4.3BSD - /usr/src/new/mh/zotnet/tws/lexstring.c

   1: #include <stdio.h>
   2: #include <ctype.h>
   3: 
   4: #define YYLERR yysvec
   5: #define YYTYPE int
   6: #define YYLMAX 256
   7: 
   8: struct yysvf {
   9:     struct yywork *yystoff;
  10:     struct yysvf *yyother;
  11:     int *yystops;
  12: };
  13: 
  14: struct yywork {
  15:     YYTYPE  verify;
  16:     YYTYPE  advance;
  17: };
  18: 
  19: extern int yyvstop[];
  20: extern struct yywork yycrank[];
  21: extern struct yysvf yysvec[];
  22: extern char yymatch[];
  23: extern char yyextra[];
  24: 
  25: #ifdef ONECASE
  26: static char case_map[] = {
  27:      0,   1,   2,   3,   4,   5,   6,   7,   8,   9,
  28:     10,  11,  12,  13,  14,  15,  16,  17,  18,  19,
  29:     20,  21,  22,  23,  24,  25,  26,  27,  28,  29,
  30:     30,  31,  32,  33,  34,  35,  36,  37,  38,  39,
  31:     40,  41,  42,  43,  44,  45,  46,  47,  48,  49,
  32:     50,  51,  52,  53,  54,  55,  56,  57,  58,  59,
  33:     60,  61,  62,  63,  64,  97,  98,  99, 100, 101,
  34:    102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
  35:    112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
  36:    122,  91,  92,  93,  94,  95,  96,  97,  98,  99,
  37:    100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
  38:    110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
  39:    120, 121, 122, 123, 124, 125, 126, 127,
  40:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  41:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  42:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  43:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  44:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  45:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  46:    0, 0, 0, 0, 0, 0, 0, 0
  47: };
  48: #endif ONECASE
  49: 
  50: 
  51: lex_string( strptr, start_cond)
  52:     char    **strptr;
  53:     int start_cond;
  54: {
  55:     register struct yysvf *state, **lsp;
  56:     register struct yywork *tran;
  57:     register int statenum;
  58:     register int ch;
  59:     register char   *cp = *strptr;
  60:     register int    *found;
  61:     struct  yysvf *yylstate[YYLMAX];
  62: 
  63:     /* start off machines */
  64:     lsp = yylstate;
  65:     statenum = 1 + start_cond;
  66:     state = yysvec + statenum;
  67:     for (;;){
  68: # ifdef LEXDEBUG
  69:         fprintf(stdout,"%d ",statenum - 1);
  70: # endif
  71:         tran = state->yystoff;
  72:         if(tran == yycrank)
  73:             /* may not be any transitions */
  74:             if (state->yyother == 0 ||
  75:                 state->yyother->yystoff == yycrank)
  76:                 break;
  77: 
  78: #ifdef ONECASE
  79:         ch = case_map[*cp++];
  80: #else  not ONECASE
  81:         ch = *cp++;
  82: #endif ONECASE
  83: # ifdef LEXDEBUG
  84:         fprintf(stdout,"(");
  85:         allprint(ch);
  86:         fprintf(stdout, ")");
  87: # endif
  88: tryagain:
  89:         if ( tran > yycrank){
  90:             tran += ch;
  91:             if (tran->verify == statenum){
  92:                 if ((statenum = tran->advance) == 0){
  93:                     /* error transitions */
  94:                     --cp;
  95:                     break;
  96:                 }
  97:                 state = statenum + yysvec;
  98:                 *lsp++ = state;
  99:                 goto contin;
 100:             }
 101: 
 102:         } else if(tran < yycrank) {
 103:             tran = yycrank+(yycrank-tran) + ch;
 104: # ifdef LEXDEBUG
 105:             fprintf(stdout," compressed");
 106: # endif
 107:             if (tran->verify == statenum){
 108:                 if ((statenum = tran->advance) == 0)
 109:                     /* error transitions */
 110:                     break;
 111: 
 112:                 state = statenum + yysvec;
 113:                 *lsp++ = state;
 114:                 goto contin;
 115:             }
 116:             tran += (yymatch[ch] - ch);
 117: # ifdef LEXDEBUG
 118:             fprintf(stdout,"(fb ");
 119:             allprint(yymatch[ch]);
 120:             fprintf(stdout,")");
 121: # endif
 122:             if (tran->verify == statenum){
 123:                 if((statenum = tran->advance) == 0)
 124:                     /* error transition */
 125:                     break;
 126: 
 127:                 state = statenum + yysvec;
 128:                 *lsp++ = state;
 129:                 goto contin;
 130:             }
 131:         }
 132:         if ((state = state->yyother) &&
 133:             (tran = state->yystoff) != yycrank){
 134:             statenum = state - yysvec;
 135: # ifdef LEXDEBUG
 136:             fprintf(stdout,"fb %d",
 137:                 statenum - 1);
 138: # endif
 139:             goto tryagain;
 140:         } else
 141:             break;
 142: 
 143: contin:
 144: # ifdef LEXDEBUG
 145:         fprintf(stdout,">");
 146: # endif
 147:         ;
 148:     }
 149: # ifdef LEXDEBUG
 150:     fprintf(stdout,"\nStopped in state %d (",*(lsp-1)-yysvec-1);
 151:     allprint(ch);
 152:     fprintf(stdout, ") ");
 153: # endif
 154:     while (lsp-- > yylstate){
 155:         if (*lsp != 0 && (found= (*lsp)->yystops) && *found > 0){
 156:             if(yyextra[*found]){
 157:                 /* must backup */
 158:                 ch = -*found;
 159:                 do {
 160:                     while (*found && *found++ != ch)
 161:                         ;
 162:                  } while (lsp > yylstate &&
 163:                       (found = (*--lsp)->yystops));
 164:             }
 165: # ifdef LEXDEBUG
 166:             fprintf(stdout," Match \"");
 167:             for ( cp = *strptr;
 168:                   cp <= ((*strptr)+(lsp-yylstate));
 169:                   cp++)
 170:                 allprint( *cp );
 171:             fprintf(stdout,"\" action %d\n",*found);
 172: # endif
 173:             *strptr += (lsp - yylstate + 1);
 174:             return(*found);
 175:         }
 176:     }
 177:     /* the string didn't match anything - if we're looking at
 178: 	 * eos, just return 0.  Otherwise, bump the string pointer
 179: 	 * and return -1.
 180: 	 */
 181: # ifdef LEXDEBUG
 182:     fprintf(stdout," No match\n");
 183: #endif LEXDEBUG
 184:     if ( **strptr ) {
 185:         (*strptr)++;
 186:         return (-1);
 187:     }
 188:     return (0);
 189: }
 190: 
 191: #ifdef LEXDEBUG
 192: allprint(c)
 193:     char c;
 194: {
 195:     if ( c < 32 ) {
 196:         putc( '^', stdout );
 197:         c += 32;
 198:     } else if ( c == 127 ) {
 199:         putc( '^', stdout );
 200:         c = '?';
 201:     }
 202:     putc( c, stdout );
 203: }
 204: #endif LEXDEBUG

Defined functions

Defined variables

Defined struct's

Defined macros