#! /bin/sh
#
# RTEMS Tools Project (http://www.rtems.org/)
# Copyright 2018 Chris Johns (chrisj@rtems.org)
# All rights reserved.
#
# This file is part of the RTEMS Tools package in 'rtems-tools'.
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

#
# Host Build Dependence
#
# This script finds a file that is part of the compiler's default
# build environment. The file can be header or a library.
#
# Header files:
#  - Get the list of include directories from the compiler.
#  - Search the include paths for the header file.
#
# Library:
#  - Ask the compiler to print the library paths, add on any user
#    paths and search with a wilecard.
#

set -e

op=
name=
includes=
libraries=
compile=
verbose=no
debug=no

if [ $# -eq 0 ]; then
    echo 'Usage: rtems-build-dep [-c compiler] [-H header] [-I header-paths]
                       [-l library] [-L library-paths] [-v] [-d]'
    exit 2
fi
while [ $# -gt 0 ]
do
    case "$1"
    in
	-c)
	    if [ $# -eq 1 ]; then
		echo 'error: no compiler (-c) provided'
		exit 2
	    fi
	    compiler="$2"; shift;
            shift;;
	-H)
	    if [ $# -eq 1 ]; then
		echo 'error: no header (-H) provided'
		exit 2
	    fi
	    op="header"
            name="$2"; shift;
            shift;;
	-I)
	    if [ $# -eq 1 ]; then
		echo 'error: no header path (-I) provided'
		exit 2
	    fi
            includes="${includes} $2"; shift;
            shift;;
	-l)
	    if [ $# -eq 1 ]; then
		echo 'error: no library (-l) provided'
		exit 2
	    fi
	    op="library"
            name="$2"; shift;
            shift;;
	-L)
	    if [ $# -eq 1 ]; then
		echo 'error: no library path (-L) provided'
		exit 2
	    fi
            libraries="$2"; shift;
            shift;;
	-v)
	    verbose=yes
            shift;;
	-d)
	    debug=yes
            shift;;
	*)
	    break;
    esac
done

if [ ${debug} = yes ]; then
    set -x
fi

if [ -z "${op}" ]; then
    echo "error: no header or library file to find found."
    exit 2
fi
if [ -z "${compiler}" ]; then
    echo "error: no compiler provided."
    exit 2
fi
if [ -z "${name}" ]; then
    echo "error: no name found."
    exit 2
fi

#
# Header file.
#
if [ ${op} = "header" ]; then
    inc_paths=$(echo | LC_ALL=C ${compiler} ${includes} -xc -E -v - 2>&1 | tr -d '\r' | \
	       awk 'BEGIN {flag=0;} /starts here/{flag=1;next}/End/{flag=0}flag')
    for p in ${inc_paths}
    do
	if [ ${verbose} = yes ]; then
	    echo "Include: ${p}"
	fi
	if [ -f "${p}/${name}" ]; then
	    echo "found"
	    exit 0
	fi
    done
    echo "not-found"
    exit 0
fi

#
# Library file
#
if [ ${op} = "library" ]; then
    if [ "${OS}" = "Windows_NT" -a "${OSTYPE}" != "cygwin" ]; then
	sep=';'
    else
	sep=':'
    fi
    lib_paths_1=$(LC_ALL=C ${compiler} -print-search-dirs 2>&1 | tr -d '\r' | \
		      grep libraries | \
		      sed -e 's/libraries:.*=//' | \
		      awk 'BEGIN {FS="'${sep}'"} {for (i=0;++i<=NF;) print $i;}')
    lib_paths_2=$(echo ${libraries} | \
		      awk 'BEGIN {FS="-L"} {for (i=0;++i<=NF;) if (length($i) > 0) print $i;}')
    for p in ${lib_paths_1} ${lib_paths_2}
    do
	if [ ${verbose} = yes ]; then
	    echo "Library: ${p}/${name}"
	fi
	if ls ${p}/${name} 1> /dev/null 2>&1; then
	    echo "found"
	    exit 0
	fi
    done
    echo "not-found"
    exit 0
fi

exit 1