1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 35 /* control characters in argument strings */ 36 #define CTLESC '\300' 37 #define CTLVAR '\301' 38 #define CTLENDVAR '\371' 39 #define CTLBACKQ '\372' 40 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */ 41 /* CTLBACKQ | CTLQUOTE == '\373' */ 42 #define CTLARI '\374' 43 #define CTLENDARI '\375' 44 #define CTLQUOTEMARK '\376' 45 #define CTLQUOTEEND '\377' /* only for ${v+-...} */ 46 47 /* variable substitution byte (follows CTLVAR) */ 48 #define VSTYPE 0x0f /* type of variable substitution */ 49 #define VSNUL 0x10 /* colon--treat the empty string as unset */ 50 #define VSLINENO 0x20 /* expansion of $LINENO, the line number \ 51 follows immediately */ 52 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */ 53 54 /* values of VSTYPE field */ 55 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */ 56 #define VSMINUS 0x2 /* ${var-text} */ 57 #define VSPLUS 0x3 /* ${var+text} */ 58 #define VSQUESTION 0x4 /* ${var?message} */ 59 #define VSASSIGN 0x5 /* ${var=text} */ 60 #define VSTRIMLEFT 0x6 /* ${var#pattern} */ 61 #define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */ 62 #define VSTRIMRIGHT 0x8 /* ${var%pattern} */ 63 #define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */ 64 #define VSLENGTH 0xa /* ${#var} */ 65 #define VSERROR 0xb /* Syntax error, issue when expanded */ 66 67 68 /* 69 * NEOF is returned by parsecmd when it encounters an end of file. It 70 * must be distinct from NULL. 71 */ 72 #define NEOF ((union node *)-1) 73 extern int whichprompt; /* 1 == PS1, 2 == PS2 */ 74 extern const char *const parsekwd[]; 75 76 77 union node *parsecmd(int); 78 union node *parsewordexp(void); 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