=dt$+a$
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f$(filehandle,x,1) = dt$
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end if
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next
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end sub
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export sub rset(filehandle,fieldname$,data$)
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//sets data$ on the right end of the field, truncates the string if it is longer than the fieldlength
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//use this to prepare the record for writing
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l=len(data$)
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x=0
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for x=1 to 50
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b$=f$(filehandle,x,0)
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if (b$ = fieldname$) then
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lf=f(filehandle,x)
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dt$=data$
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if( l > lf )dt$=left$(dt$,lf)
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a$=blank$(lf-l)
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if l<lf dt$=a$+dt$
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f$(filehandle,x,1) = dt$
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end if
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next
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end sub
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export sub readfield$(File, fieldname$)
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//returns the data held in fieldname$
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local x
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for x=1 to 50
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if f$(File,x,0)=fieldname$ then
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return f$(File,x,1)
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end if
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next
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end sub
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export sub write_block(recordnumber, filehandle)
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// Writes all the fields to the file at this record location
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// Uses seek recordnumber*recordlength before the write
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// Clears the field data
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// Recordnumbers start at 0. ie the first record is 0, the second is 1 etc.
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filename$=f$(filehandle,0,0)
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x=open(filename$, "r+")
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if x=0 print "error":return 0 // error opening the file
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if recordnumber = -1 then
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seek x, 0, "end" // append data to the file
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else
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seek x, ((f(filehandle,51) +1) * (recordnumber))
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endif
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printstring$=""
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for y=1 to f(filehandle,52)
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printstring$=printstring$+f$(filehandle,y,1)
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next
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l=len(printstring$)
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for y=1 to l
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a$=left$(printstring$,1)
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printstring$=right$(printstring$,len(printstring$)-1)
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poke x, a$
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next
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poke x ,"\n"
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for y=1 to f(filehandle,52)
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f$(filehandle,y,1)=blank$(f(filehandle,y))
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next
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close x
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end sub
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export sub read_block(recordnumber, filehandle)
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// Reads the data at this record, or the next record if recordnumber is -1
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// Ffills the fields with the data
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// Recordnumbers start at 0. ie the first record is 0, the second is 1 etc.
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static rec
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File=open(filename$, "rb")
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if File=0 print "error":return -1 // error opening the file
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if (recordnumber <> -1) then
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rec = recordnumber
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seek File, ((f(filehandle,51) +1) * (rec))
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endif
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a$=""
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for z=1 to f(filehandle,51)
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y=peek(File)
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a$=a$+chr$(y)
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next
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for y=0 to f(filehandle,52)
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f$(filehandle,y,1)= left$(a$,f(filehandle,y))
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a$=right$(a$,len(a$)-f(filehandle,y))
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next
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rec=rec+1
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return rec
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end sub
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export sub lof(filehandle) // alias for numberofrecords()
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local x
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filename$=f$(filehandle,0,0)
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x=open(filename$)
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seek #x, 0, "end"
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ret=tell(#x)
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if ret=0 return ret
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ret= ret/(f(filehandle,51)+1)
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ret=int(ret)
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return ret
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end sub
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export sub numberofrecords(filehandle) // alias for lof()
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fh=filehandle
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rtn=lof(fh)
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return rtn
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end sub
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sub blank$(num)
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local s$
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local x
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s$=""
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for x=1 to num
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s$=s$+" "
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next
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return s$
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end sub
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