projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| dbce0e17 | 1 | /* @(#)filbuf.c 4.11 (Berkeley) %G% */ |
| 4216ca33 | 2 | #include <stdio.h> |
| f4c06a32 KM |
3 | #include <sys/types.h> |
| 4 | #include <sys/stat.h> | |
| 4216ca33 BJ |
5 | char *malloc(); |
| 6 | ||
| 7 | _filbuf(iop) | |
| 8 | register FILE *iop; | |
| 9 | { | |
| f4c06a32 KM |
10 | int size; |
| 11 | struct stat stbuf; | |
| dbce0e17 S |
12 | static char *smallbuf; |
| 13 | static int nfiles; | |
| 14 | char c; | |
| 4216ca33 | 15 | |
| d8af6b8b MT |
16 | if (iop->_flag & _IORW) |
| 17 | iop->_flag |= _IOREAD; | |
| 18 | ||
| 4216ca33 BJ |
19 | if ((iop->_flag&_IOREAD) == 0) |
| 20 | return(EOF); | |
| 9acf07ab | 21 | if (iop->_flag&(_IOSTRG|_IOEOF)) |
| 4216ca33 BJ |
22 | return(EOF); |
| 23 | tryagain: | |
| 24 | if (iop->_base==NULL) { | |
| 25 | if (iop->_flag&_IONBF) { | |
| dbce0e17 S |
26 | if (nfiles <= 0) |
| 27 | nfiles = getdtablesize(); | |
| 28 | if (smallbuf == NULL) | |
| 29 | smallbuf = malloc(nfiles * sizeof *smallbuf); | |
| 30 | iop->_base = smallbuf ? &smallbuf[fileno(iop)] : &c; | |
| 4216ca33 BJ |
31 | goto tryagain; |
| 32 | } | |
| f4c06a32 KM |
33 | if (fstat(fileno(iop), &stbuf) < 0 || stbuf.st_blksize <= NULL) |
| 34 | size = BUFSIZ; | |
| 35 | else | |
| 36 | size = stbuf.st_blksize; | |
| 63b1c981 RC |
37 | if ((iop->_base = malloc(size)) == NULL) { |
| 38 | iop->_flag |= _IONBF; | |
| 39 | goto tryagain; | |
| 4216ca33 | 40 | } |
| 63b1c981 | 41 | iop->_flag |= _IOMYBUF; |
| f4c06a32 | 42 | iop->_bufsiz = size; |
| 4216ca33 | 43 | } |
| 4e0517a3 KM |
44 | if (iop == stdin) { |
| 45 | if (stdout->_flag&_IOLBF) | |
| 46 | fflush(stdout); | |
| 47 | if (stderr->_flag&_IOLBF) | |
| 48 | fflush(stderr); | |
| 49 | } | |
| f4c06a32 KM |
50 | iop->_cnt = read(fileno(iop), iop->_base, |
| 51 | iop->_flag & _IONBF ? 1 : iop->_bufsiz); | |
| 25d7b8e8 | 52 | iop->_ptr = iop->_base; |
| dbce0e17 S |
53 | if (iop->_flag & _IONBF && iop->_base == &c) |
| 54 | iop->_base = NULL; | |
| 4216ca33 | 55 | if (--iop->_cnt < 0) { |
| d8af6b8b | 56 | if (iop->_cnt == -1) { |
| 4216ca33 | 57 | iop->_flag |= _IOEOF; |
| d8af6b8b MT |
58 | if (iop->_flag & _IORW) |
| 59 | iop->_flag &= ~_IOREAD; | |
| 60 | } else | |
| 4216ca33 BJ |
61 | iop->_flag |= _IOERR; |
| 62 | iop->_cnt = 0; | |
| 41e01b3e | 63 | return(EOF); |
| 4216ca33 BJ |
64 | } |
| 65 | return(*iop->_ptr++&0377); | |
| 66 | } |