projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d0391c55 KS |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | #include <stdio.h> | |
| 3 | ||
| 4 | _flsbuf(c, iop) | |
| 5 | register struct _iobuf *iop; | |
| 6 | { | |
| 7 | register n; | |
| 8 | register char *base; | |
| 9 | char c1, *malloc(); | |
| 10 | extern char _sobuf[]; | |
| 11 | ||
| 12 | if ((iop->_flag&_IOWRT)==0) | |
| 13 | _error("writing\n"); | |
| 14 | tryagain: | |
| 15 | if (iop->_flag&_IONBF) { | |
| 16 | c1 = c; | |
| 17 | n = write(fileno(iop), &c1, 1); | |
| 18 | iop->_cnt = 0; | |
| 19 | } else { | |
| 20 | if ((base=iop->_base)==NULL) { | |
| 21 | if (iop==stdout) { | |
| 22 | iop->_base = _sobuf; | |
| 23 | iop->_ptr = _sobuf; | |
| 24 | goto tryagain; | |
| 25 | } | |
| 26 | if ((iop->_base=base=malloc(BUFSIZ)) == NULL) { | |
| 27 | iop->_flag |= _IONBF; | |
| 28 | goto tryagain; | |
| 29 | } | |
| 30 | iop->_flag |= _IOMYBUF; | |
| 31 | n = 1; | |
| 32 | } else if ((n = iop->_ptr - base) > 0) { | |
| 33 | if (iop->_delta && (iop->_flag&_IOREAD)) { | |
| 34 | if(lseek(iop->_file, (long) -iop->_delta, 1)<0) | |
| 35 | _error("Seek error in flsbuf\n"); | |
| 36 | iop->_delta = 0; | |
| 37 | } | |
| 38 | n = write(fileno(iop), base, n); | |
| 39 | if ((iop->_flag & _IOREAD) && | |
| 40 | (0 >(iop->_delta = read(iop->_file, base, BUFSIZ)))) { | |
| 41 | iop->_delta = 0; | |
| 42 | iop->_flag |= _IOERR; | |
| 43 | } | |
| 44 | } | |
| 45 | iop->_cnt = BUFSIZ-1; | |
| 46 | *base++ = c; | |
| 47 | iop->_ptr = base; | |
| 48 | } | |
| 49 | if (n < 0) { | |
| 50 | iop->_flag |= _IOERR; | |
| 51 | return(-1); | |
| 52 | } | |
| 53 | return(c); | |
| 54 | } | |
| 55 | ||
| 56 | fflush(iop) | |
| 57 | register struct _iobuf *iop; | |
| 58 | { | |
| 59 | register char *base; | |
| 60 | register n; | |
| 61 | ||
| 62 | if ((iop->_flag&(_IONBF|_IOWRT))==_IOWRT | |
| 63 | && (base=iop->_base)!=NULL && ((n=iop->_ptr-base)>0) | |
| 64 | && (iop->_flag & _IODIRT)) { | |
| 65 | iop->_ptr = base; | |
| 66 | iop->_cnt = 0; | |
| 67 | if(iop->_delta) { | |
| 68 | if(0>lseek(fileno(iop), (long) -iop->_delta, 1)) { | |
| 69 | _error("Seek error in fflush\n"); | |
| 70 | iop->_flag |= _IOERR; | |
| 71 | } | |
| 72 | iop->_delta = 0; | |
| 73 | } | |
| 74 | if (write(fileno(iop), base, n)!=n) | |
| 75 | iop->_flag |= _IOERR; | |
| 76 | iop->_flag &= ~_IODIRT; | |
| 77 | } | |
| 78 | } | |
| 79 | ||
| 80 | /* | |
| 81 | * Flush buffers on exit | |
| 82 | */ | |
| 83 | ||
| 84 | _cleanup() | |
| 85 | { | |
| 86 | register struct _iobuf *iop; | |
| 87 | extern struct _iobuf *_lastbuf; | |
| 88 | ||
| 89 | for (iop = _iob; iop < _lastbuf; iop++) | |
| 90 | fclose(iop); | |
| 91 | } | |
| 92 | ||
| 93 | fclose(iop) | |
| 94 | register struct _iobuf *iop; | |
| 95 | { | |
| 96 | if (iop->_flag&(_IOREAD|_IOWRT)) { | |
| 97 | fflush(iop); | |
| 98 | close(fileno(iop)); | |
| 99 | if (iop->_flag&_IOMYBUF) | |
| 100 | free(iop->_base); | |
| 101 | } | |
| 102 | iop->_base = NULL; | |
| 103 | iop->_flag &= ~(_IOREAD|_IOWRT|_IONBF|_IOMYBUF|_IOERR|_IOEOF|_IODIRT|_IOSTRG); | |
| 104 | iop->_cnt = 0; | |
| 105 | iop->_delta = 0; | |
| 106 | return(0); | |
| 107 | } |