Initial import from FreeBSD RELENG_4:
[dragonfly.git] / bin / sh / nodetypes
CommitLineData
984263bc
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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# @(#)nodetypes 8.2 (Berkeley) 5/4/95
37# $FreeBSD: src/bin/sh/nodetypes,v 1.6.2.2 2002/07/19 04:38:52 tjr Exp $
38
39# This file describes the nodes used in parse trees. Unindented lines
40# contain a node type followed by a structure tag. Subsequent indented
41# lines specify the fields of the structure. Several node types can share
42# the same structure, in which case the fields of the structure should be
43# specified only once.
44#
45# A field of a structure is described by the name of the field followed
46# by a type. The currently implemented types are:
47# nodeptr - a pointer to a node
48# nodelist - a pointer to a list of nodes
49# string - a pointer to a nul terminated string
50# int - an integer
51# other - any type that can be copied by assignment
52# temp - a field that doesn't have to be copied when the node is copied
53# The last two types should be followed by the text of a C declaration for
54# the field.
55
56NSEMI nbinary # two commands separated by a semicolon
57 type int
58 ch1 nodeptr # the first child
59 ch2 nodeptr # the second child
60
61NCMD ncmd # a simple command
62 type int
63 backgnd int # set to run command in background
64 args nodeptr # the arguments
65 redirect nodeptr # list of file redirections
66
67NPIPE npipe # a pipeline
68 type int
69 backgnd int # set to run pipeline in background
70 cmdlist nodelist # the commands in the pipeline
71
72NREDIR nredir # redirection (of a compex command)
73 type int
74 n nodeptr # the command
75 redirect nodeptr # list of file redirections
76
77NBACKGND nredir # run command in background
78NSUBSHELL nredir # run command in a subshell
79
80NAND nbinary # the && operator
81NOR nbinary # the || operator
82
83NIF nif # the if statement. Elif clauses are handled
84 type int # using multiple if nodes.
85 test nodeptr # if test
86 ifpart nodeptr # then ifpart
87 elsepart nodeptr # else elsepart
88
89NWHILE nbinary # the while statement. First child is the test
90NUNTIL nbinary # the until statement
91
92NFOR nfor # the for statement
93 type int
94 args nodeptr # for var in args
95 body nodeptr # do body; done
96 var string # the for variable
97
98NCASE ncase # a case statement
99 type int
100 expr nodeptr # the word to switch on
101 cases nodeptr # the list of cases (NCLIST nodes)
102
103NCLIST nclist # a case
104 type int
105 next nodeptr # the next case in list
106 pattern nodeptr # list of patterns for this case
107 body nodeptr # code to execute for this case
108
109
110NDEFUN narg # define a function. The "next" field contains
111 # the body of the function.
112
113NARG narg # represents a word
114 type int
115 next nodeptr # next word in list
116 text string # the text of the word
117 backquote nodelist # list of commands in back quotes
118
119NTO nfile # fd> fname
120NFROM nfile # fd< fname
121NFROMTO nfile # fd<> fname
122NAPPEND nfile # fd>> fname
123NCLOBBER nfile # fd>| fname
124 type int
125 next nodeptr # next redirection in list
126 fd int # file descriptor being redirected
127 fname nodeptr # file name, in a NARG node
128 expfname temp char *expfname # actual file name
129
130NTOFD ndup # fd<&dupfd
131NFROMFD ndup # fd>&dupfd
132 type int
133 next nodeptr # next redirection in list
134 fd int # file descriptor being redirected
135 dupfd int # file descriptor to duplicate
136 vname nodeptr # file name if fd>&$var
137
138
139NHERE nhere # fd<<\!
140NXHERE nhere # fd<<!
141 type int
142 next nodeptr # next redirection in list
143 fd int # file descriptor being redirected
144 doc nodeptr # input to command (NARG node)
145
146NNOT nnot # ! command (actually pipeline)
147 type int
148 com nodeptr