1: # include   <stdio.h>
   2: # include   "constants.h"
   3: # include   "globals.h"
   4: # include   "y.tab.h"
   5: # include   <sccs.h>
   6: 
   7: SCCSID(@(#)string.c	8.1	12/31/84)
   8: 
   9: 
  10: /*
  11: **  STRING -- processes a string constant
  12: **	Strings are kept internally exactly as their external
  13: **	appearance, except for the outermost '"'.
  14: **	A string may be at most MAXSTRING characters
  15: **	long, and may have escaped newlines.
  16: **
  17: **	Parameters:
  18: **		op -- pointer to string quote operator
  19: **			table entry.
  20: **
  21: **	Returns:
  22: **		SCONST
  23: */
  24: 
  25: 
  26: string(op)
  27: struct optab    *op;
  28: {
  29:     char        buf [MAXSTRING + 1];
  30:     register char   c, *cp;
  31:     int     error;
  32:     register int    escape;
  33: 
  34:     error = escape = 0;
  35:     cp = buf;
  36:     for ( ; ; )
  37:     {
  38:         c = getch();
  39:         switch (c)
  40:         {
  41: 
  42:           case '\\' :
  43:             if (!escape)
  44:                 escape = 2;
  45:             goto regchar;
  46: 
  47:           case '\n' :
  48:             if (escape)
  49:                 goto regchar;
  50:             *cp = '\0';
  51:             yysemerr("non-terminated string",
  52:               !error ? buf : 0);
  53:             break;
  54: 
  55:           case EOF_TOK :
  56:             backup(c);
  57:             *cp = '\0';
  58:             yysemerr("EOF in string",
  59:               !error ? buf : 0);
  60:             break;
  61: 
  62:           default :
  63: regchar :
  64:             if (c == *op->op_term && !escape)
  65:             {
  66:                 /* end of string */
  67:                 *cp = '\0';
  68:                 break;
  69:             }
  70:             if (!error)
  71:             {
  72:                 if (cp - buf < MAXSTRING)
  73:                 {
  74:                     if (Cmap [c] == CNTRL)
  75:                         yysemerr("control character in string eliminated",
  76:                         0);
  77:                     else
  78:                         *cp++ = c;
  79:                 }
  80:                 else
  81:                 {
  82:                     yysemerr("string too long, rest discarded",
  83:                     0);
  84:                     error = 1;
  85:                 }
  86:             }
  87:             if (escape)
  88:                 --escape;
  89:             continue;
  90:         }
  91:         break;
  92:     }
  93:     yylval.u_dn = addsym(salloc(buf));
  94:     return (Tokens.sp_sconst);
  95: }

Defined functions

string defined in line 7; used 1 times
Last modified: 1986-04-17
Generated: 2016-12-26
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