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fread fixes.

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This includes changes to fread to fix two problems. The first is that fread would ignore and discard characters put back with ungetc(). The second is that it would generally return the wrong value if reading from stdin with an element size other than 1 (it would return the count of bytes, not elements).

This fixes #9 (the first problem mentioned above).
This commit is contained in:
Stephen Heumann 2022-06-27 18:24:52 -05:00
parent 1f88a38e2e
commit a2b3d4541a
1 changed files with 42 additions and 15 deletions
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57
stdio.asm
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@ -1582,23 +1582,42 @@ temp equ 1
stz rdTransferCount set the # of elements read
stz rdTransferCount+2
stz pbkCount no putback characters read yet
ph4 stream verify that stream exists
jsl ~VerifyStream
jcs lb6
ph4 stream reset file pointer
jsl ~SetFilePointer
mul4 element_size,count,rdRequestCount set the # of bytes
lda rdRequestCount quit if the request count is 0
move4 rdRequestCount,temp save full request count
pb1 lda rdRequestCount quit if the request count is 0
ora rdRequestCount+2
jeq lb6
jeq lb4
ldy #FILE_pbk if there is a putback character
lda [stream],Y
bmi lb0
short M read it in
sta [ptr]
long M
inc4 ptr adjust pointer and counts
dec4 rdRequestCount
inc pbkCount
ldy #FILE_pbk+2 pop the putback buffer
lda [stream],Y
tax
lda #$FFFF
sta [stream],Y
ldy #FILE_pbk
txa
sta [stream],Y
bra pb1 loop to check for another putback chr
lb0 ph4 stream reset file pointer
jsl ~SetFilePointer
ldy #FILE_file set the file ID number
lda [stream],Y
bpl lb2 branch if it is a file
cmp #stdinID if the file is stdin then
jne lb6
stz rdTransferCount
stz rdTransferCount+2
lda >stdin+4+FILE_flag
and #_IOEOF
jne lb6
@ -1609,7 +1628,7 @@ lb1 jsl SYSKEYIN read the bytes
ora >stdin+4+FILE_flag
sta >stdin+4+FILE_flag
jsl SYSKEYIN read the closing cr
brl lb6
bra lb4
lb1a short M set character
sta [ptr]
long M
@ -1619,27 +1638,33 @@ lb1a short M set character
lda rdRequestCount
ora rdRequestCount+2
bne lb1
bra lb6
bra lb4
lb2 sta rdRefNum set the reference number
move4 ptr,rdDataBuffer set the start address
OSRead rd read the bytes
bcc lb5
bcc lb4
cmp #$4C if the error was $4C then
bne lb3
jsr SetEOF set the EOF flag
bra lb5
bra lb4
lb3 ph4 stream I/O error
jsr ~ioerror
! set the # records read
lb5 div4 rdTransferCount,element_size
lda count if there were too few elements read then
lb4 clc rdTransferCount += pbkCount
lda rdTransferCount
adc pbkCount
sta rdTransferCount
bcc lb5
inc rdTransferCount+2
lb5 lda temp if there were too few elements read then
cmp rdTransferCount
bne lb5a
lda count+2
lda temp+2
cmp rdTransferCount+2
beq lb6
beq lb5b
lb5a jsr SetEOF set the EOF flag
! set the # records read
lb5b div4 rdTransferCount,element_size
lb6 move4 rdTransferCount,temp
plb
@ -1653,6 +1678,8 @@ rdDataBuffer ds 4
rdRequestCount ds 4
rdTransferCount ds 4
dc i'1'
pbkCount ds 2 number of characters read from putback
;
; Set the EOF flag
;