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fix-patch-lines

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executable file

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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

}