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.pa 1
.he 'GETC, GETW, FOPEN (III)'3/15/72'GETC, GETW, FOPEN (III)'
.ti 0
NAME getw, getc, fopen -- buffered input
.sp
.ti 0
SYNOPSIS mov $filename,r0
.br
jsr r5,fopen; iobuf
jsr r5,getc; iobuf
.br
(character in r0)
jsr r5,getw; iobuf
.br
(word in r0)
.sp
.ti 0
DESCRIPTION These routines are used to provide a buffered input
facility.
iobuf_____ is the address of a 518(10) byte buffer area whose
contents are maintained by these routines. Its format is:
.sp
.nf
ioptr: .=.+2 / file descriptor
.=.+2 / characters left in buffer
.=.+2 / ptr to next character
.=.+512. / the buffer
.sp
.fi
fopen_____ may be called initially to open the file. On return,
the error bit (c-bit) is set if the open failed.
If fopen_____ is never called, get___ will read from the standard
input file.
.sp
getc____ returns the next byte from the file in r0. The
error bit is set on end of file or a read error.
.sp
getw____ returns the next word in r0. getc____ and getw____
may be used alternately; there are no odd/even
problems.
.sp
iobuf_____ must be provided by the user; it must be on a word boundary.
To reuse the same buffer for another file, it is sufficient
to close the original file and call fopen_____ again.
.sp
.ti 0
FILES kept in /lib/liba.a
.sp
.ti 0
SEE ALSO open(II), read(II), putc(III)
.sp
.ti 0
DIAGNOSTICS c-bit set on EOF or error
.sp
.ti 0
BUGS --
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