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exists() # checks executables listed in $@ against the $PATH
{
v=1
while [ "$#" -gt 0 ]; do
arg="$1"
shift 1
case "$arg" in ''|*/) continue ;; esac
x="${arg##*/}"
z="${arg%/*}"
[ ! -f "$z/$x" ] || [ ! -x "$z/$x" ] && [ "$z/$x" = "$arg" ] && continue
[ "$x" = "$z" ] && [ -x "$z/$x" ] && [ ! -f "$arg" ] && z=
p=":$z:$PATH"
while [ "$p" != "${p#*:}" ]; do
p="${p#*:}"
d="${p%%:*}"
{ [ -f "$d/$x" ] && [ -x "$d/$x" ] && \
{ printf %s\\n "$d/$x"; v=0; break; }; } || :
done
done
return "$v"
}
if [ -n "$CROSS_COMPILE" ]; then
case "$CROSS_COMPILE" in
*'-mingw32'*) OS='Win32';;
*'-msdosdjgpp'*) OS='DOS';;
*);;
esac
fi
if [ -z "$CROSS_COMPILE" ] || [ -z "$OS" ]; then
case "$(uname)" in
'Linux') OS='Linux';;
*'BSD') OS='BSD';;
'Darwin') OS='Darwin';;
'CYGWIN'*) OS='Cygwin';;
'Haiku') OS='Haiku';;
'MINGW'*) OS='Win32';;
'SunOS') OS='SunOS';;
*) OS="Win32";;
esac
fi
DISTRO=''
if [ -e /etc/lsb-release ]; then
. /etc/lsb-release
DISTRO="(${DISTRIB_DESCRIPTION} ${DISTRIB_RELEASE})"
fi
echo "Checking operating system ... $OS ${DISTRO}"
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