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Annotation of 43BSDReno/usr.bin/window/ttoutput.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Edward Wang at The University of California, Berkeley.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)ttoutput.c 3.9 (Berkeley) 6/6/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "ww.h"
        !            28: #include "tt.h"
        !            29: #include <sys/errno.h>
        !            30: 
        !            31: /*
        !            32:  * Buffered output package.
        !            33:  * We need this because stdio fails on non-blocking writes.
        !            34:  */
        !            35: 
        !            36: ttflush()
        !            37: {
        !            38:        register char *p;
        !            39:        register n;
        !            40:        extern errno;
        !            41: 
        !            42:        wwnflush++;
        !            43:        for (p = tt_ob; p < tt_obp;) {
        !            44:                wwnwr++;
        !            45:                n = write(1, p, tt_obp - p);
        !            46:                if (n < 0) {
        !            47:                        wwnwre++;
        !            48:                        if (errno != EWOULDBLOCK) {
        !            49:                                /* can't deal with this */
        !            50:                                p = tt_obp;
        !            51:                        }
        !            52:                } else if (n == 0) {
        !            53:                        /* what to do? */
        !            54:                        wwnwrz++;
        !            55:                } else {
        !            56:                        wwnwrc += n;
        !            57:                        p += n;
        !            58:                }
        !            59:        }
        !            60:        tt_obp = tt_ob;
        !            61: }
        !            62: 
        !            63: ttputs(s)
        !            64: register char *s;
        !            65: {
        !            66:        while (*s)
        !            67:                ttputc(*s++);
        !            68: }
        !            69: 
        !            70: ttwrite(s, n)
        !            71:        register char *s;
        !            72:        register n;
        !            73: {
        !            74:        switch (n) {
        !            75:        case 0:
        !            76:                break;
        !            77:        case 1:
        !            78:                ttputc(*s);
        !            79:                break;
        !            80:        case 2:
        !            81:                if (tt_obe - tt_obp < 2)
        !            82:                        (*tt.tt_flush)();
        !            83:                *tt_obp++ = *s++;
        !            84:                *tt_obp++ = *s;
        !            85:                break;
        !            86:        case 3:
        !            87:                if (tt_obe - tt_obp < 3)
        !            88:                        (*tt.tt_flush)();
        !            89:                *tt_obp++ = *s++;
        !            90:                *tt_obp++ = *s++;
        !            91:                *tt_obp++ = *s;
        !            92:                break;
        !            93:        case 4:
        !            94:                if (tt_obe - tt_obp < 4)
        !            95:                        (*tt.tt_flush)();
        !            96:                *tt_obp++ = *s++;
        !            97:                *tt_obp++ = *s++;
        !            98:                *tt_obp++ = *s++;
        !            99:                *tt_obp++ = *s;
        !           100:                break;
        !           101:        case 5:
        !           102:                if (tt_obe - tt_obp < 5)
        !           103:                        (*tt.tt_flush)();
        !           104:                *tt_obp++ = *s++;
        !           105:                *tt_obp++ = *s++;
        !           106:                *tt_obp++ = *s++;
        !           107:                *tt_obp++ = *s++;
        !           108:                *tt_obp++ = *s;
        !           109:                break;
        !           110:        default:
        !           111:                while (n > 0) {
        !           112:                        register m;
        !           113: 
        !           114:                        while ((m = tt_obe - tt_obp) == 0)
        !           115:                                (*tt.tt_flush)();
        !           116:                        if ((m = tt_obe - tt_obp) > n)
        !           117:                                m = n;
        !           118:                        bcopy(s, tt_obp, m);
        !           119:                        tt_obp += m;
        !           120:                        s += m;
        !           121:                        n -= m;
        !           122:                }
        !           123:        }
        !           124: }

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