#- # Copyright (c) 1991, 1993 # The Regents of the University of California. All rights reserved. # # This code is derived from software contributed to Berkeley by # Kenneth Almquist. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions # are met: # 1. Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # 2. Redistributions in binary form must reproduce the above copyright # notice, this list of conditions and the following disclaimer in the # documentation and/or other materials provided with the distribution. # 4. Neither the name of the University nor the names of its contributors # may be used to endorse or promote products derived from this software # without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE # ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF # SUCH DAMAGE. # # @(#)nodetypes 8.2 (Berkeley) 5/4/95 # $FreeBSD: head/bin/sh/nodetypes 278820 2015-02-15 21:47:43Z jilles $ # This file describes the nodes used in parse trees. Unindented lines # contain a node type followed by a structure tag. Subsequent indented # lines specify the fields of the structure. Several node types can share # the same structure, in which case the fields of the structure should be # specified only once. # # A field of a structure is described by the name of the field followed # by a type. The currently implemented types are: # nodeptr - a pointer to a node # nodelist - a pointer to a list of nodes # string - a pointer to a nul terminated string # int - an integer # other - any type that can be copied by assignment # temp - a field that doesn't have to be copied when the node is copied # The last two types should be followed by the text of a C declaration for # the field. NSEMI nbinary # two commands separated by a semicolon type int ch1 nodeptr # the first child ch2 nodeptr # the second child NCMD ncmd # a simple command type int args nodeptr # the arguments redirect nodeptr # list of file redirections NPIPE npipe # a pipeline type int backgnd int # set to run pipeline in background cmdlist nodelist # the commands in the pipeline NREDIR nredir # redirection (of a compex command) type int n nodeptr # the command redirect nodeptr # list of file redirections NBACKGND nredir # run command in background NSUBSHELL nredir # run command in a subshell NAND nbinary # the && operator NOR nbinary # the || operator NIF nif # the if statement. Elif clauses are handled type int # using multiple if nodes. test nodeptr # if test ifpart nodeptr # then ifpart elsepart nodeptr # else elsepart NWHILE nbinary # the while statement. First child is the test NUNTIL nbinary # the until statement NFOR nfor # the for statement type int args nodeptr # for var in args body nodeptr # do body; done var string # the for variable NCASE ncase # a case statement type int expr nodeptr # the word to switch on cases nodeptr # the list of cases (NCLIST nodes) NCLIST nclist # a case ending with ;; type int next nodeptr # the next case in list pattern nodeptr # list of patterns for this case body nodeptr # code to execute for this case NCLISTFALLTHRU nclist # a case ending with ;& NDEFUN narg # define a function. The "next" field contains # the body of the function. NARG narg # represents a word type int next nodeptr # next word in list text string # the text of the word backquote nodelist # list of commands in back quotes NTO nfile # fd> fname NFROM nfile # fd< fname NFROMTO nfile # fd<> fname NAPPEND nfile # fd>> fname NCLOBBER nfile # fd>| fname type int fd int # file descriptor being redirected next nodeptr # next redirection in list fname nodeptr # file name, in a NARG node expfname temp char *expfname # actual file name NTOFD ndup # fd<&dupfd NFROMFD ndup # fd>&dupfd type int fd int # file descriptor being redirected next nodeptr # next redirection in list dupfd int # file descriptor to duplicate vname nodeptr # file name if fd>&$var NHERE nhere # fd<<\! NXHERE nhere # fd<