4.3BSD - /usr/src/ucb/tn3270/termin.c

   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: }

Defined functions

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Defined macros