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parser.h revision 1.1 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Kenneth Almquist.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	@(#)parser.h	5.1 (Berkeley) 3/7/91
     37  */
     38 
     39 /* control characters in argument strings */
     40 #define CTLESC '\201'
     41 #define CTLVAR '\202'
     42 #define CTLENDVAR '\203'
     43 #define CTLBACKQ '\204'
     44 #define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
     45 
     46 /* variable substitution byte (follows CTLVAR) */
     47 #define VSTYPE 07		/* type of variable substitution */
     48 #define VSNUL 040		/* colon--treat the empty string as unset */
     49 #define VSQUOTE 0100		/* inside double quotes--suppress splitting */
     50 
     51 /* values of VSTYPE field */
     52 #define VSNORMAL 1		/* normal variable:  $var or ${var} */
     53 #define VSMINUS 2		/* ${var-text} */
     54 #define VSPLUS 3		/* ${var+text} */
     55 #define VSQUESTION 4		/* ${var?message} */
     56 #define VSASSIGN 5		/* ${var=text} */
     57 
     58 
     59 /*
     60  * NEOF is returned by parsecmd when it encounters an end of file.  It
     61  * must be distinct from NULL, so we use the address of a variable that
     62  * happens to be handy.
     63  */
     64 extern int tokpushback;
     65 #define NEOF ((union node *)&tokpushback)
     66 
     67 
     68 #ifdef __STDC__
     69 union node *parsecmd(int);
     70 int goodname(char *);
     71 #else
     72 union node *parsecmd();
     73 int goodname();
     74 #endif
     75