1: #include <X/mit-copyright.h>
   2: 
   3: /* Copyright 1985 by the Massachusetts Institute of Technology */
   4: /*
   5:  * Parse and unparse ANSI sequences.
   6:  */
   7: #include    <stdio.h>
   8: #include    <X/Xlib.h>
   9: #include    "ptyx.h"
  10: 
  11: parseseq(c, ap, tek)
  12: register int    c;
  13: register ANSI   *ap;
  14: {
  15:     /*
  16: 	 * Start up sequence if this is a sequence introducer.
  17: 	 */
  18:     if (c==ESC || c==DCS || c==CSI || c==OSC || c==PM || c==APC) {
  19:         ap->a_type = c;
  20:         ap->a_pintro = 0;
  21:         ap->a_final = 0;
  22:         ap->a_inters = 0;
  23:         ap->a_nparam = 0;
  24:         ap->a_nastyf = 0;
  25:         return (-1);
  26:     }
  27:     /*
  28: 	 * Just pass the character through if not in a sequence.
  29: 	 */
  30:     if (ap->a_type == 0)
  31:         return (c);
  32:     /*
  33: 	 * Abort on C1 control, cancel or random communication error.
  34: 	 */
  35:     if ((c>=0x80 && c<=0x9F)) {
  36:         ap->a_type = 0;
  37:         ap->a_pintro = 0;
  38:         ap->a_final = 0;
  39:         return (c);
  40:     }
  41:     /*
  42: 	 * C0 control characters are passed through in the middle,
  43: 	 * except for a couple of special ones in Tek mode.
  44: 	 */
  45:     if (c<0x20 || c==DEL || c==RDEL) {
  46:         if (tek
  47:             && ap->a_pintro==0
  48:             && ap->a_final==0
  49:             && ap->a_inters==0
  50:             && ap->a_nparam==0
  51:             && ap->a_nastyf==0) {
  52:             if (ap->a_type==ESC && (c==FF || c==SUB || c==INQ))
  53:                 goto finalchar;
  54:             if (ap->a_type==CSI && c==US)
  55:                 goto finalchar;
  56:         }
  57:         if (c==CAN || c==SUB) {
  58:             ap->a_type = 0;
  59:             ap->a_pintro = 0;
  60:             ap->a_final = 0;
  61:         }
  62:         return (c);
  63:     }
  64:     c &= 0x7F;
  65:     /*
  66: 	 * Intermediate characters.
  67: 	 */
  68:     if (c>=0x20 && c<=0x2F) {
  69:         ap->a_inters <<= 8;
  70:         ap->a_inters |= c;
  71:         return (-1);
  72:     }
  73:     /*
  74: 	 * Parameter character in DCS, CSI, et al.
  75: 	 */
  76:     if (ap->a_type!=ESC && c>=0x30 && c<=0x3F) {
  77:         if (ap->a_inters != 0)
  78:             ap->a_nastyf = 1;
  79:         /*
  80: 		 * Only "?" and "<" are legal at Digital.
  81: 		 */
  82:         if (c >= 0x3C) {
  83:             if (ap->a_pintro != 0 || ap->a_nparam != 0)
  84:                 ap->a_nastyf = 1;
  85:             ap->a_pintro = c;
  86:             return (-1);
  87:         }
  88:         /*
  89: 		 * set the default flag and init param value to 0
  90: 		 * if we haven't seen any param's yet.
  91: 		 */
  92:         if (ap->a_nparam == 0) {
  93:             ap->a_dflt[ap->a_nparam] = 1;
  94:             ap->a_param[ap->a_nparam++] = 0;
  95:         }
  96:         /*
  97: 		 * ";" or ":", only the ";" is legal at Digital.
  98: 		 */
  99:         if (c >= 0x3A) {
 100:             if (c != 0x3B || ap->a_nparam >= NPARAM)
 101:                 ap->a_nastyf = 1;
 102:             else {
 103:                 ap->a_dflt[ap->a_nparam] = 1;
 104:                 ap->a_param[ap->a_nparam++] = 0;
 105:             }
 106:             return (-1);
 107:         }
 108:         /*
 109: 		 * Part of a numeric parameter.
 110: 		 * Clear the default flag for this param.
 111: 		 */
 112:         ap->a_dflt[ap->a_nparam-1] = 0;
 113:         ap->a_param[ap->a_nparam-1] *= 10;
 114:         ap->a_param[ap->a_nparam-1] += c - 0x30;
 115:         return (-1);
 116:     }
 117:     /*
 118: 	 * C1 control in its 7 bit ESC Fe representation.
 119: 	 */
 120:     if (ap->a_type==ESC && ap->a_inters==0 && c>=0x40 && c<=0x5F) {
 121:         c += 0x40;
 122:         /*
 123: 		 * May need to start up a new sequence.
 124: 		 */
 125:         if (c!=DCS && c!=CSI && c!=OSC && c!=PM && c!=APC) {
 126:             ap->a_type = 0;
 127:             ap->a_pintro = 0;
 128:             ap->a_final = 0;
 129:             return (c);
 130:         }
 131:         ap->a_type  = c;
 132:         ap->a_pintro = 0;
 133:         ap->a_final = 0;
 134:         ap->a_nastyf = 0;
 135:         return (-1);
 136:     }
 137:     /*
 138: 	 * Final character in sequence.
 139: 	 */
 140: finalchar:
 141:     ap->a_final = c;
 142:     return (ap->a_type);
 143: }
 144: 
 145: unparseseq(ap, tx8flag, fd)
 146: register ANSI   *ap;
 147: {
 148:     register int    c;
 149:     register int    i;
 150:     register int    inters;
 151: 
 152:     c = ap->a_type;
 153:     if (c>=0x80 && c<=0x9F && tx8flag==0) {
 154:         unparseputc(ESC, fd);
 155:         c -= 0x40;
 156:     }
 157:     unparseputc(c, fd);
 158:     c = ap->a_type;
 159:     if (c==ESC || c==DCS || c==CSI || c==OSC || c==PM || c==APC) {
 160:         if (ap->a_pintro != 0)
 161:             unparseputc(ap->a_pintro, fd);
 162:         for (i=0; i<ap->a_nparam; ++i) {
 163:             if (i != 0)
 164:                 unparseputc(';', fd);
 165:             if (ap->a_param[i] != 0)
 166:                 unparseputn(ap->a_param[i], fd);
 167:         }
 168:         inters = ap->a_inters;
 169:         for (i=3; i>=0; --i)
 170:             c = (inters >> (8*i)) & 0xff;
 171:             if (c != 0)
 172:                 unparseputc(c, fd);
 173:         unparseputc(ap->a_final, fd);
 174:     }
 175: }
 176: 
 177: unparseputn(n, fd)
 178: unsigned int    n;
 179: {
 180:     unsigned int    q;
 181: 
 182:     q = n/10;
 183:     if (q != 0)
 184:         unparseputn(q, fd);
 185:     unparseputc((n%10) + '0', fd);
 186: }
 187: 
 188: unparseputc(c, fd)
 189: {
 190:     char    buf[1];
 191: 
 192:     buf[0] = c;
 193:     if (write(fd, buf, 1) != 1)
 194:         Panic("unparseputc: error writing character\n", 0);
 195: }

Defined functions

parseseq defined in line 11; used 2 times
unparseputc defined in line 188; used 12 times
unparseputn defined in line 177; used 2 times
unparseseq defined in line 145; used 8 times
Last modified: 1986-02-01
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