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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  */
        !            12: 
        !            13: #ifndef lint
        !            14: static char sccsid[] = "@(#)termin.c   3.2 (Berkeley) 3/28/88";
        !            15: #endif /* not lint */
        !            16: 
        !            17: /* this takes characters from the keyboard, and produces 3270 keystroke
        !            18:        codes
        !            19:  */
        !            20: 
        !            21: #include <stdio.h>
        !            22: #include <ctype.h>
        !            23: 
        !            24: #include "../general/general.h"
        !            25: #include "../ctlr/function.h"
        !            26: #include "../ctlr/inbound.ext"
        !            27: #include "../ctlr/outbound.ext"
        !            28: #include "../telnet.ext"
        !            29: #include "termin.ext"
        !            30: 
        !            31: #include "../api/astosc.h"
        !            32: #include "state.h"
        !            33: 
        !            34: #include "../general/globals.h"
        !            35: 
        !            36: #define IsControl(c)   (!isprint(c) || (isspace(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 unsigned char
        !            46:        ourBuffer[100],         /* where we store stuff */
        !            47:        *ourPHead = ourBuffer,  /* first character in buffer */
        !            48:        *ourPTail = ourBuffer,  /* where next character goes */
        !            49:        *TransPointer = 0;      /* For transparent mode data */
        !            50: 
        !            51: static int InControl;
        !            52: static int WaitingForSynch;
        !            53: 
        !            54: static struct astosc
        !            55:        *spacePTR = 0;          /* Space is hard to enter */
        !            56: 
        !            57: static state
        !            58:        *headOfControl = 0;     /* where we enter code state table */
        !            59: 
        !            60: #define FullChar       ((ourPTail+5) >= ourBuffer+sizeof ourBuffer)
        !            61: #define EmptyChar      (ourPTail == ourPHead)
        !            62: 
        !            63: 
        !            64: /*
        !            65:  * init_keyboard()
        !            66:  *
        !            67:  * Initialize the keyboard variables.
        !            68:  */
        !            69: 
        !            70: void
        !            71: init_keyboard()
        !            72: {
        !            73:     ourPHead = ourPTail = ourBuffer;
        !            74:     InControl = 0;
        !            75:     WaitingForSynch = 0;
        !            76: }
        !            77: 
        !            78: 
        !            79: /*
        !            80:  * Initialize the keyboard mapping file.
        !            81:  */
        !            82: 
        !            83: void
        !            84: InitMapping()
        !            85: {
        !            86:     extern state *InitControl();
        !            87:     register struct astosc *ptr;
        !            88: 
        !            89:     if (!headOfControl) {
        !            90:        /* need to initialize */
        !            91:        headOfControl = InitControl((char *)0, 0, ascii_to_index);
        !            92:        if (!headOfControl) {           /* should not occur */
        !            93:            quit();
        !            94:        }
        !            95:        for (ptr = &astosc[0]; ptr <= &astosc[highestof(astosc)]; ptr++) {
        !            96:            if (ptr->function == FCN_SPACE) {
        !            97:                spacePTR = ptr;
        !            98:            }
        !            99:        }
        !           100:     }
        !           101: }
        !           102: 
        !           103: 
        !           104: /* AddChar - put a function index in our buffer */
        !           105: 
        !           106: static void
        !           107: AddChar(c)
        !           108: int    c;
        !           109: {
        !           110:     if (!FullChar) {
        !           111:        *ourPTail++ = c;
        !           112:     } else {
        !           113:        RingBell("Typeahead buffer full");
        !           114:     }
        !           115: }
        !           116: 
        !           117: /* FlushChar - put everything where it belongs */
        !           118: 
        !           119: static void
        !           120: FlushChar()
        !           121: {
        !           122:     ourPTail = ourBuffer;
        !           123:     ourPHead = ourBuffer;
        !           124: }
        !           125: 
        !           126: void
        !           127: TransInput(onoff, mode)
        !           128: int    mode;                   /* Which KIND of transparent input */
        !           129: int    onoff;                  /* Going in, or coming out */
        !           130: {
        !           131:     if (onoff) {
        !           132:        /* Flush pending input */
        !           133:        FlushChar();
        !           134:        TransPointer = ourBuffer;
        !           135:     } else {
        !           136:     }
        !           137: }
        !           138: 
        !           139: int
        !           140: TerminalIn()
        !           141: {
        !           142:     /* send data from us to next link in stream */
        !           143:     int work = 0;
        !           144:     register struct astosc *ptr;
        !           145: 
        !           146:     while (!EmptyChar) {                       /* send up the link */
        !           147:        if (*ourPHead == ' ') {
        !           148:            ptr = spacePTR;
        !           149:        } else {
        !           150:            ptr = &astosc[*ourPHead];
        !           151:        }
        !           152:        if (AcceptKeystroke(ptr->scancode, ptr->shiftstate) == 1) {
        !           153:            ourPHead++;
        !           154:            work = 1;
        !           155:        } else {
        !           156:            break;
        !           157:        }
        !           158:     }
        !           159: 
        !           160:     if (EmptyChar) {
        !           161:        FlushChar();
        !           162:     }
        !           163:        /* return value answers question: "did we do anything useful?" */
        !           164:     return work;
        !           165: }
        !           166: 
        !           167: int
        !           168: DataFromTerminal(buffer, count)
        !           169: register char  *buffer;                /* the data read in */
        !           170: register int   count;                  /* how many bytes in this buffer */
        !           171: {
        !           172:     register state *regControlPointer;
        !           173:     register char c;
        !           174:     register int result;
        !           175:     int origCount;
        !           176:     extern int bellwinup;
        !           177:     static state *controlPointer;
        !           178: 
        !           179:     if (TransPointer) {
        !           180:        int i;
        !           181: 
        !           182:        if ((count+TransPointer) >= (ourBuffer+sizeof ourBuffer)) {
        !           183:            i = ourBuffer+sizeof ourBuffer-TransPointer;
        !           184:        } else {
        !           185:            i = count;
        !           186:        }
        !           187:        while (i--) {
        !           188:            c = (*buffer++)&0x7f;
        !           189:            *TransPointer++ = c|0x80;
        !           190:            if (c == '\r') {
        !           191:                SendTransparent(ourBuffer, TransPointer-ourBuffer);
        !           192:                TransPointer = 0;               /* Done */
        !           193:                break;
        !           194:            }
        !           195:        }
        !           196:        return count;
        !           197:     }
        !           198: 
        !           199:     if (bellwinup) {
        !           200:        BellOff();
        !           201:     }
        !           202: 
        !           203:     origCount = count;
        !           204: 
        !           205:     while (count) {
        !           206:        c = *buffer++&0x7f;
        !           207:        count--;
        !           208: 
        !           209:        if (!InControl && !IsControl(c)) {
        !           210:            AddChar(c);                 /* add ascii character */
        !           211:        } else {
        !           212:            if (!InControl) {           /* first character of sequence */
        !           213:                InControl = 1;
        !           214:                controlPointer = headOfControl;
        !           215:            }
        !           216:            /* control pointer points to current position in state table */
        !           217:            for (regControlPointer = controlPointer; ;
        !           218:                        regControlPointer = NextState(regControlPointer)) {
        !           219:                if (!regControlPointer) {       /* ran off end */
        !           220:                    RingBell("Invalid control sequence");
        !           221:                    regControlPointer = headOfControl;
        !           222:                    InControl = 0;
        !           223:                    count = 0;          /* Flush current input */
        !           224:                    break;
        !           225:                }
        !           226:                if ((regControlPointer->match == c) /* hit this character */
        !           227:                        || (regControlPointer->match == MATCH_ANY)) {
        !           228:                    result = regControlPointer->result;
        !           229:                    if (result == STATE_GOTO) {
        !           230:                        regControlPointer = regControlPointer->address;
        !           231:                        break;                  /* go to next character */
        !           232:                    }
        !           233:                    if (WaitingForSynch) {
        !           234:                        if (astosc[result].function == FCN_SYNCH) {
        !           235:                            WaitingForSynch = 0;
        !           236:                        } else {
        !           237:                            RingBell("Need to type synch character");
        !           238:                        }
        !           239:                    }
        !           240:                    else if (astosc[result].function == FCN_FLINP) {
        !           241:                        FlushChar();            /* Don't add FLINP */
        !           242:                    } else {
        !           243:                        if (astosc[result].function == FCN_MASTER_RESET) {
        !           244:                            FlushChar();
        !           245:                        }
        !           246:                        AddChar(result);                /* add this code */
        !           247:                    }
        !           248:                    InControl = 0;      /* out of control now */
        !           249:                    break;
        !           250:                }
        !           251:            }
        !           252:            controlPointer = regControlPointer;         /* save state */
        !           253:        }
        !           254:     }
        !           255:     (void) TerminalIn();                       /* try to send data */
        !           256:     return(origCount-count);
        !           257: }

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