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parser.h revision 1.16 
      1 /*	$NetBSD: parser.h,v 1.16 2003/08/07 09:05:37 agc 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)parser.h	8.3 (Berkeley) 5/4/95
     35  */
     36 
     37 /* control characters in argument strings */
     38 #define CTL_FIRST '\201'	/* first 'special' character */
     39 #define CTLESC '\201'		/* escape next character */
     40 #define CTLVAR '\202'		/* variable defn */
     41 #define CTLENDVAR '\203'
     42 #define CTLBACKQ '\204'
     43 #define CTLQUOTE 01		/* ored with CTLBACKQ code if in quotes */
     44 /*	CTLBACKQ | CTLQUOTE == '\205' */
     45 #define	CTLARI	'\206'		/* arithmetic expression */
     46 #define	CTLENDARI '\207'
     47 #define	CTLQUOTEMARK '\210'
     48 #define	CTL_LAST '\210'		/* last 'special' character */
     49 
     50 /* variable substitution byte (follows CTLVAR) */
     51 #define VSTYPE	0x0f		/* type of variable substitution */
     52 #define VSNUL	0x10		/* colon--treat the empty string as unset */
     53 #define VSQUOTE 0x80		/* inside double quotes--suppress splitting */
     54 
     55 /* values of VSTYPE field */
     56 #define VSNORMAL	0x1		/* normal variable:  $var or ${var} */
     57 #define VSMINUS		0x2		/* ${var-text} */
     58 #define VSPLUS		0x3		/* ${var+text} */
     59 #define VSQUESTION	0x4		/* ${var?message} */
     60 #define VSASSIGN	0x5		/* ${var=text} */
     61 #define VSTRIMLEFT	0x6		/* ${var#pattern} */
     62 #define VSTRIMLEFTMAX	0x7		/* ${var##pattern} */
     63 #define VSTRIMRIGHT	0x8		/* ${var%pattern} */
     64 #define VSTRIMRIGHTMAX 	0x9		/* ${var%%pattern} */
     65 #define VSLENGTH	0xa		/* ${#var} */
     66 
     67 
     68 /*
     69  * NEOF is returned by parsecmd when it encounters an end of file.  It
     70  * must be distinct from NULL, so we use the address of a variable that
     71  * happens to be handy.
     72  */
     73 extern int tokpushback;
     74 #define NEOF ((union node *)&tokpushback)
     75 extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
     76 
     77 
     78 union node *parsecmd(int);
     79 void fixredir(union node *, const char *, int);
     80 int goodname(char *);
     81 const char *getprompt(void *);
     82