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135 lines
4.2 KiB
Bash
135 lines
4.2 KiB
Bash
#!/bin/sh
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# Execute a program, canonicalizing newlines in the standard output and/or
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# standard error.
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# Copyright (C) 2025-2026 Free Software Foundation, Inc.
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# Written by Bruno Haible <bruno@clisp.org>, 2025.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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# Usage: /bin/sh nlcanon.sh PLATFORMS STREAMS PROGRAM [ARGUMENTS]
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# where
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# PLATFORMS is one of
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# all for all platforms
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# windows-based for Cygwin and native Windows
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# windows for native Windows
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# STREAMS is one of
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# stdout for standard output
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# stderr for standard error
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# stdout,stderr for both standard output and standard error
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# PROGRAM [ARGUMENTS] is the command to execute.
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# func_tmpdir
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# creates a temporary directory.
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# Sets variable
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# - tmp pathname of freshly created temporary directory
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func_tmpdir ()
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{
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# Use the environment variable TMPDIR, falling back to /tmp. This allows
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# users to specify a different temporary directory, for example, if their
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# /tmp is filled up or too small.
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: "${TMPDIR=/tmp}"
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{
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# Use the mktemp program if available. If not available, hide the error
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# message.
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tmp=`(umask 077 && mktemp -d -q "$TMPDIR/gtXXXXXX") 2>/dev/null` &&
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test -n "$tmp" && test -d "$tmp"
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} ||
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{
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# Use a simple mkdir command. It is guaranteed to fail if the directory
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# already exists. $RANDOM is bash specific and expands to empty in shells
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# other than bash, ksh and zsh. Its use does not increase security;
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# rather, it minimizes the probability of failure in a very cluttered /tmp
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# directory.
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tmp=$TMPDIR/gt$$-$RANDOM
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(umask 077 && mkdir "$tmp")
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} ||
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{
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echo "$0: cannot create a temporary directory in $TMPDIR" >&2
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{ (exit 1); exit 1; }
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}
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}
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host_os='@host_os@'
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platforms="$1"
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streams="$2"
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shift
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shift
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case "$platforms" in
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all | windows-based | windows) ;;
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*) echo "nlcanon.sh: Invalid PLATFORMS argument" 1>&2; exit 1 ;;
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esac
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case "$streams" in
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stdout | stderr | stdout,stderr | stderr,stdout ) ;;
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*) echo "nlcanon.sh: Invalid STREAMS argument" 1>&2; exit 1 ;;
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esac
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if case "$platforms" in
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all)
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true
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;;
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windows-based)
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case "$host_os" in
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cygwin* | mingw* | windows*) true ;;
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*) false ;;
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esac
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;;
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windows)
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case "$host_os" in
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mingw* | windows*) true ;;
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*) false ;;
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esac
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;;
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esac
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then
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# We need a temporary file, to save the exit code.
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# Since there is no portable atomic 'mktemp' command, and since the only
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# safe non-atomic way to create a temporary file is in a temporary directory,
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# we need a temporary directory.
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func_tmpdir
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func_cleanup_tmpfiles()
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{
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rm -rf "$tmp"
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}
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trap func_cleanup_tmpfiles HUP INT QUIT PIPE TERM
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trap 'exit_status=$?; func_cleanup_tmpfiles; exit $exit_status' EXIT
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exitcode_file="$tmp/exit"
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# Need to use printf, because OpenBSD and Solaris 'sed' don't interpret \r
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# as an escape sequence.
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sed_convert_crlf='s/'`printf '\r'`'$//'
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# This is not a program. This is art. :D)
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case "$streams" in
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stdout)
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{ "$@"; echo "$?" > "$exitcode_file"; } | { sed -e "$sed_convert_crlf" 2>/dev/null; }
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;;
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stderr)
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{ { "$@" 2>&1 1>&3; echo "$?" > "$exitcode_file"; } | { sed -e "$sed_convert_crlf" 2>/dev/null; }; } 3>&1 1>&2
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;;
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*) # both
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{ { "$@" 2>&1 1>&3; echo "$?" > "$exitcode_file"; } | { sed -e "$sed_convert_crlf" 2>/dev/null; }; } 3>&1 1>&2 | { sed -e "$sed_convert_crlf" 2>/dev/null; }
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;;
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esac
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exit `cat "$exitcode_file"`
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else
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# No newline canonicalization is requested.
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exec "$@"
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fi
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