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Annotation of researchv10no/cmd/clear/clear.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)clear.c     4.1 (Berkeley) 10/1/80";
        !             2: /* load me with -ltermlib */
        !             3: /* #include <retrofit.h> on version 6 */
        !             4: /*
        !             5:  * clear - clear the screen
        !             6:  */
        !             7: 
        !             8: #include <stdio.h>
        !             9: #include <sgtty.h>
        !            10: 
        !            11: char   *getenv();
        !            12: char   *tgetstr();
        !            13: char   PC;
        !            14: short  ospeed;
        !            15: #undef putchar
        !            16: int    putchar();
        !            17: 
        !            18: main()
        !            19: {
        !            20:        char *cp = getenv("TERM");
        !            21:        char clbuf[20];
        !            22:        char pcbuf[20];
        !            23:        char *clbp = clbuf;
        !            24:        char *pcbp = pcbuf;
        !            25:        char *clear;
        !            26:        char buf[1024];
        !            27:        char *pc;
        !            28:        struct sgttyb tty;
        !            29: 
        !            30:        gtty(1, &tty);
        !            31:        ospeed = tty.sg_ospeed;
        !            32:        if (cp == (char *) 0)
        !            33:                exit(1);
        !            34:        if (tgetent(buf, cp) != 1)
        !            35:                exit(1);
        !            36:        pc = tgetstr("pc", &pcbp);
        !            37:        if (pc)
        !            38:                PC = *pc;
        !            39:        clear = tgetstr("cl", &clbp);
        !            40:        if (clear)
        !            41:                tputs(clear, tgetnum("li"), putchar);
        !            42:        exit (clear != (char *) 0);
        !            43: }

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