| 1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | */ |
| 6 | |
| 7 | #if defined(LIBC_SCCS) && !defined(lint) |
| 8 | static char sccsid[] = "@(#)fread.c 5.2 (Berkeley) %G%"; |
| 9 | #endif LIBC_SCCS and not lint |
| 10 | |
| 11 | #include <stdio.h> |
| 12 | |
| 13 | fread(ptr, size, count, iop) |
| 14 | register char *ptr; |
| 15 | unsigned size, count; |
| 16 | register FILE *iop; |
| 17 | { |
| 18 | register int s; |
| 19 | int c; |
| 20 | |
| 21 | s = size * count; |
| 22 | while (s > 0) { |
| 23 | if (iop->_cnt < s) { |
| 24 | if (iop->_cnt > 0) { |
| 25 | bcopy(iop->_ptr, ptr, iop->_cnt); |
| 26 | ptr += iop->_cnt; |
| 27 | s -= iop->_cnt; |
| 28 | } |
| 29 | /* |
| 30 | * filbuf clobbers _cnt & _ptr, |
| 31 | * so don't waste time setting them. |
| 32 | */ |
| 33 | if ((c = _filbuf(iop)) == EOF) |
| 34 | break; |
| 35 | *ptr++ = c; |
| 36 | s--; |
| 37 | } |
| 38 | if (iop->_cnt >= s) { |
| 39 | bcopy(iop->_ptr, ptr, s); |
| 40 | iop->_ptr += s; |
| 41 | iop->_cnt -= s; |
| 42 | return (count); |
| 43 | } |
| 44 | } |
| 45 | return (size != 0 ? count - ((s + size - 1) / size) : 0); |
| 46 | } |