NAME

putc, putw, fcreat, fflush  −  buffered output

SYNOPSIS

mov$filename,r0
jsrr5,fcreat; iobuf
fcreat(file, iobuf)
char *file;
struct buf *iobuf;
(get byte in r0)
jsrr5,putc; iobuf
putc(c, iobuf)
int c;
struct buf *iobuf;
(get word in r0)
jsrr5,putw; iobuf
putw(w, iobuf);
int w;
struct buf *iobuf;
jsrr5,flush; iobuf
fflush(iobuf)
struct buf *iobuf;

DESCRIPTION

Fcreat creates the given file (mode 666) and sets up the buffer iobuf (size 518 bytes); putc and putw write a byte or word respectively onto the file; flush forces the contents of the buffer to be written, but does not close the file.  The structure of the buffer is:

struct buf {
int fildes;/* File descriptor */
int nunused;/* Remaining slots */
char *xfree;/* Ptr to next free slot */
char buff[512];/* The buffer */
};

Before terminating, a program should call flush to force out the last of the output (fflush from C).  The user must supply iobuf, which should begin on a word boundary.  To write a new file using the same buffer, it suffices to call [f]flush, close the file, and call fcreat again. 

SEE ALSO

creat (II), write (II), getc (III)

DIAGNOSTICS

Fcreat sets the error bit (c-bit) if the file creation failed (from C, returns −1).  Putc and putw return their character (word) argument.  In all calls errno is set appropriately to 0 or to a system error number.  See introduction (II). 

BUGS