4dc6bdd3e7
Expand here documents at the same point other redirections are expanded but use a non-fork subshell environment (like simple command substitutions) for compatibility. Substitition errors result in an empty here document like before. As a result, a fork is avoided for short (<4K) expanded here documents. Unexpanded here documents (with quoted end marker after <<) are not affected by this change. They already only forked when >4K. Side effects: * Order of expansion is slightly different. * Slow expansions are not executed in parallel with the redirected command. * A non-fork subshell environment is subtly different from a forked process.
146 lines
5.1 KiB
Plaintext
146 lines
5.1 KiB
Plaintext
#-
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# Copyright (c) 1991, 1993
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# The Regents of the University of California. All rights reserved.
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#
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# This code is derived from software contributed to Berkeley by
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# Kenneth Almquist.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 4. Neither the name of the University nor the names of its contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# @(#)nodetypes 8.2 (Berkeley) 5/4/95
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# $FreeBSD$
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# This file describes the nodes used in parse trees. Unindented lines
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# contain a node type followed by a structure tag. Subsequent indented
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# lines specify the fields of the structure. Several node types can share
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# the same structure, in which case the fields of the structure should be
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# specified only once.
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#
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# A field of a structure is described by the name of the field followed
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# by a type. The currently implemented types are:
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# nodeptr - a pointer to a node
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# nodelist - a pointer to a list of nodes
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# string - a pointer to a nul terminated string
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# int - an integer
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# other - any type that can be copied by assignment
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# temp - a field that doesn't have to be copied when the node is copied
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# The last two types should be followed by the text of a C declaration for
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# the field.
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NSEMI nbinary # two commands separated by a semicolon
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type int
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ch1 nodeptr # the first child
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ch2 nodeptr # the second child
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NCMD ncmd # a simple command
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type int
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args nodeptr # the arguments
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redirect nodeptr # list of file redirections
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NPIPE npipe # a pipeline
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type int
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backgnd int # set to run pipeline in background
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cmdlist nodelist # the commands in the pipeline
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NREDIR nredir # redirection (of a compex command)
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type int
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n nodeptr # the command
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redirect nodeptr # list of file redirections
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NBACKGND nredir # run command in background
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NSUBSHELL nredir # run command in a subshell
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NAND nbinary # the && operator
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NOR nbinary # the || operator
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NIF nif # the if statement. Elif clauses are handled
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type int # using multiple if nodes.
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test nodeptr # if test
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ifpart nodeptr # then ifpart
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elsepart nodeptr # else elsepart
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NWHILE nbinary # the while statement. First child is the test
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NUNTIL nbinary # the until statement
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NFOR nfor # the for statement
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type int
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args nodeptr # for var in args
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body nodeptr # do body; done
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var string # the for variable
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NCASE ncase # a case statement
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type int
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expr nodeptr # the word to switch on
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cases nodeptr # the list of cases (NCLIST nodes)
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NCLIST nclist # a case ending with ;;
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type int
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next nodeptr # the next case in list
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pattern nodeptr # list of patterns for this case
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body nodeptr # code to execute for this case
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NCLISTFALLTHRU nclist # a case ending with ;&
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NDEFUN narg # define a function. The "next" field contains
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# the body of the function.
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NARG narg # represents a word
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type int
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next nodeptr # next word in list
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text string # the text of the word
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backquote nodelist # list of commands in back quotes
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NTO nfile # fd> fname
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NFROM nfile # fd< fname
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NFROMTO nfile # fd<> fname
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NAPPEND nfile # fd>> fname
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NCLOBBER nfile # fd>| fname
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type int
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next nodeptr # next redirection in list
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fd int # file descriptor being redirected
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fname nodeptr # file name, in a NARG node
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expfname temp char *expfname # actual file name
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NTOFD ndup # fd<&dupfd
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NFROMFD ndup # fd>&dupfd
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type int
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next nodeptr # next redirection in list
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fd int # file descriptor being redirected
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dupfd int # file descriptor to duplicate
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vname nodeptr # file name if fd>&$var
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NHERE nhere # fd<<\!
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NXHERE nhere # fd<<!
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type int
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next nodeptr # next redirection in list
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fd int # file descriptor being redirected
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doc nodeptr # input to command (NARG node)
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expdoc temp char *expdoc # actual document (for NXHERE)
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NNOT nnot # ! command (actually pipeline)
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type int
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com nodeptr
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