projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 586c39b1 DF |
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 | ||
| 2ce81398 DS |
7 | #if defined(LIBC_SCCS) && !defined(lint) |
| 8 | static char sccsid[] = "@(#)filbuf.c 5.3 (Berkeley) %G%"; | |
| 9 | #endif LIBC_SCCS and not lint | |
| 586c39b1 | 10 | |
| 4216ca33 | 11 | #include <stdio.h> |
| f4c06a32 KM |
12 | #include <sys/types.h> |
| 13 | #include <sys/stat.h> | |
| 4216ca33 BJ |
14 | char *malloc(); |
| 15 | ||
| 16 | _filbuf(iop) | |
| 17 | register FILE *iop; | |
| 18 | { | |
| f4c06a32 KM |
19 | int size; |
| 20 | struct stat stbuf; | |
| 7baa89ad | 21 | extern char *_smallbuf; |
| dbce0e17 | 22 | char c; |
| 4216ca33 | 23 | |
| d8af6b8b MT |
24 | if (iop->_flag & _IORW) |
| 25 | iop->_flag |= _IOREAD; | |
| 26 | ||
| 4216ca33 BJ |
27 | if ((iop->_flag&_IOREAD) == 0) |
| 28 | return(EOF); | |
| 9acf07ab | 29 | if (iop->_flag&(_IOSTRG|_IOEOF)) |
| 4216ca33 BJ |
30 | return(EOF); |
| 31 | tryagain: | |
| 32 | if (iop->_base==NULL) { | |
| 33 | if (iop->_flag&_IONBF) { | |
| 7baa89ad | 34 | iop->_base = _smallbuf ? &_smallbuf[fileno(iop)] : &c; |
| 4216ca33 BJ |
35 | goto tryagain; |
| 36 | } | |
| f4c06a32 KM |
37 | if (fstat(fileno(iop), &stbuf) < 0 || stbuf.st_blksize <= NULL) |
| 38 | size = BUFSIZ; | |
| 39 | else | |
| 40 | size = stbuf.st_blksize; | |
| 63b1c981 RC |
41 | if ((iop->_base = malloc(size)) == NULL) { |
| 42 | iop->_flag |= _IONBF; | |
| 43 | goto tryagain; | |
| 4216ca33 | 44 | } |
| 63b1c981 | 45 | iop->_flag |= _IOMYBUF; |
| f4c06a32 | 46 | iop->_bufsiz = size; |
| 4216ca33 | 47 | } |
| 4e0517a3 KM |
48 | if (iop == stdin) { |
| 49 | if (stdout->_flag&_IOLBF) | |
| 50 | fflush(stdout); | |
| 51 | if (stderr->_flag&_IOLBF) | |
| 52 | fflush(stderr); | |
| 53 | } | |
| f4c06a32 KM |
54 | iop->_cnt = read(fileno(iop), iop->_base, |
| 55 | iop->_flag & _IONBF ? 1 : iop->_bufsiz); | |
| 25d7b8e8 | 56 | iop->_ptr = iop->_base; |
| dbce0e17 S |
57 | if (iop->_flag & _IONBF && iop->_base == &c) |
| 58 | iop->_base = NULL; | |
| 4216ca33 | 59 | if (--iop->_cnt < 0) { |
| d8af6b8b | 60 | if (iop->_cnt == -1) { |
| 4216ca33 | 61 | iop->_flag |= _IOEOF; |
| d8af6b8b MT |
62 | if (iop->_flag & _IORW) |
| 63 | iop->_flag &= ~_IOREAD; | |
| 64 | } else | |
| 4216ca33 BJ |
65 | iop->_flag |= _IOERR; |
| 66 | iop->_cnt = 0; | |
| 41e01b3e | 67 | return(EOF); |
| 4216ca33 BJ |
68 | } |
| 69 | return(*iop->_ptr++&0377); | |
| 70 | } |