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Annotation of 43BSD/ucb/tn3270/termin.c, revision 1.1

1.1     ! root        1: /*
        !             2:  *     Copyright 1984, 1985 by the Regents of the University of
        !             3:  *     California and by Gregory Glenn Minshall.
        !             4:  *
        !             5:  *     Permission to use, copy, modify, and distribute these
        !             6:  *     programs and their documentation for any purpose and
        !             7:  *     without fee is hereby granted, provided that this
        !             8:  *     copyright and permission appear on all copies and
        !             9:  *     supporting documentation, the name of the Regents of
        !            10:  *     the University of California not be used in advertising
        !            11:  *     or publicity pertaining to distribution of the programs
        !            12:  *     without specific prior permission, and notice be given in
        !            13:  *     supporting documentation that copying and distribution is
        !            14:  *     by permission of the Regents of the University of California
        !            15:  *     and by Gregory Glenn Minshall.  Neither the Regents of the
        !            16:  *     University of California nor Gregory Glenn Minshall make
        !            17:  *     representations about the suitability of this software
        !            18:  *     for any purpose.  It is provided "as is" without
        !            19:  *     express or implied warranty.
        !            20:  */
        !            21: 
        !            22: 
        !            23: /* this takes characters from the keyboard, and produces 3270 keystroke
        !            24:        codes
        !            25:  */
        !            26: 
        !            27: #ifndef        lint
        !            28: static char    sccsid[] = "@(#)termin.c        2.1     4/11/85";
        !            29: #endif /* ndef lint */
        !            30: 
        !            31: #include <ctype.h>
        !            32: 
        !            33: #include "m4.out"              /* output of termcodes.m4 */
        !            34: #include "state.h"
        !            35: 
        !            36: #define IsControl(c)   (!isprint(c) && ((c) != ' '))
        !            37: 
        !            38: #define NextState(x)   (x->next)
        !            39: 
        !            40: /* XXX temporary - hard code in the state table */
        !            41: 
        !            42: #define MATCH_ANY 0xff                 /* actually, match any character */
        !            43: 
        !            44: 
        !            45: static char
        !            46:        ourBuffer[100],         /* where we store stuff */
        !            47:        *ourPHead = ourBuffer,  /* first character in buffer */
        !            48:        *ourPTail = ourBuffer;  /* where next character goes */
        !            49: 
        !            50: static state
        !            51:        *headOfControl = 0;     /* where we enter code state table */
        !            52: 
        !            53: #define FullChar       (ourPTail == ourBuffer+sizeof ourBuffer)
        !            54: #define EmptyChar      (ourPTail == ourPHead)
        !            55: 
        !            56: 
        !            57: /* AddChar - put a character in our buffer */
        !            58: 
        !            59: static
        !            60: AddChar(c)
        !            61: int    c;
        !            62: {
        !            63:     if (!FullChar) {
        !            64:        *ourPTail++ = (char) c;
        !            65:     } else {
        !            66:        RingBell();
        !            67:     }
        !            68: }
        !            69: 
        !            70: /* FlushChar - put everything where it belongs */
        !            71: 
        !            72: static
        !            73: FlushChar()
        !            74: {
        !            75:     ourPTail = ourBuffer;
        !            76:     ourPHead = ourBuffer;
        !            77: }
        !            78: 
        !            79: 
        !            80: int
        !            81: TerminalIn()
        !            82: {
        !            83:     /* send data from us to next link in stream */
        !            84:     int count;
        !            85: 
        !            86:     count = 0;
        !            87: 
        !            88:     if (!EmptyChar) {                  /* send up the link */
        !            89:        count += DataFrom3270(ourPHead, ourPTail-ourPHead);
        !            90:        ourPHead += count;
        !            91:        if (EmptyChar) {
        !            92:            FlushChar();
        !            93:        }
        !            94:     }
        !            95:        /* return value answers question: "did we do anything useful?" */
        !            96:     return(count? 1:0);
        !            97: }
        !            98: 
        !            99: int
        !           100: DataFromTerminal(buffer, count)
        !           101: register char  *buffer;                /* the data read in */
        !           102: register int   count;                  /* how many bytes in this buffer */
        !           103: {
        !           104:     register state *regControlPointer;
        !           105:     register char c;
        !           106:     register int result;
        !           107:     int origCount;
        !           108: 
        !           109:     static int InControl;
        !           110:     static int WaitingForSynch = 0;
        !           111:     static state *controlPointer;
        !           112:     extern state *InitControl();
        !           113: 
        !           114:     if (!headOfControl) {
        !           115:        /* need to initialize */
        !           116:        headOfControl = InitControl();
        !           117:        if (!headOfControl) {           /* should not occur */
        !           118:            quit();
        !           119:        }
        !           120:     }
        !           121: 
        !           122: 
        !           123:     origCount = count;
        !           124: 
        !           125:     while (count) {
        !           126:        c = *buffer++&0x7f;
        !           127:        count--;
        !           128: 
        !           129:        if (!InControl && !IsControl(c)) {
        !           130:            AddChar(c);                 /* add ascii character */
        !           131:        } else {
        !           132:            if (!InControl) {           /* first character of sequence */
        !           133:                InControl = 1;
        !           134:                controlPointer = headOfControl;
        !           135:            }
        !           136:            /* control pointer points to current position in state table */
        !           137:            for (regControlPointer = controlPointer; ;
        !           138:                        regControlPointer = NextState(regControlPointer)) {
        !           139:                if (!regControlPointer) {       /* ran off end */
        !           140:                    RingBell();
        !           141:                    regControlPointer = headOfControl;
        !           142:                    InControl = 0;
        !           143:                    break;
        !           144:                }
        !           145:                if ((regControlPointer->match == c) /* hit this character */
        !           146:                        || (regControlPointer->match == MATCH_ANY)) {
        !           147:                    result = regControlPointer->result;
        !           148:                    if (result == TC_GOTO) {
        !           149:                        regControlPointer = regControlPointer->address;
        !           150:                        break;                  /* go to next character */
        !           151:                    }
        !           152:                    if (WaitingForSynch) {
        !           153:                        if (result == TC_SYNCH) {
        !           154:                            WaitingForSynch = 0;
        !           155:                        } else {
        !           156:                            RingBell();
        !           157:                        }
        !           158:                    }
        !           159:                    else if (result == TC_FLINP) {
        !           160:                        FlushChar();            /* Don't add FLINP */
        !           161:                    } else {
        !           162:                        if (result == TC_MASTER_RESET) {
        !           163:                            FlushChar();
        !           164:                        }
        !           165:                        AddChar(result);                /* add this code */
        !           166:                    }
        !           167:                    InControl = 0;      /* out of control now */
        !           168:                    break;
        !           169:                }
        !           170:            }
        !           171:            controlPointer = regControlPointer;         /* save state */
        !           172:        }
        !           173:     }
        !           174:     (void) TerminalIn();                       /* try to send data */
        !           175:     return(origCount-count);
        !           176: }

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