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#!/usr/bin/awk -f
# SPDX-License-Identifier: GPL-2.0
#
# Use #line directives to preserve original __LINE__ numbers across patches to
# avoid unwanted compilation changes.
BEGIN {
in_hunk = 0
skip = 0
}
/^--- / {
skip = $2 !~ /\.(c|h)$/
print
next
}
/^@@/ {
if (skip) {
print
next
}
in_hunk = 1
# @@ -1,3 +1,4 @@:
# 1: line number in old file
# 3: how many lines the hunk covers in old file
# 1: line number in new file
# 4: how many lines the hunk covers in new file
match($0, /^@@ -([0-9]+)(,([0-9]+))? \+([0-9]+)(,([0-9]+))? @@/, m)
# Set 'cur' to the old file's line number at the start of the hunk. It
# gets incremented for every context line and every line removal, so
# that it always represents the old file's current line number.
cur = m[1]
# last = last line number of current hunk
last = cur + (m[3] ? m[3] : 1) - 1
need_line_directive = 0
print
next
}
{
if (skip || !in_hunk || $0 ~ /^\\ No newline at end of file/) {
print
next
}
# change line
if ($0 ~ /^[+-]/) {
# inject #line after this group of changes
need_line_directive = 1
if ($0 ~ /^-/)
cur++
print
next
}
# If this is the first context line after a group of changes, inject
# the #line directive to force the compiler to correct the line
# numbering to match the original file.
if (need_line_directive) {
print "+#line " cur
need_line_directive = 0
}
if (cur == last)
in_hunk = 0
cur++
print
}
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