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Annotation of 43BSD/contrib/mh/miscellany/less/ttyin.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Routines dealing with getting input from the keyboard (i.e. from the user).
        !             3:  */
        !             4: 
        !             5: #include "less.h"
        !             6: 
        !             7: /*
        !             8:  * The boolean "reading" is set true or false according to whether
        !             9:  * we are currently reading from the keyboard.
        !            10:  * This information is used by the signal handling stuff in signal.c.
        !            11:  * {{ There are probably some race conditions here
        !            12:  *    involving the variable "reading". }}
        !            13:  */
        !            14: public int reading;
        !            15: 
        !            16: static int tty;
        !            17: 
        !            18: /*
        !            19:  * Open keyboard for input.
        !            20:  * (Just use file descriptor 2.)
        !            21:  */
        !            22:        public void
        !            23: open_getc()
        !            24: {
        !            25:        tty = 2;
        !            26: }
        !            27: 
        !            28: /*
        !            29:  * Get a character from the keyboard.
        !            30:  */
        !            31:        public int
        !            32: getc()
        !            33: {
        !            34:        char c;
        !            35:        int result;
        !            36: 
        !            37:        reading = 1;
        !            38:        do
        !            39:        {
        !            40:                flush();
        !            41:                result = read(tty, &c, 1);
        !            42:        } while (result != 1);
        !            43:        reading = 0;
        !            44:        return (c & 0177);
        !            45: }

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