#!/bin/bash

srcdir=$1
outdir=$2
# 1 when the library was configured with a threading backend, 0 for
# -DAKERR_THREADS=none. Stamped into the header so a consumer cannot disagree
# with the library about whether it locks and whether its per-thread state is
# thread local. Defaults to 1 for a hand-run of this script.
thread_safe=${3:-1}

if [ "${thread_safe}" != "0" ] && [ "${thread_safe}" != "1" ]; then
    echo "$0: thread-safe argument must be 0 or 1, got '${thread_safe}'" >&2
    exit 1
fi

mkdir -p ${outdir}/src
mkdir -p ${outdir}/include
rm -f ${outdir}/src/errno.c
echo "#include <akerror.h>" >> ${outdir}/src/errno.c
echo "#include <errno.h>" >> ${outdir}/src/errno.c
cat >> ${outdir}/src/errno.c <<'EOF'

/*
 * These names belong to the library's own reserved band, and this runs from
 * akerr_init(), which has no caller to raise into -- so it goes through
 * __akerr_name_library_status(), which reports a refusal and terminates rather
 * than leaving every later stack trace to print "Unknown Error" for an errno.
 * Keeping the branch in src/error.c also keeps this generated file free of
 * control flow no test can reach.
 */
EOF
echo "void akerr_init_errno(void) {" >> ${outdir}/src/errno.c
maxval=$(errno --list | cut -d ' ' -f 2 | sort -g | tail -n 1)
errno --list | while read LINE; do
    define=$(echo "$LINE" | cut -d ' ' -f 1);
    value=$(echo "$LINE" | cut -d ' ' -f 2);
    desc=$(echo "$LINE" | cut -d ' ' -f 3-);
    echo "	__akerr_name_library_status(${define}, \"${desc}\");" >> ${outdir}/src/errno.c ;
done;
echo "}" >> ${outdir}/src/errno.c
sed -e "s/#define AKERR_LAST_ERRNO_VALUE .*/#define AKERR_LAST_ERRNO_VALUE      ${maxval}/" \
    -e "s/#define AKERR_THREAD_SAFE .*/#define AKERR_THREAD_SAFE           ${thread_safe}/" \
    ${srcdir}/include/akerror.tmpl.h > ${outdir}/include/akerror.h