2.11BSD#431 - /usr/ingres/source/scanner/string.c

   1: # include "../ingres.h"
   2: # include "../scanner.h"
   3: 
   4: /*
   5: ** STRING
   6: ** A string is defined as any sequence of MAXSTRING or fewer characters,
   7: ** surrounded by string delimiters.  New-line ;characters are purged
   8: ** from strings unless preceeded by a '\'; QUOTE's must be similarly
   9: ** prefixed in order to be correctly inserted within a string.  Each
  10: ** string is entered in the symbol table, indexed by 'yylval'.  A
  11: ** token or the error condition -1 is returned.
  12: */
  13: string(op)
  14: struct optab    *op;
  15: {
  16:     extern char Cmap[];
  17:     extern char *yylval;
  18:     register int    esc;
  19:     register int    save;
  20:     register char   *ptr;
  21:     char        buf[MAXSTRING + 1];
  22:     char        *syment();
  23: 
  24:     /* disable case conversion and fill in string */
  25:     ptr = buf;
  26:     save = Lcase;
  27:     Lcase = 0;
  28:     do
  29:     {
  30:         /* get next character */
  31:         if ((*ptr = gtchar()) <= 0)
  32:         {
  33:             Lcase = save;
  34:             /* non term string */
  35:             yyerror(STRTERM, 0);
  36:         }
  37: 
  38:         /* handle escape characters */
  39:         esc = (*ptr == '\\');
  40:         if (*ptr == '\n')
  41:         {
  42:             if ((*ptr = gtchar()) <= 0)
  43:             {
  44:                 Lcase = save;
  45:                 *ptr = 0;
  46:                 /* non term string */
  47:                 yyerror(STRTERM, 0);
  48:             }
  49:         }
  50:         if (esc == 1)
  51:         {
  52:             if ((*++ptr = gtchar()) <= 0)
  53:             {
  54:                 Lcase = save;
  55:                 *ptr = 0;
  56:                 /* non term string */
  57:                 yyerror(STRTERM, 0);
  58:             }
  59:             if (*ptr == *(op->term))
  60:                 *--ptr = *(op->term);
  61:         }
  62: 
  63:         /* check length */
  64:         if ((ptr - buf) > MAXSTRING - 1)
  65:         {
  66:             Lcase = save;
  67:             /* string too long */
  68:             yyerror(STRLONG, 0);
  69:         }
  70:         if (Cmap[*ptr] == CNTRL)
  71:             /* cntrl in string from equel */
  72:             yyerror(CNTRLCHR, 0);
  73:     } while (*ptr++ != *(op->term) || esc == 1);
  74: 
  75:     /* restore case conversion and return */
  76:     *--ptr = '\0';
  77:     Lcase = save;
  78: #	ifdef xSTR2
  79:     tTfp(71, 8, "STRING: %s\n", buf);
  80: #	endif
  81:     yylval = syment(buf, (ptr - buf) + 1);
  82:     Lastok.tok = yylval;
  83:     Lastok.toktyp = Tokens.sconst;
  84:     return (Tokens.sconst);
  85: }

Defined functions