parser.h revision 17987
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 3. All advertising materials mentioning features or use of this software 171556Srgrimes * must display the following acknowledgement: 181556Srgrimes * This product includes software developed by the University of 191556Srgrimes * California, Berkeley and its contributors. 201556Srgrimes * 4. Neither the name of the University nor the names of its contributors 211556Srgrimes * may be used to endorse or promote products derived from this software 221556Srgrimes * without specific prior written permission. 231556Srgrimes * 241556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341556Srgrimes * SUCH DAMAGE. 351556Srgrimes * 3617987Speter * @(#)parser.h 8.3 (Berkeley) 5/4/95 3717987Speter * $Id: parser.h,v 1.2 1994/09/24 02:58:09 davidg Exp $ 381556Srgrimes */ 391556Srgrimes 401556Srgrimes/* control characters in argument strings */ 411556Srgrimes#define CTLESC '\201' 421556Srgrimes#define CTLVAR '\202' 431556Srgrimes#define CTLENDVAR '\203' 441556Srgrimes#define CTLBACKQ '\204' 451556Srgrimes#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */ 461556Srgrimes/* CTLBACKQ | CTLQUOTE == '\205' */ 471556Srgrimes#define CTLARI '\206' 481556Srgrimes#define CTLENDARI '\207' 491556Srgrimes 501556Srgrimes/* variable substitution byte (follows CTLVAR) */ 5117987Speter#define VSTYPE 0x0f /* type of variable substitution */ 5217987Speter#define VSNUL 0x10 /* colon--treat the empty string as unset */ 5317987Speter#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */ 541556Srgrimes 551556Srgrimes/* values of VSTYPE field */ 5617987Speter#define VSNORMAL 0x1 /* normal variable: $var or ${var} */ 5717987Speter#define VSMINUS 0x2 /* ${var-text} */ 5817987Speter#define VSPLUS 0x3 /* ${var+text} */ 5917987Speter#define VSQUESTION 0x4 /* ${var?message} */ 6017987Speter#define VSASSIGN 0x5 /* ${var=text} */ 6117987Speter#define VSTRIMLEFT 0x6 /* ${var#pattern} */ 6217987Speter#define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */ 6317987Speter#define VSTRIMRIGHT 0x8 /* ${var%pattern} */ 6417987Speter#define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */ 6517987Speter#define VSLENGTH 0xa /* ${#var} */ 661556Srgrimes 671556Srgrimes 681556Srgrimes/* 691556Srgrimes * NEOF is returned by parsecmd when it encounters an end of file. It 701556Srgrimes * must be distinct from NULL, so we use the address of a variable that 711556Srgrimes * happens to be handy. 721556Srgrimes */ 731556Srgrimesextern int tokpushback; 741556Srgrimes#define NEOF ((union node *)&tokpushback) 751556Srgrimesextern int whichprompt; /* 1 == PS1, 2 == PS2 */ 761556Srgrimes 771556Srgrimes 7817987Speterunion node *parsecmd __P((int)); 7917987Spetervoid fixredir __P((union node *, const char *, int)); 8017987Speterint goodname __P((char *)); 8117987Speterchar *getprompt __P((void *)); 82