# 2.11BSD#431 - /usr/src/lib/cpp/yylex.c

##### Functions

    tobinary          X
    yylex             X

##### Macros

    COFF              X
    IB                X
    isid              X

##### struct's

    symtab            X

       1: /* static char sccsid[] = "@(#)yylex.c	1.3 7/1/83"; */
       2:
       3: #define isid(a)  ((fastab+COFF)[a]&IB)
       4: #define IB 1
       5: /*	#if '\377' < 0		it would be nice if this worked properly!!!!! */
       6: #if pdp11 | vax | mc68000
       7: #define COFF 128
       8: #else
       9: #define COFF 0
      10: #endif
      11:
      12: yylex() {
      13:     static int ifdef=0;
      14:     static char *op2[]={"||",  "&&" , ">>", "<<", ">=", "<=", "!=", "=="};
      15:     static int  val2[]={OROR, ANDAND,  RS,   LS,   GE,   LE,   NE,   EQ};
      16:     static char *opc="b\bt\tn\nf\fr\r\\\\";
      17:     extern char fastab[];
      18:     extern char *outp,*inp,*newp; extern int flslvl;
      19:     register char savc, *s; char *skipbl(); int val;
      20:     register char **p2;
      21:     struct symtab {
      22:         char *name;
      23:         char *value;
      24:     } *sp, *lookup();
      25:
      26: for (;;) {
      27:     extern int passcom;     /* this crap makes #if's work */
      28:     int opt_passcom = passcom;  /* even with -C option */
      29:     passcom = 0;            /* (else comments make syntax errs) */
      30:     newp=skipbl(newp);
      31:     passcom = opt_passcom;      /* nb: lint uses -C so its useful! */
      32:     if (*inp=='\n') return(stop);   /* end of #if */
      33:     savc= *newp; *newp='\0';
      34:     for (p2=op2+8; --p2>=op2; ) /* check 2-char ops */
      35:         if (0==strcmp(*p2,inp)) {val=val2[p2-op2]; goto ret;}
      36:     s="+-*/%<>&^|?:!~(),";  /* check 1-char ops */
      37:     while (*s) if (*s++== *inp) {val= *--s; goto ret;}
      38:     if (*inp<='9' && *inp>='0') {/* a number */
      39:         if (*inp=='0') yylval= (inp[1]=='x' || inp[1]=='X') ?
      40:             tobinary(inp+2,16) : tobinary(inp+1,8);
      41:         else yylval=tobinary(inp,10);
      42:         val=number;
      43:     } else if (isid(*inp)) {
      44:         if (0==strcmp(inp,"defined")) {ifdef=1; ++flslvl; val=DEFINED;}
      45:         else {
      46:             sp=lookup(inp,-1); if (ifdef!=0) {ifdef=0; --flslvl;}
      47:             yylval= (sp->value==0) ? 0 : 1;
      48:             val=number;
      49:         }
      50:     } else  if (*inp=='\'') {/* character constant */
      51:         val=number;
      52:         if (inp[1]=='\\') {/* escaped */
      53:             char c; if (newp[-1]=='\'') newp[-1]='\0';
      54:             s=opc;
      55:             while (*s) if (*s++!=inp[2]) ++s; else {yylval= *s; goto ret;}
      56:             if (inp[2]<='9' && inp[2]>='0') yylval=c=tobinary(inp+2,8);
      57:             else yylval=inp[2];
      58:         } else yylval=inp[1];
      59:     } else if (0==strcmp("\\\n",inp)) {*newp=savc; continue;}
      60:     else {
      61:         *newp=savc; pperror("Illegal character %c in preprocessor if", *inp);
      62:         continue;
      63:     }
      64: ret:
      65:     *newp=savc; outp=inp=newp; return(val);
      66: }
      67: }
      68:
      69: tobinary(st, b) char *st; {
      70:     int n, c, t;
      71:     char *s;
      72:     n=0;
      73:     s=st;
      74:     while (c = *s++) {
      75:     switch(c) {
      76:         case '0': case '1': case '2': case '3': case '4':
      77:         case '5': case '6': case '7': case '8': case '9':
      78:             t = c-'0'; break;
      79:         case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
      80:             t = c-'a'+10; if (b>10) break;
      81:         case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
      82:             t = c - 'A'+10; if (b>10) break;
      83:         default:
      84:             t = -1;
      85:             if ( c=='l' || c=='L') if (*s=='\0') break;
      86:             pperror("Illegal number %s", st);
      87:     }
      88:     if (t<0) break;
      89:     n = n*b+t;
      90:     }
      91: return(n);
      92: }

#### Defined functions

tobinary defined in line 69; used 4 times

- in line 40-41(3), 56

yylex defined in line 12; never used

#### Defined struct's

symtab defined in line 21; never used

#### Defined macros

COFF defined in line 9; used 1 times

- in line 3

IB defined in line 4; used 1 times

- in line 3

isid defined in line 3; used 1 times

- in line 43

#### Usage of this include

yylex.c used 1 times

- in /usr/src/lib/cpp/cpy.y line 83

Last modified: 1991-08-07 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 902 |