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Annotation of researchv10no/cmd/cfront/libC/iostream/streamdefs.h, revision 1.1

1.1     ! root        1: /*ident        "@(#)ctrans:lib/stream/streamdefs.h     1.1.2.1" */
        !             2: /**************************************************************************
        !             3:                        Copyright (c) 1984 AT&T
        !             4:                          All Rights Reserved   
        !             5: 
        !             6:        THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T
        !             7:        
        !             8:        The copyright notice above does not evidence any        
        !             9:        actual or intended publication of such source code.
        !            10: 
        !            11: streamdefs.h:
        !            12: 
        !            13: *****************************************************************************/
        !            14: 
        !            15: 
        !            16: // This file contains #defines for controlling conditional compilation 
        !            17: // of the stream library
        !            18: 
        !            19: 
        !            20: // The follwing functions adjust for machine dependencies
        !            21: 
        !            22: #define BREAKEVEN      10    
        !            23:                        /* The approximate length of a string
        !            24:                         * for which it is faster to do a strncpy
        !            25:                         * than a char by char loop. If BREAKEVEN is 0 
        !            26:                         * then strncpy is always better.  If it is <0 then 
        !            27:                         * loop is always better, (e.g. if strncopy does
        !            28:                         * a char by char copy anyway.)
        !            29:                         */
        !            30: 
        !            31: #define SEEK_ARITH_OK  1
        !            32:                        /* System supports arithmetic on stream positions.
        !            33:                         * I.e. if file is at a position and we read or
        !            34:                         * write n bytes we can find the new position
        !            35:                         * by adding n to old position. (Providing
        !            36:                         * O_APPEND isn't set in on open.)
        !            37:                         */
        !            38: 
        !            39: static const int PTRBASE = ios::hex ;
        !            40:                        /* base for output of pointers (void*) */
        !            41: 
        !            42: // There is one important machine dependent feature of this implementation
        !            43: // It assumes that it can always create a pointer to the byte after
        !            44: // a char array used as a buffer, and that pointer will be greater than
        !            45: // any pointer into the array. 
        !            46: // My reading of the ANSI standard is that this assumption is permissible,
        !            47: // but I can imagine segmented architectures where it fails.
        !            48: 
        !            49: /* #define VSPRINTF vsprintf */
        !            50: 
        !            51:                        /* If defined, the name of a "vsprintf" function.
        !            52:                         * If not defined, 
        !            53:                         * various non-portable kludges are used in
        !            54:                         * oldformat.c
        !            55:                         */
        !            56: 
        !            57: static const int STREAMBUFSIZE = 1024 ;
        !            58:                        // The default buffer size.
        !            59: 
        !            60: /*******
        !            61:        #define O_CREAT 01000 
        !            62:        #define O_TRUNC 02000 
        !            63:        #define O_EXCL  04000
        !            64:  *******/
        !            65:                        /* Used in filebuf.c.  Define if your system
        !            66:                         * needs it to have a value different from
        !            67:                         * that indicated here, but doesn't
        !            68:                         * define it in standard system headers
        !            69:                         */

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