rc/sh/disf

#!/usr/bin/env sh
# disassembles a function given its symbolic name.
# YES_ZSH
# YES_BASH
# YES_DASH

# TODO: actually test that this works with dash.

disf() { ### @-
    ### disassemble a single function from an unstripped executable, unreliably.
    [ $# -le 2 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
    local exe="${1:?first argument should be an unstripped executable}"
    local symbol="${2:?second argument should be a function name}"
    # note: relies on GNU sed: https://unix.stackexchange.com/a/78485
    objdump -d -C --no-show-raw-insn "$exe" | sed '/<'"$symbol"'>:/,/^$/!d;//d'
}

[ -n "${preload+-}" ] || disf "$@"