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parser.h revision 1.5 
      1 /*-
      2  * Copyright (c) 1991, 1993
      3  *	The Regents of the University of California.  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	8.1 (Berkeley) 5/31/93
     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 /*	CTLBACKQ | CTLQUOTE == '\205' */
     46 #define	CTLARI	'\206'
     47 #define	CTLENDARI '\207'
     48 
     49 /* variable substitution byte (follows CTLVAR) */
     50 #define VSTYPE 07		/* type of variable substitution */
     51 #define VSNUL 040		/* colon--treat the empty string as unset */
     52 #define VSQUOTE 0100		/* inside double quotes--suppress splitting */
     53 
     54 /* values of VSTYPE field */
     55 #define VSNORMAL 1		/* normal variable:  $var or ${var} */
     56 #define VSMINUS 2		/* ${var-text} */
     57 #define VSPLUS 3		/* ${var+text} */
     58 #define VSQUESTION 4		/* ${var?message} */
     59 #define VSASSIGN 5		/* ${var=text} */
     60 
     61 
     62 /*
     63  * NEOF is returned by parsecmd when it encounters an end of file.  It
     64  * must be distinct from NULL, so we use the address of a variable that
     65  * happens to be handy.
     66  */
     67 extern int tokpushback;
     68 #define NEOF ((union node *)&tokpushback)
     69 extern int whichprompt;		/* 1 == PS1, 2 == PS2 */
     70 
     71 
     72 #ifdef __STDC__
     73 union node *parsecmd(int);
     74 int goodname(char *);
     75 char *getprompt(void *);
     76 #else
     77 union node *parsecmd();
     78 int goodname();
     79 char *getprompt();
     80 #endif
     81