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Annotation of 42BSD/lib/libc/stdio/fdopen.c, revision 1.1.1.1

1.1       root        1: /* @(#)fdopen.c        4.4 (Berkeley) 9/12/83 */
                      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:        if ((unsigned)fd >= getdtablesize())
                     20:                return (NULL);
                     21:        for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT|_IORW); )
                     22:                if (++iop >= _lastbuf)
                     23:                        return(NULL);
                     24:        iop->_cnt = 0;
                     25:        iop->_file = fd;
                     26:        if (*mode != 'r') {
                     27:                iop->_flag |= _IOWRT;
                     28:                if (*mode == 'a')
                     29:                        lseek(fd, 0L, 2);
                     30:        } else
                     31:                iop->_flag |= _IOREAD;
                     32:        if (mode[1] == '+') {
                     33:                iop->_flag &= ~(_IOREAD|_IOWRT);
                     34:                iop->_flag |= _IORW;
                     35:        }
                     36:        return(iop);
                     37: }

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