1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
#! /usr/bin/env python3
# Read #define's and translate to Python code.
# Handle #include statements.
# Handle #define macros with one argument.
# Anything that isn't recognized or doesn't translate into valid
# Python is ignored.
# Without filename arguments, acts as a filter.
# If one or more filenames are given, output is written to corresponding
# filenames in the local directory, translated to all uppercase, with
# the extension replaced by ".py".
# By passing one or more options of the form "-i regular_expression"
# you can specify additional strings to be ignored. This is useful
# e.g. to ignore casts to u_long: simply specify "-i '(u_long)'".
# XXX To do:
# - turn trailing C comments into Python comments
# - turn C Boolean operators "&& || !" into Python "and or not"
# - what to do about #if(def)?
# - what to do about macros with multiple parameters?
import sys, re, getopt, os
p_define = re.compile('^[\t ]*#[\t ]*define[\t ]+([a-zA-Z0-9_]+)[\t ]+')
p_macro = re.compile(
'^[\t ]*#[\t ]*define[\t ]+'
'([a-zA-Z0-9_]+)\(([_a-zA-Z][_a-zA-Z0-9]*)\)[\t ]+')
p_include = re.compile('^[\t ]*#[\t ]*include[\t ]+<([^>\n]+)>')
p_comment = re.compile(r'/\*([^*]+|\*+[^/])*(\*+/)?')
p_cpp_comment = re.compile('//.*')
ignores = [p_comment, p_cpp_comment]
p_char = re.compile(r"'(\\.[^\\]*|[^\\])'")
p_hex = re.compile(r"0x([0-9a-fA-F]+)L?")
filedict = {}
importable = {}
try:
searchdirs=os.environ['include'].split(';')
except KeyError:
try:
searchdirs=os.environ['INCLUDE'].split(';')
except KeyError:
searchdirs=['/usr/include']
try:
searchdirs.insert(0, os.path.join('/usr/include',
os.environ['MULTIARCH']))
except KeyError:
pass
def main():
global filedict
opts, args = getopt.getopt(sys.argv[1:], 'i:')
for o, a in opts:
if o == '-i':
ignores.append(re.compile(a))
if not args:
args = ['-']
for filename in args:
if filename == '-':
sys.stdout.write('# Generated by h2py from stdin\n')
process(sys.stdin, sys.stdout)
else:
fp = open(filename, 'r')
outfile = os.path.basename(filename)
i = outfile.rfind('.')
if i > 0: outfile = outfile[:i]
modname = outfile.upper()
outfile = modname + '.py'
outfp = open(outfile, 'w')
outfp.write('# Generated by h2py from %s\n' % filename)
filedict = {}
for dir in searchdirs:
if filename[:len(dir)] == dir:
filedict[filename[len(dir)+1:]] = None # no '/' trailing
importable[filename[len(dir)+1:]] = modname
break
process(fp, outfp)
outfp.close()
fp.close()
def pytify(body):
# replace ignored patterns by spaces
for p in ignores:
body = p.sub(' ', body)
# replace char literals by ord(...)
body = p_char.sub("ord('\\1')", body)
# Compute negative hexadecimal constants
start = 0
UMAX = 2*(sys.maxsize+1)
while 1:
m = p_hex.search(body, start)
if not m: break
s,e = m.span()
val = int(body[slice(*m.span(1))], 16)
if val > sys.maxsize:
val -= UMAX
body = body[:s] + "(" + str(val) + ")" + body[e:]
start = s + 1
return body
def process(fp, outfp, env = {}):
lineno = 0
while 1:
line = fp.readline()
if not line: break
lineno = lineno + 1
match = p_define.match(line)
if match:
# gobble up continuation lines
while line[-2:] == '\\\n':
nextline = fp.readline()
if not nextline: break
lineno = lineno + 1
line = line + nextline
name = match.group(1)
body = line[match.end():]
body = pytify(body)
ok = 0
stmt = '%s = %s\n' % (name, body.strip())
try:
exec(stmt, env)
except:
sys.stderr.write('Skipping: %s' % stmt)
else:
outfp.write(stmt)
match = p_macro.match(line)
if match:
macro, arg = match.group(1, 2)
body = line[match.end():]
body = pytify(body)
stmt = 'def %s(%s): return %s\n' % (macro, arg, body)
try:
exec(stmt, env)
except:
sys.stderr.write('Skipping: %s' % stmt)
else:
outfp.write(stmt)
match = p_include.match(line)
if match:
regs = match.regs
a, b = regs[1]
filename = line[a:b]
if filename in importable:
outfp.write('from %s import *\n' % importable[filename])
elif filename not in filedict:
filedict[filename] = None
inclfp = None
for dir in searchdirs:
try:
inclfp = open(dir + '/' + filename)
break
except IOError:
pass
if inclfp:
outfp.write(
'\n# Included from %s\n' % filename)
process(inclfp, outfp, env)
else:
sys.stderr.write('Warning - could not find file %s\n' %
filename)
if __name__ == '__main__':
main()
|
