Commit | Line | Data |
---|---|---|
4216ca33 BJ |
1 | /* @(#)filbuf.c 4.1 (Berkeley) %G% */ |
2 | #include <stdio.h> | |
3 | char *malloc(); | |
4 | ||
5 | _filbuf(iop) | |
6 | register FILE *iop; | |
7 | { | |
8 | static char smallbuf[_NFILE]; | |
9 | ||
10 | if ((iop->_flag&_IOREAD) == 0) | |
11 | return(EOF); | |
12 | if (iop->_flag&_IOSTRG) | |
13 | return(EOF); | |
14 | tryagain: | |
15 | if (iop->_base==NULL) { | |
16 | if (iop->_flag&_IONBF) { | |
17 | iop->_base = &smallbuf[fileno(iop)]; | |
18 | goto tryagain; | |
19 | } | |
20 | if ((iop->_base = malloc(BUFSIZ)) == NULL) { | |
21 | iop->_flag |= _IONBF; | |
22 | goto tryagain; | |
23 | } | |
24 | iop->_flag |= _IOMYBUF; | |
25 | } | |
26 | iop->_ptr = iop->_base; | |
27 | if (iop == stdin && (stdout->_flag&_IOLBF)) | |
28 | fflush(stdout); | |
29 | iop->_cnt = read(fileno(iop), iop->_ptr, iop->_flag&_IONBF?1:BUFSIZ); | |
30 | if (--iop->_cnt < 0) { | |
31 | if (iop->_cnt == -1) | |
32 | iop->_flag |= _IOEOF; | |
33 | else | |
34 | iop->_flag |= _IOERR; | |
35 | iop->_cnt = 0; | |
36 | return(-1); | |
37 | } | |
38 | return(*iop->_ptr++&0377); | |
39 | } |