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Annotation of 43BSDReno/lib/libc/stdio/freopen.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[] = "@(#)freopen.c  5.2 (Berkeley) 3/9/86";
        !             9: #endif LIBC_SCCS and not lint
        !            10: 
        !            11: #include <sys/types.h>
        !            12: #include <sys/file.h>
        !            13: #include <stdio.h>
        !            14: 
        !            15: FILE *
        !            16: freopen(file, mode, iop)
        !            17:        char *file;
        !            18:        register char *mode;
        !            19:        register FILE *iop;
        !            20: {
        !            21:        register f, rw, oflags;
        !            22: 
        !            23:        rw = (mode[1] == '+');
        !            24: 
        !            25:        fclose(iop);
        !            26: 
        !            27:        switch (*mode) {
        !            28:        case 'a':
        !            29:                oflags = O_CREAT | (rw ? O_RDWR : O_WRONLY);
        !            30:                break;
        !            31:        case 'r':
        !            32:                oflags = rw ? O_RDWR : O_RDONLY;
        !            33:                break;
        !            34:        case 'w':
        !            35:                oflags = O_TRUNC | O_CREAT | (rw ? O_RDWR : O_WRONLY);
        !            36:                break;
        !            37:        default:
        !            38:                return (NULL);
        !            39:        }
        !            40: 
        !            41:        f = open(file, oflags, 0666);
        !            42:        if (f < 0)
        !            43:                return (NULL);
        !            44: 
        !            45:        if (*mode == 'a')
        !            46:                lseek(f, (off_t)0, L_XTND);
        !            47: 
        !            48:        iop->_cnt = 0;
        !            49:        iop->_file = f;
        !            50:        iop->_bufsiz = 0;
        !            51:        if (rw)
        !            52:                iop->_flag = _IORW;
        !            53:        else if (*mode == 'r')
        !            54:                iop->_flag = _IOREAD;
        !            55:        else
        !            56:                iop->_flag = _IOWRT;
        !            57:        iop->_base = iop->_ptr = NULL;
        !            58:        return (iop);
        !            59: }

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