57 lines
1.5 KiB
Bash
57 lines
1.5 KiB
Bash
function g_calc {
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unset g_calc_result
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# Use bc in backround for multiple bc's running much faster
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if [ -z "${g_bc_running}" ]
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then
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g_rnd=$$
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mkdir -p ${g_tmp}/${g_rnd}
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[ -p ${g_tmp}/${g_rnd}/bc-in ] || mkfifo ${g_tmp}/${g_rnd}/bc-in
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[ -p ${g_tmp}/${g_rnd}/bc-out ] || mkfifo ${g_tmp}/${g_rnd}/bc-out
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[ -p ${g_tmp}/${g_rnd}/bc-sed-in ] || mkfifo ${g_tmp}/${g_rnd}/bc-sed-in
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[ -p ${g_tmp}/${g_rnd}/bc-sed-out ] || mkfifo ${g_tmp}/${g_rnd}/bc-sed-out
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# bc stream channel
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{ bc -ql <${g_tmp}/${g_rnd}/bc-in 2>&1 >${g_tmp}/${g_rnd}/bc-out & } 2>/dev/null
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exec 3>${g_tmp}/${g_rnd}/bc-in 4<${g_tmp}/${g_rnd}/bc-out
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# sed stream channel
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{ sed -su 's/^\./0./; s/^-\./-0./' <${g_tmp}/${g_rnd}/bc-sed-in >${g_tmp}/${g_rnd}/bc-sed-out & } 2>/dev/null
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exec 5>${g_tmp}/${g_rnd}/bc-sed-in 6<${g_tmp}/${g_rnd}/bc-sed-out
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g_bc_running="true"
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fi
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# do bc
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echo "scale=8; $@" >&3
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local g_bc_out
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if ! read -t 0.1 g_bc_out <&4
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then
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g_traceback "$@"
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( exec 3<&- ) 2>/dev/null
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( exec 4<&- ) 2>/dev/null
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( exec 5<&- ) 2>/dev/null
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( exec 6<&- ) 2>/dev/null
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unset g_bc_running
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return 1
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fi
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# do sed
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echo ${g_bc_out} >&5
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local g_sed_out
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if ! read -t 0.1 g_sed_out <&6
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then
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g_traceback "$@"
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( exec 3<&- ) 2>/dev/null
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( exec 4<&- ) 2>/dev/null
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( exec 5<&- ) 2>/dev/null
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( exec 6<&- ) 2>/dev/null
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unset g_bc_running
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return 1
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fi
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# store result
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g_calc_result="${g_sed_out}"
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}
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