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Annotation of 43BSDReno/lib/libc/stdio/fdopen.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #if defined(LIBC_SCCS) && !defined(lint)
                      8: static char sccsid[] = "@(#)fdopen.c   5.2 (Berkeley) 3/9/86";
                      9: #endif LIBC_SCCS and not lint
                     10: 
                     11: /*
                     12:  * Unix routine to do an "fopen" on file descriptor
                     13:  * The mode has to be repeated because you can't query its
                     14:  * status
                     15:  */
                     16: 
                     17: #include <sys/types.h>
                     18: #include <sys/file.h>
                     19: #include <stdio.h>
                     20: 
                     21: FILE *
                     22: fdopen(fd, mode)
                     23:        register char *mode;
                     24: {
                     25:        extern FILE *_findiop();
                     26:        static int nofile = -1;
                     27:        register FILE *iop;
                     28: 
                     29:        if (nofile < 0)
                     30:                nofile = getdtablesize();
                     31: 
                     32:        if (fd < 0 || fd >= nofile)
                     33:                return (NULL);
                     34: 
                     35:        iop = _findiop();
                     36:        if (iop == NULL)
                     37:                return (NULL);
                     38: 
                     39:        iop->_cnt = 0;
                     40:        iop->_file = fd;
                     41:        iop->_bufsiz = 0;
                     42:        iop->_base = iop->_ptr = NULL;
                     43: 
                     44:        switch (*mode) {
                     45:        case 'r':
                     46:                iop->_flag = _IOREAD;
                     47:                break;
                     48:        case 'a':
                     49:                lseek(fd, (off_t)0, L_XTND);
                     50:                /* fall into ... */
                     51:        case 'w':
                     52:                iop->_flag = _IOWRT;
                     53:                break;
                     54:        default:
                     55:                return (NULL);
                     56:        }
                     57: 
                     58:        if (mode[1] == '+')
                     59:                iop->_flag = _IORW;
                     60: 
                     61:        return (iop);
                     62: }

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