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Annotation of 41BSD/lib/libtermlib/tputs.c, revision 1.1

1.1     ! root        1: /* Copyright (c) 1979 Regents of the University of California */
        !             2: #include <sgtty.h>
        !             3: #include <ctype.h>
        !             4: 
        !             5: /*
        !             6:  * The following array gives the number of tens of milliseconds per
        !             7:  * character for each speed as returned by gtty.  Thus since 300
        !             8:  * baud returns a 7, there are 33.3 milliseconds per char at 300 baud.
        !             9:  */
        !            10: static
        !            11: short  tmspc10[] = {
        !            12:        0, 2000, 1333, 909, 743, 666, 500, 333, 166, 83, 55, 41, 20, 10
        !            13: };
        !            14: 
        !            15: short  ospeed;
        !            16: char   PC;
        !            17: 
        !            18: /*
        !            19:  * Put the character string cp out, with padding.
        !            20:  * The number of affected lines is affcnt, and the routine
        !            21:  * used to output one character is outc.
        !            22:  */
        !            23: tputs(cp, affcnt, outc)
        !            24:        register char *cp;
        !            25:        int affcnt;
        !            26:        int (*outc)();
        !            27: {
        !            28:        register int i = 0;
        !            29:        register int mspc10;
        !            30: 
        !            31:        if (cp == 0)
        !            32:                return;
        !            33: 
        !            34:        /*
        !            35:         * Convert the number representing the delay.
        !            36:         */
        !            37:        if (isdigit(*cp)) {
        !            38:                do
        !            39:                        i = i * 10 + *cp++ - '0';
        !            40:                while (isdigit(*cp));
        !            41:        }
        !            42:        i *= 10;
        !            43:        if (*cp == '.') {
        !            44:                cp++;
        !            45:                if (isdigit(*cp))
        !            46:                        i += *cp - '0';
        !            47:                /*
        !            48:                 * Only one digit to the right of the decimal point.
        !            49:                 */
        !            50:                while (isdigit(*cp))
        !            51:                        cp++;
        !            52:        }
        !            53: 
        !            54:        /*
        !            55:         * If the delay is followed by a `*', then
        !            56:         * multiply by the affected lines count.
        !            57:         */
        !            58:        if (*cp == '*')
        !            59:                cp++, i *= affcnt;
        !            60: 
        !            61:        /*
        !            62:         * The guts of the string.
        !            63:         */
        !            64:        while (*cp)
        !            65:                (*outc)(*cp++);
        !            66: 
        !            67:        /*
        !            68:         * If no delay needed, or output speed is
        !            69:         * not comprehensible, then don't try to delay.
        !            70:         */
        !            71:        if (i == 0)
        !            72:                return;
        !            73:        if (ospeed <= 0 || ospeed >= (sizeof tmspc10 / sizeof tmspc10[0]))
        !            74:                return;
        !            75: 
        !            76:        /*
        !            77:         * Round up by a half a character frame,
        !            78:         * and then do the delay.
        !            79:         * Too bad there are no user program accessible programmed delays.
        !            80:         * Transmitting pad characters slows many
        !            81:         * terminals down and also loads the system.
        !            82:         */
        !            83:        mspc10 = tmspc10[ospeed];
        !            84:        i += mspc10 / 2;
        !            85:        for (i /= mspc10; i > 0; i--)
        !            86:                (*outc)(PC);
        !            87: }

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