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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#define import_spp
#define import_libc
#define import_stdio
#include <iraf.h>
/* FREAD -- Read a binary block of data from the input file. To be consistent
** with UNIX we must read until nelem chars have been accumulated or until
** EOF is seen. Hence, if reading from a record structured device such as a
** terminal, the read will not be terminated by end of record (newline).
** If the number of bytes (C chars) requested does not fill an integral number
** of XCHARS additional bytes will be read to fill out the last XCHAR.
*/
int
fread (
char *bp, /* output buffer */
int szelem, /* nbytes per element */
int nelem, /* nelems to read */
FILE *fp
)
{
register int nread, n;
int nbytes;
XINT fd = fileno (fp);
char *op = bp;
fd = fileno (fp);
nbytes = nelem * szelem;
nread = 0;
if (fp == stdin)
(void) fflush (stdout);
if (szelem <= 0)
return (0);
for (op = bp; nread < nbytes; op += n) {
iferr (n = c_read (fd, op, nbytes-nread)) {
fp->_fflags |= _FERR;
break;
} else if (n == EOF) {
fp->_fflags |= _FEOF;
break;
} else
nread += n;
}
if (fp->_fflags & (_FEOF|_FERR))
return (nread ? nread / szelem : 0);
else
return (nread / szelem);
}
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