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.
64 lines
2.4 KiB
C
64 lines
2.4 KiB
C
/*-
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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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* @(#)expand.h 8.2 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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struct strlist {
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struct strlist *next;
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char *text;
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};
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struct arglist {
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struct strlist *list;
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struct strlist **lastp;
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};
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/*
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* expandarg() flags
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*/
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#define EXP_FULL 0x1 /* perform word splitting & file globbing */
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#define EXP_TILDE 0x2 /* do normal tilde expansion */
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#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
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#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
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#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
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#define EXP_SPLIT_LIT 0x20 /* IFS split literal text ${v+-a b c} */
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#define EXP_LIT_QUOTED 0x40 /* for EXP_SPLIT_LIT, start off quoted */
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union node;
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void expandarg(union node *, struct arglist *, int);
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void expari(int);
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void rmescapes(char *);
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int casematch(union node *, const char *);
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