gint/configure

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#! /bin/bash
declare -A conf
conf[ATEXIT_MAX]=16
conf[RTC_CB_ARRAY_SIZE]=5
conf[EVENTS_QUEUE_SIZE]=64
conf[GINT_NO_SYSCALLS]=
fail=false
output="gcc.cfg"
help()
{
cat << EOF
Configuration script for the gint library.
Options that affect the behavior of the library:
--no-syscalls [default: false]
Never use syscalls. Expect some trouble with the malloc() function...
Do not trigger this option unless you know what you are doing.
Options that customize size limits:
--atexit-max=<integer> [default: 16]
Number of exit handlers that can be registered by atexit().
--rtc-callbacks=<integer> [default: 5]
Number of RTC callbacks that can be registered.
--events-queue-size=<integer> [default: 64]
Number of events simultaneously stored in the event queue.
EOF
exit 0
}
for arg; do case "$arg" in
-h | --help) help;;
--no-syscalls) conf[GINT_NO_SYSCALLS]=true;;
--atexit-max=*)
size=${arg#*=}
if [[ $size == +([0-9]) ]]; then
conf[ATEXIT_MAX]=$size
else echo "error: --atexit-max expects an integer value"
fail=true; fi;;
--rtc-callbacks=*)
size=${arg#*=}
if [[ $size == +([0-9]) ]]; then
conf[RTC_CB_ARRAY_SIZE]=$size
else echo "error: --rtc-callbacks expects an integer value"
fail=true; fi;;
--events-queue-size=*)
size=${arg#*=}
if [[ $size == +([0-9]) ]]; then
conf[EVENTS_QUEUE_SIZE]=$size
else echo "error: --events-queue-size expects an integer value"
fail=true; fi;;
--atexit-max | --rtc-callbacks | --events-queue-size)
echo "error: syntax for $arg is $arg=<integer-value>";;
*)
echo "error: unrecognized argument '$arg'"; fail=true;;
esac; done
output_config()
{
echo "-D ATEXIT_MAX=${conf[ATEXIT_MAX]}"
echo "-D RTC_CB_ARRAY_SIZE=${conf[RTC_CB_ARRAY_SIZE]}"
echo "-D EVENTS_QUEUE_SIZE=${conf[EVENTS_QUEUE_SIZE]}"
if [ "${conf[GINT_NO_SYSCALLS]}" != "" ]; then
echo "-D GINT_NO_SYSCALLS"
fi
}
if $fail; then
echo "Configuration has not been modified."
else
output_config > $output
echo "Configuration details have been output to file $output."
fi