Commit | Line | Data |
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39195eb1 BJ |
1 | /* @(#)fdopen.c 4.1 (Berkeley) %G% */ |
2 | /* | |
3 | * Unix routine to do an "fopen" on file descriptor | |
4 | * The mode has to be repeated because you can't query its | |
5 | * status | |
6 | */ | |
7 | ||
8 | #include <stdio.h> | |
9 | #include <errno.h> | |
10 | ||
11 | FILE * | |
12 | fdopen(fd, mode) | |
13 | register char *mode; | |
14 | { | |
15 | extern int errno; | |
16 | register FILE *iop; | |
17 | extern FILE *_lastbuf; | |
18 | ||
19 | for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT); iop++) | |
20 | if (iop >= _lastbuf) | |
21 | return(NULL); | |
22 | iop->_cnt = 0; | |
23 | iop->_file = fd; | |
24 | if (*mode != 'r') { | |
25 | iop->_flag |= _IOWRT; | |
26 | if (*mode == 'a') | |
27 | lseek(fd, 0L, 2); | |
28 | } else | |
29 | iop->_flag |= _IOREAD; | |
30 | return(iop); | |
31 | } |