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Annotation of 42BSD/ingres/source/equel/comment.c, revision 1.1

1.1     ! root        1: # include      <stdio.h>
        !             2: # include      "constants.h"
        !             3: # include      "globals.h"
        !             4: # include      <sccs.h>
        !             5: 
        !             6: SCCSID(@(#)comment.c   7.1     2/5/81)
        !             7: 
        !             8: 
        !             9: /*
        !            10: **  COMMENT.C -- routine to scan comments inside an equel statement
        !            11: **
        !            12: **     Uses the endcmnt token code to find the endcmnt
        !            13: **     terminal string, then reads the input until it sees this 
        !            14: **     terminal (must be <= 2 characters), returning EOF_TOK and
        !            15: **     giving an error diagnostic if end-of-file is encountered.
        !            16: **
        !            17: **     Parameters:
        !            18: **             none
        !            19: **
        !            20: **     Returns:
        !            21: **             CONTINUE -- valid comment
        !            22: **             EOF_TOK -- EOF in comment
        !            23: **
        !            24: **     Side Effects:
        !            25: **             deletes comments from within an equel statement
        !            26: */
        !            27: 
        !            28: 
        !            29: comment()
        !            30: {
        !            31:        register int            i, l;
        !            32:        register struct optab   *op;
        !            33:        char                    buf [3];
        !            34: 
        !            35:        /* find end of comment operator */
        !            36:        for (op = Optab; op->op_term; op++)
        !            37:                if (op->op_token == Tokens.sp_endcmnt)
        !            38:                        break;
        !            39: 
        !            40:        if (!op->op_term)
        !            41:                syserr("no end of comment operator in the parse tables");
        !            42:        /* scan for the end of comment */
        !            43:        l = length(op->op_term);
        !            44:        if (l > sizeof buf - 1)
        !            45:                syserr("comment : buf too short for endcmnt %s %d",
        !            46:                op->op_term, l);
        !            47: 
        !            48:        /* fill buffer to length of endmnt terminal */
        !            49:        for (i = 0; i < l; i++)         
        !            50:        {
        !            51:                if ((buf [i] = getch()) == EOF_TOK)
        !            52:                {
        !            53: nontermcom :
        !            54:                        /* non-terminated comment */
        !            55:                        yysemerr("premature EOF encountered in comment", 0);
        !            56:                        return (EOF_TOK);
        !            57:                }
        !            58:        }
        !            59: 
        !            60:        /* shift on input until endcmnt */
        !            61:        while (!bequal(buf, op->op_term, l))
        !            62:        {
        !            63:                for (i = 0; i < l - 1; i++)
        !            64:                        buf [i] = buf [i + 1];
        !            65:                if ((buf [l - 1] = getch()) == EOF_TOK)
        !            66:                        goto nontermcom;
        !            67:        }
        !            68:        return (CONTINUE);
        !            69: }

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