1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1997-2005
5 * Herbert Xu <herbert@gondor.apana.org.au>. 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 #include "token.h"
38
39 /* control characters in argument strings */
40 #define CTL_FIRST -127 /* first 'special' character */
41 #define CTLESC -127 /* escape next character */
42 #define CTLVAR -126 /* variable defn */
43 #define CTLENDVAR -125
44 #define CTLBACKQ -124
45 #define CTLARI -122 /* arithmetic expression */
46 #define CTLENDARI -121
47 #define CTLQUOTEMARK -120
48 #define CTL_LAST -120 /* 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
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 VSTRIMRIGHT 0x6 /* ${var%pattern} */
61 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
62 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
63 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
64 #define VSLENGTH 0xa /* ${#var} */
65
66 /* values of checkkwd variable */
67 #define CHKALIAS 0x1
68 #define CHKKWD 0x2
69 #define CHKNL 0x4
70 #define CHKEOFMARK 0x8
71
72
73 /*
74 * NEOF is returned by parsecmd when it encounters an end of file. It
75 * must be distinct from NULL, so we use the address of a variable that
76 * happens to be handy.
77 */
78 extern int lasttoken;
79 extern int tokpushback;
80 #define NEOF ((union node *)&tokpushback)
81 extern int whichprompt; /* 1 == PS1, 2 == PS2 */
82 extern int checkkwd;
83
84
85 union node *parsecmd(int);
86 void fixredir(union node *, const char *, int);
87 const char *getprompt(void *);
88 const char *const *findkwd(const char *);
89 char *endofname(const char *);
90 const char *expandstr(const char *);
91
92 static inline int
goodname(const char * p)93 goodname(const char *p)
94 {
95 return !*endofname(p);
96 }
97
parser_eof(void)98 static inline int parser_eof(void)
99 {
100 return tokpushback && lasttoken == TEOF;
101 }
102