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