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Annotation of coherent/d/usr/lib/libcurses/need.c, revision 1.1

1.1     ! root        1: /* $Header: /newbits/usr/lib/libcurses/RCS/need.c,v 1.2 91/09/30 13:06:39 bin Exp Locker: bin $
        !             2:  *
        !             3:  *     The  information  contained herein  is a trade secret  of INETCO
        !             4:  *     Systems, and is confidential information.   It is provided under
        !             5:  *     a license agreement,  and may be copied or disclosed  only under
        !             6:  *     the terms of that agreement.   Any reproduction or disclosure of
        !             7:  *     this  material  without  the express  written  authorization  of
        !             8:  *     INETCO Systems or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     Copyright (c) 1989
        !            11:  *     An unpublished work by INETCO Systems, Ltd.
        !            12:  *     All rights reserved.
        !            13:  */
        !            14: 
        !            15: # include      "curses.ext"
        !            16: 
        !            17: #ifdef COHERENT
        !            18: /**
        !            19:  *
        !            20:  * _need( s )
        !            21:  * char * s;
        !            22:  *
        !            23:  *     Input:  s = string which will eventually be passed to _putchar().
        !            24:  *
        !            25:  *     Action: If output buffering is enabled, and there is insufficient
        !            26:  *             room in the output buffer for the specified string,
        !            27:  *             flush the output buffer.
        !            28:  *
        !            29:  *     Return:  0 = atomic output is guaranteed.
        !            30:  *             -1 = buffering disabled.
        !            31:  *
        !            32:  *     Notes:  This attempts to ensure that escape sequences are sent to
        !            33:  *             the terminal in one atomic operation, without being split
        !            34:  *             by other terminal output.
        !            35:  */
        !            36: int
        !            37: _need( s )
        !            38: uchar * s;
        !            39: {
        !            40:        reg FILE * fp = stdout;
        !            41: 
        !            42:        /*
        !            43:         * Stdout exists, and has a buffer allocated.
        !            44:         * _bp = pointer to beginning of buffer.
        !            45:         * _cp = pointer to current char in buffer.
        !            46:         * Flush stdout if insufficient room for string.
        !            47:         */
        !            48:        if ( (fp != NULL) && (fp->_bp != NULL) && (fp->_cp != NULL) ) {
        !            49:                if ( ((fp->_cp - fp->_bp) + strlen(s)) >= BUFSIZ )
        !            50:                        fflush( stdout );
        !            51:                return (0);
        !            52:        }
        !            53: 
        !            54:        /*
        !            55:         * Atomic output by stdio cannot be guaranteed.
        !            56:         */
        !            57:        return (-1);
        !            58: }
        !            59: #endif

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