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Subject#pragma once
Following up with negative LOC trend...

16171 files changed, 16197 insertions(+), 87671 deletions(-)

Not all files can be blindly converted as some headers check for master
header include guard (spinlock.h et al).

include/uapi/ can be skipped probably out of fear of finding a C compiler
without "#pragma once" support.

Script modifies files in place and gives up if something goes wrong even
slightly.

Use "#pragma once" in you code today!


#!/usr/bin/python2
# Change include guard to "#pragma once" directive in place.
import os
import re
import sys

re_ifndef = re.compile('#ifndef ([A-Za-z_][A-Za-z0-9_]*)\n')
re_define = re.compile('#define ([A-Za-z_][A-Za-z0-9_]*)\n')
re_endif = re.compile('#endif([ \t]*/\*[^/]*\*/[ \t]*)?\n')

def read_file(filename):
with open(filename) as f:
buf = f.read()
return buf

def write_file(filename, buf, chop_list):
# [start, end)
s1, e1 = chop_list[0]
s2, e2 = chop_list[1]

tmp = '%s.pragma-once' % filename
with open(tmp, 'w') as f:
f.write(buf[0:s1])
if s1 > 0 and buf[s1 - 1] != '\n':
f.write('\n')
f.write('#pragma once\n')
f.write(buf[e1:s2])
if buf[s2 - 1] != '\n':
f.write('\n')

os.rename(tmp, filename)

def ws(c):
return c == '\n' or c == ' ' or c == '\t'

def pragma_once(filename):
c = read_file(filename)

chop_list = []

i = 0
j = len(c)
while i < j:
if ws(c[i]):
i = i + 1
elif c[i] == '/' and c[i + 1] == '/':
i = c.index('\n', i + 2) + 1
elif c[i] == '/' and c[i + 1] == '*':
i = c.index('*/', i + 2) + 2
else:
break

ii = i;
#ifndef
match = re_ifndef.match(c, ii)
if match is None:
return
guard = match.group(1)
ii = match.end()

#define
match = re_define.match(c, ii)
if match is None:
return
if guard != match.group(1):
return
ii = match.end()

while i > 0 and ws(c[i - 1]):
i = i - 1
while ws(c[ii]):
ii = ii + 1

chop_list.append((i, ii))

#endif
ii = c.rindex("\n#endif", i) + 1
match = re_endif.match(c, ii)
if match is None:
return
jj = match.end()
if jj != len(c):
return

while ws(c[ii - 1]):
ii = ii - 1

chop_list.append((ii, len(c)))

write_file(filename, c, chop_list)

for filename in sys.argv[1:]:
try:
pragma_once(filename)
except:
pass

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