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Remove head -c for cut, as head -c is not POSIX-compliant

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`tail -c` is however. Since we used `head -c-`, to cut off characters from the
end, the POSIX-compliant `wc -c` is used for a `strlen` we can proceed to do
the necessary arithmetic off of.

Credit to @PlasmaPower for identifying this non-compliant behavior which
necessitated this fix in response.
This commit is contained in:
Luke Parker
2025-12-09 00:21:33 -05:00
parent d881421e7e
commit af085ba9c1
1 changed files with 8 additions and 4 deletions
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12
orchestration/increase_default_stack_size.sh
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@@ -33,7 +33,7 @@ write_bytes() {
POS=$1
BYTES=$2
while [ ! "$BYTES" = "" ]; do
NEXT=$(printf "%s" "$BYTES" | head -c2)
NEXT=$(printf "%s" "$BYTES" | cut -c-2)
# Advance to the third byte, as in, after the first two bytes
BYTES=$(printf "%s" "$BYTES" | tail -c+3)
@@ -106,9 +106,13 @@ swap_native_endian() {
return
fi
while [ ! "$BYTES" = "" ]; do
while :; do
printf "%s" "$BYTES" | tail -c2
BYTES=$(printf "%s" "$BYTES" | head -c-2)
NEW_LENGTH=$(( $(printf "%s" "$BYTES" | wc -c) - 2 ))
if [ "$NEW_LENGTH" -eq 0 ]; then
break
fi
BYTES=$(printf "%s" "$BYTES" | cut -c-$NEW_LENGTH)
done
}
@@ -149,7 +153,7 @@ while [ "$NEXT_PROGRAM_HEADER" -ne -1 ]; do
NEXT_PROGRAM_HEADER=$(( NEXT_PROGRAM_HEADER - 1 ))
PROGRAM_HEADER=$(read_program_header "$THIS_PROGRAM_HEADER")
HEADER_TYPE=$(printf "%s" "$PROGRAM_HEADER" | head -c8)
HEADER_TYPE=$(printf "%s" "$PROGRAM_HEADER" | cut -c-8)
HEADER_TYPE=$(swap_native_endian "$HEADER_TYPE")
# `PT_GNU_STACK`
# https://github.com/torvalds/linux/blob/c2f2b01b74be8b40a2173372bcd770723f87e7b2/include/uapi/linux/elf.h#L41