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parser.h revision 1.12 
      1 /*	$NetBSD: parser.h,v 1.12 1999/01/25 14:20:56 mycroft Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Kenneth Almquist.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)parser.h	8.3 (Berkeley) 5/4/95
     39  */
     40 
     41 /* control characters in argument strings */
     42 #define CTLESC '\201'
     43 #define CTLVAR '\202'
     44 #define CTLENDVAR '\203'
     45 #define CTLBACKQ '\204'
     46 #define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
     47 /*	CTLBACKQ | CTLQUOTE == '\205' */
     48 #define	CTLARI	'\206'
     49 #define	CTLENDARI '\207'
     50 #define	CTLQUOTEMARK '\210'
     51 
     52 /* variable substitution byte (follows CTLVAR) */
     53 #define VSTYPE	0x0f		/* type of variable substitution */
     54 #define VSNUL	0x10		/* colon--treat the empty string as unset */
     55 #define VSQUOTE 0x80		/* inside double quotes--suppress splitting */
     56 
     57 /* values of VSTYPE field */
     58 #define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
     59 #define VSMINUS		0x2		/* ${var-text} */
     60 #define VSPLUS		0x3		/* ${var+text} */
     61 #define VSQUESTION	0x4		/* ${var?message} */
     62 #define VSASSIGN	0x5		/* ${var=text} */
     63 #define VSTRIMLEFT	0x6		/* ${var#pattern} */
     64 #define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
     65 #define VSTRIMRIGHT	0x8		/* ${var%pattern} */
     66 #define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
     67 #define VSLENGTH	0xa		/* ${#var} */
     68 
     69 
     70 /*
     71  * NEOF is returned by parsecmd when it encounters an end of file.  It
     72  * must be distinct from NULL, so we use the address of a variable that
     73  * happens to be handy.
     74  */
     75 extern int tokpushback;
     76 #define NEOF ((union node *)&tokpushback)
     77 extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
     78 
     79 
     80 union node *parsecmd __P((int));
     81 void fixredir __P((union node *, const char *, int));
     82 int goodname __P((char *));
     83 char *getprompt __P((void *));
     84