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Annotation of coherent/d/usr/lib/libcurses/need.c, revision 1.1.1.1

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                     11:  *     An unpublished work by INETCO Systems, Ltd.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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