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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)parser.h 8.3 (Berkeley) 5/4/95 33 * $FreeBSD$ 34 */ 35 36 /* control characters in argument strings */ 37 #define CTLESC '\300' 38 #define CTLVAR '\301' 39 #define CTLENDVAR '\371' 40 #define CTLBACKQ '\372' 41 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */ 42 /* CTLBACKQ | CTLQUOTE == '\373' */ 43 #define CTLARI '\374' 44 #define CTLENDARI '\375' 45 #define CTLQUOTEMARK '\376' 46 #define CTLQUOTEEND '\377' /* only for ${v+-...} */ 47 48 /* variable substitution byte (follows CTLVAR) */ 49 #define VSTYPE 0x0f /* type of variable substitution */ 50 #define VSNUL 0x10 /* colon--treat the empty string as unset */ 51 #define VSLINENO 0x20 /* expansion of $LINENO, the line number \ 52 follows immediately */ 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 #define VSERROR 0xb /* Syntax error, issue when expanded */ 67 68 69 /* 70 * NEOF is returned by parsecmd when it encounters an end of file. It 71 * must be distinct from NULL. 72 */ 73 #define NEOF ((union node *)-1) 74 extern int whichprompt; /* 1 == PS1, 2 == PS2 */ 75 extern const char *const parsekwd[]; 76 77 78 union node *parsecmd(int); 79 void forcealias(void); 80 void fixredir(union node *, const char *, int); 81 int goodname(const char *); 82 int isassignment(const char *); 83 char *getprompt(void *); 84 const char *expandstr(const char *); 85